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diff --git a/.gitignore b/.gitignore
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--- a/dev/null
+++ b/.gitignore
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+/ABOUT-NLS
+/ABOUT-NLS~
+*.a
+*.la
+*.lo
+*.o
+*.tar.*
+*~
+.bootstrap
+.deps
+.emacs*
+.gdbinit
+.libs
+ABOUT-NLS
+ChangeLog
+INSTALL
+Makefile
+Makefile.in
+TAGS
+aclocal.m4
+autom4te.cache/
+config.h
+config.h.in
+config.log
+config.status
+configure
+core
+gnu
+m4
+stamp-h1
+autoscan.log
+compile
+depcomp
+install-sh
+missing
+ylwrap
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..fea8f96
--- a/dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "grecs"]
+	path = grecs
+	url = git://git.gnu.org.ua/grecs.git
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..94a9ed0
--- a/dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
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+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..31e9e5f
--- a/dev/null
+++ b/Makefile.am
@@ -0,0 +1 @@
+SUBDIRS = grecs src
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..764cddc
--- a/dev/null
+++ b/configure.ac
@@ -0,0 +1,35 @@
+#                                               -*- Autoconf -*-
+# Process this file with autoconf to produce a configure script.
+
+AC_PREREQ([2.69])
+AC_INIT([genrc], [0.1], [gray@gnu.org])
+AC_CONFIG_SRCDIR([src/genrc.c])
+AC_CONFIG_HEADERS([config.h])
+AM_INIT_AUTOMAKE([1.11 foreign silent-rules])
+AC_CONFIG_MACRO_DIR(grecs/am)
+
+# Enable silent rules by default
+AM_SILENT_RULES([yes])
+
+# Checks for programs.
+AC_PROG_CC
+AC_PROG_RANLIB
+
+# Checks for libraries.
+AC_CHECK_LIB(pcre, main)
+
+# Checks for header files.
+AC_CHECK_HEADERS([getopt.h pcre.h])
+
+# Checks for library functions.
+AC_CHECK_FUNCS([getdtablesize])
+
+GRECS_SETUP(grecs, [all-parsers git2chg])
+
+AM_CONDITIONAL([COND_PCRE],
+  [test "$ac_cv_header_pcre_h" = yes && test "$ac_cv_lib_pcre_main" = yes])
+
+AC_CONFIG_FILES([Makefile
+                 src/Makefile])
+
+AC_OUTPUT
diff --git a/grecs b/grecs
new file mode 160000
+Subproject 27ca9f5819d0e44173a5f61a241cd066ad15713
diff --git a/src/.gitignore b/src/.gitignore
new file mode 100644
index 0000000..3d36647
--- a/dev/null
+++ b/src/.gitignore
@@ -0,0 +1 @@
+genrc
diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..fe24f3e
--- a/dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,32 @@
+bin_PROGRAMS = genrc
+genrc_SOURCES = \
+ genrc.c\
+ genrc.h\
+ err.c\
+ pidfrom.c\
+ pid_file.c\
+ pid_config.c\
+ pid_grep.c\
+ pid_proc.c\
+ pid_ps.c\
+ pidlist.c\
+ procscan.c\
+ com_status.c\
+ com_start.c\
+ com_stop.c\
+ com_restart.c\
+ com_reload.c\
+ transform.c\
+ match_exact.c\
+ match_glob.c\
+ match_regex.c\
+ sentinel.c
+
+AM_CPPFLAGS = @GRECS_INCLUDES@
+LDADD = @GRECS_LDADD@
+
+if COND_PCRE
+ genrc_SOURCES += match_pcre.c
+ AM_CPPFLAGS += -DHAVE_PCRE=1
+endif
+
diff --git a/src/com_reload.c b/src/com_reload.c
new file mode 100644
index 0000000..7ff1206
--- a/dev/null
+++ b/src/com_reload.c
@@ -0,0 +1,17 @@
+#include "genrc.h"
+
+int
+com_reload(void)
+{
+	PIDLIST pids;
+	
+	if (genrc_no_reload)
+		return com_restart();
+	pidlist_init(&pids);
+	if (get_pid_list(genrc_pid_closure, &pids))
+		return 1;
+	pidlist_kill(&pids, genrc_signal_reload);
+	return 0;
+}
+
+	
diff --git a/src/com_restart.c b/src/com_restart.c
new file mode 100644
index 0000000..b3588a1
--- a/dev/null
+++ b/src/com_restart.c
@@ -0,0 +1,12 @@
+#include "genrc.h"
+
+int
+com_restart(void)
+{
+	int rc;
+	rc = com_stop();
+	if (rc == 0)
+		rc = com_start();
+	return rc;
+}
+	
diff --git a/src/com_start.c b/src/com_start.c
new file mode 100644
index 0000000..73bb2ec
--- a/dev/null
+++ b/src/com_start.c
@@ -0,0 +1,121 @@
+#include "genrc.h"
+
+void
+report_exec_error(int rc, char const *program)
+{
+	if (WIFEXITED(rc)) {
+		if (WEXITSTATUS(rc)) {
+			genrc_error("%s exited with status %d",
+				    program, WEXITSTATUS(rc));
+		}
+	} else if (WIFSIGNALED(rc)) {
+		char const *coremsg = "";
+#ifdef WCOREDUMP
+		if (WCOREDUMP(rc))
+			coremsg = " (core dumped)";
+#endif
+		genrc_error("%s terminated on signal %d%s",
+			    program, WTERMSIG(rc), coremsg);
+	} else if (WIFSTOPPED(rc)) {
+		genrc_error("%s stopped on signal %d",
+			    program, WSTOPSIG(rc));
+	} else {
+		genrc_error("%s terminated with unrecognized status: %d",
+			    program, rc);
+	}
+}
+
+typedef void (*SIGHANDLER)(int);
+
+void
+sigchld(int sig)
+{
+}
+
+int
+timedwaitpid(pid_t pid, int *status)
+{
+	struct timeval now, stoptime, ttw;
+	int rc = -1;
+	SIGHANDLER oldsig;
+	
+	oldsig = signal(SIGCHLD, sigchld);
+	gettimeofday(&stoptime, NULL);
+	stoptime.tv_sec += genrc_timeout;
+	while (1) {
+		pid_t p;
+		
+		p = waitpid(pid, status, WNOHANG);
+		if (p == pid) {
+			rc = 0;
+			break;
+		}
+		if (p < 0 && errno != EINTR) {
+			system_error(errno, "waitpid");
+			break;
+		}
+
+		gettimeofday(&now, NULL);
+		if (timercmp(&now, &stoptime, >=))
+			break;
+		timersub(&stoptime, &now, &ttw);
+		if (select(0, NULL, NULL, NULL, &ttw) < 0) {
+			if (errno != EINTR) {
+				system_error(errno, "select");
+				break;
+			}
+		}
+
+	}
+	signal(SIGCHLD, oldsig);
+	if (rc) {
+		kill(pid, SIGKILL);
+	}
+	return rc;
+}
+
+int
+com_start(void)
+{
+	pid_t pid;
+	int status;
+	PIDLIST pids;
+	char *p;
+	
+	pidlist_init(&pids);
+	if (get_pid_list(genrc_pid_closure, &pids) == 0) {
+		int running = pids.pidc > 0;
+		pidlist_free(&pids);
+		if (running) {
+			genrc_error("%s is already running", genrc_program);
+			return 1;
+		}
+	}
+
+	if ((p = getenv("GENRC_SENTINEL")) && *p == '1')
+		return sentinel();
+	
+	pid = fork();
+	if (pid == -1) {
+		system_error(errno, "fork");
+		return 1;
+	}
+	if (pid == 0) {
+		char *argv[] = { SHELL, "-c", NULL, NULL };
+		argv[2] = genrc_command;
+		execvp(SHELL, argv);
+		system_error(errno, "failed to exec %s", genrc_program);
+		exit(127);
+	}
+
+	if (timedwaitpid(pid, &status)) {
+		genrc_error("timed out waiting for %s to return",
+			    genrc_program);
+		return 1;
+	}
+	if (!(WIFEXITED(status) && WEXITSTATUS(status) == 0)) {
+		report_exec_error(status, genrc_program);
+		return 1;
+	}
+	return 0;
+}
diff --git a/src/com_status.c b/src/com_status.c
new file mode 100644
index 0000000..f68c6ef
--- a/dev/null
+++ b/src/com_status.c
@@ -0,0 +1,38 @@
+#include "genrc.h"
+
+int
+com_status(void)
+{
+	PIDLIST pids;
+	int rc;
+
+	pidlist_init(&pids);
+	rc = get_pid_list(genrc_pid_closure, &pids);
+	if (rc == 0) {
+		if (pids.pidc == 0)
+			printf("%s is not running\n", genrc_program);
+		else {
+			printf("%s is running ", genrc_program);
+			if (pids.pidc == 1) {
+				printf("(pid %lu)",
+				       (unsigned long) pids.pidv[0]);
+			} else {
+				int i;
+				int delim = ' ';
+				printf("(pids");
+				for (i = 0; i < pids.pidc; i++) {
+					printf("%c%lu", delim,
+					       (unsigned long) pids.pidv[i]);
+					delim = ',';
+				}
+				putchar(')');
+			}
+			putchar('\n');
+		}	
+	} else {
+		printf("status unknown\n");
+	}
+	return 0;
+}
+
+			
diff --git a/src/com_stop.c b/src/com_stop.c
new file mode 100644
index 0000000..5227358
--- a/dev/null
+++ b/src/com_stop.c
@@ -0,0 +1,66 @@
+#include "genrc.h"
+
+static void
+timermul(struct timeval *a, int b)
+{
+	a->tv_sec *= b;
+	a->tv_usec *= b;
+	a->tv_sec = a->tv_sec + a->tv_usec / 1000000;
+	a->tv_usec %= 1000000;
+}
+
+#define MIN_POLL_TTW 20000
+
+int
+com_stop(void)
+{
+	PIDLIST pids;
+	struct timeval stoptime, before, after, ttw, maxttw;
+	int ratio;
+	
+	pidlist_init(&pids);	
+	if (get_pid_list(genrc_pid_closure, &pids)) {
+		genrc_error("program status unknown");
+		return 1;
+	}
+
+	if (pids.pidc == 0) {
+		genrc_error("%s not running", genrc_program);
+		return 1;
+	}
+
+	gettimeofday(&stoptime, NULL);
+	stoptime.tv_sec += genrc_timeout;
+	ratio = 1;
+	while (pids.pidc) {
+		gettimeofday(&before, NULL);
+		if (timercmp(&before, &stoptime, >)) 
+			break;
+		pidlist_kill(&pids, genrc_signal_stop);
+		if (get_pid_list(genrc_pid_closure, &pids))
+			break;
+		if (pids.pidc == 0)
+			return 0;
+		gettimeofday(&after, NULL);
+		if (timercmp(&after, &stoptime, >=))
+			break;
+		if (ratio < 10)
+			++ratio;
+		timersub(&stoptime, &after, &maxttw);
+		timersub(&after, &before, &ttw);
+		timermul(&ttw, ratio);
+		if (ttw.tv_sec < 0 || ttw.tv_usec < 0)
+			ttw.tv_sec = ttw.tv_usec = 0;
+		if (timercmp(&ttw, &maxttw, >))
+			ttw = maxttw;
+		if (ttw.tv_sec == 0 && ttw.tv_usec < MIN_POLL_TTW)
+			ttw.tv_usec = MIN_POLL_TTW;
+		if (select(0, NULL, NULL, NULL, &ttw) < 0 && errno != EINTR) {
+			system_error(errno, "select");
+			break;
+		}
+	}
+	return 1;
+}
+	
+
diff --git a/src/err.c b/src/err.c
new file mode 100644
index 0000000..539a7b8
--- a/dev/null
+++ b/src/err.c
@@ -0,0 +1,47 @@
+#include "genrc.h"
+
+char *progname = "genrc";
+
+void
+setprogname(char const *s)
+{
+	progname = xstrdup(s);
+}
+
+void
+genrc_error(char const *fmt, ...)
+{
+	va_list ap;
+	fprintf(stderr, "%s: ", progname);
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	fputc('\n', stderr);
+}
+
+void
+usage_error(char const *fmt, ...)
+{
+	va_list ap;
+	fprintf(stderr, "%s: ", progname);
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	fputc('\n', stderr);
+	exit(1);
+}
+
+void
+system_error(int ec, char const *fmt, ...)
+{
+	va_list ap;
+	fprintf(stderr, "%s: ", progname);
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	fprintf(stderr, ": %s\n", strerror(ec));
+}
+
+	
+	
+		
diff --git a/src/genrc.c b/src/genrc.c
new file mode 100644
index 0000000..64dd81a
--- a/dev/null
+++ b/src/genrc.c
@@ -0,0 +1,469 @@
+#include "genrc.h"
+#include <sys/ioctl.h>
+
+char *genrc_command;
+char *genrc_program;
+char *genrc_pid_from;
+unsigned genrc_timeout = 5;
+int genrc_no_reload;
+int genrc_signal_stop = SIGTERM;
+int genrc_signal_reload = SIGHUP;
+GENRC_PID_CLOSURE *genrc_pid_closure;
+char *genrc_pidfile;
+
+
+enum {
+	OPT_USAGE = 256,
+	OPT_VERSION,
+	OPT_SIGNAL_RELOAD,
+	OPT_NO_RELOAD,
+	OPT_SIGNAL_STOP
+};
+
+struct option longopts[] = {
+	{ "help",           no_argument,       0, 'h' },
+	{ "usage",          no_argument,       0, OPT_USAGE },
+	{ "command",        required_argument, 0, 'c' },
+	{ "program",        required_argument, 0, 'p' },
+	{ "pid-from",       required_argument, 0, 'P' },
+	{ "pidfile",        required_argument, 0, 'F' },
+	{ "timeout",        required_argument, 0, 't' },
+	{ "signal-reload",  required_argument, 0, OPT_SIGNAL_RELOAD },
+	{ "no-reload",      no_argument,       0, OPT_NO_RELOAD },
+	{ "signal-stop",    required_argument, 0, OPT_SIGNAL_STOP },
+	{ "sentinel",       no_argument,       0, 'S' },
+	{ "version",        no_argument,       0, OPT_VERSION },
+	{ NULL }
+};
+char shortopts[] = "c:hF:P:p:St:";
+
+struct sigdefn {
+	char const *sig_name;
+	int sig_no;
+};
+
+#define S(s) { #s, s }	
+static struct sigdefn sigdefn[] = {
+  S (SIGHUP),
+  S (SIGINT),
+  S (SIGQUIT),
+  S (SIGILL),
+  S (SIGTRAP),
+  S (SIGABRT),
+  S (SIGIOT),
+  S (SIGBUS),
+  S (SIGFPE),
+  S (SIGKILL),
+  S (SIGUSR1),
+  S (SIGSEGV),
+  S (SIGUSR2),
+  S (SIGPIPE),
+  S (SIGALRM),
+  S (SIGTERM),
+#ifdef SIGSTKFLT
+  S (SIGSTKFLT),
+#endif
+  S (SIGCHLD),
+  S (SIGCONT),
+  S (SIGSTOP),
+  S (SIGTSTP),
+  S (SIGTTIN),
+  S (SIGTTOU),
+#ifdef SIGURG
+  S (SIGURG),
+#endif
+#ifdef SIGXCPU
+  S (SIGXCPU),
+#endif
+#ifdef SIGXFSZ
+  S (SIGXFSZ),
+#endif
+#ifdef SIGVTALRM
+  S (SIGVTALRM),
+#endif
+#ifdef SIGPROF
+  S (SIGPROF),
+#endif
+#ifdef SIGWINCH
+  S (SIGWINCH),
+#endif
+#ifdef SIGPOLL
+  S (SIGPOLL),
+#endif
+#ifdef SIGIO
+  S (SIGIO),
+#endif
+#ifdef SIGPWR
+  S (SIGPWR),
+#endif
+#ifdef SIGSYS
+  S (SIGSYS),
+#endif
+  {NULL}
+};
+#undef S
+
+static int
+is_numeric_str(char const *s)
+{
+	while (*s) {
+		if (!isdigit(*s))
+			return 0;
+		s++;
+	}
+	return 1;
+}
+
+int
+sig_name_to_str(char const *s)
+{
+	if (is_numeric_str(s)) {
+		char *end;
+		unsigned long n;
+		errno = 0;
+		n = strtoul(s, &end, 10);
+		if (errno || *end || n > UINT_MAX)
+			return -1;
+		return n;
+	} else {
+		struct sigdefn *sd;
+
+		for (sd = sigdefn; sd->sig_name; sd++) {
+			if (s[0] == 's' || s[0] == 'S') {
+				if (strcasecmp(sd->sig_name, s) == 0)
+					return sd->sig_no;
+			} else if (strcasecmp(sd->sig_name + 3, s) == 0)
+				return sd->sig_no;
+		}
+	}
+	return -1;
+}
+
+char const *help_msg[] = {
+	"Usage: genrc [OPTIONS] COMMAND",
+	"generic rc program\n",
+	"COMMANDs are:\n",
+	"  start                    start the program",
+	"  stop                     stop the program",
+	"  restart                  restart the running program",
+	"  reload                   send a reload signal to the program",
+	"  status                   display the program status",
+	"",
+	"OPTIONs are:\n",
+	"  -h, --help               display this help list",
+	"      --usage              display short usage information",
+	"  -c, --command=COMMAND    command line to run",
+	"  -p, --program=PROGRAM    name of the program to run",
+	"  -P, --pid-from=SOURCE    where to look for PIDs of the running programs",
+	"  -F, --pidfile=NAME       name of the PID file",
+	"                           (same as --pid-from=FILE:NAME)",
+	"  -t, --timeout=SECONDS    time to wait for the program to start up or",
+	"                           terminate",
+	"      --signal-reload=SIG  signal to send on reload (default: SIGHUP)",
+	"                           setting to 0 is equivalent to --no-reload",
+	"      --no-reload          makes reload equivalent to restart",
+	"      --signal-stop=SIG    signal to send in order to terminate the program",
+	"                           (default: SIGTERM)",
+	"      --sentinel           PROGRAM runs in foreground; disconnect from the",
+	"                           controlling terminal, run it and act as a sentinel",
+	"      --version            display program version and exist",
+	"",
+	"Influential environment variables and corresponding options:",
+	"",
+	"   GENRC_COMMAND=COMMAND  --command=COMMAND",
+	"   GENRC_PROGRAM=NAME     --program=NAME",
+	"   GENRC_PID_FROM=SOURCE  --pid-from=SOURCE",
+	"   GENRC_TIMEOUT=SECONDS  --timeout=SECONDS",
+	"   GENRC_SENTINEL=1       --sentinel",
+	"",
+	"   At least one of COMMAND or PROGRAM must be given.",
+	"   If PROGRAM is supplied, but COMMAND is not, COMMAND is set to PROGRAM",
+	"   Otherwise, if COMMAND is set, but PROGRAM is not, PROGRAM is set to the",
+	"   first word (in the shell sense) in COMMAND.",
+	"",
+	"PID sources:",
+	"",
+	"   FILE:<NAME>",
+	"      Read PID from the file <NAME>",
+	"",
+	"   CONFIG:<LANG>:<FILENAME>:<FQRN>",
+	"      Name of the PID file is stored in relation <FQRN> of the configuration",
+	"      file <FILENAME>, written in language <LANG>",
+	"",
+	"   GREP:<FILE>:s/<RX>/<REPL>/[<FLAGS>][;...]",
+	"      Grep for the first line in <FILE> that matches <RX>. If found, process",
+	"      replace the matched portion according to <REPL> and <FLAGS>. Use",
+	"      the resulting string as PID. More sed expressions can be supplied",
+	"      separated with semicolons.",
+	"",
+	"   PROC[:[<EXE>][:<FLAGS>]]",
+	"      Look for matching program in /proc/<PID>/*. If <EXE> is not supplied",
+	"      or empty, program name from --program will be used. <FLAGS> are:",
+	"        e  exact match",
+	"        g  glob pattern match",
+	"        x  extended POSIX regexp match (default)",
+	"        p  PCRE match",
+	"        i  case-insensitive match",
+	"",
+	"        c  match entire command line",
+        "        r  match real executable name (instead of argv0)",
+	"        a  signal all matching PIDs",
+	"",
+	"   PS:[:[<EXE>][:<FLAGS>]]",
+	"      Look for matching program in the output of 'ps -ef'. <EXE> and <FLAGS>",
+	"      as described above",
+	"",
+	NULL
+};
+
+void
+help(void)
+{
+	int i;
+
+	for (i = 0; help_msg[i]; i++)
+		puts(help_msg[i]);
+}
+
+char const *usage_msg[] = {
+	"genrc",
+	"[-h]",
+	"[-F PIDFILE]",
+	"[-P SOURCE]",
+	"[-c COMMAND]",
+	"[-p PROGRAM]",
+	"[-t SECONDS]",
+	"[--command=COMMAND]",
+	"[--help]",
+	"[--no-reload]",
+	"[--pid-from=SOURCE]",
+	"[--pidfile=PIDFILE]",
+	"[--program=PROGRAM]",
+	"[--sentinel]",
+	"[--signal-reload=SIG]",
+	"[--signal-stop=SIG]",
+	"[--timeout=SECONDS]",
+	"[--usage]",
+	"{",
+	"start",
+	"|",
+	"stop",
+	"|",
+	"restart",
+	"|",
+	"reload",
+	"|",
+	"status",
+	"}",
+	NULL
+};
+
+static int
+screen_width(void)
+{
+	struct winsize ws;
+	ws.ws_col = ws.ws_row = 0;
+	if ((ioctl(1, TIOCGWINSZ, (char *) &ws) < 0) || ws.ws_col == 0) {
+		char *p = getenv("COLUMNS");
+		if (p)
+			ws.ws_col = atoi(p);
+		if (ws.ws_col == 0)
+			ws.ws_col = 80;
+	}
+	return ws.ws_col;
+}
+
+void
+usage(void)
+{
+	int i, j, pos = 0;
+	int width = screen_width();
+	if (width > 4)
+		width -= 4;
+	for (i = j = 0; usage_msg[i]; i++) {
+		int len = strlen(usage_msg[i]);
+		if (j > 0)
+			len++;
+		if (pos + len > width) {
+			putchar('\n');
+			pos = strlen(usage_msg[0]) + 1;
+			printf("%*s", pos, "");
+			j = 0;
+		} else if (j > 0)
+			putchar(' ');
+		j++;
+		printf("%s", usage_msg[i]);
+		pos += len;
+	}
+	putchar('\n');
+}
+
+static const char gplv3[] =
+	"License GPLv3+: GNU GPL version 3 or later "
+	"<http://gnu.org/licenses/gpl.html>\n"
+	"This is free software: you are free to change and redistribute it.\n"
+	"There is NO WARRANTY, to the extent permitted by law.\n\n";
+
+void
+version(void)
+{
+	printf("%s\n", PACKAGE_STRING);
+	printf("Copyryght (C) 2018 Sergey Poznyakoff\n");
+	printf("%s", gplv3);
+}
+
+
+typedef int (*GENRC_COMMAND)(void);
+
+struct comtab {
+	char const *com_name;
+	GENRC_COMMAND com_fun;
+};
+
+static struct comtab comtab[] = {
+	{ "start",   com_start },
+	{ "stop",    com_stop },
+	{ "restart", com_restart },
+	{ "reload",  com_reload },
+	{ "status",  com_status },
+	{ NULL, NULL }
+};
+
+GENRC_COMMAND
+find_command(char const *s)
+{
+	struct comtab *c;
+	for (c = comtab; c->com_name; c++)
+		if (strcmp(c->com_name, s) == 0)
+			break;
+	return c->com_fun;
+}	
+
+int
+main(int argc, char **argv)
+{
+	int c;
+	char *p;
+	int no_reload = 0;
+	GENRC_COMMAND command;
+		
+	setprogname(argv[0]);
+	
+	while ((c = getopt_long(argc, argv, shortopts, longopts, NULL))
+	       != EOF) {
+		switch (c) {
+		case 'h':
+			help();
+			exit(0);
+		case OPT_USAGE:
+			usage();
+			exit(0);
+		case OPT_VERSION:
+			version();
+			exit(0);
+		case 'c':
+			setenv("GENRC_COMMAND", optarg, 1);
+			break;
+		case 'p':
+			setenv("GENRC_PROGRAM", optarg, 1);
+			break;
+		case 'P':
+			setenv("GENRC_PID_FROM", optarg, 1);
+			break;
+		case 'F':
+			genrc_pidfile = optarg;
+			p = xmalloc(6 + strlen(optarg));
+			strcat(strcpy(p, "FILE:"), optarg);
+			setenv("GENRC_PID_FROM", p, 1);
+			free(p);
+			break;
+		case 't':
+			setenv("GENRC_TIMEOUT", optarg, 1);
+			break;
+		case 'S':
+			setenv("GENRC_SENTINEL", "1", 1);
+			break;
+		case OPT_NO_RELOAD:
+			no_reload = 1;
+			break;
+		case OPT_SIGNAL_RELOAD:
+			setenv("GENRC_SIGNAL_RELOAD", optarg, 1);
+			break;
+		case OPT_SIGNAL_STOP:
+			setenv("GENRC_SIGNAL_STOP", optarg, 1);
+			break;
+		default:
+			exit(1);
+		}
+	}
+
+	if ((p = getenv("GENRC_COMMAND")) != NULL)
+		genrc_command = p;
+	if ((p = getenv("GENRC_PROGRAM")) != NULL)
+		genrc_program = p;
+
+	if (no_reload)
+		genrc_no_reload = 1;
+	else if ((p = getenv("GENRC_SIGNAL_RELOAD")) != NULL) {
+		genrc_signal_reload = sig_name_to_str(p);
+		if (genrc_signal_reload == -1)
+			usage_error("%s: invalid signal number", p);
+		else if (genrc_signal_reload == 0)
+			genrc_no_reload = 1;
+	}
+
+	if ((p = getenv("GENRC_SIGNAL_STOP")) != NULL) {
+		genrc_signal_stop = sig_name_to_str(p);
+		if (genrc_signal_stop <= 0)
+			usage_error("%s: invalid signal number", p);
+	}
+
+	if ((p = getenv("GENRC_TIMEOUT")) != NULL) {
+		char *end;
+		unsigned long n;
+		errno = 0;
+		n = strtoul(p, &end, 10);
+		if (errno || *p || n > UINT_MAX)
+			usage_error("%s: invalid timeout", p);
+		if (n == 0)
+			genrc_no_reload = 1;
+		else
+			genrc_timeout = n;
+	}
+		
+	if (!genrc_command) {
+		if (genrc_program) {
+			genrc_command = xstrdup(genrc_program);
+		} else {
+			usage_error("either --command (GENRC_COMMAND) or --program (GENRC_PROGRAM) must be given");
+		}
+	} else if (!genrc_program) {
+		struct wordsplit ws;
+		ws.ws_error = genrc_error;
+		if (wordsplit(genrc_command, &ws,
+			      WRDSF_NOCMD|WRDSF_NOVAR|
+			      WRDSF_ENOMEMABRT|WRDSF_SHOWERR|WRDSF_ERROR))
+			exit(1);
+		genrc_program = xstrdup(ws.ws_wordv[0]);
+		wordsplit_free(&ws);
+	}
+
+	if ((p = getenv("GENRC_PID_FROM")) != NULL) {
+		genrc_pid_closure = get_pid_closure(p);
+	} else {
+		genrc_pid_closure = get_pid_closure("PROC");
+	}
+
+	argc -= optind;
+	if (argc == 0)
+		usage_error("missing command verb");
+	if (argc > 1)
+		usage_error("too many arguments");
+	argv += optind;
+
+	command = find_command(argv[0]);
+	if (!command)
+		usage_error("unrecognized command: %s", argv[0]);
+	exit(command());
+}
+
diff --git a/src/genrc.h b/src/genrc.h
new file mode 100644
index 0000000..f782fd5
--- a/dev/null
+++ b/src/genrc.h
@@ -0,0 +1,137 @@
+#include <config.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <signal.h>
+#include <limits.h>
+#include <errno.h>
+#include <string.h>
+#include <regex.h>
+#include <ctype.h>
+#include <sys/time.h>
+#include <sys/select.h>
+#include <sys/wait.h>
+#include "grecs.h"
+#include "wordsplit.h"
+
+void setprogname(char const *s);
+void genrc_error(char const *fmt, ...);
+void usage_error(char const *fmt, ...);
+void system_error(int ec, char const *fmt, ...);
+
+#define xmalloc grecs_malloc
+#define xzalloc grecs_zalloc
+#define xcalloc grecs_calloc
+#define xrealloc grecs_realloc
+#define xstrdup grecs_strdup
+
+#define SHELL "/bin/sh"
+
+pid_t file_read_pid(char const *filename);
+
+typedef struct transform *TRANSFORM;
+char *transform_string(TRANSFORM tf, const char *input);
+char *transform_string_if_match(TRANSFORM tf, const char *input);
+TRANSFORM compile_transform_expr(const char *expr, int cflags);
+
+struct pidlist {
+	pid_t *pidv;
+	size_t pidc;
+	size_t pidn;
+};
+typedef struct pidlist PIDLIST;
+
+void pidlist_init(PIDLIST *);
+void pidlist_free(PIDLIST *);
+void pidlist_clear(PIDLIST *plist);
+void pidlist_add(PIDLIST *, pid_t);
+ssize_t pidlist_index(PIDLIST *plist, pid_t p);
+int pidlist_member(PIDLIST *plist, pid_t p);
+int pidlist_remove(PIDLIST *plist, size_t i);
+void pidlist_kill(PIDLIST *plist, int sig);
+
+pid_t strtopid(char const *str);
+
+int pid_is_running(pid_t pid);
+
+
+enum {
+	MATCH_REGEX,  /* extended POSIX regexp match (default) */
+	MATCH_PCRE,   /* PCRE match (not implemented) */
+	MATCH_GLOB,   /* glob pattern match */
+	MATCH_EXACT,  /* exact match */
+};
+#define MATCH_DEFAULT MATCH_REGEX
+
+enum {
+	PROCF_ICASE   = 0x01, /* ignore case */
+	PROCF_ALL     = 0x02, /* use all pids */
+	PROCF_CMDLINE = 0x04, /* match against entire command line */
+	PROCF_EXE     = 0x08  /* match against executable name */	
+};
+#define PROCF_DEFAULT 0
+
+struct procscanbuf {
+	int match;   /* match type */
+	int flags;   /* match flags */
+	void *pattern;
+};
+
+typedef struct procscanbuf *PROCSCANBUF;
+
+PROCSCANBUF procscan_init(char const *pattern, char const *flagstr);
+void procscan_free(PROCSCANBUF buf);
+int procscan_match(PROCSCANBUF buf, char const *arg);
+
+void match_exact_init(PROCSCANBUF buf, char const *pattern);
+void match_exact_free(PROCSCANBUF buf);
+int match_exact(PROCSCANBUF buf, char const *arg);
+
+void match_glob_init(PROCSCANBUF buf, char const *pattern);
+void match_glob_free(PROCSCANBUF buf);
+int match_glob(PROCSCANBUF buf, char const *arg);
+
+void match_regex_init(PROCSCANBUF buf, char const *pattern);
+void match_regex_free(PROCSCANBUF buf);
+int match_regex(PROCSCANBUF buf, char const *arg);
+
+void match_pcre_init(PROCSCANBUF buf, char const *pattern);
+void match_pcre_free(PROCSCANBUF buf);
+int match_pcre(PROCSCANBUF buf, char const *arg);
+
+
+
+struct genrc_pid_closure {
+	char const *name;
+        int (*pid)(struct genrc_pid_closure *, PIDLIST *);
+};
+
+typedef struct genrc_pid_closure GENRC_PID_CLOSURE;
+GENRC_PID_CLOSURE *get_pid_closure(char const *str);
+int get_pid_list(GENRC_PID_CLOSURE *, PIDLIST *);
+
+GENRC_PID_CLOSURE *genrc_pid_file_init(int argc, char **argv);
+GENRC_PID_CLOSURE *genrc_pid_config_init(int argc, char **argv);
+GENRC_PID_CLOSURE *genrc_pid_grep_init(int argc, char **argv);
+GENRC_PID_CLOSURE *genrc_pid_proc_init(int argc, char **argv);
+GENRC_PID_CLOSURE *genrc_pid_ps_init(int argc, char **argv);
+
+extern char *genrc_command;
+extern char *genrc_program;
+extern char *genrc_pid_from;
+extern unsigned genrc_timeout;
+extern int genrc_no_reload;
+extern int genrc_signal_reload;
+extern int genrc_signal_stop;
+extern GENRC_PID_CLOSURE *genrc_pid_closure;
+extern char *genrc_pidfile;
+
+int sentinel(void);
+
+int com_start(void);
+int com_status(void);
+int com_stop(void);
+int com_restart(void);
+int com_reload(void);
+
diff --git a/src/match_exact.c b/src/match_exact.c
new file mode 100644
index 0000000..49be17f
--- a/dev/null
+++ b/src/match_exact.c
@@ -0,0 +1,20 @@
+#include "genrc.h"
+
+void
+match_exact_init(PROCSCANBUF buf, char const *pattern)
+{
+	buf->pattern = xstrdup(pattern ? pattern : genrc_program);
+}
+
+void
+match_exact_free(PROCSCANBUF buf)
+{
+	free(buf->pattern);
+}
+
+int
+match_exact(PROCSCANBUF buf, char const *arg)
+{
+	return ((buf->flags & PROCF_ICASE) ? strcasecmp : strcmp)
+		((char*)buf->pattern, arg);
+}
diff --git a/src/match_glob.c b/src/match_glob.c
new file mode 100644
index 0000000..d2dfd71
--- a/dev/null
+++ b/src/match_glob.c
@@ -0,0 +1,22 @@
+#include "genrc.h"
+#define _GNU_SOURCE 1
+#include <fnmatch.h>
+
+void
+match_glob_init(PROCSCANBUF buf, char const *pattern)
+{
+	buf->pattern = xstrdup(pattern ? pattern : genrc_program);
+}
+
+void
+match_glob_free(PROCSCANBUF buf)
+{
+	free(buf->pattern);
+}
+
+int
+match_glob(PROCSCANBUF buf, char const *arg)
+{
+	return fnmatch((char*)buf->pattern, arg,
+		       (buf->flags & PROCF_ICASE) ? FNM_CASEFOLD : 0);
+}
diff --git a/src/match_pcre.c b/src/match_pcre.c
new file mode 100644
index 0000000..55c4714
--- a/dev/null
+++ b/src/match_pcre.c
@@ -0,0 +1,60 @@
+#include "genrc.h"
+#include <pcre.h>
+
+static char *
+progname_pattern(char const *prog)
+{
+	grecs_txtacc_t acc;
+	char *ret;
+	static char const specials[] = "\\[]?.*+(){}|";
+	
+	acc = grecs_txtacc_create();
+	grecs_txtacc_grow_char(acc, '^');
+	if (prog[0] != '/')
+		grecs_txtacc_grow_string(acc, "(?:/(?:.*/)?)?");
+	for (; *prog; prog++) {
+		if (strchr(specials, *prog))
+			grecs_txtacc_grow_char(acc, '\\');
+		grecs_txtacc_grow_char(acc, *prog);
+	}
+	grecs_txtacc_grow_char(acc, '$');
+	grecs_txtacc_grow_char(acc, 0);
+	ret = grecs_txtacc_finish(acc, 1);
+	grecs_txtacc_free(acc);
+	return ret;
+}
+
+void
+match_pcre_init(PROCSCANBUF buf, char const *pattern)
+{
+	pcre *pcre;
+	char const *error;
+	int error_offset;
+	char *tmp = NULL;
+	int cflags = 0;
+	if (buf->flags & PROCF_ICASE)
+		cflags |= PCRE_CASELESS;
+	if (!pattern) {
+		pattern = tmp = progname_pattern(genrc_program);
+	}		
+	pcre = pcre_compile(pattern, cflags, &error, &error_offset, 0);
+	free(tmp);
+	if (!pcre)
+		usage_error("%s at offset %d", error, error_offset);
+	buf->pattern = pcre;
+}
+
+void
+match_pcre_free(PROCSCANBUF buf)
+{
+	pcre_free ((pcre*)buf->pattern);
+}
+
+int
+match_pcre(PROCSCANBUF buf, char const *arg)
+{
+	int rc = pcre_exec((pcre*)buf->pattern, 0, arg, strlen(arg),
+			   0, 0, NULL, 0);
+	return !(rc >= 0);
+	/* FIXME: error message unless rc == PCRE_ERROR_NOMATCH */
+}
diff --git a/src/match_regex.c b/src/match_regex.c
new file mode 100644
index 0000000..fc666c9
--- a/dev/null
+++ b/src/match_regex.c
@@ -0,0 +1,61 @@
+#include "genrc.h"
+
+static char *
+progname_pattern(char const *prog)
+{
+	grecs_txtacc_t acc;
+	char *ret;
+	static char const specials[] = "\\[]?.*+(){}|";
+	
+	acc = grecs_txtacc_create();
+	grecs_txtacc_grow_char(acc, '^');
+	if (prog[0] != '/')
+		grecs_txtacc_grow_string(acc, "(/(.*/)?)?");
+	for (; *prog; prog++) {
+		if (strchr(specials, *prog))
+			grecs_txtacc_grow_char(acc, '\\');
+		grecs_txtacc_grow_char(acc, *prog);
+	}
+	grecs_txtacc_grow_char(acc, '$');
+	grecs_txtacc_grow_char(acc, 0);
+	ret = grecs_txtacc_finish(acc, 1);
+	grecs_txtacc_free(acc);
+	return ret;
+}
+
+void
+match_regex_init(PROCSCANBUF buf, char const *pattern)
+{
+	regex_t *rx = xmalloc(sizeof(*rx));
+	int rc;
+	char *tmp = NULL;
+	int cflags = REG_EXTENDED|REG_NOSUB;
+	if (buf->flags & PROCF_ICASE)
+		cflags |= REG_ICASE;
+	if (!pattern) {
+		pattern = tmp = progname_pattern(genrc_program);
+	}
+		
+	rc = regcomp(rx, pattern, cflags);
+	free(tmp);
+	if (rc) {
+		char errbuf[512];
+		regerror(rc, rx, errbuf, sizeof(errbuf));
+		usage_error("invalid regular expression: %s", errbuf);
+	}
+	buf->pattern = rx;
+}
+
+void
+match_regex_free(PROCSCANBUF buf)
+{
+	regfree((regex_t*)buf->pattern);
+	free(buf->pattern);
+}
+
+int
+match_regex(PROCSCANBUF buf, char const *arg)
+{
+	return regexec((regex_t*)buf->pattern, arg, 0, NULL, 0);
+}
+
diff --git a/src/pid_config.c b/src/pid_config.c
new file mode 100644
index 0000000..b646cc0
--- a/dev/null
+++ b/src/pid_config.c
@@ -0,0 +1,91 @@
+#include "genrc.h"
+
+typedef	struct grecs_node *(*GRECS_PARSER_FUNC)(const char *, int);
+
+struct config_pid_closure {
+	struct genrc_pid_closure generic;
+	char *filename;
+	char *fqrn;
+	GRECS_PARSER_FUNC parser;
+};
+
+static int
+pid_config_get(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
+{
+	struct config_pid_closure *config_clos =
+		(struct config_pid_closure *)clos;
+	struct grecs_node *tree, *node;
+	pid_t pid;
+	
+	grecs_parser_fun = config_clos->parser;
+	tree = grecs_parse(config_clos->filename);
+	if (!tree)
+		exit(1);
+	node = grecs_find_node(tree, config_clos->fqrn);
+	if (!node)
+		usage_error("%s: relation %s not found",
+			    config_clos->filename,
+			    config_clos->fqrn);
+	if (node->type != grecs_node_stmt)
+		usage_error("%s: relation %s is not a statement",
+			    config_clos->filename,
+			    config_clos->fqrn);
+	if (node->v.value->type != GRECS_TYPE_STRING)
+		usage_error("%s: relation %s is not a string",
+			    config_clos->filename,
+			    config_clos->fqrn);
+
+	pid = file_read_pid(node->v.value->v.string);
+	grecs_tree_free(tree);
+
+	if (pid == -1)
+		return -1;
+	if (pid > 0)
+		pidlist_add(plist, pid);
+	
+	return 0;
+}
+
+struct langtab {
+	char const *lang_name;
+	GRECS_PARSER_FUNC lang_parser;
+};
+
+static struct langtab langtab[] = {
+	{ "GRECS", grecs_grecs_parser },
+	{ "META1", grecs_meta1_parser },
+	{ "BIND",  grecs_bind_parser },
+	{ "DHCPD", grecs_dhcpd_parser },
+	{ "GIT",   grecs_git_parser },
+	{ "PATH",  grecs_path_parser },
+	{ NULL, NULL }
+};
+
+static GRECS_PARSER_FUNC
+find_parser(const char *lang)
+{
+	struct langtab *p;
+	for (p = langtab; p->lang_name; p++)
+		if (strcmp(p->lang_name, lang) == 0)
+			break;
+	return p->lang_parser;
+}
+
+GENRC_PID_CLOSURE *
+genrc_pid_config_init(int argc, char **argv)
+{
+	struct config_pid_closure *clos;
+	
+	if (argc != 4)
+		usage_error("expected format: CONFIG:<LANG>:<FILE>:<FQRN>");
+
+	clos = xmalloc(sizeof(*clos));
+	clos->generic.pid = pid_config_get;
+	clos->parser = find_parser(argv[1]);
+	if (!clos->parser)	
+		usage_error("%s: unsupported parser type", argv[1]);
+	clos->filename = xstrdup(argv[2]);
+	clos->fqrn = xstrdup(argv[3]);
+	return (GENRC_PID_CLOSURE *) clos;
+}
+		
diff --git a/src/pid_file.c b/src/pid_file.c
new file mode 100644
index 0000000..344de12
--- a/dev/null
+++ b/src/pid_file.c
@@ -0,0 +1,70 @@
+#include "genrc.h"
+
+struct file_pid_closure {
+	struct genrc_pid_closure generic;
+	char *filename;
+};
+
+pid_t
+file_read_pid(char const *filename)
+{
+	FILE *fp;
+	char buf[256];
+	int n, ec, ok;
+	unsigned long pid;
+	char *end;
+		
+	fp = fopen(filename, "r");
+	if (!fp) {
+		if (errno == ENOENT)
+			return 0;
+		system_error(errno, "can't open file %s", filename);
+		return -1;
+	}
+	ok = fgets(buf, sizeof(buf), fp) != NULL;
+	ec = errno;
+	fclose(fp);
+	if (!ok) {
+		system_error(ec, "error reading from %s", filename);
+		return -1;
+	}
+	n = strlen(buf);
+	if (n == 0) {
+		genrc_error("invalid line read from %s", filename);
+		return -1;
+	}
+	if (buf[n-1] == '\n')
+		buf[n-1] = 0;
+	errno = 0;
+	pid = strtoul(buf, &end, 10);
+	if (errno || *end) {
+		genrc_error("invalid line read from %s", filename);
+		return -1;
+	}
+	return pid_is_running(pid) ? pid : 0;
+}
+
+static int
+pid_file_get(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
+{
+	struct file_pid_closure *file_clos = (struct file_pid_closure *)clos;
+	pid_t pid = file_read_pid(file_clos->filename);
+	if (pid == -1)
+		return -1;
+	if (pid > 0)
+		pidlist_add(plist, pid);
+	return 0;
+}
+
+GENRC_PID_CLOSURE *
+genrc_pid_file_init(int argc, char **argv)
+{
+	struct file_pid_closure *clos;
+	
+	if (argc != 2)
+		usage_error("%s: expected format: FILE:<FILENAME>", argv[0]);
+	clos = xmalloc(sizeof(*clos));
+	clos->generic.pid = pid_file_get;
+	clos->filename = xstrdup(argv[1]);
+	return (GENRC_PID_CLOSURE *)clos;
+}
diff --git a/src/pid_grep.c b/src/pid_grep.c
new file mode 100644
index 0000000..8869a2d
--- a/dev/null
+++ b/src/pid_grep.c
@@ -0,0 +1,80 @@
+#include "genrc.h"
+
+/*
+GREP:<FILE>:s/<RX>/<REPL>/[<FLAGS>]
+
+Grep for the first line in <FILE> that matches <RX>. If found, process the
+string using the SED expression and return the result.
+*/
+
+struct grep_pid_closure {
+	struct genrc_pid_closure generic;
+	char *filename;
+	TRANSFORM tf;
+};
+
+static int
+pid_grep_get(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
+{
+	struct grep_pid_closure *grep_clos = (struct grep_pid_closure *)clos;
+	FILE *fp;
+	char *buf = NULL;
+	size_t size = 0;
+	ssize_t n;
+	char *res = NULL;
+	pid_t pid;
+	
+	fp = fopen(grep_clos->filename, "r");
+	if (!fp) {
+		if (errno == ENOENT)
+			return 0;
+		system_error(errno, "can't open file %s", grep_clos->filename);
+		return -1;
+	}
+
+	while ((n = grecs_getline(&buf, &size, fp)) > 0) {
+		buf[--n] = 0;
+		if (n == 0)
+			continue;
+		res = transform_string_if_match(grep_clos->tf, buf);
+		if (res)
+			break;
+	}
+	free(buf);
+	fclose(fp);
+
+	if (!res) {
+		usage_error("%s: no match for %s",
+			    grep_clos->filename,
+			    grep_clos->generic.name);
+		return -1;
+	}
+
+	pid = file_read_pid(res);
+	free(res);
+
+	if (pid == -1)
+		return -1;
+	if (pid > 0)
+		pidlist_add(plist, pid);
+	
+	return 0;
+}
+
+GENRC_PID_CLOSURE *
+genrc_pid_grep_init(int argc, char **argv)
+{
+	struct grep_pid_closure *clos;
+	
+	if (argc != 3)
+		usage_error("expected format: GREP:<FILE>:s/<RX>/<REPL>/[<FLAGS>];...");
+
+	clos = xmalloc(sizeof(*clos));
+	clos->generic.pid = pid_grep_get;
+	clos->filename = xstrdup(argv[1]);
+	clos->tf = compile_transform_expr(argv[2], REG_EXTENDED);
+
+	return (GENRC_PID_CLOSURE *) clos;
+}
+
+
diff --git a/src/pid_proc.c b/src/pid_proc.c
new file mode 100644
index 0000000..e460dff
--- a/dev/null
+++ b/src/pid_proc.c
@@ -0,0 +1,335 @@
+#include "genrc.h"
+#include <glob.h>
+#include <sys/stat.h>
+
+
+char *
+catfile(char const *dir, char const *file)
+{
+	char *ret;
+	size_t dlen, flen;
+
+	dlen = strlen(dir);
+	if (dlen > 0 && dir[dlen-1] == '/')
+		dlen--;
+	flen = strlen(file);
+	ret = xmalloc(dlen + flen + 2);
+	memcpy(ret, dir, dlen);
+	ret[dlen] = '/';
+	strcpy(ret + dlen + 1, file);
+	return ret;
+}
+
+#define INITIAL_READLINK_SIZE 128
+
+static int
+areadlink(const char *name, char **pbuf)
+{
+	size_t status = 0;
+	char *buf;
+	size_t size;
+	ssize_t linklen;
+
+	size = INITIAL_READLINK_SIZE;
+	buf = malloc(size);
+	if (!buf)
+		return -1;
+	while (1) {
+		char *p;
+		size_t newsize = size << 1;
+		if (newsize < size) {
+			status = ENAMETOOLONG;
+			break;
+		}
+		size = newsize;
+		p = realloc(buf, size);
+		if (!p)
+			free(buf);
+		buf = p;
+		if (!buf) {
+			status = ENOMEM;
+			break;
+		}
+      
+		linklen = readlink(name, buf, size);
+		if (linklen < 0 && errno != ERANGE) {
+			status = errno;
+			break;
+		}
+
+		if ((size_t) linklen < size) {
+			buf[linklen++] = '\0';
+			status = 0;
+			break;
+		}
+	}
+
+	if (status) {
+		free(buf);
+		errno = status;
+		return -1;
+	}
+	*pbuf = buf;
+	return 0;
+}
+
+pid_t
+strtopid(char const *str)
+{
+	unsigned long n;
+	char *end;
+	errno = 0;
+	n = strtoul(str, &end, 10);
+	if (errno || *end)
+		return -1;
+	return (pid_t) n;
+}
+
+struct proc_pid_closure {
+	struct genrc_pid_closure generic;
+	PROCSCANBUF buf;
+};
+
+pid_t
+parent_pid(pid_t p)
+{
+	FILE *fp;
+	char *filename = NULL;
+	size_t s = 0;
+	char *line = NULL;
+	ssize_t n;
+	struct wordsplit ws;
+	pid_t pid;
+	
+	grecs_asprintf(&filename, &s, "/proc/%lu/stat", (unsigned long)p);
+	fp = fopen(filename, "r");
+	if (!fp) {
+		system_error(errno, "can't open file %s", filename);
+		free(filename);
+		return -1;
+	}
+	s = 0;
+	n = grecs_getline(&line, &s, fp);
+	fclose(fp);
+	if (n == -1) {
+		system_error(errno, "error reading from %s", filename);
+		free(filename);
+		return -1;
+	}
+	free(filename);
+	if (n == 0) 
+		return 0;
+
+	ws.ws_delim = " ";
+	ws.ws_error = genrc_error;
+	if (wordsplit(line, &ws, 
+		      WRDSF_NOCMD|WRDSF_NOVAR|WRDSF_QUOTE|
+		      WRDSF_DELIM|WRDSF_ENOMEMABRT|WRDSF_SHOWERR|WRDSF_ERROR))
+		exit(1);
+	pid = strtopid(ws.ws_wordv[3]);
+	wordsplit_free(&ws);
+	return pid;
+}
+
+static void
+parent_pids_filter(PIDLIST *plist)
+{
+	int more;
+	size_t i;
+	
+	do {
+		more = 0;
+		for (i = 0; i < plist->pidc; ) {
+			pid_t ppid = parent_pid(plist->pidv[i]);
+			if (ppid > 1 && pidlist_member(plist, ppid)) {
+				pidlist_remove(plist, i);
+				more = 1;
+			} else
+				i++;
+		}
+	} while (more);
+}
+
+static int
+match_exe(struct proc_pid_closure *clos, char const *dir)
+{
+	char *fname = catfile(dir, "exe");
+	char *exename;
+	struct stat st;
+	int rc = 0;
+	
+	if (lstat(fname, &st)) {
+		if (errno != ENOENT)
+			system_error(errno, "stat %s", fname);
+		rc = -1;
+	} else {
+		if (!S_ISLNK(st.st_mode)) {
+			rc = -1;
+		} else if (areadlink(fname, &exename)) {
+			if (errno != ENOENT)
+				system_error(errno, "readlink %s", fname);
+			rc = -1;
+		}
+	}
+	free(fname);
+	if (rc == 0) {
+		rc = procscan_match(clos->buf, exename);
+		free(exename);
+	}
+	return rc;
+}
+	
+static int
+match_cmdline(struct proc_pid_closure *clos, char const *dir)
+{
+	char *fname = catfile(dir, "cmdline");
+	FILE *fp;
+	int c;
+	int nul = 0;
+	grecs_txtacc_t acc;
+	int rc;
+	char *cmdline;
+	
+	fp = fopen(fname, "r");
+	if (!fp) {
+		system_error(errno, "fopen %s", fname);
+		free(fname);
+		return -1;
+	}
+	acc = grecs_txtacc_create();
+	
+	while ((c = fgetc(fp)) != EOF) {
+		if (nul) {
+			grecs_txtacc_grow_char(acc, ' ');
+			nul = 0;
+		}
+		if (c == 0)
+			nul = 1;
+		else
+			grecs_txtacc_grow_char(acc, c);
+	}
+	fclose(fp);
+	free(fname);
+
+	grecs_txtacc_grow_char(acc, 0);
+	cmdline = grecs_txtacc_finish(acc, 0);
+
+	rc = procscan_match(clos->buf, cmdline);
+	grecs_txtacc_free(acc);
+	return rc;
+}
+
+static int
+match_argv0(struct proc_pid_closure *clos, char const *dir)
+{
+	char *fname = catfile(dir, "cmdline");
+	FILE *fp;
+	int c;
+	grecs_txtacc_t acc;
+	int rc;
+	char *argv0;
+	
+	fp = fopen(fname, "r");
+	if (!fp) {
+		system_error(errno, "fopen %s", fname);
+		free(fname);
+		return -1;
+	}
+	acc = grecs_txtacc_create();
+	
+	while ((c = fgetc(fp)) != EOF) {
+		grecs_txtacc_grow_char(acc, c);
+		if (c == 0)
+			break;
+	}
+	fclose(fp);
+	free(fname);
+
+	argv0 = grecs_txtacc_finish(acc, 0);
+	
+	rc = procscan_match(clos->buf, argv0);
+	grecs_txtacc_free(acc);
+	return rc;
+}
+
+static void
+scandir(struct proc_pid_closure *clos, char const *dir, PIDLIST *plist)
+{
+	int rc;
+	struct stat st;
+
+	if (stat(dir, &st)) {
+		if (errno != ENOENT)
+			system_error(errno, "stat %s", dir);
+		return;
+	}
+	if (!S_ISDIR(st.st_mode))
+		return;
+	
+	if (clos->buf->flags & PROCF_CMDLINE) {
+		rc = match_cmdline(clos, dir);
+	} else if (clos->buf->flags & PROCF_EXE) {
+		rc = match_exe(clos, dir);
+	} else {
+		rc = match_argv0(clos, dir);
+	}
+	
+	if (rc == 0) {
+		pidlist_add(plist, strtopid(dir + sizeof("/proc")));
+	}
+}					  
+	
+
+static int
+globerr(const char *epath, int ec)
+{
+	system_error(ec, "%s", epath);
+	return 0;
+}
+
+static int
+pid_proc_get(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
+{
+	struct proc_pid_closure *proc_clos = (struct proc_pid_closure *)clos;
+	glob_t gl;
+	char const *dirpat = "/proc/[0-9]*";
+	int i;
+
+	switch (glob(dirpat, GLOB_NOSORT|GLOB_ONLYDIR, globerr, &gl)) {
+	case GLOB_NOSPACE:
+		grecs_alloc_die();
+	case GLOB_ABORTED:
+		genrc_error("read error during glob scan");
+		exit(1);
+	case GLOB_NOMATCH:
+		return 0;
+	}
+
+	for (i = 0; i < gl.gl_pathc; i++) {
+		scandir(proc_clos, gl.gl_pathv[i], plist);
+	}
+	globfree(&gl);
+
+	if (plist->pidc > 1 && !(proc_clos->buf->flags & PROCF_ALL))
+		parent_pids_filter(plist);
+	
+	return 0;
+}
+
+GENRC_PID_CLOSURE *
+genrc_pid_proc_init(int argc, char **argv)
+{
+	struct proc_pid_closure *clos;
+
+	if (argc > 3)
+		usage_error("expected format: PROC[:[<EXE>][:<FLAGS>]]");
+
+	clos = xzalloc(sizeof *clos);
+	
+	clos->buf = procscan_init((argc >= 2 && argv[1][0] != 0)
+				  ? argv[1] : NULL,
+				  argc > 2 ? argv[2] : NULL);
+	clos->generic.pid = pid_proc_get;
+	
+	return (GENRC_PID_CLOSURE *)clos;
+}
diff --git a/src/pid_ps.c b/src/pid_ps.c
new file mode 100644
index 0000000..573304d
--- a/dev/null
+++ b/src/pid_ps.c
@@ -0,0 +1,137 @@
+#include "genrc.h"
+
+struct ps_pid_closure {
+	struct genrc_pid_closure generic;
+	PROCSCANBUF buf;
+};
+
+enum {
+	UID_COL = 0,
+	PID_COL,
+	PPID_COL,
+	C_COL,
+	STIME_COL,
+	TTY_COL,
+	TIME_COL,
+	CMD_COL
+};
+
+static int
+match_cmdline(struct ps_pid_closure *clos, struct wordsplit const *ws)
+{
+	grecs_txtacc_t acc;
+	size_t i;
+	int rc;
+	char *cmdline;
+	
+	acc = grecs_txtacc_create();
+	grecs_txtacc_grow_string(acc, ws->ws_wordv[CMD_COL]);
+	for (i = CMD_COL + 1; i < ws->ws_wordc; i++) {
+		grecs_txtacc_grow_char(acc, ' ');
+		grecs_txtacc_grow_string(acc, ws->ws_wordv[i]);
+	}
+	grecs_txtacc_grow_char(acc, 0);
+	cmdline = grecs_txtacc_finish(acc, 0);
+	rc = procscan_match(clos->buf, cmdline);
+	grecs_txtacc_free(acc);
+	return rc;
+}
+
+static int
+match_argv0(struct ps_pid_closure *clos, struct wordsplit const *ws)
+{
+	return procscan_match(clos->buf, ws->ws_wordv[CMD_COL]);
+}
+
+static int
+match(struct ps_pid_closure *clos, struct wordsplit const *ws)
+{
+	return ((clos->buf->flags & PROCF_CMDLINE)
+		? match_cmdline : match_argv0)(clos, ws);
+}
+
+static int
+pid_ps_get(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
+{
+	struct ps_pid_closure *ps_clos = (struct ps_pid_closure *)clos;
+	FILE *fp;
+	struct wordsplit ws;
+	int wsflags;
+	ssize_t n;
+	char *buf = NULL;
+	size_t size = 0;
+	size_t line = 0;
+	PIDLIST pplist;
+	
+	fp = popen("ps -ef", "r");
+	if (!fp) {
+		system_error(errno, "failed to run ps");
+		return -1;
+	}
+
+	ws.ws_delim = " ";
+	ws.ws_error = genrc_error;	
+	wsflags = WRDSF_NOCMD
+		| WRDSF_NOVAR
+		| WRDSF_QUOTE
+		| WRDSF_DELIM
+		| WRDSF_SQUEEZE_DELIMS
+		| WRDSF_ENOMEMABRT
+		| WRDSF_SHOWERR
+		| WRDSF_ERROR;
+	pidlist_init(&pplist);
+	while ((n = grecs_getline(&buf, &size, fp)) > 0) {
+		line++;
+		if (line == 1)
+			continue;
+		buf[n-1] = 0;
+		if (wordsplit(buf, &ws, wsflags))
+			exit(1);
+		wsflags |= WRDSF_REUSE;
+		if (match(ps_clos, &ws) == 0) {
+			pid_t ppid = strtopid(ws.ws_wordv[PPID_COL]);
+			if (!pidlist_member(&pplist, ppid))
+				pidlist_add(&pplist, ppid);
+			pidlist_add(plist, strtopid(ws.ws_wordv[PID_COL]));
+		}
+	}
+	fclose(fp);
+	free(buf);
+	if (wsflags & WRDSF_REUSE)
+		wordsplit_free(&ws);
+	if (plist->pidc > 1 && !(ps_clos->buf->flags & PROCF_ALL)) {
+		size_t i;
+		
+		for (i = 0; i < pplist.pidc; ) {
+			if (pidlist_member(plist, pplist.pidv[i]))
+				i++;
+			else {
+				pidlist_remove(&pplist, i);
+			}
+		}
+		pidlist_free(plist);
+		*plist = pplist;
+	}
+
+	return 0;
+}
+
+GENRC_PID_CLOSURE *
+genrc_pid_ps_init(int argc, char **argv)
+{
+	struct ps_pid_closure *clos;
+
+	if (argc > 3)
+		usage_error("expected format: PS[:[<EXE>][:<FLAGS>]]");
+
+	clos = xzalloc(sizeof *clos);
+	
+	clos->buf = procscan_init((argc >= 2 && argv[1][0] != 0)
+				    ? argv[1] : genrc_program,
+				  argc > 2 ? argv[2] : NULL);
+	if (clos->buf->flags & PROCF_EXE)
+		usage_error("flag r isn't compatible with PS");
+	clos->generic.pid = pid_ps_get;
+	
+	return (GENRC_PID_CLOSURE *)clos;
+}
diff --git a/src/pidfrom.c b/src/pidfrom.c
new file mode 100644
index 0000000..ab1f623
--- a/dev/null
+++ b/src/pidfrom.c
@@ -0,0 +1,52 @@
+#include "genrc.h"
+
+struct genrc_pid_source {
+	char *name;
+	GENRC_PID_CLOSURE *(*init)(int argc, char **argv);
+};
+
+struct genrc_pid_source sourcetab[] = {
+	{ "FILE",   genrc_pid_file_init },
+	{ "CONFIG", genrc_pid_config_init },
+	{ "GREP",   genrc_pid_grep_init },
+	{ "PROC",   genrc_pid_proc_init },
+	{ "PS",     genrc_pid_ps_init },
+	{ NULL }
+};
+
+GENRC_PID_CLOSURE *
+get_pid_closure(char const *str)
+{
+	struct genrc_pid_source *s;
+	struct wordsplit ws;
+	GENRC_PID_CLOSURE *pc;
+	
+	ws.ws_error = genrc_error;
+	ws.ws_delim = ":";
+	if (wordsplit(str, &ws, 
+		      WRDSF_NOCMD|WRDSF_NOVAR|WRDSF_QUOTE|
+		      WRDSF_DELIM|WRDSF_ENOMEMABRT|WRDSF_SHOWERR|WRDSF_ERROR))
+		exit(1);
+
+	if (ws.ws_wordc == 0)
+		usage_error("GENRC_PID_FROM argument is empty");
+	for (s = sourcetab; ; s++) {
+		if (!s->name)
+			usage_error("%s: unsupported PID source", str);
+		if (strcmp(s->name, ws.ws_wordv[0]) == 0)
+			break;
+	}
+	pc = s->init(ws.ws_wordc, ws.ws_wordv);
+	if (!pc)
+		exit(1);
+	pc->name = xstrdup(str);
+	return pc;
+}
+
+int
+get_pid_list(GENRC_PID_CLOSURE *clos, PIDLIST *plist)
+{
+	pidlist_clear(plist);
+	return clos->pid(clos, plist);
+}
+
diff --git a/src/pidlist.c b/src/pidlist.c
new file mode 100644
index 0000000..cf47c2e
--- a/dev/null
+++ b/src/pidlist.c
@@ -0,0 +1,121 @@
+#include "genrc.h"
+
+void *
+x2nrealloc(void *p, size_t *pn, size_t s)
+{
+	size_t n = *pn;
+  
+	if (!p) {
+		if (!n) {
+			/* The approximate size to use for initial small
+			   allocation requests, when the invoking code
+			   specifies an old size of zero.  64 bytes is
+			   the largest "small" request for the
+			   GNU C library malloc.  */
+			enum { DEFAULT_MXFAST = 64 };
+
+			n = DEFAULT_MXFAST / s;
+			n += !n;
+		}
+	} else {
+		/* Set N = ceil (1.5 * N) so that progress is made if N == 1.
+		   Check for overflow, so that N * S stays in size_t range.
+		   The check is slightly conservative, but an exact check isn't
+		   worth the trouble.  */
+		if ((size_t) -1 / 3 * 2 / s <= n)
+			grecs_alloc_die();
+		n += (n + 1) / 2;
+	}
+
+	*pn = n;
+	return grecs_realloc(p, n * s);
+}
+
+void
+pidlist_init(PIDLIST *plist)
+{
+	plist->pidv = NULL;
+	plist->pidc = 0;
+	plist->pidn = 0;
+}
+
+void
+pidlist_free(PIDLIST *plist)
+{
+	free(plist->pidv);
+}
+
+void
+pidlist_clear(PIDLIST *plist)
+{
+	plist->pidc = 0;
+}
+
+void
+pidlist_add(PIDLIST *plist, pid_t p)
+{
+	if (p <= 0)
+		return;
+	if (plist->pidc == plist->pidn) {
+		plist->pidv = x2nrealloc(plist->pidv, &plist->pidn,
+					 sizeof(plist->pidv[0]));
+	}
+	plist->pidv[plist->pidc++] = p;
+}
+
+ssize_t
+pidlist_index(PIDLIST *plist, pid_t p)
+{
+	size_t i;
+	for (i = 0; i < plist->pidc; i++) {
+		if (plist->pidv[i] == p)
+			return i;
+	}
+	return -1;
+}
+
+int
+pidlist_member(PIDLIST *plist, pid_t p)
+{
+	return pidlist_index(plist, p) != -1;
+}
+
+int
+pidlist_remove(PIDLIST *plist, size_t i)
+{
+	if (i == -1)
+		return 0;
+
+	if (i < plist->pidc - 1) {
+		memmove(plist->pidv + i, plist->pidv + i + 1,
+			(plist->pidc - i - 1) * sizeof(plist->pidv[0]));
+	}
+	plist->pidc--;
+	return 1;
+}
+
+void
+pidlist_kill(PIDLIST *plist, int sig)
+{
+	size_t i;
+
+	for (i = 0; i < plist->pidc; i++) {
+		if (kill(plist->pidv[i], sig)) {
+			if (errno != ESRCH)
+				system_error(errno, "kill %lu",
+					     (unsigned long) plist->pidv[i]);
+		}
+	}
+}
+
+int
+pid_is_running(pid_t pid)
+{
+	if (kill(pid, 0)) {
+		if (errno == ESRCH)
+			return 0;
+		system_error(errno, "kill %lu", (unsigned long)pid);
+		exit(1);
+	}
+	return 1;
+}
diff --git a/src/procscan.c b/src/procscan.c
new file mode 100644
index 0000000..1425f6a
--- a/dev/null
+++ b/src/procscan.c
@@ -0,0 +1,95 @@
+#include "genrc.h"
+
+struct flagdfn {
+	int letter;   /* flag letter */
+	int is_match; /* is this flag a match mode */
+	int value;    /* flag value */
+};
+
+static struct flagdfn flagtab[] = {
+	{ 'e',   1, MATCH_EXACT },
+	{ 'g',   1, MATCH_GLOB  },
+	{ 'x',   1, MATCH_REGEX },
+	{ 'p',   1, MATCH_PCRE  },
+	{ 'i',   0, PROCF_ICASE },
+	{ 'a',   0, PROCF_ALL },
+	{ 'c',   0, PROCF_CMDLINE },
+	{ 'r',   0, PROCF_EXE },
+	{ 0 }
+};
+
+static struct flagdfn *
+find_flag(int let)
+{
+	struct flagdfn *p;
+
+	let = tolower(let);
+	for (p = flagtab; p->letter; p++)
+		if (p->letter == let)
+			return p;
+	return NULL;
+}
+
+struct match_type {
+	void (*match_init)(PROCSCANBUF, char const *);
+	void (*match_free)(PROCSCANBUF);
+	int (*match_func)(PROCSCANBUF, char const *);
+};
+
+struct match_type match_types[] = {
+	[MATCH_REGEX] = { match_regex_init, match_regex_free, match_regex },
+#ifdef HAVE_PCRE	
+	[MATCH_PCRE]  = { match_pcre_init, match_pcre_free, match_pcre },
+#endif	
+	[MATCH_GLOB]  = { match_glob_init, match_glob_free, match_glob },
+	[MATCH_EXACT] = { match_exact_init, match_exact_free, match_exact }
+};
+
+PROCSCANBUF 
+procscan_init(char const *pattern, char const *flagstr)
+{
+	PROCSCANBUF buf;
+
+	buf = xmalloc(sizeof(buf));
+	buf->match = MATCH_DEFAULT;
+	buf->flags = PROCF_DEFAULT;
+	if (flagstr) {
+		char const *p;
+		for (p = flagstr; *p; p++) {
+			struct flagdfn *flag = find_flag(*p);
+			if (!flag)
+				usage_error("%s: unknown flag %c",
+					    flagstr, *p);
+			if (flag->is_match) {
+				if (match_types[flag->value].match_init)
+					buf->match = flag->value;
+				else
+					usage_error("match type '%c' is not available", *p);
+			}
+			else if (isupper(*p))
+				buf->flags &= ~flag->value;
+			else
+				buf->flags |= flag->value;
+		}
+	}
+	match_types[buf->match].match_init(buf, pattern);
+	return buf;
+}
+
+void
+procscan_free(PROCSCANBUF buf)
+{
+	match_types[buf->match].match_free(buf);
+	free(buf);
+}
+
+int
+procscan_match(PROCSCANBUF buf, char const *arg)
+{
+	if (!arg)
+		return 1;
+	return match_types[buf->match].match_func(buf, arg);
+}
+
+
+
diff --git a/src/sentinel.c b/src/sentinel.c
new file mode 100644
index 0000000..0fe0714
--- a/dev/null
+++ b/src/sentinel.c
@@ -0,0 +1,207 @@
+#include "genrc.h"
+#include <unistd.h>
+#include <fcntl.h>
+#include <syslog.h>
+
+static void
+xpipe(int p[2])
+{
+	if (pipe(p)) {
+		system_error(errno, "pipe");
+		exit(1);
+	}
+}
+
+#define max(a,b) ((a) > (b) ? (a) : (b))
+
+static void
+write_pid_file(pid_t pid)
+{
+	if (genrc_pidfile) {
+		FILE *fp;
+		fp = fopen(genrc_pidfile, "w");
+		fprintf(fp, "%lu\n", (unsigned long)pid);
+		fclose(fp);
+	}
+}
+
+#define LOGBUFSIZE 1024
+
+struct log_buffer {
+	char buf[LOGBUFSIZE];
+	size_t pos;
+	int prio;
+};
+
+static void
+log_buffer_init(struct log_buffer *lb, int prio)
+{
+	lb->buf[sizeof(lb->buf) - 1] = 0;
+	lb->pos = 0;
+	lb->prio = prio;
+}
+
+static void
+log_buffer_read(int fd, struct log_buffer *lb)
+{
+	int rc;
+	
+	rc = read(fd, lb->buf + lb->pos, 1);
+	if (rc == -1) {
+		syslog(LOG_ERR, "read: %m");
+	} else if (rc == 1) {
+		if (lb->pos == sizeof(lb->buf)-1) {
+			syslog(lb->prio, "%s", lb->buf);
+			lb->pos = 0;
+		} else if (lb->buf[lb->pos] == '\n') {
+			lb->buf[lb->pos] = 0;
+			syslog(lb->prio, "%s", lb->buf);
+			lb->pos = 0;
+		} else
+			lb->pos++;
+	}
+}
+
+void
+wait_loop(pid_t child, int out, int err)
+{
+	fd_set rdset;
+	int nfd = (out > err ? out : err) + 1;
+	struct log_buffer obuf, ebuf;
+		
+	openlog(genrc_program, LOG_PID, LOG_DAEMON);
+	log_buffer_init(&obuf, LOG_INFO);
+	log_buffer_init(&ebuf, LOG_ERR);
+	
+	while (1) {
+		int rc, status;
+		
+		if (waitpid(child, &status, WNOHANG) == child) {
+			if (genrc_pidfile)
+				unlink(genrc_pidfile);
+			if (WIFEXITED(status)) {
+				syslog(LOG_INFO, "%s exited with status %d",
+				       genrc_program, WEXITSTATUS(status));
+				_exit(WEXITSTATUS(status));
+			} else if (WIFSIGNALED(status)) {
+				char const *coremsg = "";
+#ifdef WCOREDUMP
+				if (WCOREDUMP(status))
+					coremsg = " (core dumped)";
+#endif
+				syslog(LOG_INFO, "%s terminated on signal %d%s",
+				       genrc_program, WTERMSIG(status), coremsg);
+			} else if (WIFSTOPPED(status)) {
+				syslog(LOG_INFO, "%s stopped on signal %d",
+				       genrc_program, WSTOPSIG(status));
+			} else {
+				syslog(LOG_INFO, "%s terminated; status %d",
+				       genrc_program, rc);
+			}
+			break;
+		}
+		
+		FD_ZERO(&rdset);
+		FD_SET(out, &rdset);
+		FD_SET(err, &rdset);
+		rc = select(nfd, &rdset, NULL, NULL, NULL);
+		if (rc == -1) {
+			if (errno == EINTR)
+				continue;
+			syslog(LOG_CRIT, "select: %m");
+			syslog(LOG_CRIT, "killing %lu and terminating",
+			       (unsigned long) child);
+			kill(child, SIGKILL);
+			break;
+		}
+
+		if (FD_ISSET(out, &rdset)) {
+			log_buffer_read(out, &obuf);
+		}
+		if (FD_ISSET(err, &rdset)) {
+			log_buffer_read(err, &ebuf);
+		}
+	}
+	_exit(1);
+}
+
+pid_t
+start_command(int p[])
+{
+	int errpipe[2], outpipe[2];
+	pid_t pid;	
+	
+	xpipe(errpipe);
+	xpipe(outpipe);
+	pid = fork();
+	if (pid == -1) {
+		system_error(errno, "pipe");
+		return -1;
+	}
+
+	if (pid == 0) {
+		char *argv[] = { SHELL, "-c", NULL, NULL };
+		int i;
+		
+		close(0);
+		close(1);
+		close(2);
+		open("/dev/null", O_RDWR);
+		dup(outpipe[1]);
+		dup(errpipe[1]);
+
+		i = max(max(outpipe[0],outpipe[1]),
+			max(errpipe[0],errpipe[1]));
+		while (--i > 2)
+			close(i);
+
+		argv[2] = genrc_command;
+		execvp(SHELL, argv);
+		system_error(errno, "failed to exec %s", genrc_program);
+		exit(127);
+	}
+
+	write_pid_file(pid);
+		
+	close(outpipe[1]);
+	close(errpipe[1]);
+
+	p[0] = outpipe[0];
+	p[1] = errpipe[0];
+	return pid;
+}
+
+int
+sentinel(void)
+{
+	pid_t pid;
+	int p[2];
+	
+	/* Detach from the controlling terminal */
+	pid = fork();
+	if (pid == -1) {
+		system_error(errno, "fork");
+		return -1;
+	}
+	if (pid) /* master */
+		return 0;
+	/* Run as a session leader */
+	setsid();
+
+	pid = fork();
+	if (pid == -1) {
+		system_error(errno, "fork");
+		exit(1);
+	}
+	if (pid)
+		_exit(0);
+
+	/* Grand-child */
+	pid = start_command(p);
+	if (pid == -1)
+		_exit(127);
+	wait_loop(pid, p[0], p[1]);
+	_exit(1);
+}
+	
+	
diff --git a/src/transform.c b/src/transform.c
new file mode 100644
index 0000000..d3cccb1
--- a/dev/null
+++ b/src/transform.c
@@ -0,0 +1,560 @@
+/* This file is part of genrc.
+   Copyright (C) 2006-2018 Sergey Poznyakoff.
+   (using my implementation for the GNU tar).
+
+   Genrc is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   Genrc is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with genrc.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include "genrc.h"
+
+enum transform_type {
+	transform_first,
+	transform_global
+};
+
+enum replace_segm_type {
+	segm_literal,	 /* Literal segment */
+	segm_backref,	 /* Back-reference segment */
+	segm_case_ctl	 /* Case control segment (GNU extension) */
+};
+
+enum case_ctl_type {
+	ctl_stop,	 /* Stop case conversion */
+	ctl_upcase_next, /* Turn the next character to uppercase */
+	ctl_locase_next, /* Turn the next character to lowercase */
+	ctl_upcase,	 /* Turn the replacement to uppercase until ctl_stop */
+	ctl_locase	 /* Turn the replacement to lowercase until ctl_stop */
+};
+
+struct replace_segm {
+	struct replace_segm *next;
+	enum replace_segm_type type;
+	union {
+		struct {
+			char *ptr;
+			size_t size;
+		} literal;	/* type == segm_literal */
+		size_t ref;	/* type == segm_backref */
+		enum case_ctl_type ctl;	/* type == segm_case_ctl */
+	} v;
+};
+
+struct transform {
+	struct transform *next;
+	enum transform_type transform_type;
+	unsigned match_number;
+	regex_t regex;
+	/* Compiled replacement expression */
+	struct replace_segm *repl_head, *repl_tail;
+	size_t segm_count;	/* Number of elements in the above list */
+};
+
+struct transform_list {
+	struct transform *head, *tail;
+};
+
+static struct transform *
+new_transform(struct transform_list *tlist)
+{
+	struct transform *p = xzalloc(sizeof *p);
+	if (tlist->tail)
+		tlist->tail->next = p;
+	else
+		tlist->head = p;
+	tlist->tail = p;
+	return p;
+}
+
+static struct replace_segm *
+add_segment(struct transform *tf)
+{
+	struct replace_segm *segm = xmalloc(sizeof *segm);
+	segm->next = NULL;
+	if (tf->repl_tail)
+		tf->repl_tail->next = segm;
+	else
+		tf->repl_head = segm;
+	tf->repl_tail = segm;
+	tf->segm_count++;
+	return segm;
+}
+
+static void
+add_literal_segment(struct transform *tf, char *str, char *end)
+{
+	size_t len = end - str;
+	if (len) {
+		struct replace_segm *segm = add_segment(tf);
+		segm->type = segm_literal;
+		segm->v.literal.ptr = xmalloc(len + 1);
+		memcpy(segm->v.literal.ptr, str, len);
+		segm->v.literal.ptr[len] = 0;
+		segm->v.literal.size = len;
+	}
+}
+
+static void
+add_char_segment(struct transform *tf, int chr)
+{
+	struct replace_segm *segm = add_segment(tf);
+	segm->type = segm_literal;
+	segm->v.literal.ptr = xmalloc(2);
+	segm->v.literal.ptr[0] = chr;
+	segm->v.literal.ptr[1] = 0;
+	segm->v.literal.size = 1;
+}
+
+static void
+add_backref_segment(struct transform *tf, size_t ref)
+{
+	struct replace_segm *segm = add_segment(tf);
+	segm->type = segm_backref;
+	segm->v.ref = ref;
+}
+
+static void
+add_case_ctl_segment(struct transform *tf, enum case_ctl_type ctl)
+{
+	struct replace_segm *segm = add_segment(tf);
+	segm->type = segm_case_ctl;
+	segm->v.ctl = ctl;
+}
+
+static const char *
+parse_transform_expr(struct transform_list *tlist,
+		     const char *expr, int cflags)
+{
+	int delim;
+	int i, j, rc;
+	char *str, *beg, *cur;
+	const char *p;
+	struct transform *tf = new_transform(tlist);
+
+	if (expr[0] != 's')
+		usage_error("invalid transform expression: %s", expr);
+
+	delim = expr[1];
+
+	/* Scan regular expression */
+	for (i = 2; expr[i] && expr[i] != delim; i++)
+		if (expr[i] == '\\' && expr[i + 1])
+			i++;
+
+	if (expr[i] != delim)
+		usage_error("missing 2nd delimiter in position %d of expression %s",
+			    i, expr);
+
+	/* Scan replacement expression */
+	for (j = i + 1; expr[j] && expr[j] != delim; j++)
+		if (expr[j] == '\\' && expr[j + 1])
+			j++;
+
+	if (expr[j] != delim)
+		usage_error("missing trailing delimiter in position %d of expression %s",
+			    j, expr);
+
+	/* Check flags */
+	tf->transform_type = transform_first;
+	for (p = expr + j + 1; *p && *p != ';'; p++)
+		switch (*p) {
+		case 'g':
+			tf->transform_type = transform_global;
+			break;
+
+		case 'i':
+			cflags |= REG_ICASE;
+			break;
+
+		case 'x':
+			cflags |= REG_EXTENDED;
+			break;
+
+		case 'b':
+			cflags &= ~REG_EXTENDED;
+			break;
+
+		case '0':
+		case '1':
+		case '2':
+		case '3':
+		case '4':
+		case '5':
+		case '6':
+		case '7':
+		case '8':
+		case '9':
+			tf->match_number = strtoul(p, (char **)&p, 0);
+			p--;
+			break;
+
+		default:
+			usage_error("unknown flag in transform expression: %c",
+				    *p);
+		}
+
+	if (*p == ';')
+		p++;
+
+	/* Extract and compile regex */
+	str = xmalloc(i - 1);
+	memcpy(str, expr + 2, i - 2);
+	str[i - 2] = 0;
+
+	rc = regcomp(&tf->regex, str, cflags);
+
+	if (rc) {
+		char errbuf[512];
+		regerror(rc, &tf->regex, errbuf, sizeof(errbuf));
+		usage_error("invalid transform expression: %s", errbuf);
+	}
+
+	if (str[0] == '^' || str[strlen(str) - 1] == '$')
+		tf->transform_type = transform_first;
+
+	free(str);
+
+	/* Extract and compile replacement expr */
+	i++;
+	str = xmalloc(j - i + 1);
+	memcpy(str, expr + i, j - i);
+	str[j - i] = 0;
+
+	for (cur = beg = str; *cur;) {
+		if (*cur == '\\') {
+			size_t n;
+
+			add_literal_segment(tf, beg, cur);
+			switch (*++cur) {
+			case '0':
+			case '1':
+			case '2':
+			case '3':
+			case '4':
+			case '5':
+			case '6':
+			case '7':
+			case '8':
+			case '9':
+				n = strtoul(cur, &cur, 10);
+				if (n > tf->regex.re_nsub)
+					usage_error("invalid transform replacement: "
+						    "back reference out of range");
+				add_backref_segment(tf, n);
+				break;
+
+			case '\\':
+				add_char_segment(tf, '\\');
+				cur++;
+				break;
+
+			case 'a':
+				add_char_segment(tf, '\a');
+				cur++;
+				break;
+
+			case 'b':
+				add_char_segment(tf, '\b');
+				cur++;
+				break;
+
+			case 'f':
+				add_char_segment(tf, '\f');
+				cur++;
+				break;
+
+			case 'n':
+				add_char_segment(tf, '\n');
+				cur++;
+				break;
+
+			case 'r':
+				add_char_segment(tf, '\r');
+				cur++;
+				break;
+
+			case 't':
+				add_char_segment(tf, '\t');
+				cur++;
+				break;
+
+			case 'v':
+				add_char_segment(tf, '\v');
+				cur++;
+				break;
+
+			case '&':
+				add_char_segment(tf, '&');
+				cur++;
+				break;
+
+			case 'L':
+				/* Turn the replacement to lowercase until
+				   a `\U' or `\E' is found, */
+				add_case_ctl_segment(tf, ctl_locase);
+				cur++;
+				break;
+
+			case 'l':
+				/* Turn the next character to lowercase, */
+				add_case_ctl_segment(tf, ctl_locase_next);
+				cur++;
+				break;
+
+			case 'U':
+				/* Turn the replacement to uppercase until
+				   a `\L' or `\E' is found, */
+				add_case_ctl_segment(tf, ctl_upcase);
+				cur++;
+				break;
+
+			case 'u':
+				/* Turn the next character to uppercase, */
+				add_case_ctl_segment(tf, ctl_upcase_next);
+				cur++;
+				break;
+
+			case 'E':
+				/* Stop case conversion started by
+				   `\L' or `\U'. */
+				add_case_ctl_segment(tf, ctl_stop);
+				cur++;
+				break;
+
+			default:
+				if (*cur == delim)
+					add_char_segment(tf, delim);
+				else {
+					char buf[2];
+					buf[0] = '\\';
+					buf[1] = *cur;
+					add_literal_segment(tf, buf, buf + 2);
+				}
+				cur++;
+				break;
+			}
+			beg = cur;
+		} else if (*cur == '&') {
+			add_literal_segment(tf, beg, cur);
+			add_backref_segment(tf, 0);
+			beg = ++cur;
+		} else
+			cur++;
+	}
+	add_literal_segment(tf, beg, cur);
+
+	return p;
+}
+
+TRANSFORM
+compile_transform_expr(const char *expr, int cflags)
+{
+	struct transform_list tlist = { NULL, NULL };
+	while (*expr)
+		expr = parse_transform_expr(&tlist, expr, cflags);
+	return tlist.head;
+}
+
+/* Run case conversion specified by CASE_CTL on array PTR of SIZE
+   characters. Returns pointer to statically allocated storage. */
+static const char *
+run_case_conv(enum case_ctl_type case_ctl, const char *ptr, size_t size)
+{
+	static char *case_ctl_buffer;
+	static size_t case_ctl_bufsize;
+	char *p;
+
+	if (case_ctl_bufsize < size) {
+		case_ctl_bufsize = size;
+		case_ctl_buffer = xrealloc(case_ctl_buffer, case_ctl_bufsize);
+	}
+	memcpy(case_ctl_buffer, ptr, size);
+	switch (case_ctl) {
+	case ctl_upcase_next:
+		case_ctl_buffer[0] = toupper(case_ctl_buffer[0]);
+		break;
+
+	case ctl_locase_next:
+		case_ctl_buffer[0] = tolower(case_ctl_buffer[0]);
+		break;
+
+	case ctl_upcase:
+		for (p = case_ctl_buffer; p < case_ctl_buffer + size; p++)
+			*p = toupper(*p);
+		break;
+
+	case ctl_locase:
+		for (p = case_ctl_buffer; p < case_ctl_buffer + size; p++)
+			*p = tolower(*p);
+		break;
+
+	case ctl_stop:
+		break;
+	}
+	return case_ctl_buffer;
+}
+
+
+struct case_ctl_state {
+	enum case_ctl_type case_ctl;	/* Current case conversion op */
+	enum case_ctl_type save_ctl;	/* Saved case_ctl for \u and \l */
+};
+
+/* Reset case conversion after a single-char operation */
+static void
+case_ctl_reset(struct case_ctl_state *state)
+{
+	if (state->case_ctl == ctl_upcase_next
+	    || state->case_ctl == ctl_locase_next) {
+		state->case_ctl = state->save_ctl;
+		state->save_ctl = ctl_stop;
+	}
+}
+
+static void
+repl_loop(struct transform *tf, grecs_txtacc_t acc,
+	  const char *input,
+	  regmatch_t *rmp,
+	  struct case_ctl_state *state)
+{
+	const char *ptr;
+	struct replace_segm *segm;
+
+	for (segm = tf->repl_head; segm; segm = segm->next) {
+		switch (segm->type) {
+		case segm_literal:
+			/* Literal segment */
+			if (state->case_ctl == ctl_stop)
+				ptr = segm->v.literal.ptr;
+			else {
+				ptr = run_case_conv(state->case_ctl,
+						    segm->v.literal.ptr,
+						    segm->v.literal.size);
+				case_ctl_reset(state);
+			}
+			grecs_txtacc_grow(acc, ptr, segm->v.literal.size);
+			break;
+
+		case segm_backref:
+			/* Back-reference segment */
+			if (rmp[segm->v.ref].rm_so != -1
+			    && rmp[segm->v.ref].rm_eo != -1) {
+				size_t size = rmp[segm->v.ref].rm_eo -
+					      rmp[segm->v.ref].rm_so;
+				ptr = input + rmp[segm->v.ref].rm_so;
+				if (state->case_ctl != ctl_stop) {
+					ptr = run_case_conv(state->case_ctl,
+							    ptr, size);
+					case_ctl_reset(state);
+				}
+				grecs_txtacc_grow(acc, ptr, size);
+			}
+			break;
+
+		case segm_case_ctl:
+			switch (segm->v.ctl) {
+			case ctl_upcase_next:
+			case ctl_locase_next:
+				switch (state->save_ctl) {
+				case ctl_stop:
+				case ctl_upcase:
+				case ctl_locase:
+					state->save_ctl = state->case_ctl;
+				default:
+					break;
+				}
+				/*FALL THROUGH */
+				
+			case ctl_upcase:
+			case ctl_locase:
+			case ctl_stop:
+				state->case_ctl = segm->v.ctl;
+			}
+		}
+	}
+}
+
+void
+_single_transform_name_to_acc(struct transform *tf, grecs_txtacc_t acc,
+			      const char *input)
+{
+	regmatch_t *rmp;
+	int rc;
+	size_t nmatches = 0;
+	struct case_ctl_state ctl_state = { ctl_stop, ctl_stop };
+
+	rmp = xmalloc((tf->regex.re_nsub + 1) * sizeof(*rmp));
+
+	while (*input) {
+		size_t disp;
+
+		rc = regexec(&tf->regex, input, tf->regex.re_nsub + 1, rmp, 0);
+
+		if (rc == 0) {
+			disp = rmp[0].rm_eo;
+
+			if (rmp[0].rm_so)
+				grecs_txtacc_grow(acc, input, rmp[0].rm_so);
+
+			nmatches++;
+			if (tf->match_number && nmatches < tf->match_number) {
+				grecs_txtacc_grow(acc, input, disp);
+				input += disp;
+				continue;
+			}
+			repl_loop(tf, acc, input, rmp, &ctl_state);
+		} else {
+			disp = strlen(input);
+			grecs_txtacc_grow(acc, input, disp);
+		}
+
+		input += disp;
+
+		if (tf->transform_type == transform_first) {
+			grecs_txtacc_grow_string(acc, input);
+			break;
+		}
+	}
+
+	free(rmp);
+	grecs_txtacc_grow_char(acc, 0);
+}
+
+char *
+transform_string(TRANSFORM tf, const char *input)
+{
+	if (tf) {
+		grecs_txtacc_t acc = grecs_txtacc_create();
+		char *buf = NULL;
+
+		for (; tf; tf = tf->next) {
+			_single_transform_name_to_acc(tf, acc, input);
+			if (buf)
+				grecs_txtacc_free_string(acc, buf);
+			buf = grecs_txtacc_finish(acc, 0);
+			input = buf;
+		}
+		buf = xstrdup(buf);
+		grecs_txtacc_free(acc);
+		return buf;
+	}
+	return xstrdup(input);
+}
+
+char *
+transform_string_if_match(TRANSFORM tf, const char *input)
+{
+	int rc = regexec(&tf->regex, input, 0, NULL, 0);
+	if (rc == 0)
+		return transform_string(tf, input);
+	return NULL;
+}