Sentinel mode: restart the program on certain conditions

* Makefile.am: Create the ChangeLog file from git log.
* configure.ac: Request git2chg
* src/com_start.c: Use sigaction instead of signal.
* src/genrc.8: Document new options.
* src/genrc.c: New options --restart-on-exit and --restart-on-signal.
* src/genrc.h (str_to_sig, str_to_int): New prototypes.
(add_restart_condition): New prototype.
* src/sentinel.c (restart_on, add_restart_condition):
(check_failure_rate): New functions.
(wait_loop): Return if restart is requested.
(sentinel): Restart the program if needed.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/com_start.c b/src/com_start.c
index 5744e39..3a9dffc 100644
--- a/src/com_start.c
+++ b/src/com_start.c
@@ -40,15 +40,19 @@ sigchld(int sig)
 
 int
 timedwaitpid(pid_t pid, int *status)
 {
         struct timeval now, stoptime, ttw;
         int rc = -1;
-        SIGHANDLER oldsig;
+        struct sigaction act, oldact;
+
+        act.sa_handler = sigchld;
+        act.sa_flags = 0;
+        sigemptyset(&act.sa_mask);
+        sigaction(SIGCHLD, &act, &oldact);
 
-        oldsig = signal(SIGCHLD, sigchld);
         gettimeofday(&stoptime, NULL);
         stoptime.tv_sec += genrc_timeout;
         while (1) {
                 pid_t p;
                 
                 p = waitpid(pid, status, WNOHANG);
@@ -70,13 +74,13 @@ timedwaitpid(pid_t pid, int *status)
                                 system_error(errno, "select");
                                 break;
                         }
                 }
 
         }
-        signal(SIGCHLD, oldsig);
+        sigaction(SIGCHLD, &oldact, NULL);
         if (rc) {
                 kill(pid, SIGKILL);
         }
         return rc;
 }