1 files changed, 56 insertions, 2 deletions
diff --git a/src/genrc.8 b/src/genrc.8
index 00522ee..959a00e 100644
--- a/src/genrc.8
+++ b/src/genrc.8
@@ -13,7 +13,7 @@
 .\"
 .\" You should have received a copy of the GNU General Public License
 .\" along with genrc.  If not, see <http://www.gnu.org/licenses/>. 
-.TH GENRC 8 "May 17, 2018" "GENRC" "Genrc User Manual"
+.TH GENRC 8 "May 20, 2018" "GENRC" "Genrc User Manual"
 .SH NAME
 genrc \- generic system initialization script helper
 .SH SYNOPSIS
@@ -36,6 +36,8 @@ genrc \- generic system initialization script helper
  [\fB\-\-pid\-from=\fISOURCE\fR]\
  [\fB\-\-pidfile=\fIPIDFILE\fR]\
  [\fB\-\-program=\fIPROGRAM\fR]\
+ [\fB\-\-restart\-on\-exit=\fR[\fB!\fR]\fISTATUS\fR[\fB,\fISTATUS\fR...]]\
+ [\fB\-\-restart\-on\-signal=\fR[\fB!\fR]\fISIG\fR[\fB,\fISIG\fR...]]\
  [\fB\-\-sentinel\fR]\
  [\fB\-\-signal\-reload=\fISIG\fR]\
  [\fB\-\-signal\-stop=\fISIG\fR]\
@@ -101,6 +103,30 @@ If the \fB\-\-create\-pidfile=\fIFILENAME\fR option is given together with
 in \fIFILE\fR. The file will be unlinked after the subsidiary command
 terminates. Unless the \fB\-\-pid\-from\fR option is given,
 \fB\-\-pid\-from=FILE:\fIFILENAME\fR will be assumed.
+.PP
+In sentinel mode, it is possible to restart the program if it
+terminates with a specific exit code or on a specific signal. This is
+controlled by the \fB\-\-restart\-on\-exit\fR and 
+\fB\-\-restart\-on\-signal\fR options. Use this feature to ensure the
+service provided by the program won't get terminated because of
+hitting a bug or encountering an unforeseen external condition. For
+example, the following two options will ensure that the program will
+be terminated only if it exits with status 0 or it is terminated by
+SIGTERM or SIGQUIT signal:
+.EX
+--restart-on-exit='!0' --restart-on-signal='!TERM,QUIT'
+.EE
+.PP
+If restarts are requested, \fBgenrc\fR will control how often it has
+to restart the program using the same algorithm as
+.B init (8).
+Namely, if the program is restarted more than 10 times within two
+minutes, \fBgenrc\fR will disable subsequent restarts for the next
+5 minutes. If the \fB\-\-create\-pidfile\fR option was used, the
+PID of the controlling \fBgenrc\fR process will be stored in the
+file during that interval. If the \fBSIGHUP\fR signal is delivered
+during the sleep interval, the sleep will be broken prematurely and
+the program restarted again.
 .SS status
 In \fBstatus\fR mode \fBgenrc\fR verifies if the \fICOMMAND\fR is
 already running and outputs its status on the standard output. To this
@@ -188,9 +214,37 @@ Name of the program to run.
 \fB\-P\fR, \fB\-\-pid\-from=\fISOURCE\fR
 Where to look for PIDs of the running programs.
 .TP
+\fB\-\-restart\-on\-exit=\fR[\fB!\fR]\fISTATUS\fR[\fB,\fISTATUS\fR...]
+This option takes effect when used together with
+\fB\-\-sentinel\fR. If the program terminates with one of status
+codes listed as the argument to this option, it will be immediately
+restarted. The exclamation mark at the start of the list inverts the
+set, e.g. \fB\-\-restart\-on\-exit='!0,1'\fR means restart unless the
+program exit code is 0 or 1. Note the use of quotation to prevent the
+\fB!\fR from being interpreted by the shell.
+.TP
+\fB\-\-restart\-on\-signal=\fR[\fB!\fR]\fISIG\fR[\fB,\fISIG\fR...]
+This option takes effect when used together with
+\fB\-\-sentinel\fR. If the program terminates due to receiving one of
+the signals from this list, it will be immediately restarted. Each
+\fISIG\fR is either a signal number, or a signal name, as listed in
+.BR signal (7).
+The \fBSIG\fR prefix can be omitted from the signal name. Names are
+case-insensitive. Thus, \fB1\fR, \fBHUP\fR, \fBSIGHUP\fR, and
+\fBsighup\fR all stand for the same signal.
+.sp
+The exclamation mark at the start of the list complements the signal
+set, so that e.g. \fB\-\-restart\-on\-signal='!TERM,QUIT,INT'\fR will
+restart the program unless it terminates on one of the listed signals.
+.TP
 \fB\-\-sentinel\fR
 \fIPROGRAM\fR runs in foreground; disconnect from the controlling
-terminal, run it and act as a sentinel.
+terminal, start it and run in background until it terminates. The
+program's stdout and stderr are sent to the syslog facility
+\fBdaemon\fR, priorities \fBinfo\fR and \fBerr\fR, correspondingly.
+
+See the options \fB\-\-restart\-on\-exit\fR and
+\fB\-\-restart\-on\-signal\fR for details on how to restart the program.
 .TP
 \fB\-\-signal\-reload=\fISIG\fR
 Signal to send on reload (default: \fBSIGHUP\fR). Setting it to 0 is