start-stop-daemon: add ability to log stdout or stderr to processes

man/openrc-run.8

@@ -173,6 +173,23 @@ variable is set.
 The same thing as
 .Pa output_log
 but for the standard error output.
+.It Ar output_logger
+This is a process which will be used to log the standard output from the
+service.  If you are starting this service with
+.Xr start-stop-daemon 8 ,
+,  you must set
+.Pa command_background
+to true. Keep in mind that this command must be executable as a shell
+command inside the chroot if the
+.Pa chroot
+variable is set. Keep in mind also that this command works by accepting
+the stdout of the service on stdin.
+An example of a command that can be run this way is logger if you want
+your service output to go to syslog.
+.It Ar error_logger
+The same thing as
+.Pa output_logger
+but for the standard error output.
 .It Ar directory
 .Xr start-stop-daemon 8
 and

man/start-stop-daemon.8

@@ -131,9 +131,34 @@ Modifies the scheduling priority of the daemon.
 .It Fl 1 , -stdout Ar logfile
 Redirect the standard output of the process to logfile when started with
 .Fl background .
-Must be an absolute pathname, but relative to the path optionally given with
+The logfile Must be an absolute pathname, but relative to the path
+optionally given with
 .Fl r , -chroot .
 The logfile can also be a named pipe.
+.It Fl 2 , -stderr Ar logfile
+Redirect the standard error of the process to logfile when started with
+.Fl background .
+The logfile must be an absolute pathname, but relative to the path
+optionally given with
+.Fl r , -chroot .
+The logfile can also be a named pipe.
+.It Fl 3 , -stdout-logger Ar cmd
+Run cmd as a child process redirecting the standard output to the
+standard input of cmd when started with
+.Fl background .
+Cmd must be an absolute pathname, but relative to the path optionally given with
+.Fl r , -chroot .
+This process must be prepared to accept input on stdin and be able to
+log it or send it to another location.
+.It Fl 4 , -stderr-logger Ar cmd
+Run cmd as a child process and 
+Redirect the standard error of the process to the standard input of cmd
+when started with
+.Fl background .
+Cmd must be an absolute pathname, but relative to the path optionally given with
+.Fl r , -chroot .
+This process must be prepared to accept input on stdin and be able to
+log it or send it to another location.
 .It Fl w , -wait Ar milliseconds
 Wait
 .Ar milliseconds