supervise-daemon: implement output_logger and error_logger.

Allows redirecting process stdin and stdout to another process,
just like is already possible with start-stop-daemon.

Also added --stdout-logger and --stderr-logger to the man page.

1 files changed, 17 insertions, 0 deletions

diff --git a/man/supervise-daemon.8 b/man/supervise-daemon.8
index cd76beb2..c3a6e9f7 100644
--- a/man/supervise-daemon.8
+++ b/man/supervise-daemon.8
@@ -158,6 +158,23 @@ The logfile can also be a named pipe.
 The same thing as
 .Fl 1 , -stdout
 but with the standard error output.
+.It Fl -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 -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 -capabilities Ar cap-list
 Start the daemon with the listed inheritable, ambient and bounding capabilities.
 The format is the same as in cap_iab(3).