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Handle activated child stdout/stderr correctly in systemd environment

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In systemd environment, dbus-daemon will run as no-fork mode since this
is the recommended practice of systemd.

In that scenario, child activated by dbus-daemon will inherit
dbus-daemon standard streams, includes stdin/stdout/stderr. stdin will
be redirected to /dev/null by systemd and stdout/stderr will be catched
by systemd log subsystem. Since the child inherit stdout/stderr from
dbus-daemon, so from systemd journal log, the child log output will be
identified with dbus-daemon identifier. So it's a little confusing.

This patch redirects the child stdout/stderr to systemd journal stream,
and with its owned service name as identifier. However, thing not fixed
perfectly due to the socket ucred of the child is owned by dbus-daemon,
so the pid isn't the real pid of the chile.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=68559
Reviewed-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
This commit is contained in:
Chengwei Yang 2013-10-15 13:27:51 +08:00 • committed by Simon McVittie
parent ec6ea1a6a8
commit 5be1e77829
2 changed files with 36 additions and 2 deletions
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2
configure.ac
View file

@ -1143,7 +1143,7 @@ if test x$enable_systemd = xno ; then
have_systemd=no;
else
PKG_CHECK_MODULES(SYSTEMD,
[libsystemd-login >= 32, libsystemd-daemon >= 32],
[libsystemd-login >= 32, libsystemd-daemon >= 32, libsystemd-journal >= 32],
have_systemd=yes,
have_systemd=no)
fi

36
dbus/dbus-spawn.c
View file

@ -38,6 +38,9 @@
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_SYSTEMD
#include <systemd/sd-journal.h>
#endif
extern char **environ;
@ -1197,6 +1200,10 @@ _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
int child_err_report_pipe[2] = { -1, -1 };
int babysitter_pipe[2] = { -1, -1 };
pid_t pid;
#ifdef HAVE_SYSTEMD
int fd_out = -1;
int fd_err = -1;
#endif
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
_dbus_assert (argv[0] != NULL);
@ -1283,7 +1290,13 @@ _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
}
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
#ifdef HAVE_SYSTEMD
/* this may fail, but not critical */
fd_out = sd_journal_stream_fd (sitter->log_name, LOG_INFO, FALSE);
fd_err = sd_journal_stream_fd (sitter->log_name, LOG_WARNING, FALSE);
#endif
pid = fork ();
if (pid < 0)
@ -1323,6 +1336,15 @@ _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
*/
signal (SIGPIPE, SIG_IGN);
#ifdef HAVE_SYSTEMD
/* log to systemd journal */
if (fd_out >= 0)
dup2 (fd_out, STDOUT_FILENO);
if (fd_err >= 0)
dup2 (fd_err, STDERR_FILENO);
close_and_invalidate (&fd_out);
close_and_invalidate (&fd_err);
#endif
do_exec (child_err_report_pipe[WRITE_END],
argv,
env,
@ -1331,6 +1353,10 @@ _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
}
else
{
#ifdef HAVE_SYSTEMD
close_and_invalidate (&fd_out);
close_and_invalidate (&fd_err);
#endif
babysit (grandchild_pid, babysitter_pipe[1]);
_dbus_assert_not_reached ("Got to code after babysit()");
}
@ -1340,6 +1366,10 @@ _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
/* Close the uncared-about ends of the pipes */
close_and_invalidate (&child_err_report_pipe[WRITE_END]);
close_and_invalidate (&babysitter_pipe[1]);
#ifdef HAVE_SYSTEMD
close_and_invalidate (&fd_out);
close_and_invalidate (&fd_err);
#endif
sitter->socket_to_babysitter = babysitter_pipe[0];
babysitter_pipe[0] = -1;
@ -1369,6 +1399,10 @@ _dbus_spawn_async_with_babysitter (DBusBabysitter **sitter_p,
close_and_invalidate (&child_err_report_pipe[WRITE_END]);
close_and_invalidate (&babysitter_pipe[0]);
close_and_invalidate (&babysitter_pipe[1]);
#ifdef HAVE_SYSTEMD
close_and_invalidate (&fd_out);
close_and_invalidate (&fd_err);
#endif
if (sitter != NULL)
_dbus_babysitter_unref (sitter);