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ShellApp: Connect applications to systemd journal (if available)

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Systemd-for-the-user-session would also do this, but that's a deeply
invasive change that I may not actually get to this cycle.  This
change is tiny and non-invasive, but provides an important benefit:
You can actually reliably tell *which* applications are logging which
messages (assuming they're launched by the shell).

This actually complements a recent change in DBus:
See https://bugs.freedesktop.org/show_bug.cgi?id=68559
which does a similar thing for bus activated apps.

https://bugzilla.gnome.org/show_bug.cgi?id=711626
This commit is contained in:
Colin Walters
2013-11-07 12:34:57 -05:00
parent 52b1a1b835
commit 213ee8d381
2 changed files with 51 additions and 0 deletions
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33
src/shell-app.c
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@ -17,6 +17,12 @@
#include "st.h"
#include "gtkactionmuxer.h"
#ifdef HAVE_SYSTEMD
#include <systemd/sd-journal.h>
#include <errno.h>
#include <unistd.h>
#endif
typedef enum {
MATCH_NONE,
MATCH_SUBSTRING, /* Not prefix, substring */
@ -1161,6 +1167,29 @@ _gather_pid_callback (GDesktopAppInfo *gapp,
app);
}
#ifdef HAVE_SYSTEMD
/* This sets up the launched application to log to the journal
* using its own identifier, instead of just "gnome-session".
*/
static void
app_child_setup (gpointer user_data)
{
const char *appid = user_data;
int res;
int journalfd = sd_journal_stream_fd (appid, LOG_INFO, FALSE);
if (journalfd >= 0)
{
do
res = dup2 (journalfd, 1);
while (G_UNLIKELY (res == -1 && errno == EINTR));
do
res = dup2 (journalfd, 2);
while (G_UNLIKELY (res == -1 && errno == EINTR));
(void) close (journalfd);
}
}
#endif
/**
* shell_app_launch:
* @timestamp: Event timestamp, or 0 for current event timestamp
@ -1203,7 +1232,11 @@ shell_app_launch (ShellApp *app,
ret = g_desktop_app_info_launch_uris_as_manager (app->info, NULL,
G_APP_LAUNCH_CONTEXT (context),
G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD,
#ifdef HAVE_SYSTEMD
app_child_setup, (gpointer)shell_app_get_id (app),
#else
NULL, NULL,
#endif
_gather_pid_callback, app,
error);
g_object_unref (context);