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glog: fix crash on Linux without stderr stream

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0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
1  0xb67c43f0 in __GI_abort () at abort.c:89
2  0xb69ee9d8 in _g_log_abort (breakpoint=2, breakpoint@entry=1) at gmessages.c:548
3  0xb69ef692 in g_logv (log_domain=0xb6a1dfc8 "GLib", log_level=-1254563840, log_level@entry=G_LOG_LEVEL_CRITICAL, format=format@entry=0xb6a26a48 "%s: assertion '%s' failed", args=..., args@entry=...) at gmessages.c:1357
4  0xb69ef728 in g_log (log_domain=<optimized out>, log_level=log_level@entry=G_LOG_LEVEL_CRITICAL, format=0xb6a26a48 "%s: assertion '%s' failed") at gmessages.c:1398
5  0xb69efa5a in g_return_if_fail_warning (log_domain=<optimized out>, pretty_function=<optimized out>, expression=<optimized out>) at gmessages.c:2687
6  0xb69efe7c in g_log_writer_is_journald (output_fd=-1) at gmessages.c:2122
7  0xb69f02a2 in g_log_writer_default (log_level=G_LOG_LEVEL_CRITICAL, fields=0xbedc9d00, n_fields=4, user_data=0x0) at gmessages.c:2584
8  0xb69ef21a in g_log_structured_array (log_level=G_LOG_LEVEL_CRITICAL, fields=0xbedc9d00, n_fields=4) at gmessages.c:1933
9  0xb69ef47e in g_log_default_handler (log_domain=0xb6a1dfc8 "GLib", log_level=G_LOG_LEVEL_CRITICAL, message=<optimized out>, unused_data=<optimized out>) at gmessages.c:3036
10 0xb69ef5fc in g_logv (log_domain=0xb6a1dfc8 "GLib", log_level=log_level@entry=G_LOG_LEVEL_CRITICAL, format=format@entry=0xb6a26a48 "%s: assertion '%s' failed", args=..., args@entry=...) at gmessages.c:1336
11 0xb69ef728 in g_log (log_domain=<optimized out>, log_level=log_level@entry=G_LOG_LEVEL_CRITICAL, format=0xb6a26a48 "%s: assertion '%s' failed") at gmessages.c:1398
12 0xb69efa5a in g_return_if_fail_warning (log_domain=<optimized out>, pretty_function=<optimized out>, expression=<optimized out>) at gmessages.c:2687

If stderr is not associated with an output stream, the fileno(stderr) returned is -1.
So, g_return_if_fail_warning is recursively called and the abort occurs on the second call.

Modified by Philip Withnall to include mention this in the
documentation.

https://bugzilla.gnome.org/show_bug.cgi?id=786452
This commit is contained in:
INSUN PYO 2017-08-18 13:42:44 +09:00 committed by Philip Withnall
parent 54aee1f627
commit 15faf0ef62
1 changed files with 8 additions and 1 deletions
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9
glib/gmessages.c
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@ -2114,6 +2114,12 @@ open_journal (void)
* systemd journal, or something else (like a log file or `stdout` or * systemd journal, or something else (like a log file or `stdout` or
* `stderr`). * `stderr`).
* *
* Invalid file descriptors are accepted and return %FALSE, which allows for
* the following construct without needing any additional error handling:
* |[<!-- language="C" -->
* is_journald = g_log_writer_is_journald (fileno (stderr));
* ]|
*
* Returns: %TRUE if @output_fd points to the journal, %FALSE otherwise * Returns: %TRUE if @output_fd points to the journal, %FALSE otherwise
* Since: 2.50 * Since: 2.50
*/ */
@ -2127,7 +2133,8 @@ g_log_writer_is_journald (gint output_fd)
static gsize initialized; static gsize initialized;
static gboolean fd_is_journal = FALSE; static gboolean fd_is_journal = FALSE;
g_return_val_if_fail (output_fd >= 0, FALSE); if (output_fd < 0)
return FALSE;
if (g_once_init_enter (&initialized)) if (g_once_init_enter (&initialized))
{ {