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dbus-spawn-unix: If a fd is not close-on-exec, look it up in /proc/self/fd

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In operating systems where /proc/self/fd works like it does on Linux
(Linux itself, and FreeBSD with Linux /proc emulation) this will give
us a clue about the fd that was leaked or opened incorrectly.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2018-11-20 17:32:02 +00:00
parent cdcf3c04dd
commit ebf487ef03
1 changed files with 16 additions and 1 deletions
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17
dbus/dbus-spawn-unix.c
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@ -1063,7 +1063,22 @@ do_exec (int child_err_report_fd,
retval = fcntl (i, F_GETFD);
if (retval != -1 && !(retval & FD_CLOEXEC))
_dbus_warn ("Fd %d did not have the close-on-exec flag set!", i);
{
char description[256] = { 0 };
char proc_self_fd[256] = { 0 };
size_t description_length = sizeof (description) - 1;
snprintf (proc_self_fd, sizeof (proc_self_fd) - 1,
"/proc/self/fd/%d", i);
proc_self_fd[sizeof (proc_self_fd) - 1] = '\0';
if (readlink (proc_self_fd, description, description_length) <= 0)
snprintf (description, sizeof (description) - 1, "(unknown)");
description[sizeof (description) - 1] = '\0';
_dbus_warn ("Fd %d \"%s\" did not have the close-on-exec flag set!",
i, description);
}
}
#endif