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sysdeps: Only use closefrom() if known to be async-signal-safe

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closefrom() is known to be async-signal-safe on FreeBSD, NetBSD and
OpenBSD, and safe to call after fork() on Solaris, but not necessarily
on DragonflyBSD.

Signed-off-by: Simon McVittie <smcv@collabora.com>
This commit is contained in:
Simon McVittie 2022-03-01 19:12:38 +00:00
parent 54c62040b2
commit faa3b2ef4a
1 changed files with 9 additions and 1 deletions
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10
dbus/dbus-sysdeps-unix.c
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@ -4796,7 +4796,15 @@ act_on_fds_3_and_up (void (*func) (int fd))
void
_dbus_close_all (void)
{
#ifdef HAVE_CLOSEFROM
/* Some library implementations of closefrom() are not async-signal-safe,
* and we call _dbus_close_all() after forking, so we only do this on
* operating systems where we know that closefrom() is a system call */
#if defined(HAVE_CLOSEFROM) && ( \
defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__OpenBSD__) || \
defined(__sun__) && defined(F_CLOSEFROM) \
)
closefrom (3);
#else
act_on_fds_3_and_up (close_ignore_error);