mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
a1bdd81664
The main drive is to optimize the internal usage and required size when sigset_t is embedded in other data structures. On Linux, the current supported signal set requires up to 8 bytes (16 on mips), was lower than the user defined sigset_t (128 bytes). A new internal type internal_sigset_t is added, along with the functions to operate on it similar to the ones for sigset_t. The internal-signals.h is also refactored to remove unused functions Besides small stack usage on some functions (posix_spawn, abort) it lower the struct pthread by about 120 bytes (112 on mips). Checked on x86_64-linux-gnu. Reviewed-by: Arjun Shankar <arjun@redhat.com>
53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
/* BSD-like signal function.
|
|
Copyright (C) 1991-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <sigsetops.h>
|
|
#include <internal-signals.h>
|
|
|
|
sigset_t _sigintr attribute_hidden; /* Set by siginterrupt. */
|
|
|
|
/* Set the handler for the signal SIG to HANDLER,
|
|
returning the old handler, or SIG_ERR on error. */
|
|
__sighandler_t
|
|
__bsd_signal (int sig, __sighandler_t handler)
|
|
{
|
|
struct sigaction act, oact;
|
|
|
|
/* Check signal extents to protect __sigismember. */
|
|
if (handler == SIG_ERR || sig < 1 || sig >= NSIG
|
|
|| is_internal_signal (sig))
|
|
{
|
|
__set_errno (EINVAL);
|
|
return SIG_ERR;
|
|
}
|
|
|
|
act.sa_handler = handler;
|
|
__sigemptyset (&act.sa_mask);
|
|
__sigaddset (&act.sa_mask, sig);
|
|
act.sa_flags = __sigismember (&_sigintr, sig) ? 0 : SA_RESTART;
|
|
if (__sigaction (sig, &act, &oact) < 0)
|
|
return SIG_ERR;
|
|
|
|
return oact.sa_handler;
|
|
}
|
|
weak_alias (__bsd_signal, bsd_signal)
|
|
weak_alias (__bsd_signal, signal)
|
|
weak_alias (__bsd_signal, ssignal)
|