mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 22:10:13 +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>
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/* Copyright (C) 2002-2022 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 <signal.h>
|
|
#include <pthreadP.h>
|
|
#include <sysdep.h>
|
|
#include <shlib-compat.h>
|
|
|
|
int
|
|
__pthread_sigmask (int how, const sigset_t *newmask, sigset_t *oldmask)
|
|
{
|
|
sigset_t local_newmask;
|
|
|
|
/* The only thing we have to make sure here is that SIGCANCEL and
|
|
SIGSETXID is not blocked. */
|
|
if (newmask != NULL
|
|
&& (__glibc_unlikely (__sigismember (newmask, SIGCANCEL))
|
|
|| __glibc_unlikely (__sigismember (newmask, SIGSETXID))))
|
|
{
|
|
local_newmask = *newmask;
|
|
clear_internal_signals (&local_newmask);
|
|
newmask = &local_newmask;
|
|
}
|
|
|
|
/* We know that realtime signals are available if NPTL is used. */
|
|
int result = INTERNAL_SYSCALL_CALL (rt_sigprocmask, how, newmask,
|
|
oldmask, __NSIG_BYTES);
|
|
|
|
return (INTERNAL_SYSCALL_ERROR_P (result)
|
|
? INTERNAL_SYSCALL_ERRNO (result)
|
|
: 0);
|
|
}
|
|
libc_hidden_def (__pthread_sigmask)
|
|
|
|
versioned_symbol (libc, __pthread_sigmask, pthread_sigmask, GLIBC_2_32);
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
|
|
strong_alias (__pthread_sigmask, __pthread_sigmask_2);
|
|
compat_symbol (libc, __pthread_sigmask_2, pthread_sigmask, GLIBC_2_0);
|
|
#endif
|