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.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <signal.h>
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#include <pthreadP.h>
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#include <sysdep.h>
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#include <shlib-compat.h>
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int
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__pthread_sigmask (int how, const sigset_t *newmask, sigset_t *oldmask)
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{
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sigset_t local_newmask;
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/* The only thing we have to make sure here is that SIGCANCEL and
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SIGSETXID is not blocked. */
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if (newmask != NULL
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&& (__glibc_unlikely (__sigismember (newmask, SIGCANCEL))
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|| __glibc_unlikely (__sigismember (newmask, SIGSETXID))))
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{
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local_newmask = *newmask;
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clear_internal_signals (&local_newmask);
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newmask = &local_newmask;
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}
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/* We know that realtime signals are available if NPTL is used. */
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int result = INTERNAL_SYSCALL_CALL (rt_sigprocmask, how, newmask,
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oldmask, __NSIG_BYTES);
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return (INTERNAL_SYSCALL_ERROR_P (result)
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? INTERNAL_SYSCALL_ERRNO (result)
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: 0);
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}
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libc_hidden_def (__pthread_sigmask)
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versioned_symbol (libc, __pthread_sigmask, pthread_sigmask, GLIBC_2_32);
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_32)
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strong_alias (__pthread_sigmask, __pthread_sigmask_2);
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compat_symbol (libc, __pthread_sigmask_2, pthread_sigmask, GLIBC_2_0);
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#endif
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