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a894053318
The generic implementation basically handle the system agnostic logic (filtering out the invalid signals) while the __libc_sigaction is the function with implements the system and architecture bits. Checked on x86_64-linux-gnu and i686-linux-gnu.
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* Copyright (C) 1997-2021 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 <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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/* New ports should not define the obsolete SA_RESTORER, however some
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architecture requires for compat mode and/or due old ABI. */
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#include <kernel_sigaction.h>
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#ifndef SA_RESTORER
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# define SET_SA_RESTORER(kact, act)
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# define RESET_SA_RESTORER(act, kact)
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#endif
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/* SPARC passes the restore function as an argument to rt_sigaction. */
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#ifndef STUB
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# define STUB(act, sigsetsize) (sigsetsize)
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#endif
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/* If ACT is not NULL, change the action for SIG to *ACT.
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If OACT is not NULL, put the old action for SIG in *OACT. */
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int
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__libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
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{
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int result;
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struct kernel_sigaction kact, koact;
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if (act)
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{
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kact.k_sa_handler = act->sa_handler;
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memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t));
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kact.sa_flags = act->sa_flags;
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SET_SA_RESTORER (&kact, act);
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}
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/* XXX The size argument hopefully will have to be changed to the
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real size of the user-level sigset_t. */
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result = INLINE_SYSCALL_CALL (rt_sigaction, sig,
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act ? &kact : NULL,
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oact ? &koact : NULL, STUB (act,
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__NSIG_BYTES));
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if (oact && result >= 0)
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{
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oact->sa_handler = koact.k_sa_handler;
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memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t));
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oact->sa_flags = koact.sa_flags;
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RESET_SA_RESTORER (oact, &koact);
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}
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return result;
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}
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libc_hidden_def (__libc_sigaction)
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