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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* Copyright (C) 1997-2014 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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<http://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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#include <kernel-features.h>
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/* The difference here is that the sigaction structure used in the
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kernel is not the same as we use in the libc. Therefore we must
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translate it here. */
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#include <kernel_sigaction.h>
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#define SA_RESTORER 0x04000000
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extern void __default_sa_restorer_v1(void);
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extern void __default_sa_restorer_v2(void);
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extern void __default_rt_sa_restorer_v1(void);
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extern void __default_rt_sa_restorer_v2(void);
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#ifdef __ASSUME_SIGFRAME_V2
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# define __default_sa_restorer __default_sa_restorer_v2
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# define __default_rt_sa_restorer __default_rt_sa_restorer_v2
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#else
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# include <ldsodefs.h>
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# define __default_sa_restorer (GLRO(dl_osversion) >= 0x020612 \
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? __default_sa_restorer_v2 \
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: __default_sa_restorer_v1)
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# define __default_rt_sa_restorer (GLRO(dl_osversion) >= 0x020612 \
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? __default_rt_sa_restorer_v2 \
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: __default_rt_sa_restorer_v1)
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#endif
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/* When RT signals are in use we need to use a different return stub. */
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#define choose_restorer(flags) \
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(flags & SA_SIGINFO) ? __default_rt_sa_restorer \
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: __default_sa_restorer
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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 (sig, act, oact)
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int sig;
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const struct sigaction *act;
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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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#ifdef HAVE_SA_RESTORER
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if (kact.sa_flags & SA_RESTORER)
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kact.sa_restorer = act->sa_restorer;
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else
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{
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kact.sa_restorer = choose_restorer (kact.sa_flags);
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kact.sa_flags |= SA_RESTORER;
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}
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#endif
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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 (rt_sigaction, 4, sig,
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act ? &kact : NULL,
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oact ? &koact : NULL, _NSIG / 8);
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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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#ifdef HAVE_SA_RESTORER
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oact->sa_restorer = koact.sa_restorer;
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#endif
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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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#ifdef WRAPPER_INCLUDE
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# include WRAPPER_INCLUDE
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#endif
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#ifndef LIBC_SIGACTION
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weak_alias (__libc_sigaction, __sigaction)
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libc_hidden_weak (__sigaction)
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weak_alias (__libc_sigaction, sigaction)
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#endif
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