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140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/* Copyright (C) 1997, 1998, 1999, 2000 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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#if __ASSUME_REALTIME_SIGNALS == 0
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/* The variable is shared between all wrappers around signal handling
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functions which have RT equivalents. This is the definition. */
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int __libc_missing_rt_sigs;
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extern int __syscall_sigaction (int, const struct old_kernel_sigaction *__unbounded,
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struct old_kernel_sigaction *__unbounded);
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#endif
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extern int __syscall_rt_sigaction (int, const struct kernel_sigaction *__unbounded,
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struct kernel_sigaction *__unbounded, size_t);
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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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#if __ASSUME_REALTIME_SIGNALS == 0
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struct old_kernel_sigaction k_sigact, k_osigact;
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#endif
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int result;
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#if defined __NR_rt_sigaction || __ASSUME_REALTIME_SIGNALS > 0
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/* First try the RT signals. */
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# if __ASSUME_REALTIME_SIGNALS == 0
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if (!__libc_missing_rt_sigs)
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# endif
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{
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struct kernel_sigaction kact, koact;
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/* Save the current error value for later. We need not do this
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if we are guaranteed to have realtime signals. */
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# if __ASSUME_REALTIME_SIGNALS == 0
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int saved_errno = errno;
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# endif
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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 (kernel_sigset_t));
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kact.sa_flags = act->sa_flags;
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# ifdef HAVE_SA_RESTORER
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kact.sa_restorer = act->sa_restorer;
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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 ? __ptrvalue (&kact) : NULL,
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oact ? __ptrvalue (&koact) : NULL,
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sizeof (kernel_sigset_t));
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# if __ASSUME_REALTIME_SIGNALS == 0
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if (result >= 0 || errno != ENOSYS)
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# endif
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{
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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,
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sizeof (kernel_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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# if __ASSUME_REALTIME_SIGNALS == 0
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__set_errno (saved_errno);
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__libc_missing_rt_sigs = 1;
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# endif
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}
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#endif
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#if __ASSUME_REALTIME_SIGNALS == 0
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if (act)
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{
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k_sigact.k_sa_handler = act->sa_handler;
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k_sigact.sa_mask = act->sa_mask.__val[0];
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k_sigact.sa_flags = act->sa_flags;
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# ifdef HAVE_SA_RESTORER
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k_sigact.sa_restorer = act->sa_restorer;
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# endif
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}
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result = INLINE_SYSCALL (sigaction, 3, sig,
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act ? __ptrvalue (&k_sigact) : NULL,
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oact ? __ptrvalue (&k_osigact) : NULL);
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if (oact && result >= 0)
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{
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oact->sa_handler = k_osigact.k_sa_handler;
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oact->sa_mask.__val[0] = k_osigact.sa_mask;
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oact->sa_flags = k_osigact.sa_flags;
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# ifdef HAVE_SA_RESTORER
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oact->sa_restorer = k_osigact.sa_restorer;
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# endif
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}
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return result;
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#endif
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}
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weak_alias (__libc_sigaction, __sigaction)
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weak_alias (__libc_sigaction, sigaction)
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