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1998-02-11 14:39 Ulrich Drepper <drepper@happy.cygnus.com> * sysdeps/unix/sysv/linux/i386/sigaction.c (__libc_missing_rt_sigs): Rename from __libc_have_rt_sigs and leave as COMMON data.
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* POSIX.1 sigaction call for Linux/SPARC.
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Copyright (C) 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Miguel de Icaza (miguel@nuclecu.unam.mx), 1997.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <syscall.h>
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#include <sys/signal.h>
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#include <errno.h>
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/* The variable is shared between all wrappers around signal handling
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functions which have RT equivalents. */
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int __libc_missing_rt_sigs;
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/* Commented out while I figure out what the fuck goes on */
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long ____sig_table [NSIG];
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#if 0
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/* The kernel will deliver signals in the old way if the signal
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number is a positive number. The kernel will deliver a signal
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with the new stack layout if the signal number is a negative number.
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Our sigaction code takes care of selecting the type of kernel we are
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using at runtime. */
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extern void ____sparc_signal_trampoline (int);
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int
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__trampoline_sigaction (int sig, struct sigaction *new, struct sigaction *old)
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{
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int ret;
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int need_to_hide_trick = 0;
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__sighandler_t old_sh;
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if (new)
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{
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if (new->sa_handler != SIG_DFL && new->sa_handler != SIG_IGN)
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{
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old_sh = ____sig_table[sig];
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____sig_table[sig] = (long int) new->sa_handler;
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new->sa_handler = ____sparc_signal_trampoline;
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need_to_hide_trick = 1;
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}
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}
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__asm__("or %%g0,%0,%%g1\n\t"
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"or %%g0,%1,%%o0\n\t"
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"or %%g0,%2,%%o1\n\t"
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"or %%g0,%3,%%o2\n\t"
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"t 0x10\n\t"
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"bcc 1f\n\t"
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"or %%o0, %%g0, %0\n\t"
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"sub %%g0, %%o0, %0\n\t"
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"1:"
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: "=r" (ret), "=r" ((long int) sig), "=r" ((long int) new),
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"=r" ((long int) old)
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: "0" (__NR_sigaction), "1" (sig), "2" (new), "3" (old)
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: "g1", "o0", "o1", "o2");
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if (ret >= 0)
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{
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if (old && old->sa_handler == ____sparc_signal_trampoline)
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{
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if (need_to_hide_trick)
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old->sa_handler = old_sh;
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else
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old->sa_handler = ____sig_table[sig];
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}
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if (need_to_hide_trick)
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new->sa_handler = ____sig_table[sig];
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return 0;
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}
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__set_errno (-ret);
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return -1;
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}
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#else
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# define __new_sigaction __sigaction
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#endif
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int
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__new_sigaction (int sig, __const struct sigaction *new, struct sigaction *old)
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{
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int ret;
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sig = -sig;
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__asm__("or %%g0,%0,%%g1\n\t"
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"or %%g0,%1,%%o0\n\t"
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"or %%g0,%2,%%o1\n\t"
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"or %%g0,%3,%%o2\n\t"
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"t 0x10\n\t"
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"bcc 1f\n\t"
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"or %%o0, %%g0, %0\n\t"
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"sub %%g0,%%o0,%0\n\t"
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"1:"
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: "=r" (ret), "=r" ((long int) sig), "=r" ((long int) new),
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"=r" ((long int) old)
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: "0" (__NR_sigaction), "1" (sig), "2" (new), "3" (old)
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: "g1", "o0", "o1", "o2");
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if (ret >= 0)
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return 0;
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__set_errno (-ret);
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return -1;
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}
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#if 0
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int
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__sigaction (int sig, __const struct sigaction *new, struct sigaction *old)
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{
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static (*sigact_routine) (int, __const struct sigaction *, struct sigaction *);
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int ret;
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struct sigaction sa;
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if (sigact_routine)
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return (*sigact_routine) (sig, new, old);
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ret = __new_sigaction (1, NULL, &sa);
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if (ret == -1)
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sigact_routine = __trampoline_sigaction;
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else
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sigact_routine = __new_sigaction;
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return __sigaction (sig, new, old);
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}
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#endif
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weak_alias (__sigaction, sigaction);
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