163 lines
3.8 KiB
C
163 lines
3.8 KiB
C
/* Copyright (C) 1991, 1992, 1994, 1995 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 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <signal.h>
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#include <errno.h>
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#include <stddef.h>
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/* We use a wrapper handler to support SV_RESETHAND. */
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static __sighandler_t wrapped_handlers[NSIG];
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static sigset_t wrapped_masks[NSIG];
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static void
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DEFUN(wrapper_handler, (sig), int sig)
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{
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int save;
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struct sigaction act;
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act.sa_handler = SIG_DFL;
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act.sa_mask = wrapped_masks[sig];
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act.sa_flags = 0;
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save = errno;
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(void) __sigaction(sig, &act, (struct sigaction *) NULL);
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errno = save;
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(*wrapped_handlers[sig])(sig);
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}
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static
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#ifdef __GNUC__
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inline
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#endif
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int
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DEFUN(convert_mask, (set, mask), sigset_t *set AND CONST int mask)
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{
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register int sig;
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if (sizeof(*set) == sizeof(mask))
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{
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*(int *) set = mask;
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return 0;
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}
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if (__sigemptyset(set) < 0)
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return -1;
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for (sig = 1; sig < NSIG; ++sig)
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if (mask & sigmask(sig))
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if (__sigaddset(set, sig) < 0)
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return -1;
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return 0;
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}
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/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
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of VEC. The signals in `sv_mask' will be blocked while the handler runs.
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If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
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reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
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it is filled in with the old information for SIG. */
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int
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DEFUN(__sigvec, (sig, vec, ovec),
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int sig AND CONST struct sigvec *vec AND struct sigvec *ovec)
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{
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struct sigaction old;
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if (vec == NULL || !(vec->sv_flags & SV_RESETHAND))
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{
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struct sigaction new, *n;
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if (vec == NULL)
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n = NULL;
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else
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{
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n = &new;
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n->sa_handler = vec->sv_handler;
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if (convert_mask (&n->sa_mask, vec->sv_mask) < 0)
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return -1;
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n->sa_flags = 0;
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if (vec->sv_flags & SV_ONSTACK)
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{
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#ifdef SA_ONSTACK
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n->sa_flags |= SA_ONSTACK;
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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#ifdef SA_RESTART
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if (!(vec->sv_flags & SV_INTERRUPT))
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n->sa_flags |= SA_RESTART;
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#endif
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}
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if (__sigaction (sig, n, &old) < 0)
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return -1;
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}
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else
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{
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struct sigaction wrapper;
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wrapper.sa_handler = wrapper_handler;
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wrapped_handlers[sig] = vec->sv_handler;
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if (convert_mask (&wrapped_masks[sig], vec->sv_mask) < 0)
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return -1;
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if (__sigaction (sig, &wrapper, &old) < 0)
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return -1;
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}
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if (ovec != NULL)
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{
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register int i;
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int mask = 0;
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if (sizeof (int) == sizeof (sigset_t))
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mask = *(int *) &old.sa_mask;
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else
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for (i = 1; i < NSIG; ++i)
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if (__sigismember(&old.sa_mask, i))
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mask |= sigmask(i);
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ovec->sv_mask = mask;
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ovec->sv_flags = 0;
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#ifdef SA_ONSTACK
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if (old.sa_flags & SA_ONSTACK)
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ovec->sv_flags |= SV_ONSTACK;
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#endif
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#ifdef SA_RESTART
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if (!(old.sa_flags & SA_RESTART))
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#endif
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ovec->sv_flags |= SV_INTERRUPT;
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if (old.sa_handler == wrapper_handler)
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{
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ovec->sv_flags |= SV_RESETHAND;
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ovec->sv_handler = wrapped_handlers[sig];
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}
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else
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ovec->sv_handler = old.sa_handler;
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}
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return 0;
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}
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weak_alias (__sigvec, sigvec)
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