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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
166 lines
4.2 KiB
C
166 lines
4.2 KiB
C
/* Copyright (C) 1991, 92, 94, 95, 96, 97, 98 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 <signal.h>
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#include <errno.h>
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#include <stddef.h>
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/* Include macros to convert between `sigset_t' and old-style mask. */
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#include "sigset-cvt-mask.h"
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/* We use a wrapper handler to support SV_RESETHAND. */
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struct sigvec_wrapper_data
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{
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__sighandler_t sw_handler;
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unsigned int sw_mask;
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};
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static void sigvec_wrapper_handler __P ((int sig));
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static struct sigvec_wrapper_data sigvec_wrapper_data[NSIG];
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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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__sigvec (sig, vec, ovec)
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int sig;
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const struct sigvec *vec;
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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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__sighandler_t handler;
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unsigned int mask;
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unsigned int sv_flags;
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unsigned int sa_flags;
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handler = vec->sv_handler;
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mask = vec->sv_mask;
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sv_flags = vec->sv_flags;
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sa_flags = 0;
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if (sv_flags & SV_ONSTACK)
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{
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#ifdef SA_ONSTACK
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sa_flags |= SA_ONSTACK;
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#else
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__set_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 (!(sv_flags & SV_INTERRUPT))
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sa_flags |= SA_RESTART;
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#endif
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n = &new;
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new.sa_handler = handler;
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sigset_set_old_mask (&new.sa_mask, mask);
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new.sa_flags = sa_flags;
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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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__sighandler_t handler;
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unsigned int mask;
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struct sigvec_wrapper_data *data;
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struct sigaction wrapper;
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handler = vec->sv_handler;
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mask = (unsigned int)vec->sv_mask;
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data = &sigvec_wrapper_data[sig];
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wrapper.sa_handler = sigvec_wrapper_handler;
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/* FIXME: should we set wrapper.sa_mask, wrapper.sa_flags?? */
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data->sw_handler = handler;
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data->sw_mask = mask;
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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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__sighandler_t handler;
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unsigned int sv_flags;
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unsigned int sa_flags;
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unsigned int mask;
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handler = old.sa_handler;
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sv_flags = 0;
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sa_flags = old.sa_flags;
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if (handler == sigvec_wrapper_handler)
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{
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handler = sigvec_wrapper_data[sig].sw_handler;
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/* should we use data->sw_mask?? */
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sv_flags |= SV_RESETHAND;
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}
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sigset_get_old_mask (&old.sa_mask, mask);
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#ifdef SA_ONSTACK
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if (sa_flags & SA_ONSTACK)
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sv_flags |= SV_ONSTACK;
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#endif
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#ifdef SA_RESTART
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if (!(sa_flags & SA_RESTART))
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#endif
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sv_flags |= SV_INTERRUPT;
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ovec->sv_handler = handler;
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ovec->sv_mask = (int)mask;
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ovec->sv_flags = (int)sv_flags;
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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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static void
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sigvec_wrapper_handler (sig)
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int sig;
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{
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struct sigvec_wrapper_data *data;
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unsigned int mask;
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struct sigaction act;
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int save;
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__sighandler_t handler;
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data = &sigvec_wrapper_data[sig];
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mask = data->sw_mask;
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act.sa_handler = SIG_DFL;
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sigset_set_old_mask (&act.sa_mask, mask);
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act.sa_flags = 0;
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save = errno;
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handler = data->sw_handler;
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(void) __sigaction (sig, &act, (struct sigaction *) NULL);
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__set_errno (save);
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(*handler) (sig);
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}
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