2014-11-15 02:52:16 +08:00
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/* ABI compatibility for obsolete sigvec function from 4.2BSD.
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2016-01-05 00:05:18 +08:00
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Copyright (C) 1991-2016 Free Software Foundation, Inc.
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1997-06-24 05:55:26 +08:00
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This file is part of the GNU C Library.
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1995-02-18 09:27:10 +08:00
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1997-06-24 05:55:26 +08:00
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 12:58:11 +08:00
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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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1995-02-18 09:27:10 +08:00
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1997-06-24 05:55:26 +08:00
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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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2001-07-06 12:58:11 +08:00
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Lesser General Public License for more details.
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1995-02-18 09:27:10 +08:00
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2001-07-06 12:58:11 +08:00
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You should have received a copy of the GNU Lesser General Public
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2012-02-10 07:18:22 +08:00
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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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1995-02-18 09:27:10 +08:00
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2014-11-15 02:52:16 +08:00
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_21)
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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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/* These are the struct sigvec and SV_* bit definitions that
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used to be in <signal.h>. The whole interface now exists
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solely for ABI compatibility, so it can just be here. */
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struct sigvec
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{
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__sighandler_t sv_handler; /* Signal handler. */
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int sv_mask; /* Mask of signals to be blocked. */
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int sv_flags; /* Flags (see below). */
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};
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# define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
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# define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
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# define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
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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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# ifndef SA_RESETHAND
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/* When sigaction lacks the extension bit for it,
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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 (int sig) __THROW;
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static struct sigvec_wrapper_data sigvec_wrapper_data[NSIG];
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# endif
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1995-02-18 09:27:10 +08:00
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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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2014-11-15 02:52:16 +08:00
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__sigvec (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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# ifndef SA_RESETHAND
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if (vec == NULL || !(vec->sv_flags & SV_RESETHAND))
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# endif
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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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# ifdef SA_RESETHAND
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if (sv_flags & SV_RESETHAND)
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sa_flags |= SA_RESETHAND;
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# endif
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n = &new;
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new.sa_handler = handler;
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if (sigset_set_old_mask (&new.sa_mask, mask) < 0)
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return -1;
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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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# ifndef SA_RESETHAND
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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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# endif
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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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# ifndef SA_RESETHAND
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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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# else
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if (sa_flags & SA_RESETHAND)
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sv_flags |= SV_RESETHAND;
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# endif
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mask = sigset_get_old_mask (&old.sa_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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compat_symbol (libc, __sigvec, sigvec, GLIBC_2_0);
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# ifndef SA_RESETHAND
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static void
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2015-10-17 04:21:49 +08:00
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sigvec_wrapper_handler (int sig)
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1995-02-18 09:27:10 +08:00
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{
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2014-11-15 02:52:16 +08:00
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struct sigvec_wrapper_data *data;
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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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act.sa_handler = SIG_DFL;
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act.sa_flags = 0;
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sigset_set_old_mask (&act.sa_mask, data->sw_mask);
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handler = data->sw_handler;
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save = errno;
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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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1995-02-18 09:27:10 +08:00
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}
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2014-11-15 02:52:16 +08:00
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# endif /* No SA_RESETHAND. */
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1995-02-18 09:27:10 +08:00
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2014-11-15 02:52:16 +08:00
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#endif /* SHLIB_COMPAT */
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