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/* sigaction.c - Generic sigaction implementation.
Copyright (C) 2008 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 3 of
the License, or (at your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program. If not, see
<http://www.gnu.org/licenses/>. */
#include "sig-internal.h"
#include "pt-internal.h"
int
sigaction (int sig, const struct sigaction *restrict sa,
struct sigaction *restrict osa)
{
if (sig <= 0 || sig >= NSIG)
{
errno = EINVAL;
return -1;
}
struct signal_state *ss = &_pthread_self ()->ss;
pthread_mutex_lock (&ss->lock);
if (osa)
*osa = ss->actions[sig - 1];
if (sa)
{
ss->actions[sig - 1] = *sa;
/* "The SIGKILL and SIGSTOP signals shall not be added to the
signal mask using this mechanism; this restriction shall be
enforced by the system without causing an error to be
indicated" (sigaction). */
sigdelset (&ss->blocked, SIGKILL);
sigdelset (&ss->blocked, SIGSTOP);
/* A "signal shall remain pending on the process until it is
unblocked, it is accepted when ..., or the action associated
with it is set to ignore the signal" (2.4.1).
"Setting a signal action to SIG_DFL for a signal that is
pending, and whose default action is to ignore the signal,
..., shall cause the pending signal to be discarded, whether
or not it is blocked" (2.4.3). */
if (sa->sa_handler == SIG_IGN
|| (sa->sa_handler == SIG_DFL && default_action (sig) == sig_ignore))
{
sigdelset (&ss->pending, sig);
sigdelset (&process_pending, sig);
}
}
pthread_mutex_unlock (&ss->lock);
return 0;
}
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