mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 06:50:07 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library 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 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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 the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <hurd.h>
|
|
#include <hurd/signal.h>
|
|
|
|
/* If ACT is not NULL, change the action for SIG to *ACT.
|
|
If OACT is not NULL, put the old action for SIG in *OACT. */
|
|
int
|
|
__sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
|
|
{
|
|
struct hurd_sigstate *ss;
|
|
struct sigaction a, old;
|
|
sigset_t pending;
|
|
|
|
if (sig <= 0 || sig >= NSIG ||
|
|
(act != NULL && act->sa_handler != SIG_DFL &&
|
|
((__sigmask (sig) & _SIG_CANT_MASK) ||
|
|
act->sa_handler == SIG_ERR)))
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/* Copy so we fault before taking locks. */
|
|
if (act != NULL)
|
|
a = *act;
|
|
|
|
ss = _hurd_self_sigstate ();
|
|
|
|
__spin_lock (&ss->critical_section_lock);
|
|
__spin_lock (&ss->lock);
|
|
old = ss->actions[sig];
|
|
if (act != NULL)
|
|
ss->actions[sig] = a;
|
|
|
|
if (act != NULL && sig == SIGCHLD &&
|
|
(a.sa_flags & SA_NOCLDSTOP) != (old.sa_flags & SA_NOCLDSTOP))
|
|
{
|
|
__spin_unlock (&ss->lock);
|
|
|
|
/* Inform the proc server whether or not it should send us SIGCHLD for
|
|
stopped children. We do this in a critical section so that no
|
|
SIGCHLD can arrive in the middle and be of indeterminate status. */
|
|
__USEPORT (PROC,
|
|
__proc_mod_stopchild (port, !(a.sa_flags & SA_NOCLDSTOP)));
|
|
|
|
__spin_lock (&ss->lock);
|
|
pending = ss->pending & ~ss->blocked;
|
|
}
|
|
else if (act != NULL && (a.sa_handler == SIG_IGN || a.sa_handler == SIG_DFL))
|
|
/* We are changing to an action that might be to ignore SIG signals.
|
|
If SIG is blocked and pending and the new action is to ignore it, we
|
|
must remove it from the pending set now; if the action is changed
|
|
back and then SIG is unblocked, the signal pending now should not
|
|
arrive. So wake up the signal thread to check the new state and do
|
|
the right thing. */
|
|
pending = ss->pending & __sigmask (sig);
|
|
else
|
|
pending = 0;
|
|
|
|
__spin_unlock (&ss->lock);
|
|
__spin_unlock (&ss->critical_section_lock);
|
|
|
|
if (pending)
|
|
__msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
|
|
|
|
if (oact != NULL)
|
|
*oact = old;
|
|
|
|
return 0;
|
|
}
|
|
libc_hidden_def (__sigaction)
|
|
weak_alias (__sigaction, sigaction)
|