| /* Copyright (C) 1991-2014 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 (sig, act, oact) |
| 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) |