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- /* Copyright (C) 1991, 1992 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <ansidecl.h>
- #include <errno.h>
- #include <signal.h>
- #include <hurd.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
- DEFUN(__sigaction, (sig, act, oact),
- int sig AND CONST struct sigaction *act AND struct sigaction *oact)
- {
- struct _hurd_sigstate *ss;
- struct sigaction a, old;
-
- if (sig <= 0 || sig >= NSIG ||
- (act != NULL && act->sa_handler != SIG_DFL &&
- ((__sigmask (sig) & _SIG_CANT_IGNORE) ||
- act->sa_handler == SIG_ERR)))
- {
- errno = EINVAL;
- return -1;
- }
-
- /* Copy so we fault before taking locks. */
- if (act != NULL)
- a = *act;
-
- ss = _hurd_thread_sigstate (__mach_thread_self ());
-
- if (sig == SIGCHLD && act != NULL)
- __proc_mark_nostopchild (_hurd_proc, a.sa_flags & SA_NOCLDSTOP);
-
- old = ss->actions[sig];
-
- if (act != NULL)
- ss->actions[sig] = a;
-
- __mutex_unlock (&ss->lock);
-
- if (oact != NULL)
- *oact = old;
-
- return 0;
- }
-