[thirdparty/glibc.git] / sysdeps / posix / pause.c

/* pause -- suspend the process until a signal arrives.  POSIX.1 version.
   Copyright (C) 2003-2015 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 <signal.h>
#include <unistd.h>
#include <sysdep-cancel.h>

/* Suspend the process until a signal arrives.
   This always returns -1 and sets errno to EINTR.  */

int
__libc_pause (void)
{
  sigset_t set;

  __sigemptyset (&set);
  __sigprocmask (SIG_BLOCK, NULL, &set);

  /* pause is a cancellation point, but so is sigsuspend.
     So no need for anything special here.  */

  return __sigsuspend (&set);
}
weak_alias (__libc_pause, pause)

LIBC_CANCEL_HANDLED ();		/* sigsuspend handles our cancellation.  */

#ifndef NO_CANCELLATION
# include <not-cancel.h>

int
__pause_nocancel (void)
{
  sigset_t set;

  __sigemptyset (&set);
  __sigprocmask (SIG_BLOCK, NULL, &set);

  return sigsuspend_not_cancel (&set);
}
#endif
Commit	Line	Data
	1	/* pause -- suspend the process until a signal arrives. POSIX.1 version.
	2	Copyright (C) 2003-2015 Free Software Foundation, Inc.
	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, see
	17	<http://www.gnu.org/licenses/>. */
	18
	19	#include <signal.h>
	20	#include <unistd.h>
	21	#include <sysdep-cancel.h>
	22
	23	/* Suspend the process until a signal arrives.
	24	This always returns -1 and sets errno to EINTR. */
	25
	26	int
	27	__libc_pause (void)
	28	{
	29	sigset_t set;
	30
	31	__sigemptyset (&set);
	32	__sigprocmask (SIG_BLOCK, NULL, &set);
	33
	34	/* pause is a cancellation point, but so is sigsuspend.
	35	So no need for anything special here. */
	36
	37	return __sigsuspend (&set);
	38	}
	39	weak_alias (__libc_pause, pause)
	40
	41	LIBC_CANCEL_HANDLED (); /* sigsuspend handles our cancellation. */
	42
	43	#ifndef NO_CANCELLATION
	44	# include <not-cancel.h>
	45
	46	int
	47	__pause_nocancel (void)
	48	{
	49	sigset_t set;
	50
	51	__sigemptyset (&set);
	52	__sigprocmask (SIG_BLOCK, NULL, &set);
	53
	54	return sigsuspend_not_cancel (&set);
	55	}
	56	#endif