[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / pause.c

/* Linux pause syscall implementation.
   Copyright (C) 2017-2019 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
   <https://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)
{
#ifdef __NR_pause
  return SYSCALL_CANCEL (pause);
#else
  return SYSCALL_CANCEL (ppoll, NULL, 0, NULL, NULL);
#endif
}
weak_alias (__libc_pause, pause)
Commit	Line	Data
88499a87	1	/* Linux pause syscall implementation.
04277e02	2	Copyright (C) 2017-2019 Free Software Foundation, Inc.
a63c7fa1	3	This file is part of the GNU C Library.
a63c7fa1 CM	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
ab84e3ff	16	License along with the GNU C Library. If not, see
5a82c748	17	<https://www.gnu.org/licenses/>. */
a63c7fa1 CM	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. */
c6bb095e AZ	25	int
c6bb095e AZ	26	__libc_pause (void)
a63c7fa1	27	{
88499a87 AZ	28	#ifdef __NR_pause
	29	return SYSCALL_CANCEL (pause);
	30	#else
	31	return SYSCALL_CANCEL (ppoll, NULL, 0, NULL, NULL);
	32	#endif
a63c7fa1	33	}
a63c7fa1	34	weak_alias (__libc_pause, pause)