uclibc-ng/libc/sysdeps/linux/common/sigsuspend.c

/* vi: set sw=4 ts=4: */
/*
 * sigsuspend() for uClibc
 *
 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include <sys/syscall.h>

#if defined __USE_POSIX
#include <signal.h>
#undef sigsuspend

libc_hidden_proto(sigsuspend)

#ifdef __NR_rt_sigsuspend
# define __NR___rt_sigsuspend __NR_rt_sigsuspend

# ifdef __UCLIBC_HAS_THREADS_NATIVE__
#  include <errno.h>
#  include <sysdep-cancel.h>

/* Change the set of blocked signals to SET,
   wait until a signal arrives, and restore the set of blocked signals.  */
int sigsuspend (const sigset_t *set)
{
	if (SINGLE_THREAD_P)
		return INLINE_SYSCALL (rt_sigsuspend, 2, set, _NSIG / 8);

	int oldtype = LIBC_CANCEL_ASYNC ();

	int result = INLINE_SYSCALL (rt_sigsuspend, 2, set, _NSIG / 8);

	LIBC_CANCEL_RESET (oldtype);

	return result;
}
# else
static inline _syscall2(int, __rt_sigsuspend, const sigset_t *, mask, size_t, size);

int sigsuspend(const sigset_t * mask)
{
	return __rt_sigsuspend(mask, _NSIG / 8);
}
# endif
#else
# define __NR___syscall_sigsuspend __NR_sigsuspend
static __inline__ _syscall3(int, __syscall_sigsuspend, int, a, unsigned long int, b,
		  unsigned long int, c)

int sigsuspend(const sigset_t * set)
{
	return __syscall_sigsuspend(0, 0, set->__val[0]);
}
#endif
libc_hidden_def(sigsuspend)
#endif