uclibc-ng/libc/sysdeps/linux/xtensa/sigaction.c

/*
 * sigaction() for Xtensa uClibc
 *
 * Copyright (C) 2007, 2008 Tensilica Inc.
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include <errno.h>
#include <signal.h>
#include <sys/syscall.h>
#include <string.h>
#include <bits/kernel_sigaction.h>

#define SA_RESTORER	0x04000000

extern void __default_sa_restorer(void);

int __libc_sigaction(int sig, const struct sigaction *act,
					  struct sigaction *oact)
{
	struct sigaction kact;

	if (act && !(act->sa_flags & SA_RESTORER)) {
		memcpy(&kact, act, sizeof(kact));
		kact.sa_restorer = __default_sa_restorer;
		kact.sa_flags |= SA_RESTORER;
		act = &kact;
	}
	/* NB: kernel (as of 2.6.25) will return EINVAL
	 * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
	return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
}

#ifndef LIBC_SIGACTION
# ifndef __UCLIBC_HAS_THREADS__
strong_alias(__libc_sigaction,sigaction)
libc_hidden_def(sigaction)
# else
weak_alias(__libc_sigaction,sigaction)
libc_hidden_weak(sigaction)
# endif
#endif