1/* Copyright (C) 2007-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <signal.h>
20#include <sys/signalfd.h>
21#include <sysdep.h>
22#include <kernel-features.h>
23
24
25int
26signalfd (int fd, const sigset_t *mask, int flags)
27{
28#ifdef __NR_signalfd4
29 int res = INLINE_SYSCALL (signalfd4, 4, fd, mask, _NSIG / 8, flags);
30# ifndef __ASSUME_SIGNALFD4
31 if (res != -1 || errno != ENOSYS)
32# endif
33 return res;
34#endif
35
36#ifndef __ASSUME_SIGNALFD4
37 /* The old system call has no flag parameter which is bad. So we have
38 to wait until we have to support to pass additional values to the
39 kernel (sys_indirect) before implementing setting flags like
40 O_NONBLOCK etc. */
41 if (flags != 0)
42 return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
43
44# ifdef __NR_signalfd
45 return INLINE_SYSCALL (signalfd, 3, fd, mask, _NSIG / 8);
46# else
47 return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOSYS);
48# endif
49#elif !defined __NR_signalfd4
50# error "__ASSUME_SIGNALFD4 defined but not __NR_signalfd4"
51#endif
52}
53