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 | |
25 | int |
26 | signalfd (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 | |