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 <sys/eventfd.h> |
20 | #include <sysdep.h> |
21 | #include <kernel-features.h> |
22 | |
23 | |
24 | int |
25 | eventfd (unsigned int count, int flags) |
26 | { |
27 | #ifdef __NR_eventfd2 |
28 | int res = INLINE_SYSCALL (eventfd2, 2, count, flags); |
29 | # ifndef __ASSUME_EVENTFD2 |
30 | if (res != -1 || errno != ENOSYS) |
31 | # endif |
32 | return res; |
33 | #endif |
34 | |
35 | #ifndef __ASSUME_EVENTFD2 |
36 | /* The old system call has no flag parameter which is bad. So we have |
37 | to wait until we have to support to pass additional values to the |
38 | kernel (sys_indirect) before implementing setting flags like |
39 | O_NONBLOCK etc. */ |
40 | if (flags != 0) |
41 | return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL); |
42 | |
43 | # ifdef __NR_eventfd |
44 | return INLINE_SYSCALL (eventfd, 1, count); |
45 | # else |
46 | return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOSYS); |
47 | # endif |
48 | #elif !defined __NR_eventfd2 |
49 | # error "__ASSUME_EVENTFD2 defined but not __NR_eventfd2" |
50 | #endif |
51 | } |
52 | |