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b168057a | 1 | /* Copyright (C) 2007-2015 Free Software Foundation, Inc. |
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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 | |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
18 | #include <errno.h> | |
19 | #include <sys/eventfd.h> | |
20 | #include <sysdep.h> | |
aa7492d2 | 21 | #include <kernel-features.h> |
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22 | |
23 | ||
24 | int | |
69eb9a18 | 25 | eventfd (unsigned int count, int flags) |
6789aaaa | 26 | { |
45a8beb5 | 27 | #ifdef __NR_eventfd2 |
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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 | |
bdcebfc4 | 36 | /* The old system call has no flag parameter which is bad. So we have |
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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 | { | |
42 | __set_errno (EINVAL); | |
43 | return -1; | |
44 | } | |
45 | ||
bdcebfc4 | 46 | # ifdef __NR_eventfd |
6789aaaa | 47 | return INLINE_SYSCALL (eventfd, 1, count); |
bdcebfc4 | 48 | # else |
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49 | __set_errno (ENOSYS); |
50 | return -1; | |
bdcebfc4 | 51 | # endif |
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52 | #elif !defined __NR_eventfd2 |
53 | # error "__ASSUME_EVENTFD2 defined but not __NR_eventfd2" | |
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54 | #endif |
55 | } |