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4bab0224 | 1 | /* Wrapper for the mlock2 system call with fallback to mlock. |
688903eb | 2 | Copyright (C) 2017-2018 Free Software Foundation, Inc. |
4bab0224 FW |
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 <sys/mman.h> | |
19 | #include <errno.h> | |
20 | #include <sysdep.h> | |
21 | ||
22 | int | |
23 | mlock2 (const void *addr, size_t length, unsigned int flags) | |
24 | { | |
25 | #ifdef __ASSUME_MLOCK2 | |
26 | return INLINE_SYSCALL_CALL (mlock2, addr, length, flags); | |
27 | #else | |
28 | if (flags == 0) | |
29 | return INLINE_SYSCALL_CALL (mlock, addr, length); | |
30 | # ifdef __NR_mlock2 | |
31 | int ret = INLINE_SYSCALL_CALL (mlock2, addr, length, flags); | |
32 | if (ret == 0 || errno != ENOSYS) | |
33 | return ret; | |
34 | # endif /* __NR_mlock2 */ | |
35 | /* Treat the missing system call as an invalid (non-zero) flag | |
36 | argument. */ | |
37 | __set_errno (EINVAL); | |
38 | return -1; | |
39 | #endif /* __ASSUME_MLOCK2 */ | |
40 | } |