1/* Wrapper for the mlock2 system call with fallback to mlock.
2 Copyright (C) 2017-2019 Free Software Foundation, Inc.
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
22int
23mlock2 (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}
41