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/* Wrapper for the mlock2 system call with fallback to mlock.
Copyright (C) 2017-2024 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/mman.h>
#include <errno.h>
#include <sysdep.h>
int
mlock2 (const void *addr, size_t length, unsigned int flags)
{
#ifdef __ASSUME_MLOCK2
return INLINE_SYSCALL_CALL (mlock2, addr, length, flags);
#else
if (flags == 0)
return INLINE_SYSCALL_CALL (mlock, addr, length);
int ret = INLINE_SYSCALL_CALL (mlock2, addr, length, flags);
if (ret == 0 || errno != ENOSYS)
return ret;
/* Treat the missing system call as an invalid (non-zero) flag
argument. */
__set_errno (EINVAL);
return -1;
#endif /* __ASSUME_MLOCK2 */
}
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