1/* Remap a virtual memory address. Linux specific syscall.
2 Copyright (C) 2021-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/mman.h>
20#include <sysdep.h>
21#include <stdarg.h>
22#include <stddef.h>
23#include <errno.h>
24
25#define MREMAP_KNOWN_BITS \
26 (MREMAP_MAYMOVE \
27 | MREMAP_FIXED \
28 | MREMAP_DONTUNMAP)
29
30void *
31__mremap (void *addr, size_t old_len, size_t new_len, int flags, ...)
32{
33 va_list va;
34 void *new_addr = NULL;
35
36 if (flags & ~(MREMAP_KNOWN_BITS))
37 {
38 __set_errno (EINVAL);
39 return MAP_FAILED;
40 }
41
42 if (flags & (MREMAP_FIXED | MREMAP_DONTUNMAP))
43 {
44 va_start (va, flags);
45 new_addr = va_arg (va, void *);
46 va_end (va);
47 }
48
49 return (void *) INLINE_SYSCALL_CALL (mremap, addr, old_len, new_len, flags,
50 new_addr);
51}
52libc_hidden_def (__mremap)
53weak_alias (__mremap, mremap)
54

source code of glibc/sysdeps/unix/sysv/linux/mremap.c