mman.h

 1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
 2/*
 3 * mm definition for NOLIBC
 4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
 5 */
 6
 7/* make sure to include all global symbols */
 8#include "../nolibc.h"
 9
10#ifndef _NOLIBC_SYS_MMAN_H
11#define _NOLIBC_SYS_MMAN_H
12
13#include "../arch.h"
14#include "../sys.h"
15
16#ifndef sys_mmap
17static __attribute__((unused))
18void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
19	       off_t offset)
20{
21	int n;
22
23#if defined(__NR_mmap2)
24	n = __NR_mmap2;
25	offset >>= 12;
26#else
27	n = __NR_mmap;
28#endif
29
30	return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset);
31}
32#endif
33
34static __attribute__((unused))
35void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
36{
37	void *ret = sys_mmap(addr, length, prot, flags, fd, offset);
38
39	if ((unsigned long)ret >= -4095UL) {
40		SET_ERRNO(-(long)ret);
41		ret = MAP_FAILED;
42	}
43	return ret;
44}
45
46static __attribute__((unused))
47void *sys_mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
48{
49	return (void *)my_syscall5(__NR_mremap, old_address, old_size,
50				   new_size, flags, new_address);
51}
52
53static __attribute__((unused))
54void *mremap(void *old_address, size_t old_size, size_t new_size, int flags, void *new_address)
55{
56	void *ret = sys_mremap(old_address, old_size, new_size, flags, new_address);
57
58	if ((unsigned long)ret >= -4095UL) {
59		SET_ERRNO(-(long)ret);
60		ret = MAP_FAILED;
61	}
62	return ret;
63}
64
65static __attribute__((unused))
66int sys_munmap(void *addr, size_t length)
67{
68	return my_syscall2(__NR_munmap, addr, length);
69}
70
71static __attribute__((unused))
72int munmap(void *addr, size_t length)
73{
74	return __sysret(sys_munmap(addr, length));
75}
76
77#endif /* _NOLIBC_SYS_MMAN_H */