/usr/include/x86_64-linux-musl/sys/mman.h is in musl-dev 0.9.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | #ifndef _SYS_MMAN_H
#define _SYS_MMAN_H
#ifdef __cplusplus
extern "C" {
#endif
#include <features.h>
#define __NEED_mode_t
#define __NEED_size_t
#define __NEED_off_t
#if defined(_GNU_SOURCE)
#define __NEED_ssize_t
#endif
#include <bits/alltypes.h>
#include <bits/mman.h>
void *mmap (void *, size_t, int, int, int, off_t);
int munmap (void *, size_t);
int mprotect (void *, size_t, int);
int msync (void *, size_t, int);
int posix_madvise (void *, size_t, int);
int mlock (const void *, size_t);
int munlock (const void *, size_t);
int mlockall (int);
int munlockall (void);
#ifdef _GNU_SOURCE
void *mremap (void *, size_t, size_t, int, ...);
int remap_file_pages (void *, size_t, int, ssize_t, int);
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
int madvise (void *, size_t, int);
int mincore (void *, size_t, unsigned char *);
#endif
int shm_open (const char *, int, mode_t);
int shm_unlink (const char *);
#if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
#define mmap64 mmap
#define off64_t off_t
#endif
#ifdef __cplusplus
}
#endif
#endif
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