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
| | #define _BSD_SOURCE
#include <sys/mman.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdint.h>
#include "syscall.h"
#include "kstat.h"
#include "statx.h"
const char unsigned *__map_file(const char *pathname, size_t *size)
{
const unsigned char *map = MAP_FAILED;
int fd = sys_open(pathname, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
if (fd < 0) return 0;
#ifdef SYS_fstat
struct kstat st;
if (!syscall(SYS_fstat, fd, &st)) {
map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
*size = st.st_size;
}
#else
struct statx st;
if (!syscall(SYS_statx, fd, "", AT_EMPTY_PATH, STATX_SIZE, &st)) {
map = __mmap(0, st.stx_size, PROT_READ, MAP_SHARED, fd, 0);
*size = st.stx_size;
}
#endif
__syscall(SYS_close, fd);
return map == MAP_FAILED ? 0 : map;
}
|