1 #include <fcntl.h>
2 #include <sys/mman.h>
3 #include <sys/stat.h>
4 #include <unistd.h>
5
6 void* __mmap(void*, size_t, int, int, int, off_t);
7
__map_file(const char * pathname,size_t * size)8 const char unsigned* __map_file(const char* pathname, size_t* size) {
9 struct stat st;
10 const unsigned char* map = MAP_FAILED;
11 int fd = open(pathname, O_RDONLY | O_CLOEXEC | O_NONBLOCK);
12 if (fd < 0)
13 return 0;
14 if (!fstat(fd, &st)) {
15 map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
16 *size = st.st_size;
17 }
18 close(fd);
19 return map == MAP_FAILED ? 0 : map;
20 }
21