1#include <fcntl.h>
2#include <sys/mman.h>
3#include <sys/stat.h>
4#include <unistd.h>
5
6void* __mmap(void*, size_t, int, int, int, off_t);
7
8const 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