libc-top-half/musl/src/time/__map_file.c

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