memmap.c

   1 #include <sys/mman.h>
   2 #include <sys/stat.h>
   3 #include <sys/types.h>
   4 #include <unistd.h>
   5
   6 #include "memmap.h"
   7
   8 int mem_map_read (struct memory *mem, int fd)
   9 {
  10         struct stat sb;
  11         int err;
  12
  13         err = fstat(fd, &sb);
  14         if (err < 0)
  15                 return err;
  16         /* We assume that file is not modified while we use mapping */
  17         mem->data = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
  18         if (mem->data == MAP_FAILED) {
  19                 return -1;
  20         }
  21         mem->length = sb.st_size;
  22         return 0;
  23 }
  24
  25 void mem_unmap (struct memory *mem)
  26 {
  27         munmap(mem->data, mem->length);
  28 }