port-bsd.c

   1 #include <stdint.h>
   2 #include <sys/types.h>
   3 #include <unistd.h>
   4 #include <errno.h>
   5 #include "dat.h"
   6
   7 static char buf0[512]; /* buffer of zeros */
   8
   9 /* Allocate disk space.
  10  * Expects fd's offset to be 0; may also reset fd's offset to 0.
  11  * Returns 0 on success, and a positive errno otherwise. */
  12 int
  13 falloc(int fd, int len)
  14 {
  15     int i, w;
  16
  17     for (i = 0; i < len; i += w) {
  18         w = write(fd, buf0, sizeof buf0);
  19         if (w == -1) return errno;
  20     }
  21
  22     lseek(fd, 0, 0); /* do not care if this fails */
  23
  24     return 0;
  25 }