minix/commands/devsize/devsize.c

   1 /* Ben Gras
   2  *
   3  * Based on sizeup() in mkfs.c.
   4  */
   5
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <machine/partition.h>
   9 #include <minix/partition.h>
  10 #include <sys/ioc_disk.h>
  11 #include <stdio.h>
  12 #include <errno.h>
  13 #include <fcntl.h>
  14 #include <limits.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <time.h>
  18 #include <unistd.h>
  19
  20 unsigned long sizeup(char *);
  21
  22 int main(int argc, char *argv[])
  23 {
  24   if(argc != 2) {
  25         fprintf(stderr, "Usage: %s <device>\n", argv[0]);
  26         return 1;
  27   }
  28
  29   printf("%lu\n", sizeup(argv[1]));
  30   return 0;
  31 }
  32
  33
  34 unsigned long sizeup(char *device)
  35 {
  36   int fd;
  37   struct part_geom entry;
  38   unsigned long d;
  39
  40   if ((fd = open(device, O_RDONLY)) == -1) {
  41         perror("sizeup open");
  42         exit(1);
  43   }
  44   if (ioctl(fd, DIOCGETP, &entry) == -1) {
  45         perror("sizeup ioctl");
  46         exit(1);
  47   }
  48   close(fd);
  49   d = entry.size / 512;
  50   return d;
  51 }