commands/simple/devsize.c

   1 /* Ben Gras
   2  *
   3  * Based on sizeup() in mkfs.c.
   4  */
   5
   6 #include <sys/types.h>
   7 #include <sys/dir.h>
   8 #include <sys/stat.h>
   9 #include <machine/partition.h>
  10 #include <minix/partition.h>
  11 #include <minix/u64.h>
  12 #include <sys/ioc_disk.h>
  13 #include <stdio.h>
  14 #include <errno.h>
  15 #include <fcntl.h>
  16 #include <limits.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <time.h>
  20 #include <unistd.h>
  21
  22 unsigned long sizeup(char *);
  23
  24 int main(int argc, char *argv[])
  25 {
  26   if(argc != 2) {
  27         fprintf(stderr, "Usage: %s <device>\n", argv[0]);
  28         return 1;
  29   }
  30
  31   printf("%lu\n", sizeup(argv[1]));
  32   return 0;
  33 }
  34
  35
  36 unsigned long sizeup(device)
  37 char *device;
  38 {
  39   int fd;
  40   struct partition entry;
  41   unsigned long d;
  42
  43   if ((fd = open(device, O_RDONLY)) == -1) {
  44         perror("sizeup open");
  45         exit(1);
  46   }
  47   if (ioctl(fd, DIOCGETP, &entry) == -1) {
  48         perror("sizeup ioctl");
  49         exit(1);
  50   }
  51   close(fd);
  52   d = div64u(entry.size, 512);
  53   return d;
  54 }