commands/simple/eject.c

   1 /*      eject 1.3 - Eject removable media               Author: Kees J. Bot
   2  *                                                              11 Dec 1993
   3  */
   4 #define nil 0
   5 #include <sys/types.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <string.h>
  11 #include <sys/ioctl.h>
  12
  13 void fatal(char *label)
  14 {
  15         fprintf(stderr, "eject: %s: %s\n", label, strerror(errno));
  16         exit(1);
  17 }
  18
  19 void main(int argc, char **argv)
  20 {
  21         char *device;
  22         int fd;
  23
  24         if (argc != 2) {
  25                 fprintf(stderr, "Usage: eject <device>\n");
  26                 exit(1);
  27         }
  28
  29         device= argv[1];
  30
  31         /* Try to open it in whatever mode. */
  32         fd= open(device, O_RDONLY);
  33         if (fd < 0 && errno == EACCES) fd= open(device, O_WRONLY);
  34         if (fd < 0) fatal(device);
  35
  36         /* Tell it to eject. */
  37         if (ioctl(fd, DIOCEJECT, nil) < 0) fatal(device);
  38         exit(0);
  39 }