console-tools/deallocvt.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * disalloc.c - aeb - 940501 - Disallocate virtual terminal(s)
   4  * Renamed deallocvt.
   5  */
   6 #include "internal.h"
   7 #include <stdlib.h>
   8 #include <fcntl.h>
   9 #include <sys/types.h>
  10 #include <sys/ioctl.h>
  11 #include <linux/vt.h>
  12 #include <stdio.h>
  13
  14 char *progname;
  15
  16 int deallocvt_main(int argc, char *argv[])
  17 {
  18         int fd, num, i;
  19
  20         if ((argc != 2) || (**(argv + 1) == '-')) {
  21                 usage
  22                         ("deallocvt N\n\nDeallocate unused virtual terminal /dev/ttyN\n");
  23         }
  24
  25         progname = argv[0];
  26
  27         fd = get_console_fd("/dev/console");
  28
  29         if (argc == 1) {
  30                 /* deallocate all unused consoles */
  31                 if (ioctl(fd, VT_DISALLOCATE, 0)) {
  32                         perror("VT_DISALLOCATE");
  33                         exit(1);
  34                 }
  35         } else
  36                 for (i = 1; i < argc; i++) {
  37                         num = atoi(argv[i]);
  38                         if (num == 0)
  39                                 fprintf(stderr, "%s: 0: illegal VT number\n", progname);
  40                         else if (num == 1)
  41                                 fprintf(stderr, "%s: VT 1 cannot be deallocated\n",
  42                                                 progname);
  43                         else if (ioctl(fd, VT_DISALLOCATE, num)) {
  44                                 perror("VT_DISALLOCATE");
  45                                 fprintf(stderr, "%s: could not deallocate console %d\n",
  46                                                 progname, num);
  47                                 exit(1);
  48                         }
  49                 }
  50         exit(0);
  51 }