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"
  23 #ifndef BB_FEATURE_TRIVIAL_HELP
  24                          "\nDeallocate unused virtual terminal /dev/ttyN\n"
  25 #endif
  26                          );
  27         }
  28
  29         progname = argv[0];
  30
  31         fd = get_console_fd("/dev/console");
  32
  33         if (argc == 1) {
  34                 /* deallocate all unused consoles */
  35                 if (ioctl(fd, VT_DISALLOCATE, 0)) {
  36                         perror("VT_DISALLOCATE");
  37                         exit(1);
  38                 }
  39         } else
  40                 for (i = 1; i < argc; i++) {
  41                         num = atoi(argv[i]);
  42                         if (num == 0)
  43                                 fprintf(stderr, "%s: 0: illegal VT number\n", progname);
  44                         else if (num == 1)
  45                                 fprintf(stderr, "%s: VT 1 cannot be deallocated\n",
  46                                                 progname);
  47                         else if (ioctl(fd, VT_DISALLOCATE, num)) {
  48                                 perror("VT_DISALLOCATE");
  49                                 fprintf(stderr, "%s: could not deallocate console %d\n",
  50                                                 progname, num);
  51                                 exit(1);
  52                         }
  53                 }
  54         exit(0);
  55 }