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 <stdio.h>
   9 #include <fcntl.h>
  10 #include <sys/types.h>
  11 #include <sys/ioctl.h>
  12
  13 /* From <linux/vt.h> */
  14 #define VT_DISALLOCATE  0x5608  /* free memory associated to vt */
  15
  16
  17 char *progname;
  18
  19 int deallocvt_main(int argc, char *argv[])
  20 {
  21         int fd, num, i;
  22
  23         if ((argc != 2) || (**(argv + 1) == '-')) {
  24                 usage
  25                         ("deallocvt N\n"
  26 #ifndef BB_FEATURE_TRIVIAL_HELP
  27                          "\nDeallocate unused virtual terminal /dev/ttyN\n"
  28 #endif
  29                          );
  30         }
  31
  32         progname = argv[0];
  33
  34         fd = get_console_fd("/dev/console");
  35
  36         if (argc == 1) {
  37                 /* deallocate all unused consoles */
  38                 if (ioctl(fd, VT_DISALLOCATE, 0)) {
  39                         perror("VT_DISALLOCATE");
  40                         exit( FALSE);
  41                 }
  42         } else
  43                 for (i = 1; i < argc; i++) {
  44                         num = atoi(argv[i]);
  45                         if (num == 0)
  46                                 fprintf(stderr, "%s: 0: illegal VT number\n", progname);
  47                         else if (num == 1)
  48                                 fprintf(stderr, "%s: VT 1 cannot be deallocated\n",
  49                                                 progname);
  50                         else if (ioctl(fd, VT_DISALLOCATE, num)) {
  51                                 perror("VT_DISALLOCATE");
  52                                 fprintf(stderr, "%s: could not deallocate console %d\n",
  53                                                 progname, num);
  54                                 exit( FALSE);
  55                         }
  56                 }
  57         return( TRUE);
  58 }