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 <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 int deallocvt_main(int argc, char *argv[])
  17 {
  18         int fd, num, i;
  19
  20         if ((argc > 2) || ((argv == 2) && (**(argv + 1) == '-')))
  21                 usage(deallocvt_usage);
  22
  23         fd = get_console_fd("/dev/console");
  24
  25         if (argc == 1) {
  26                 /* deallocate all unused consoles */
  27                 if (ioctl(fd, VT_DISALLOCATE, 0)) {
  28                         perror("VT_DISALLOCATE");
  29                         exit( FALSE);
  30                 }
  31         } else
  32                 for (i = 1; i < argc; i++) {
  33                         num = atoi(argv[i]);
  34                         if (num == 0)
  35                                 errorMsg("0: illegal VT number\n");
  36                         else if (num == 1)
  37                                 errorMsg("VT 1 cannot be deallocated\n");
  38                         else if (ioctl(fd, VT_DISALLOCATE, num)) {
  39                                 perror("VT_DISALLOCATE");
  40                                 errorMsg("could not deallocate console %d\n", num);
  41                                 exit( FALSE);
  42                         }
  43                 }
  44         return( TRUE);
  45 }