/* vi: set sw=4 ts=4: */
/*
- * disalloc.c - aeb - 940501 - Disallocate virtual terminal(s)
- * Renamed deallocvt.
+ * Disallocate virtual terminal(s)
+ *
+ * Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include "internal.h"
-#include <stdlib.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
+
+/* no options, no getopt */
+
+#include "busybox.h"
/* From <linux/vt.h> */
-#define VT_DISALLOCATE 0x5608 /* free memory associated to vt */
+enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
int deallocvt_main(int argc, char *argv[])
{
- int fd, num, i;
-
- if ((argc != 2) || (**(argv + 1) == '-'))
- usage(deallocvt_usage);
+ /* num = 0 deallocate all unused consoles */
+ int num = 0;
- fd = get_console_fd("/dev/console");
+ switch (argc) {
+ case 2:
+ num = xatoul_range(argv[1], 1, 63);
+ /* Fallthrough */
+ case 1:
+ break;
+ default:
+ bb_show_usage();
+ }
- if (argc == 1) {
- /* deallocate all unused consoles */
- if (ioctl(fd, VT_DISALLOCATE, 0)) {
- perror("VT_DISALLOCATE");
- exit( FALSE);
- }
- } else
- for (i = 1; i < argc; i++) {
- num = atoi(argv[i]);
- if (num == 0)
- errorMsg("0: illegal VT number\n");
- else if (num == 1)
- errorMsg("VT 1 cannot be deallocated\n");
- else if (ioctl(fd, VT_DISALLOCATE, num)) {
- perror("VT_DISALLOCATE");
- errorMsg("could not deallocate console %d\n", num);
- exit( FALSE);
- }
- }
- return( TRUE);
+ if (-1 == ioctl(get_console_fd(), VT_DISALLOCATE, num)) {
+ bb_perror_msg_and_die("VT_DISALLOCATE");
+ }
+ return EXIT_SUCCESS;
}