/* 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 <fcntl.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <linux/vt.h>
-#include <stdio.h>
-char *progname;
+/* no options, no getopt */
-int deallocvt_main(int argc, char *argv[])
-{
- int fd, num, i;
+#include "libbb.h"
- if ((argc != 2) || (**(argv + 1) == '-')) {
- usage
- ("deallocvt N\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nDeallocate unused virtual terminal /dev/ttyN\n"
-#endif
- );
- }
+/* From <linux/vt.h> */
+enum { VT_DISALLOCATE = 0x5608 }; /* free memory associated to vt */
- progname = argv[0];
+int deallocvt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int deallocvt_main(int argc ATTRIBUTE_UNUSED, char **argv)
+{
+ /* num = 0 deallocate all unused consoles */
+ int num = 0;
- fd = get_console_fd("/dev/console");
+ if (argv[1]) {
+ if (argv[2])
+ bb_show_usage();
+ num = xatou_range(argv[1], 1, 63);
+ }
- if (argc == 1) {
- /* deallocate all unused consoles */
- if (ioctl(fd, VT_DISALLOCATE, 0)) {
- perror("VT_DISALLOCATE");
- exit(1);
- }
- } else
- for (i = 1; i < argc; i++) {
- num = atoi(argv[i]);
- if (num == 0)
- fprintf(stderr, "%s: 0: illegal VT number\n", progname);
- else if (num == 1)
- fprintf(stderr, "%s: VT 1 cannot be deallocated\n",
- progname);
- else if (ioctl(fd, VT_DISALLOCATE, num)) {
- perror("VT_DISALLOCATE");
- fprintf(stderr, "%s: could not deallocate console %d\n",
- progname, num);
- exit(1);
- }
- }
- exit(0);
+ /* double cast suppresses "cast to ptr from int of different size" */
+ xioctl(get_console_fd(), VT_DISALLOCATE, (void *)(ptrdiff_t)num);
+ return EXIT_SUCCESS;
}