- Mention code-cleanup possibilities in TODO.

[oweals/busybox.git] / console-tools / chvt.c

diff --git a/console-tools/chvt.c b/console-tools/chvt.c
index bea00ea83accfd67104533275093b11fa04d115c..b1a429eb38ce21f1a233fb4d451fca5b9a67629a 100644 (file)
--- a/console-tools/chvt.c
+++ b/console-tools/chvt.c
@@ -1,36 +1,59 @@
+/* vi: set sw=4 ts=4: */
 /*
- * chvt.c - aeb - 940227 - Change virtual terminal
+ * Mini chvt implementation for busybox
  *
- * busyboxed by Erik Andersen
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-#include "internal.h"
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <linux/vt.h>
+
+/* no options, no getopt */
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <fcntl.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include "busybox.h"
 
-extern int getfd(void);
+/* From <linux/vt.h> */
+static const int VT_ACTIVATE = 0x5606;  /* make vt active */
+static const int VT_WAITACTIVE = 0x5607;  /* wait for vt active */
 
-int
-chvt_main(int argc, char** argv) 
+int chvt_main(int argc, char **argv)
 {
-    int fd, num;
-
-    if ( ( argc != 2) || (**(argv+1) == '-' ) ) {
-       usage ("chvt N\n\nChange foreground virtual terminal to /dev/ttyN\n");
-    }
-    fd = get_console_fd("/dev/console");
-    num = atoi(argv[1]);
-    if (ioctl(fd,VT_ACTIVATE,num)) {
-       perror("VT_ACTIVATE");
-       exit(FALSE);
-    }
-    if (ioctl(fd,VT_WAITACTIVE,num)) {
-       perror("VT_WAITACTIVE");
-       exit(FALSE);
-    }
-    exit( TRUE);
+       int fd, num;
+
+       if (argc != 2) {
+               bb_show_usage();
+       }
+
+       fd = get_console_fd();
+       num =  bb_xgetlarg(argv[1], 10, 0, INT_MAX);
+       if((-1 == ioctl(fd, VT_ACTIVATE, num)) ||
+          (-1 == ioctl(fd, VT_WAITACTIVE, num))) {
+               bb_perror_msg_and_die("ioctl");
+       }
+       return EXIT_SUCCESS;
 }
 
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/