Replace current verbose GPL stuff in libbb/*.c with one-line GPL boilerplate.

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

diff --git a/console-tools/chvt.c b/console-tools/chvt.c
index 81d1995272f02131615eebfa57dd0f37e3801b0e..aff66e007019632ec6be03cde4992fcceb5e1495 100644 (file)
--- a/console-tools/chvt.c
+++ b/console-tools/chvt.c
@@ -1,36 +1,38 @@
+/* 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>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
-#include "internal.h"
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <linux/vt.h>
+
 #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> */
+enum {
+       VT_ACTIVATE = 0x5606,   /* make vt active */
+       VT_WAITACTIVE = 0x5607  /* wait for vt active */
+};
 
-int
-chvt_main(int argc, char** argv) 
+int chvt_main(int argc, char **argv)
 {
-    int fd, num;
+       int fd, num;
 
-    if ( ( argc != 2) || (**(argv+1) == '-' ) ) {
-       usage ("chvt </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);
-}
+       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;
+}