Linux Device Drivers 3 examples

1 files changed, 42 insertions, 0 deletions

diff --git a/misc-progs/setconsole.c b/misc-progs/setconsole.c
new file mode 100644
index 0000000..04bc11d
--- /dev/null
+++ b/misc-progs/setconsole.c
@@ -0,0 +1,42 @@
+/*
+ * setconsole.c -- choose a console to receive kernel messages
+ *
+ * Copyright (C) 1998,2000,2001 Alessandro Rubini
+ * 
+ *   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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+
+int main(int argc, char **argv)
+{
+    char bytes[2] = {11,0}; /* 11 is the TIOCLINUX cmd number */
+
+    if (argc==2) bytes[1] = atoi(argv[1]); /* the chosen console */
+    else {
+        fprintf(stderr, "%s: need a single arg\n",argv[0]); exit(1);
+    }
+    if (ioctl(STDIN_FILENO, TIOCLINUX, bytes)<0) {    /* use stdin */
+        fprintf(stderr,"%s: ioctl(stdin, TIOCLINUX): %s\n",
+                argv[0], strerror(errno));
+        exit(1);
+    }
+    exit(0);
+}