Linux Device Drivers 3 examples

1 files changed, 47 insertions, 0 deletions

diff --git a/misc-progs/setlevel.c b/misc-progs/setlevel.c
new file mode 100644
index 0000000..fec666d
--- /dev/null
+++ b/misc-progs/setlevel.c
@@ -0,0 +1,47 @@
+/*
+ * setlevel.c -- choose a console_loglevel for the kernel
+ *
+ * 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> */ /* conflicting on the alpha */
+#define __LIBRARY__ /* _syscall3 and friends are only available through this */
+#include <linux/unistd.h>
+
+/* define the system call, to override the library function */
+_syscall3(int, syslog, int, type, char *, bufp, int, len);
+
+int main(int argc, char **argv)
+{
+    int level;
+
+    if (argc==2) {
+	level = atoi(argv[1]); /* the chosen console */
+    } else {
+        fprintf(stderr, "%s: need a single arg\n",argv[0]); exit(1);
+    }
+    if (syslog(8,NULL,level) < 0) {  
+        fprintf(stderr,"%s: syslog(setlevel): %s\n",
+                argv[0],strerror(errno));
+        exit(1);
+    }
+    exit(0);
+}