summaryrefslogtreecommitdiffstats
path: root/share/examples/lkm/misc/module/misccall.c
diff options
context:
space:
mode:
Diffstat (limited to 'share/examples/lkm/misc/module/misccall.c')
-rw-r--r--share/examples/lkm/misc/module/misccall.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/share/examples/lkm/misc/module/misccall.c b/share/examples/lkm/misc/module/misccall.c
new file mode 100644
index 0000000..86741c4
--- /dev/null
+++ b/share/examples/lkm/misc/module/misccall.c
@@ -0,0 +1,77 @@
+/* 05 Jun 93*/
+/*
+ * misccall.c
+ *
+ * 05 Jun 93 Terry Lambert Split out of newsyscall.c
+ *
+ * Copyright (c) 1993 Terrence R. Lambert.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Terrence R. Lambert.
+ * 4. The name Terrence R. Lambert may not be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/systm.h>
+
+
+/*
+ * This is the actual code for system call... it can be static because
+ * we've externed it up above... the only plae it needs to be referenced
+ * is the sysent we are interested in.
+ *
+ * To write your own system call using this as a template, you could strip
+ * out this code and use the rest as a prototype module, changing only the
+ * function names and the number of arguments to the call in the module
+ * specific "sysent".
+ *
+ * You would have to use the "-R" option of "ld" to ensure a linkable file
+ * if you were to do this, since you would need to combine multiple ".o"
+ * files into a single ".o" file for use by "modload".
+ */
+int
+misccall( p, uap, retval)
+struct proc *p;
+void *uap;
+int retval[];
+{
+ /*
+ * Our new system call simply prints a message; it takes no
+ * arguments.
+ */
+
+ printf( "\nI am a loaded system call using the miscellaneous\n");
+ printf( "module loader interface and a kernel printf!\n");
+ printf( "I will print this message each time I am called!\n");
+
+ return( 0); /* success (or error code from errno.h)*/
+}
+
+/*
+ * EOF -- This file has not been truncated.
+ */
OpenPOWER on IntegriCloud