Terry Lambert's loadable kernel module support - modload & modunload

utilities w/improvements from the NetBSD group.

1 files changed, 126 insertions, 0 deletions

diff --git a/sbin/modunload/modunload.c b/sbin/modunload/modunload.c
new file mode 100644
index 0000000..88689ff
--- /dev/null
+++ b/sbin/modunload/modunload.c
@@ -0,0 +1,126 @@
+/*
+ * 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.
+ *
+ *	$Id: modunload.c,v 1.6 1994/05/23 05:42:58 cgd Exp $
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <err.h>
+#include <string.h>
+#include <a.out.h>
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/conf.h>
+#include <sys/mount.h>
+#include <sys/lkm.h>
+#include <sys/file.h>
+#include <sys/errno.h>
+#include "pathnames.h"
+
+void
+usage()
+{
+
+	fprintf(stderr, "usage:\n");
+	fprintf(stderr, "modunload [-i <module id>] [-n <module name>]\n");
+	exit(1);
+}
+
+int devfd;
+
+void
+cleanup()
+{
+
+	close(devfd);
+}
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	int c;
+	int modnum = -1;
+	char *modname = NULL;
+	struct lmc_unload ulbuf;
+
+	while ((c = getopt(argc, argv, "i:n:")) != EOF) {
+		switch (c) {
+		case 'i':
+			modnum = atoi(optarg);
+			break;	/* number */
+		case 'n':
+			modname = optarg;
+			break;	/* name */
+		case '?':
+			usage();
+		default:
+			printf("default!\n");
+			break;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 0 || (modnum == -1 && modname == NULL))
+		usage();
+
+
+	/*
+	 * Open the virtual device device driver for exclusive use (needed
+	 * to ioctl() to retrive the loaded module(s) status).
+	 */
+	if ((devfd = open(_PATH_LKM, O_RDWR, 0)) == -1)
+		err(2, _PATH_LKM);
+
+	atexit(cleanup);
+
+	/*
+	 * Unload the requested module.
+	 */
+	ulbuf.name = modname;
+	ulbuf.id = modnum;
+
+	if (ioctl(devfd, LMUNLOAD, &ulbuf) == -1) {
+		switch (errno) {
+		case EINVAL:		/* out of range */
+			errx(3, "id out of range");
+		case ENOENT:		/* no such entry */
+			errx(3, "no such module");
+		default:		/* other error (EFAULT, etc) */
+			err(5, "LMUNLOAD");
+		}
+	}
+
+	return 0;
+}