Add utility functions for checking if a given kernel module is loaded,

and loading it.

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/libutil/kld.c b/lib/libutil/kld.c
new file mode 100644
index 0000000..b8aa9ef
--- /dev/null
+++ b/lib/libutil/kld.c
@@ -0,0 +1,74 @@
+/*-
+ * Copyright (c) 2006 Dag-Erling Coïdan Smørgrav
+ * 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
+ *    in this position and unchanged.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <sys/module.h>
+
+#include <errno.h>
+
+int
+kld_isloaded(const char *name)
+{
+	struct kld_file_stat fstat;
+	struct module_stat mstat;
+	const char *ko;
+	int fid, mid;
+
+	for (fid = kldnext(0); fid > 0; fid = kldnext(fid)) {
+		fstat.version = sizeof(fstat);
+		if (kldstat(fid, &fstat) != 0)
+			continue;
+		/* check if the file name matches the supplied name */
+		if (strcmp(fstat.name, name) == 0)
+			return (1);
+		/* strip .ko and try again */
+		if ((ko = strstr(fstat.name, ".ko")) != NULL &&
+		    strlen(name) == ko - fstat.name &&
+		    strncmp(fstat.name, name, ko - fstat.name) == 0)
+			return (1);
+		/* look for a matching module within the file */
+		for (mid = kldfirstmod(fid); mid > 0; mid = modfnext(mid)) {
+			mstat.version = sizeof(mstat);
+			if (modstat(mid, &mstat) != 0)
+				continue;
+			if (strcmp(mstat.name, name) == 0)
+				return (1);
+		}
+	}
+	return (0);
+}
+
+int
+kld_load(const char *name)
+{
+	if (kldload(name) == -1 && errno != EEXIST)
+		return (-1);
+	return (0);
+}