Add insmod(8)

Makefile

@@ -16,6 +16,11 @@ SRC = \
 	dmesg.c             \
 	umount.c
 
+ifeq ($(OS),linux)
+SRC += \
+	insmod.c
+endif
+
 OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
 MAN = $(SRC:.c=.1)

insmod.c

@@ -0,0 +1,70 @@
+/* See LICENSE file for copyright and license details. */
+#include <sys/syscall.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s filename [args]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *buf = NULL, *opts = NULL;
+	unsigned long blen, plen = 0;
+	int i, fd;
+	ssize_t n;
+	struct stat sb;
+
+	ARGBEGIN {
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc < 1)
+		usage();
+
+	fd = open(argv[0], O_RDONLY);
+	if (fd < 0)
+		eprintf("open %s:", argv[0]);
+	if (fstat(fd, &sb) < 0)
+		eprintf("stat %s:", argv[0]);
+	buf = malloc(sb.st_size);
+	if (!buf)
+		eprintf("malloc:");
+	blen = sb.st_size;
+
+	if ((n = read(fd, buf, blen)) != blen)
+		eprintf("read:");
+
+	argc--;
+	argv++;
+
+	for (i = 0; i < argc; i++)
+		plen += strlen(argv[i]);
+	if (plen > 0) {
+		plen += argc;
+		opts = malloc(plen);
+		if (!opts)
+			eprintf("malloc:");
+		for (i = 0; i < argc; i++) {
+			strcat(opts, argv[i]);
+			if (i + 1 < argc)
+				strcat(opts, " ");
+		}
+	}
+
+	if (syscall(__NR_init_module, buf, blen, opts) < 0)
+		eprintf("init_module:");
+
+	free(opts);
+	free(buf);
+	return 0;
+}