linux.conf.au
The Compulsory Module Rant

 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
 #include <fcntl.h>
 #include <asm/unistd.h>

 #define FAIL(msg, ...) do { fprintf(stderr,msg,##__VA_ARGS__); exit(1); } while(0)
 int main(int argc, char *argv[])
 {
 	int fd, len = 0, max = 1000, ret;
 	void *buf = malloc(max);

 	if (argc != 2 && argc != 3)
 		FAIL("Usage: insmod filename [options]\n");

 	if ((fd = open(argv[1], O_RDONLY)) < 0)
 		FAIL("Can't open %s: %s\n", argv[1], strerror(errno));
 	while ((ret = read(fd, buf + len, max-len)) > 0) {
 		len += ret;
 		if (len == max)
 			buf = realloc(buf, max *= 2);
 	}
 	if (ret < 0)
 		FAIL("Reading %s: %s\n", argv[1], strerror(errno));
 	if (syscall(__NR_init_module, buf, len, argv[2] ?: "") < 0)
 		FAIL("Error inserting `%s': %s\n", argv[1], strerror(errno));
 	exit(0);
 }