toys/other/insmod.c

/* vi: set sw=4 ts=4:
 *
 * insmod.c - Load a module into the Linux kernel.
 *
 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>

USE_INSMOD(NEWTOY(insmod, "<1", TOYFLAG_BIN|TOYFLAG_NEEDROOT))

config INSMOD
	bool "insmod"
	default y
	help
	  usage: insmod MODULE [MODULE_OPTIONS]

	  Load the module named MODULE passing options if given.
*/

#include "toys.h"

#include <sys/syscall.h>
#define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts)

void insmod_main(void)
{
	char * buf = NULL;
	int len, res, i;
	int fd = xopen(toys.optargs[0], O_RDONLY);

	len = fdlength(fd);
	buf = xmalloc(len);
	xreadall(fd, buf, len);

	i = 1;
	while(toys.optargs[i] &&
		strlen(toybuf) + strlen(toys.optargs[i]) + 2 < sizeof(toybuf)) {
		strcat(toybuf, toys.optargs[i++]);
		strcat(toybuf, " ");
	}

	res = init_module(buf, len, toybuf);
	if (CFG_TOYBOX_FREE && buf != toybuf) free(buf);

	if (res)
		perror_exit("failed to load %s", toys.optargs[0]);
}