LXR toybox/toys/other/insmod.c

   1/* insmod.c - Load a module into the Linux kernel.
   2 *
   3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
   4
   5USE_INSMOD(NEWTOY(insmod, "<1", TOYFLAG_SBIN|TOYFLAG_NEEDROOT))
   6
   7config INSMOD
   8  bool "insmod"
   9  default y
  10  help
  11    usage: insmod MODULE [OPTION...]
  12
  13    Load the module named MODULE passing options if given.
  14*/
  15
  16#include "toys.h"
  17
  18void insmod_main(void)
  19{
  20  int fd = xopenro(*toys.optargs);
  21  int i, rc;
  22
  23  i = 1;
  24  while (toys.optargs[i] &&
  25    strlen(toybuf) + strlen(toys.optargs[i]) + 2 < sizeof(toybuf))
  26  {
  27    strcat(toybuf, toys.optargs[i++]);
  28    strcat(toybuf, " ");
  29  }
  30
  31  // finit_module doesn't work on stdin, so we fall back to init_module...
  32  rc = syscall(SYS_finit_module, fd, toybuf, 0);
  33  if (rc && (fd == 0 || errno == ENOSYS)) {
  34    off_t len = 0;
  35    char *path = !strcmp(*toys.optargs, "-") ? "/dev/stdin" : *toys.optargs;
  36    char *buf = readfileat(AT_FDCWD, path, NULL, &len);
  37
  38    if (!buf) perror_exit("couldn't read %s", path);
  39    rc = syscall(SYS_init_module, buf, len, toybuf);
  40    if (CFG_TOYBOX_FREE) free(buf);
  41  }
  42
  43  if (rc) perror_exit("failed to load %s", toys.optargs[0]);
  44
  45  if (CFG_TOYBOX_FREE) close(fd);
  46}
  47