LXR toybox/toys/lsb/mknod.c

   1/* mknod.c - make block or character special file
   2 *
   3 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
   4 *
   5 * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/mknod.html
   6
   7USE_MKNOD(NEWTOY(mknod, "<2>4m(mode):"USE_MKNOD_Z("Z:"), TOYFLAG_BIN|TOYFLAG_UMASK))
   8
   9config MKNOD
  10  bool "mknod"
  11  default y
  12  help
  13    usage: mknod [-m MODE] NAME TYPE [MAJOR MINOR]
  14
  15    Create a special file NAME with a given type. TYPE is b for block device,
  16    c or u for character device, p for named pipe (which ignores MAJOR/MINOR).
  17
  18    -m  Mode (file permissions) of new device, in octal or u+x format
  19
  20config MKNOD_Z
  21  bool
  22  default y
  23  depends on MKNOD && !TOYBOX_LSM_NONE
  24  help
  25    usage: mknod [-Z CONTEXT] ...
  26
  27    -Z  Set security context to created file
  28*/
  29
  30#define FOR_mknod
  31#include "toys.h"
  32
  33GLOBALS(
  34  char *Z, *m;
  35)
  36
  37void mknod_main(void)
  38{
  39  mode_t modes[] = {S_IFIFO, S_IFCHR, S_IFCHR, S_IFBLK};
  40  int major=0, minor=0, type;
  41  int mode = TT.m ? string_to_mode(TT.m, 0777) : 0660;
  42
  43  type = stridx("pcub", *toys.optargs[1]);
  44  if (type == -1) perror_exit("bad type '%c'", *toys.optargs[1]);
  45  if (type) {
  46    if (toys.optc != 4) perror_exit("need major/minor");
  47
  48    major = atoi(toys.optargs[2]);
  49    minor = atoi(toys.optargs[3]);
  50  }
  51
  52  if (toys.optflags & FLAG_Z)
  53    if (-1 == lsm_set_create(TT.Z))
  54      perror_exit("-Z '%s' failed", TT.Z);
  55  if (mknod(*toys.optargs, mode|modes[type], dev_makedev(major, minor)))
  56    perror_exit_raw(*toys.optargs);
  57}
  58