view toys/lsb/mknod.c @ 1728:d7e43cc0f525 draft

Add -m to mknod
author Rob Landley <>
date Tue, 10 Mar 2015 14:37:03 -0500
parents 786841fdb1e0
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/* mknod.c - make block or character special file
 * Copyright 2012 Elie De Brauwer <>


config MKNOD
  bool "mknod"
  default y
    usage: mknod [-m MODE] NAME TYPE [MAJOR MINOR]

    Create a special file NAME with a given type. TYPE is b for block device,
    c or u for character device, p for named pipe (which ignores MAJOR/MINOR).

    -m	Mode (file permissions) of new device, in octal or u+x format

#define FOR_mknod
#include "toys.h"

  char *m;

void mknod_main(void)
  mode_t modes[] = {S_IFIFO, S_IFCHR, S_IFCHR, S_IFBLK};
  int major=0, minor=0, type;
  int mode = TT.m ? string_to_mode(TT.m, 0777) : 0660;

  type = stridx("pcub", *toys.optargs[1]);
  if (type == -1) perror_exit("bad type '%c'", *toys.optargs[1]);
  if (type) {
    if (toys.optc != 4) perror_exit("need major/minor");

    major = atoi(toys.optargs[2]);
    minor = atoi(toys.optargs[3]);

  if (mknod(toys.optargs[0], mode | modes[type], makedev(major, minor)))
    perror_exit("mknod %s failed", toys.optargs[0]);