busybox

/* vi: set sw=4 ts=4: */

/*

 * Mini chmod implementation for busybox

 *

 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>

 *

 * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>

 *  to correctly parse '-rwxgoa'

 *

 * Licensed under GPLv2 or later, see file LICENSE in this source tree.

 */

//config:config CHMOD

//config:   bool "chmod (5.1 kb)"

//config:   default y

//config:   help

//config:   chmod is used to change the access permission of files.

​

//applet:IF_CHMOD(APPLET_NOEXEC(chmod, chmod, BB_DIR_BIN, BB_SUID_DROP, chmod))

​

//kbuild:lib-$(CONFIG_CHMOD) += chmod.o

​

/* BB_AUDIT SUSv3 compliant */

/* BB_AUDIT GNU defects - unsupported long options. */

/* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */

​

//usage:#define chmod_trivial_usage

//usage:       "[-R"IF_DESKTOP("cvf")"] MODE[,MODE]... FILE..."

//usage:#define chmod_full_usage "\n\n"

//usage:       "Each MODE is one or more of the letters ugoa, one of the\n"

//usage:       "symbols +-= and one or more of the letters rwxst\n"

//usage:     "\n    -R  Recurse"

//usage:    IF_DESKTOP(

//usage:     "\n    -c  List changed files"

//usage:     "\n    -v  List all files"

//usage:     "\n    -f  Hide errors"

//usage:    )

//usage:

//usage:#define chmod_example_usage

//usage:       "$ ls -l /tmp/foo\n"

//usage:       "-rw-rw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"

//usage:       "$ chmod u+x /tmp/foo\n"

//usage:       "$ ls -l /tmp/foo\n"

//usage:       "-rwxrw-r--    1 root     root            0 Apr 12 18:25 /tmp/foo*\n"

//usage:       "$ chmod 444 /tmp/foo\n"

//usage:       "$ ls -l /tmp/foo\n"

//usage:       "-r--r--r--    1 root     root            0 Apr 12 18:25 /tmp/foo\n"

​

#include "libbb.h"

​

/* This is a NOEXEC applet. Be very careful! */

​

​

#define OPT_RECURSE (option_mask32 & 1)

#define OPT_VERBOSE (IF_DESKTOP(option_mask32 & 2) IF_NOT_DESKTOP(0))

#define OPT_CHANGED (IF_DESKTOP(option_mask32 & 4) IF_NOT_DESKTOP(0))

#define OPT_QUIET   (IF_DESKTOP(option_mask32 & 8) IF_NOT_DESKTOP(0))

#define OPT_STR     "R" IF_DESKTOP("vcf")

​

/* coreutils:

 * chmod never changes the permissions of symbolic links; the chmod

 * system call cannot change their permissions. This is not a problem

 * since the permissions of symbolic links are never used.

 * However, for each symbolic link listed on the command line, chmod changes