1 /* vi: set sw=4 ts=4: */
3 * env implementation for busybox
5 * Copyright (c) 1988, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 * Original copyright notice is retained at the end of this file.
12 * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
14 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
16 * Fixed bug involving exit return codes if execvp fails. Also added
17 * output error checking.
20 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
21 * - correct "-" option usage
22 * - multiple "-u unsetenv" support
23 * - GNU long option support
24 * - use xfunc_error_retval
27 //config: bool "env (3.8 kb)"
30 //config: env is used to set an environment variable and run
31 //config: a command; without options it displays the current
32 //config: environment.
34 //applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
36 //kbuild:lib-$(CONFIG_ENV) += env.o
38 /* BB_AUDIT SUSv3 compliant */
39 /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
41 //usage:#define env_trivial_usage
42 //usage: "[-iu] [-] [name=value]... [PROG ARGS]"
43 //usage:#define env_full_usage "\n\n"
44 //usage: "Print the current environment or run PROG after setting up\n"
45 //usage: "the specified environment\n"
46 //usage: "\n -, -i Start with an empty environment"
47 //usage: "\n -u Remove variable from the environment"
51 int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
52 int env_main(int argc UNUSED_PARAM, char **argv)
55 llist_t *unset_env = NULL;
57 opts = getopt32long(argv, "+iu:+",
58 "ignore-environment\0" No_argument "i"
59 "unset\0" Required_argument "u"
63 if (argv[0] && LONE_DASH(argv[0])) {
71 char *var = llist_pop(&unset_env);
72 /* This does not handle -uVAR=VAL
73 * (coreutils _sets_ the variable in that case): */
75 /* This does, but uses somewhan undocumented feature that
76 * putenv("name_without_equal_sign") unsets the variable: */
80 while (*argv && (strchr(*argv, '=') != NULL)) {
81 if (putenv(*argv) < 0) {
82 bb_perror_msg_and_die("putenv");
88 BB_EXECVP_or_die(argv);
91 if (environ) { /* clearenv() may set environ == NULL! */
93 for (ep = environ; *ep; ep++) {
98 fflush_stdout_and_exit(EXIT_SUCCESS);
102 * Copyright (c) 1988, 1993, 1994
103 * The Regents of the University of California. All rights reserved.
105 * Redistribution and use in source and binary forms, with or without
106 * modification, are permitted provided that the following conditions
108 * 1. Redistributions of source code must retain the above copyright
109 * notice, this list of conditions and the following disclaimer.
110 * 2. Redistributions in binary form must reproduce the above copyright
111 * notice, this list of conditions and the following disclaimer in the
112 * documentation and/or other materials provided with the distribution.
114 * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
115 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
117 * 4. Neither the name of the University nor the names of its contributors
118 * may be used to endorse or promote products derived from this software
119 * without specific prior written permission.
121 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
122 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
123 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
124 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
125 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
126 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
127 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
128 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
129 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
130 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF