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
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 //config:config FEATURE_ENV_LONG_OPTIONS
35 //config: bool "Enable long options"
37 //config: depends on ENV && LONG_OPTS
39 //applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
41 //kbuild:lib-$(CONFIG_ENV) += env.o
43 /* BB_AUDIT SUSv3 compliant */
44 /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
46 //usage:#define env_trivial_usage
47 //usage: "[-iu] [-] [name=value]... [PROG ARGS]"
48 //usage:#define env_full_usage "\n\n"
49 //usage: "Print the current environment or run PROG after setting up\n"
50 //usage: "the specified environment\n"
51 //usage: "\n -, -i Start with an empty environment"
52 //usage: "\n -u Remove variable from the environment"
56 #if ENABLE_FEATURE_ENV_LONG_OPTIONS
57 static const char env_longopts[] ALIGN1 =
58 "ignore-environment\0" No_argument "i"
59 "unset\0" Required_argument "u"
63 int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
64 int env_main(int argc UNUSED_PARAM, char **argv)
67 llist_t *unset_env = NULL;
69 #if ENABLE_FEATURE_ENV_LONG_OPTIONS
70 applet_long_options = env_longopts;
72 opts = getopt32(argv, "+iu:+", &unset_env);
74 if (argv[0] && LONE_DASH(argv[0])) {
82 char *var = llist_pop(&unset_env);
83 /* This does not handle -uVAR=VAL
84 * (coreutils _sets_ the variable in that case): */
86 /* This does, but uses somewhan undocumented feature that
87 * putenv("name_without_equal_sign") unsets the variable: */
91 while (*argv && (strchr(*argv, '=') != NULL)) {
92 if (putenv(*argv) < 0) {
93 bb_perror_msg_and_die("putenv");
99 BB_EXECVP_or_die(argv);
102 if (environ) { /* clearenv() may set environ == NULL! */
104 for (ep = environ; *ep; ep++) {
109 fflush_stdout_and_exit(EXIT_SUCCESS);
113 * Copyright (c) 1988, 1993, 1994
114 * The Regents of the University of California. All rights reserved.
116 * Redistribution and use in source and binary forms, with or without
117 * modification, are permitted provided that the following conditions
119 * 1. Redistributions of source code must retain the above copyright
120 * notice, this list of conditions and the following disclaimer.
121 * 2. Redistributions in binary form must reproduce the above copyright
122 * notice, this list of conditions and the following disclaimer in the
123 * documentation and/or other materials provided with the distribution.
125 * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
126 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
128 * 4. Neither the name of the University nor the names of its contributors
129 * may be used to endorse or promote products derived from this software
130 * without specific prior written permission.
132 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
133 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
134 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
135 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
136 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
137 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
138 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
139 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
140 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
141 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF