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 tarball for details.
10 * Original copyright notice is retained at the end of this file.
12 * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
15 /* BB_AUDIT SUSv3 compliant */
16 /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
18 /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
20 * Fixed bug involving exit return codes if execvp fails. Also added
21 * output error checking.
25 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
26 * - correct "-" option usage
27 * - multiple "-u unsetenv" support
28 * - GNU long option support
29 * - use xfunc_error_retval
32 /* This is a NOEXEC applet. Be very careful! */
36 #if ENABLE_FEATURE_ENV_LONG_OPTIONS
37 static const char env_longopts[] ALIGN1 =
38 "ignore-environment\0" No_argument "i"
39 "unset\0" Required_argument "u"
43 int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44 int env_main(int argc UNUSED_PARAM, char **argv)
48 llist_t *unset_env = NULL;
50 opt_complementary = "u::";
51 #if ENABLE_FEATURE_ENV_LONG_OPTIONS
52 applet_long_options = env_longopts;
54 opt = getopt32(argv, "+iu:", &unset_env);
56 if (*argv && LONE_DASH(argv[0])) {
64 char *var = llist_pop(&unset_env);
65 /* This does not handle -uVAR=VAL
66 * (coreutils _sets_ the variable in that case): */
68 /* This does, but uses somewhan undocumented feature that
69 * putenv("name_without_equal_sign") unsets the variable: */
73 while (*argv && (strchr(*argv, '=') != NULL)) {
74 if (putenv(*argv) < 0) {
75 bb_perror_msg_and_die("putenv");
81 BB_EXECVP(*argv, argv);
82 /* SUSv3-mandated exit codes. */
83 xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
84 bb_simple_perror_msg_and_die(*argv);
87 for (ep = environ; *ep; ep++) {
91 fflush_stdout_and_exit(EXIT_SUCCESS);
95 * Copyright (c) 1988, 1993, 1994
96 * The Regents of the University of California. All rights reserved.
98 * Redistribution and use in source and binary forms, with or without
99 * modification, are permitted provided that the following conditions
101 * 1. Redistributions of source code must retain the above copyright
102 * notice, this list of conditions and the following disclaimer.
103 * 2. Redistributions in binary form must reproduce the above copyright
104 * notice, this list of conditions and the following disclaimer in the
105 * documentation and/or other materials provided with the distribution.
107 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
108 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
110 * 4. Neither the name of the University nor the names of its contributors
111 * may be used to endorse or promote products derived from this software
112 * without specific prior written permission.
114 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
115 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
116 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
117 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
118 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
119 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
120 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
121 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
122 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
123 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF