env.c 4.3 KB

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  1. /* vi: set sw=4 ts=4: */
  2. /*
  3. * env implementation for busybox
  4. *
  5. * Copyright (c) 1988, 1993, 1994
  6. * The Regents of the University of California. All rights reserved.
  7. *
  8. * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  9. *
  10. * Original copyright notice is retained at the end of this file.
  11. *
  12. * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
  13. */
  14. /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
  15. *
  16. * Fixed bug involving exit return codes if execvp fails. Also added
  17. * output error checking.
  18. */
  19. /*
  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
  25. */
  26. //config:config ENV
  27. //config: bool "env (4 kb)"
  28. //config: default y
  29. //config: help
  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.
  33. //applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
  34. //kbuild:lib-$(CONFIG_ENV) += env.o
  35. /* BB_AUDIT SUSv3 compliant */
  36. /* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
  37. //usage:#define env_trivial_usage
  38. //usage: "[-iu] [-] [name=value]... [PROG ARGS]"
  39. //usage:#define env_full_usage "\n\n"
  40. //usage: "Print the current environment or run PROG after setting up\n"
  41. //usage: "the specified environment\n"
  42. //usage: "\n -, -i Start with an empty environment"
  43. //usage: "\n -u Remove variable from the environment"
  44. #include "libbb.h"
  45. int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  46. int env_main(int argc UNUSED_PARAM, char **argv)
  47. {
  48. unsigned opts;
  49. llist_t *unset_env = NULL;
  50. opts = getopt32long(argv, "+iu:*",
  51. "ignore-environment\0" No_argument "i"
  52. "unset\0" Required_argument "u"
  53. , &unset_env
  54. );
  55. argv += optind;
  56. if (argv[0] && LONE_DASH(argv[0])) {
  57. opts |= 1;
  58. ++argv;
  59. }
  60. if (opts & 1) {
  61. clearenv();
  62. }
  63. while (unset_env) {
  64. char *var = llist_pop(&unset_env);
  65. /* This does not handle -uVAR=VAL
  66. * (coreutils _sets_ the variable in that case): */
  67. /*unsetenv(var);*/
  68. /* This does, but uses somewhan undocumented feature that
  69. * putenv("name_without_equal_sign") unsets the variable: */
  70. putenv(var);
  71. }
  72. while (*argv && (strchr(*argv, '=') != NULL)) {
  73. if (putenv(*argv) < 0) {
  74. bb_simple_perror_msg_and_die("putenv");
  75. }
  76. ++argv;
  77. }
  78. if (argv[0]) {
  79. BB_EXECVP_or_die(argv);
  80. }
  81. if (environ) { /* clearenv() may set environ == NULL! */
  82. char **ep;
  83. for (ep = environ; *ep; ep++) {
  84. puts(*ep);
  85. }
  86. }
  87. fflush_stdout_and_exit(EXIT_SUCCESS);
  88. }
  89. /*
  90. * Copyright (c) 1988, 1993, 1994
  91. * The Regents of the University of California. All rights reserved.
  92. *
  93. * Redistribution and use in source and binary forms, with or without
  94. * modification, are permitted provided that the following conditions
  95. * are met:
  96. * 1. Redistributions of source code must retain the above copyright
  97. * notice, this list of conditions and the following disclaimer.
  98. * 2. Redistributions in binary form must reproduce the above copyright
  99. * notice, this list of conditions and the following disclaimer in the
  100. * documentation and/or other materials provided with the distribution.
  101. *
  102. * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
  103. * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
  104. *
  105. * 4. Neither the name of the University nor the names of its contributors
  106. * may be used to endorse or promote products derived from this software
  107. * without specific prior written permission.
  108. *
  109. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND
  110. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  111. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  112. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  113. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  114. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  115. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  116. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  117. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  118. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  119. * SUCH DAMAGE.
  120. */