Mercurial > dovecot > core-2.2

annotate src/lib/env-util.c @ 22664:fea53c2725c0

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director: Fix director_max_parallel_moves/kicks type Should be uint, not time.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 09 Nov 2017 12:24:16 +0200
parents 2e2563132d5f
children cb108f786fb4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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2e2563132d5f Updated copyright notices to include the year 2017.
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1 /* Copyright (c) 2002-2017 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "array.h"
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5 #include "env-util.h"
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6
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7 #ifdef __APPLE__
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8 # include <crt_externs.h>
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9 #endif
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10
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11 struct env_backup {
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12 pool_t pool;
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13 const char **strings;
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14 };
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15
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16 static pool_t env_pool = NULL;
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17
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18 void env_put(const char *env)
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19 {
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20 if (env_pool == NULL) {
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21 env_pool = pool_alloconly_create(MEMPOOL_GROWING"Environment",
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22 2048);
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23 }
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24 if (putenv(p_strdup(env_pool, env)) != 0)
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25 i_fatal("putenv(%s) failed: %m", env);
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26 }
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27
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28 void env_remove(const char *name)
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29 {
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30 #ifdef HAVE_UNSETENV
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31 #ifdef UNSETENV_RET_INT
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32 if (unsetenv(name) < 0)
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33 i_fatal("unsetenv(%s) failed: %m", name);
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34 #else
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35 unsetenv(name);
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36 #endif
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37 #else
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38 extern char **environ;
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39 size_t len;
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40 char **envp;
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41
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42 len = strlen(name);
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43 for (envp = environ; *envp != NULL; envp++) {
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44 if (strncmp(name, *envp, len) == 0 &&
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45 (*envp)[len] == '=') {
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46 do {
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47 envp[0] = envp[1];
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48 } while (*++envp != NULL);
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49 break;
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50 }
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51 }
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52 #endif
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53 }
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54
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55 void env_clean(void)
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56 {
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57 #ifdef HAVE_CLEARENV
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58 if (clearenv() < 0)
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59 i_fatal("clearenv() failed");
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60 #else
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61 char ***environ_p = env_get_environ_p();
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62
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63 /* Try to clear the environment.
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64
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65 a) environ = NULL crashes on OS X.
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66 b) *environ = NULL doesn't work on FreeBSD 7.0.
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67 c) environ = emptyenv doesn't work on Haiku OS
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68 d) environ = calloc() should work everywhere
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69 */
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70 *environ_p = calloc(1, sizeof(**environ_p));
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71 #endif
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72 if (env_pool != NULL)
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73 p_clear(env_pool);
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74 }
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75
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76 static void env_clean_except_real(const char *const preserve_envs[])
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77 {
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78 ARRAY_TYPE(const_string) copy;
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79 const char *value, *const *envp;
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80 unsigned int i;
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81
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82 t_array_init(&copy, 16);
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83 for (i = 0; preserve_envs[i] != NULL; i++) {
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84 const char *key = preserve_envs[i];
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85
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86 value = getenv(key);
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87 if (value != NULL) {
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88 value = t_strconcat(key, "=", value, NULL);
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89 array_append(&copy, &value, 1);
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90 }
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91 }
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92
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93 /* Note that if the original environment was set with env_put(), the
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94 environment strings will be invalid after env_clean(). That's why
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95 we t_strconcat() them above. */
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96 env_clean();
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97
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98 array_foreach(&copy, envp)
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99 env_put(*envp);
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100 }
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101
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102 void env_clean_except(const char *const preserve_envs[])
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103 {
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104 T_BEGIN {
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105 env_clean_except_real(preserve_envs);
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106 } T_END;
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107 }
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108
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109 struct env_backup *env_backup_save(void)
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110 {
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111 char **environ = *env_get_environ_p();
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112 struct env_backup *env;
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113 unsigned int i, count;
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114 pool_t pool;
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115
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116 i_assert(environ != NULL);
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117
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118 for (count = 0; environ[count] != NULL; count++) ;
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119
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120 pool = pool_alloconly_create("saved environment", 4096);
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121 env = p_new(pool, struct env_backup, 1);
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122 env->pool = pool;
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123 env->strings = p_new(pool, const char *, count + 1);
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124 for (i = 0; i < count; i++)
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125 env->strings[i] = p_strdup(pool, environ[i]);
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126 return env;
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127 }
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128
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129 void env_backup_restore(struct env_backup *env)
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130 {
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131 unsigned int i;
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132
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133 env_clean();
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134 for (i = 0; env->strings[i] != NULL; i++)
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135 env_put(env->strings[i]);
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136 }
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137
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138 void env_backup_free(struct env_backup **_env)
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139 {
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140 struct env_backup *env = *_env;
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141
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142 *_env = NULL;
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143 pool_unref(&env->pool);
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144 }
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145
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146 char ***env_get_environ_p(void)
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147 {
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148 #ifdef __APPLE__
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149 return _NSGetEnviron();
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150 #else
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151 extern char **environ;
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152
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153 return &environ;
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154 #endif
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155 }
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156
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157 void env_deinit(void)
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158 {
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159 if (env_pool != NULL)
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160 pool_unref(&env_pool);
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161 }