Mercurial > dovecot > core-2.2

annotate src/lib/lib.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 f4076be3efe9
children cb108f786fb4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
21390
2e2563132d5f Updated copyright notices to include the year 2017.
Stephan Bosch <stephan.bosch@dovecot.fi>
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1 /* Copyright (c) 2001-2017 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 "dovecot-version.h"
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5 #include "array.h"
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6 #include "env-util.h"
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7 #include "hostpid.h"
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8 #include "fd-close-on-exec.h"
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9 #include "ipwd.h"
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10 #include "process-title.h"
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954374379116 lib: Add extension support for var-expand
Aki Tuomi <aki.tuomi@dovecot.fi>
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11 #include "var-expand-private.h"
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12
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13 #include <fcntl.h>
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14 #include <unistd.h>
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15 #include <sys/time.h>
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16
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17 /* Mainly for including the full version information in core dumps.
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18 NOTE: Don't set this const - otherwise it won't end up in core dumps. */
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19 char dovecot_build_info[] = DOVECOT_BUILD_INFO;
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20
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21 static bool lib_initialized = FALSE;
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22 int dev_null_fd = -1;
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23
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24 struct atexit_callback {
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25 int priority;
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26 lib_atexit_callback_t *callback;
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27 };
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28
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29 static ARRAY(struct atexit_callback) atexit_callbacks = ARRAY_INIT;
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30
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31 int close_keep_errno(int *fd)
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32 {
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33 int ret, old_errno = errno;
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34
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35 i_assert(*fd != -1);
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36
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37 ret = close(*fd);
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38 *fd = -1;
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39 errno = old_errno;
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40 return ret;
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41 }
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42
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43 void fd_close_maybe_stdio(int *fd_in, int *fd_out)
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44 {
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45 int *fdp[2] = { fd_in, fd_out };
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46
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47 if (*fd_in == *fd_out)
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48 *fd_in = -1;
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49
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50 for (unsigned int i = 0; i < N_ELEMENTS(fdp); i++) {
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51 if (*fdp[i] == -1)
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52 ;
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53 else if (*fdp[i] > 1)
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54 i_close_fd(fdp[i]);
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55 else if (dup2(dev_null_fd, *fdp[i]) == *fdp[i])
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56 *fdp[i] = -1;
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57 else
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58 i_fatal("dup2(/dev/null, %d) failed: %m", *fdp[i]);
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59 }
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60 }
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61
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62 #undef i_unlink
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63 int i_unlink(const char *path, const char *source_fname,
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64 unsigned int source_linenum)
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65 {
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66 if (unlink(path) < 0) {
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67 i_error("unlink(%s) failed: %m (in %s:%u)",
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68 path, source_fname, source_linenum);
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69 return -1;
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70 }
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71 return 0;
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72 }
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73
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74 #undef i_unlink_if_exists
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75 int i_unlink_if_exists(const char *path, const char *source_fname,
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76 unsigned int source_linenum)
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77 {
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78 if (unlink(path) == 0)
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79 return 1;
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80 else if (errno == ENOENT)
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81 return 0;
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82 else {
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83 i_error("unlink(%s) failed: %m (in %s:%u)",
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84 path, source_fname, source_linenum);
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85 return -1;
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86 }
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87 }
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88
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89 void i_getopt_reset(void)
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90 {
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91 #ifdef __GLIBC__
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92 /* a) for subcommands allow -options anywhere in command line
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93 b) this is actually required for the reset to work (glibc bug?) */
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94 optind = 0;
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95 #else
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96 optind = 1;
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97 #endif
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98 }
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99
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100 void lib_atexit(lib_atexit_callback_t *callback)
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101 {
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102 lib_atexit_priority(callback, 0);
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103 }
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104
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105 void lib_atexit_priority(lib_atexit_callback_t *callback, int priority)
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106 {
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107 struct atexit_callback *cb;
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108 const struct atexit_callback *callbacks;
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109 unsigned int i, count;
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110
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111 if (!array_is_created(&atexit_callbacks))
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112 i_array_init(&atexit_callbacks, 8);
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113 else {
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114 /* skip if it's already added */
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115 callbacks = array_get(&atexit_callbacks, &count);
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116 for (i = count; i > 0; i--) {
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117 if (callbacks[i-1].callback == callback) {
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118 i_assert(callbacks[i-1].priority == priority);
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119 return;
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120 }
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121 }
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122 }
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123 cb = array_append_space(&atexit_callbacks);
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124 cb->priority = priority;
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125 cb->callback = callback;
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126 }
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127
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128 static int atexit_callback_priority_cmp(const struct atexit_callback *cb1,
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129 const struct atexit_callback *cb2)
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130 {
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131 return cb1->priority - cb2->priority;
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132 }
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133
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134 void lib_atexit_run(void)
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135 {
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136 const struct atexit_callback *cb;
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137
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138 if (array_is_created(&atexit_callbacks)) {
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139 array_sort(&atexit_callbacks, atexit_callback_priority_cmp);
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140 array_foreach(&atexit_callbacks, cb)
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141 (*cb->callback)();
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142 array_free(&atexit_callbacks);
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143 }
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144 }
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145
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146 static void lib_open_non_stdio_dev_null(void)
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147 {
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148 dev_null_fd = open("/dev/null", O_WRONLY);
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149 if (dev_null_fd == -1)
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150 i_fatal("open(/dev/null) failed: %m");
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151 /* Make sure stdin, stdout and stderr fds exist. We especially rely on
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152 stderr being available and a lot of code doesn't like fd being 0.
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153 We'll open /dev/null as write-only also for stdin, since if any
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154 reads are attempted from it we'll want them to fail. */
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155 while (dev_null_fd < STDERR_FILENO) {
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156 dev_null_fd = dup(dev_null_fd);
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157 if (dev_null_fd == -1)
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158 i_fatal("dup(/dev/null) failed: %m");
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159 }
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160 /* close the actual /dev/null fd on exec*(), but keep it in stdio fds */
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161 fd_close_on_exec(dev_null_fd, TRUE);
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162 }
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163
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164 void lib_init(void)
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165 {
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166 struct timeval tv;
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167 i_assert(!lib_initialized);
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168
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169 /* standard way to get rand() return different values. */
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170 if (gettimeofday(&tv, NULL) < 0)
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171 i_fatal("gettimeofday(): %m");
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172 rand_set_seed((unsigned int) (tv.tv_sec ^ tv.tv_usec ^ getpid()));
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173
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174 data_stack_init();
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175 hostpid_init();
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176 lib_open_non_stdio_dev_null();
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177 var_expand_extensions_init();
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178
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179 lib_initialized = TRUE;
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180 }
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181
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182 bool lib_is_initialized(void)
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183 {
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184 return lib_initialized;
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185 }
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186
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187 void lib_deinit(void)
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188 {
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189 i_assert(lib_initialized);
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190 lib_initialized = FALSE;
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191 lib_atexit_run();
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192 ipwd_deinit();
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193 hostpid_deinit();
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194 var_expand_extensions_deinit();
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195 i_close_fd(&dev_null_fd);
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196 data_stack_deinit();
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197 env_deinit();
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198 failures_deinit();
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199 process_title_deinit();
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200 }