Mercurial > dovecot > core-2.2
annotate src/master/dict-process.c @ 8649:67c08c386702 HEAD
Added dict_process_count setting for creating multiple dict processes.
author | Timo Sirainen <tss@iki.fi> |
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date | Sat, 17 Jan 2009 13:56:24 -0500 |
parents | 3cccf56e802a |
children | 49ad944c5741 |
rev | line source |
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Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2006-2009 Dovecot authors, see the included COPYING file */ |
3855 | 2 |
3 #include "common.h" | |
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4 #include "array.h" |
3855 | 5 #include "ioloop.h" |
6 #include "network.h" | |
7 #include "fd-close-on-exec.h" | |
8 #include "env-util.h" | |
9 #include "log.h" | |
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10 #include "child-process.h" |
3855 | 11 #include "dict-process.h" |
12 | |
13 #include <syslog.h> | |
14 #include <unistd.h> | |
15 #include <sys/stat.h> | |
16 | |
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17 #define DICT_SERVER_SOCKET_NAME "dict-server" |
3855 | 18 |
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19 struct dict_listener { |
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20 char *path; |
3855 | 21 int fd; |
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22 struct io *io; |
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23 |
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24 struct dict_process *processes; |
3855 | 25 }; |
26 | |
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27 struct dict_process { |
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28 struct child_process process; |
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29 struct dict_process *next; |
3855 | 30 |
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31 struct dict_listener *listener; |
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32 struct log_io *log; |
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33 }; |
3855 | 34 |
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35 static struct dict_listener *dict_listener; |
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36 |
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37 static int dict_process_create(struct dict_listener *listener) |
3855 | 38 { |
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39 struct dict_process *process; |
3855 | 40 struct log_io *log; |
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41 const char *executable, *const *dicts; |
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42 unsigned int i, count; |
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43 int log_fd; |
3855 | 44 pid_t pid; |
45 | |
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46 process = i_new(struct dict_process, 1); |
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47 process->process.type = PROCESS_TYPE_DICT; |
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48 process->listener = listener; |
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49 |
3855 | 50 log_fd = log_create_pipe(&log, 0); |
51 if (log_fd < 0) | |
52 pid = -1; | |
53 else { | |
54 pid = fork(); | |
55 if (pid < 0) | |
56 i_error("fork() failed: %m"); | |
57 } | |
58 | |
59 if (pid < 0) { | |
60 (void)close(log_fd); | |
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61 i_free(process); |
3855 | 62 return -1; |
63 } | |
64 | |
65 if (pid != 0) { | |
66 /* master */ | |
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67 process->next = process->listener->processes; |
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68 process->listener->processes = process; |
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69 |
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70 child_process_add(pid, &process->process); |
3855 | 71 log_set_prefix(log, "dict: "); |
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72 log_set_pid(log, pid); |
3855 | 73 (void)close(log_fd); |
74 | |
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75 process->log = log; |
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76 log_ref(process->log); |
3855 | 77 return 0; |
78 } | |
79 log_set_prefix(log, "master-dict: "); | |
80 | |
81 /* set stdin and stdout to /dev/null, so anything written into it | |
82 gets ignored. */ | |
83 if (dup2(null_fd, 0) < 0) | |
84 i_fatal("dup2(stdin) failed: %m"); | |
85 if (dup2(null_fd, 1) < 0) | |
86 i_fatal("dup2(stdout) failed: %m"); | |
87 | |
88 /* stderr = log, 3 = listener */ | |
89 if (dup2(log_fd, 2) < 0) | |
90 i_fatal("dup2(stderr) failed: %m"); | |
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91 if (dup2(process->listener->fd, 3) < 0) |
3855 | 92 i_fatal("dup2(3) failed: %m"); |
93 | |
94 for (i = 0; i <= 3; i++) | |
95 fd_close_on_exec(i, FALSE); | |
96 | |
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97 child_process_init_env(); |
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98 env_put(t_strconcat("DICT_LISTEN_FROM_FD=", |
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99 process->listener->path, NULL)); |
3855 | 100 |
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101 if (settings_root->defaults->dict_db_config != NULL) { |
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102 env_put(t_strconcat("DB_CONFIG=", |
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103 settings_root->defaults->dict_db_config, |
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104 NULL)); |
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105 } |
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106 |
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107 dicts = array_get(&settings_root->dicts, &count); |
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108 i_assert((count % 2) == 0); |
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109 for (i = 0; i < count; i += 2) |
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110 env_put(t_strdup_printf("DICT_%s=%s", dicts[i], dicts[i+1])); |
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111 |
3855 | 112 /* make sure we don't leak syslog fd, but do it last so that |
113 any errors above will be logged */ | |
114 closelog(); | |
115 | |
116 executable = PKG_LIBEXECDIR"/dict"; | |
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117 client_process_exec(executable, ""); |
3855 | 118 i_fatal_status(FATAL_EXEC, "execv(%s) failed: %m", executable); |
119 return -1; | |
120 } | |
121 | |
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122 static void dict_process_deinit(struct dict_process *process) |
3855 | 123 { |
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124 struct dict_process **p; |
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125 |
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126 for (p = &process->listener->processes; *p != NULL; p++) { |
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127 if (*p == process) { |
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128 *p = process->next; |
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129 break; |
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130 } |
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131 } |
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132 |
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133 if (process->log != NULL) |
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134 log_unref(process->log); |
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135 i_free(process); |
3855 | 136 } |
137 | |
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138 static void dict_listener_input(struct dict_listener *listener) |
3855 | 139 { |
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140 unsigned int i; |
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141 int fd; |
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142 |
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143 i_assert(listener->processes == NULL); |
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144 |
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145 for (i = 0; i < settings_root->defaults->dict_process_count; i++) { |
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146 if (dict_process_create(listener) < 0) |
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147 break; |
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148 } |
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149 if (i > 0) |
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150 io_remove(&listener->io); |
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151 else { |
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152 /* failed to create dict process, so just reject this |
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153 connection and try again later */ |
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154 fd = net_accept(listener->fd, NULL, NULL); |
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155 if (fd >= 0) |
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156 (void)close(fd); |
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157 } |
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158 } |
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159 |
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160 static struct dict_listener *dict_listener_init(const char *path) |
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161 { |
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162 struct dict_listener *listener; |
3855 | 163 mode_t old_umask; |
164 | |
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165 listener = i_new(struct dict_listener, 1); |
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166 listener->path = i_strdup(path); |
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167 old_umask = umask(0); |
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168 listener->fd = net_listen_unix_unlink_stale(path, 128); |
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169 umask(old_umask); |
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170 if (listener->fd == -1) { |
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171 if (errno == EADDRINUSE) |
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172 i_fatal("Socket already exists: %s", path); |
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173 else |
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174 i_fatal("net_listen_unix(%s) failed: %m", path); |
3855 | 175 } |
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176 fd_close_on_exec(listener->fd, TRUE); |
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177 listener->io = io_add(listener->fd, IO_READ, |
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178 dict_listener_input, listener); |
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179 return listener; |
3855 | 180 } |
181 | |
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182 static void dict_listener_deinit(struct dict_listener *listener) |
3855 | 183 { |
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184 if (listener->io != NULL) |
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185 io_remove(&listener->io); |
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186 if (close(listener->fd) < 0) |
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187 i_error("close(dict listener) failed: %m"); |
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189 while (listener->processes != NULL) |
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190 dict_process_deinit(listener->processes); |
3855 | 191 } |
192 | |
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193 static void |
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194 dict_process_destroyed(struct child_process *_process, |
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195 pid_t pid ATTR_UNUSED, bool abnormal_exit ATTR_UNUSED) |
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196 { |
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197 struct dict_process *process = (struct dict_process *)_process; |
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198 struct dict_listener *listener = process->listener; |
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199 |
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200 dict_process_deinit(process); |
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201 if (listener->processes == NULL) { |
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202 /* last listener died, create new ones */ |
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203 listener->io = io_add(listener->fd, IO_READ, |
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204 dict_listener_input, listener); |
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205 } |
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206 } |
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207 |
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208 void dict_processes_init(void) |
3855 | 209 { |
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210 const char *path; |
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211 |
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212 path = t_strconcat(settings_root->defaults->base_dir, |
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213 "/"DICT_SERVER_SOCKET_NAME, NULL); |
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214 dict_listener = dict_listener_init(path); |
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215 |
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216 child_process_set_destroy_callback(PROCESS_TYPE_DICT, |
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217 dict_process_destroyed); |
3855 | 218 } |
219 | |
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220 void dict_processes_deinit(void) |
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222 dict_listener_deinit(dict_listener); |
3855 | 223 } |
224 | |
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225 void dict_processes_kill(void) |
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226 { |
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227 struct dict_process *process; |
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228 |
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229 process = dict_listener->processes; |
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230 for (; process != NULL; process = process->next) { |
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231 if (process->log != NULL) { |
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232 log_unref(process->log); |
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233 process->log = NULL; |
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234 } |
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235 } |
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236 } |