prosody
c1e7d280c174
util-src/pposix.c

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util-src/pposix.c @ 723:c1e7d280c174

mod_posix/pposix: Fix reporting of incorrect PID on daemonization. Log correct PID, and support writing a pidfile (pidfile = '/path/to/prosody.pid' in config). Added getpid() to pposix and improved function names.
author Matthew Wild <mwild1@gmail.com>
date Thu, 15 Jan 2009 20:59:36 +0000
parent 722:63456c9d0522
child 727:78c9542de94e
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1 /* Prosody IM v0.1
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 */
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19
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20 /* pposix.c
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21 POSIX support functions for Lua
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22 */
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23
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24 #include <stdlib.h>
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25 #include <unistd.h>
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26 #include <libgen.h>
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27 #include <sys/types.h>
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28 #include <sys/stat.h>
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29 #include <fcntl.h>
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30
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31 #include <syslog.h>
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32
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33 #include <string.h>
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34
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35 #include "lua.h"
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36 #include "lauxlib.h"
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37
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38 /* Daemonization support */
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39
723
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40 static int lc_daemonize(lua_State *L)
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41 {
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42
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43 pid_t pid;
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44
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45 if ( getppid() == 1 )
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46 {
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47 lua_pushboolean(L, 0);
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48 lua_pushstring(L, "already-daemonized");
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49 return 2;
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50 }
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51
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52 /* Attempt initial fork */
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53 if((pid = fork()) < 0)
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54 {
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55 /* Forking failed */
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56 lua_pushboolean(L, 0);
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57 lua_pushstring(L, "fork-failed");
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58 return 2;
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59 }
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60 else if(pid != 0)
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61 {
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62 /* We are the parent process */
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63 lua_pushboolean(L, 1);
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64 lua_pushnumber(L, pid);
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65 return 2;
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66 }
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67
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68 /* and we are the child process */
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69 if(setsid() == -1)
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70 {
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71 /* We failed to become session leader */
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72 /* (we probably already were) */
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73 lua_pushboolean(L, 0);
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74 lua_pushstring(L, "setsid-failed");
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75 return 2;
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76 }
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77
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78 /* Close stdin, stdout, stderr */
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79 /* close(0);
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80 close(1);
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81 close(2);
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82 */
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83 /* Final fork, use it wisely */
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84 if(fork())
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85 exit(0);
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86
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87 /* Show's over, let's continue */
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88 lua_pushboolean(L, 1);
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89 lua_pushnil(L);
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90 return 2;
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91 }
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92
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93 /* Syslog support */
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94
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95 char *facility_strings[] = { "auth",
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96 "authpriv",
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97 "cron",
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98 "daemon",
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99 "ftp",
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100 "kern",
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101 "local0",
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102 "local1",
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103 "local2",
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104 "local3",
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105 "local4",
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106 "local5",
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107 "local6",
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108 "local7",
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109 "lpr",
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110 "mail",
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111 "syslog",
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112 "user",
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113 "uucp",
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114 NULL
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115 };
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116 int facility_constants[] = {
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117 LOG_AUTH,
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118 LOG_AUTHPRIV,
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119 LOG_CRON,
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120 LOG_DAEMON,
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121 LOG_FTP,
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122 LOG_KERN,
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123 LOG_LOCAL0,
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124 LOG_LOCAL1,
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125 LOG_LOCAL2,
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126 LOG_LOCAL3,
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127 LOG_LOCAL4,
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128 LOG_LOCAL5,
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129 LOG_LOCAL6,
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130 LOG_LOCAL7,
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131 LOG_LPR,
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132 LOG_MAIL,
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133 LOG_NEWS,
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134 LOG_SYSLOG,
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135 LOG_USER,
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136 LOG_UUCP,
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137 -1
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138 };
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139
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140 /* "
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141 The parameter ident in the call of openlog() is probably stored as-is.
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142 Thus, if the string it points to is changed, syslog() may start
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143 prepending the changed string, and if the string it points to ceases to
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144 exist, the results are undefined. Most portable is to use a string
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145 constant.
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146 " -- syslog manpage
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147 */
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148 char* syslog_ident = NULL;
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149
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150 int lc_syslog_open(lua_State* L)
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151 {
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152 int facility = luaL_checkoption(L, 2, "daemon", &facility_strings);
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153 facility = facility_constants[facility];
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154
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155 luaL_checkstring(L, 1);
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156
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157 if(syslog_ident)
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158 free(syslog_ident);
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159
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160 syslog_ident = strdup(lua_tostring(L, 1));
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161
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162 openlog(syslog_ident, LOG_PID, facility);
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163 return 0;
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164 }
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165
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166 char *level_strings[] = {
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167 "debug",
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168 "info",
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169 "notice",
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170 "warn",
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171 "error",
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172 NULL
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173 };
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174 int level_constants[] = {
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175 LOG_DEBUG,
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176 LOG_INFO,
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177 LOG_NOTICE,
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178 LOG_WARNING,
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179 LOG_EMERG,
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180 -1
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181 };
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182 int lc_syslog_log(lua_State* L)
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183 {
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184 int level = luaL_checkoption(L, 1, "notice", &level_strings);
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185 level = level_constants[level];
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186
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187 luaL_checkstring(L, 2);
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188
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189 syslog(level, "%s", lua_tostring(L, 2));
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190 return 0;
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191 }
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192
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193 int lc_syslog_close(lua_State* L)
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194 {
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195 closelog();
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196 if(syslog_ident)
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197 {
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198 free(syslog_ident);
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199 syslog_ident = NULL;
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200 }
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201 return 0;
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202 }
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203
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204 /* getpid */
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205
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206 int lc_getpid(lua_State* L)
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207 {
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208 lua_pushinteger(L, getpid());
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209 return 1;
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210 }
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211
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212 /* Register functions */
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213
586
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214 int luaopen_util_pposix(lua_State *L)
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215 {
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216 lua_newtable(L);
722
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217
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218 lua_pushcfunction(L, lc_daemonize);
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219 lua_setfield(L, -2, "daemonize");
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220
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221 lua_pushcfunction(L, lc_syslog_open);
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222 lua_setfield(L, -2, "syslog_open");
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223
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224 lua_pushcfunction(L, lc_syslog_close);
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225 lua_setfield(L, -2, "syslog_close");
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226
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227 lua_pushcfunction(L, lc_syslog_log);
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228 lua_setfield(L, -2, "syslog_log");
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229
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230 lua_pushcfunction(L, lc_getpid);
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231 lua_setfield(L, -2, "getpid");
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232
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233 return 1;
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234 };