prosody
a4be1d80775c
util-src/pposix.c

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util-src/pposix.c @ 791:a4be1d80775c

Fixed: kick_old resource conflict resolution policy could fail with a backtrace
author Waqas Hussain <waqas20@gmail.com>
date Thu, 12 Feb 2009 18:23:00 +0500
parent 766:433a5226267f
child 796:63f56696c66c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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766
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1 /* Prosody IM v0.3
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8 */
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9
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10 /*
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11 * pposix.c
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12 * POSIX support functions for Lua
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13 */
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14
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15 #define MODULE_VERSION "0.3.0"
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16
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17 #include <stdlib.h>
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18 #include <unistd.h>
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19 #include <libgen.h>
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20 #include <sys/types.h>
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21 #include <sys/stat.h>
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22 #include <fcntl.h>
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23
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24 #include <syslog.h>
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25
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26 #include <string.h>
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27
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28 #include "lua.h"
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29 #include "lauxlib.h"
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30
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31 /* Daemonization support */
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32
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33 static int lc_daemonize(lua_State *L)
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34 {
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35
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36 pid_t pid;
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37
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38 if ( getppid() == 1 )
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39 {
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40 lua_pushboolean(L, 0);
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41 lua_pushstring(L, "already-daemonized");
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42 return 2;
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43 }
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44
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45 /* Attempt initial fork */
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46 if((pid = fork()) < 0)
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47 {
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48 /* Forking failed */
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49 lua_pushboolean(L, 0);
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50 lua_pushstring(L, "fork-failed");
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51 return 2;
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52 }
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53 else if(pid != 0)
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54 {
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55 /* We are the parent process */
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56 lua_pushboolean(L, 1);
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57 lua_pushnumber(L, pid);
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58 return 2;
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59 }
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60
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61 /* and we are the child process */
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62 if(setsid() == -1)
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63 {
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64 /* We failed to become session leader */
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65 /* (we probably already were) */
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66 lua_pushboolean(L, 0);
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67 lua_pushstring(L, "setsid-failed");
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68 return 2;
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69 }
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70
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71 /* Close stdin, stdout, stderr */
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72 /* close(0);
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73 close(1);
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74 close(2);
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75 */
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76 /* Final fork, use it wisely */
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77 if(fork())
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78 exit(0);
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79
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80 /* Show's over, let's continue */
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81 lua_pushboolean(L, 1);
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82 lua_pushnil(L);
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83 return 2;
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84 }
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85
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86 /* Syslog support */
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87
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88 char *facility_strings[] = { "auth",
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89 "authpriv",
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90 "cron",
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91 "daemon",
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92 "ftp",
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93 "kern",
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94 "local0",
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95 "local1",
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96 "local2",
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97 "local3",
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98 "local4",
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99 "local5",
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100 "local6",
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101 "local7",
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102 "lpr",
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103 "mail",
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104 "syslog",
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105 "user",
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106 "uucp",
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107 NULL
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108 };
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109 int facility_constants[] = {
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110 LOG_AUTH,
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111 LOG_AUTHPRIV,
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112 LOG_CRON,
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113 LOG_DAEMON,
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114 LOG_FTP,
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115 LOG_KERN,
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116 LOG_LOCAL0,
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117 LOG_LOCAL1,
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118 LOG_LOCAL2,
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119 LOG_LOCAL3,
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120 LOG_LOCAL4,
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121 LOG_LOCAL5,
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122 LOG_LOCAL6,
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123 LOG_LOCAL7,
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124 LOG_LPR,
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125 LOG_MAIL,
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126 LOG_NEWS,
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127 LOG_SYSLOG,
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128 LOG_USER,
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129 LOG_UUCP,
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130 -1
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131 };
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132
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133 /* "
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134 The parameter ident in the call of openlog() is probably stored as-is.
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135 Thus, if the string it points to is changed, syslog() may start
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136 prepending the changed string, and if the string it points to ceases to
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137 exist, the results are undefined. Most portable is to use a string
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138 constant.
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139 " -- syslog manpage
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140 */
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141 char* syslog_ident = NULL;
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142
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143 int lc_syslog_open(lua_State* L)
722
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144 {
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145 int facility = luaL_checkoption(L, 2, "daemon", &facility_strings);
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146 facility = facility_constants[facility];
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147
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148 luaL_checkstring(L, 1);
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149
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150 if(syslog_ident)
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151 free(syslog_ident);
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152
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153 syslog_ident = strdup(lua_tostring(L, 1));
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154
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155 openlog(syslog_ident, LOG_PID, facility);
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156 return 0;
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157 }
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158
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159 char *level_strings[] = {
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160 "debug",
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161 "info",
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162 "notice",
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163 "warn",
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164 "error",
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165 NULL
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166 };
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167 int level_constants[] = {
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168 LOG_DEBUG,
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169 LOG_INFO,
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170 LOG_NOTICE,
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171 LOG_WARNING,
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172 LOG_EMERG,
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173 -1
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174 };
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175 int lc_syslog_log(lua_State* L)
722
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176 {
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177 int level = luaL_checkoption(L, 1, "notice", &level_strings);
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178 level = level_constants[level];
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179
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180 luaL_checkstring(L, 2);
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181
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182 syslog(level, "%s", lua_tostring(L, 2));
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183 return 0;
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184 }
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185
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186 int lc_syslog_close(lua_State* L)
722
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187 {
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188 closelog();
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189 if(syslog_ident)
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190 {
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191 free(syslog_ident);
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192 syslog_ident = NULL;
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193 }
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194 return 0;
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195 }
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196
729
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197 int lc_syslog_setmask(lua_State* L)
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198 {
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199 int level_idx = luaL_checkoption(L, 1, "notice", &level_strings);
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200 int mask = 0;
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201 do
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202 {
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203 mask |= LOG_MASK(level_constants[level_idx]);
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204 } while (++level_idx<=4);
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205
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206 setlogmask(mask);
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207 return 0;
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208 }
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209
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210 /* getpid */
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211
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212 int lc_getpid(lua_State* L)
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213 {
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214 lua_pushinteger(L, getpid());
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215 return 1;
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216 }
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217
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218 /* Register functions */
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219
586
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220 int luaopen_util_pposix(lua_State *L)
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221 {
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222 lua_newtable(L);
722
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223
723
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224 lua_pushcfunction(L, lc_daemonize);
586
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225 lua_setfield(L, -2, "daemonize");
722
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226
723
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227 lua_pushcfunction(L, lc_syslog_open);
722
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228 lua_setfield(L, -2, "syslog_open");
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229
723
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230 lua_pushcfunction(L, lc_syslog_close);
722
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diff changeset
231 lua_setfield(L, -2, "syslog_close");
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232
723
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233 lua_pushcfunction(L, lc_syslog_log);
722
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234 lua_setfield(L, -2, "syslog_log");
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235
729
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diff changeset
236 lua_pushcfunction(L, lc_syslog_setmask);
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diff changeset
237 lua_setfield(L, -2, "syslog_setminlevel");
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238
723
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239 lua_pushcfunction(L, lc_getpid);
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240 lua_setfield(L, -2, "getpid");
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241
727
78c9542de94e pposix: Add _NAME and _VERSION
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diff changeset
242 lua_pushliteral(L, "pposix");
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diff changeset
243 lua_setfield(L, -2, "_NAME");
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diff changeset
244
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diff changeset
245 lua_pushliteral(L, MODULE_VERSION);
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diff changeset
246 lua_setfield(L, -2, "_VERSION");
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diff changeset
247
586
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248 return 1;
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249 };