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annotate util-src/pposix.c @ 796:63f56696c66c

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util.pposix: Fix incompatible pointer type compiler warnings
author Matthew Wild <mwild1@gmail.com>
date Fri, 13 Feb 2009 15:01:46 +0000
parents 433a5226267f
children 9bc1544c99b7
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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 const char * const facility_strings[] = {
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89 "auth",
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90 "authpriv",
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91 "cron",
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92 "daemon",
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93 "ftp",
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94 "kern",
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95 "local0",
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96 "local1",
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97 "local2",
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98 "local3",
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99 "local4",
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100 "local5",
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101 "local6",
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102 "local7",
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103 "lpr",
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104 "mail",
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105 "syslog",
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106 "user",
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107 "uucp",
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108 NULL
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109 };
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110 int facility_constants[] = {
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111 LOG_AUTH,
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112 LOG_AUTHPRIV,
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113 LOG_CRON,
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114 LOG_DAEMON,
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115 LOG_FTP,
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116 LOG_KERN,
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117 LOG_LOCAL0,
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118 LOG_LOCAL1,
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119 LOG_LOCAL2,
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120 LOG_LOCAL3,
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121 LOG_LOCAL4,
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122 LOG_LOCAL5,
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123 LOG_LOCAL6,
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124 LOG_LOCAL7,
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125 LOG_LPR,
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126 LOG_MAIL,
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127 LOG_NEWS,
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128 LOG_SYSLOG,
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129 LOG_USER,
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130 LOG_UUCP,
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131 -1
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132 };
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133
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134 /* "
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135 The parameter ident in the call of openlog() is probably stored as-is.
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136 Thus, if the string it points to is changed, syslog() may start
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137 prepending the changed string, and if the string it points to ceases to
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138 exist, the results are undefined. Most portable is to use a string
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139 constant.
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140 " -- syslog manpage
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141 */
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142 char* syslog_ident = NULL;
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143
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144 int lc_syslog_open(lua_State* L)
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145 {
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146 int facility = luaL_checkoption(L, 2, "daemon", facility_strings);
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147 facility = facility_constants[facility];
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148
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149 luaL_checkstring(L, 1);
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150
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151 if(syslog_ident)
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152 free(syslog_ident);
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153
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154 syslog_ident = strdup(lua_tostring(L, 1));
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155
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156 openlog(syslog_ident, LOG_PID, facility);
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157 return 0;
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158 }
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159
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160 const char * const level_strings[] = {
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161 "debug",
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162 "info",
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163 "notice",
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164 "warn",
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165 "error",
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166 NULL
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167 };
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168 int level_constants[] = {
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169 LOG_DEBUG,
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170 LOG_INFO,
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171 LOG_NOTICE,
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172 LOG_WARNING,
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173 LOG_EMERG,
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174 -1
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175 };
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176 int lc_syslog_log(lua_State* L)
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177 {
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178 int level = luaL_checkoption(L, 1, "notice", level_strings);
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179 level = level_constants[level];
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180
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181 luaL_checkstring(L, 2);
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182
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183 syslog(level, "%s", lua_tostring(L, 2));
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184 return 0;
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185 }
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186
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187 int lc_syslog_close(lua_State* L)
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188 {
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189 closelog();
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190 if(syslog_ident)
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191 {
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192 free(syslog_ident);
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193 syslog_ident = NULL;
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194 }
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195 return 0;
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196 }
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197
729
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198 int lc_syslog_setmask(lua_State* L)
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199 {
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200 int level_idx = luaL_checkoption(L, 1, "notice", level_strings);
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201 int mask = 0;
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202 do
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203 {
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204 mask |= LOG_MASK(level_constants[level_idx]);
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205 } while (++level_idx<=4);
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206
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207 setlogmask(mask);
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208 return 0;
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209 }
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210
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211 /* getpid */
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212
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213 int lc_getpid(lua_State* L)
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214 {
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215 lua_pushinteger(L, getpid());
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216 return 1;
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217 }
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218
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219 /* Register functions */
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220
586
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221 int luaopen_util_pposix(lua_State *L)
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222 {
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223 lua_newtable(L);
722
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224
723
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225 lua_pushcfunction(L, lc_daemonize);
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226 lua_setfield(L, -2, "daemonize");
722
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227
723
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228 lua_pushcfunction(L, lc_syslog_open);
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229 lua_setfield(L, -2, "syslog_open");
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230
723
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231 lua_pushcfunction(L, lc_syslog_close);
722
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232 lua_setfield(L, -2, "syslog_close");
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233
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234 lua_pushcfunction(L, lc_syslog_log);
722
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235 lua_setfield(L, -2, "syslog_log");
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236
729
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237 lua_pushcfunction(L, lc_syslog_setmask);
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238 lua_setfield(L, -2, "syslog_setminlevel");
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239
723
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240 lua_pushcfunction(L, lc_getpid);
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241 lua_setfield(L, -2, "getpid");
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242
727
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diff changeset
243 lua_pushliteral(L, "pposix");
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244 lua_setfield(L, -2, "_NAME");
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245
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diff changeset
246 lua_pushliteral(L, MODULE_VERSION);
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diff changeset
247 lua_setfield(L, -2, "_VERSION");
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248
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249 return 1;
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250 };