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annotate src/log.c @ 344:0410c8aabac2

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improved comments and debug messages
author markus schnalke <meillo@marmaro.de>
date Sat, 03 Sep 2011 18:32:37 +0200
parents e507c854a63e
children b27f66555ba8
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1 /* MasqMail
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2 Copyright (C) 1999-2001 Oliver Kurth
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, write to the Free Software
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16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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17 */
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18
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19 #include <sysexits.h>
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20
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21 #include "masqmail.h"
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22
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23 static char *_sysexit_strings[] = {
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24 "command line usage error",
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25 "data format error",
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26 "cannot open input",
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27 "addressee unknown",
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28 "host name unknown",
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29 "service unavailable",
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30 "internal software error",
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31 "system error (e.g., can't fork)",
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32 "critical OS file missing",
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33 "can't create (user) output file",
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34 "input/output error",
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35 "temp failure; user is invited to retry",
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36 "remote error in protocol",
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37 "permission denied",
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38 "configuration error"
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39 };
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40
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41 gchar*
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42 ext_strerror(int err)
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43 {
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44 if (err < 1024)
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45 return strerror(err);
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46 else if (err > 1024 + EX__BASE
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47 && (err - 1024 - EX__BASE < sizeof(_sysexit_strings) / sizeof(_sysexit_strings[0])))
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48 return _sysexit_strings[err - 1024 - EX__BASE];
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49
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50 return "unknown error";
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51 }
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52
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53 static FILE *logfile = NULL;
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54 static FILE *debugfile = NULL;
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55
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56 gboolean
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57 logopen()
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58 {
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59 gchar *filename;
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60 mode_t saved_mode = umask(066);
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61
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62 if (conf.use_syslog) {
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63 openlog(PACKAGE, LOG_PID, LOG_MAIL);
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64 } else {
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65 uid_t saved_uid;
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66 gid_t saved_gid;
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67
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68 if (!conf.run_as_user) {
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69 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
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70 }
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71
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72 filename = g_strdup_printf("%s/masqmail.log", conf.log_dir);
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73 logfile = fopen(filename, "a");
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74 if (!logfile) {
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75 fprintf(stderr, "could not open log '%s': %s\n", filename, strerror(errno));
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76 return FALSE;
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77 }
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78 g_free(filename);
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79
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80 if (!conf.run_as_user) {
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81 set_euidgid(saved_uid, saved_gid, NULL, NULL);
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82 }
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83 }
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84
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85 #ifdef ENABLE_DEBUG
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86 if (conf.debug_level > 0) {
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87 filename = g_strdup_printf("%s/debug.log", conf.log_dir);
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88 debugfile = fopen(filename, "a");
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89 if (!debugfile) {
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90 fprintf(stderr, "could not open debug log '%s'\n", filename);
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91 return FALSE;
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92 }
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93 g_free(filename);
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94 }
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95 #endif
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96 umask(saved_mode);
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97 return TRUE;
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98 }
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99
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100 void
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101 logclose()
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102 {
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103 if (conf.use_syslog)
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104 closelog();
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105 else if (logfile)
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106 fclose(logfile);
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107 if (debugfile)
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108 fclose(debugfile);
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109 }
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110
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111 void
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112 vlogwrite(int pri, const char *fmt, va_list args)
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113 {
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114 if ((conf.do_verbose && (pri & LOG_VERBOSE)) || (pri == LOG_ALERT) || (pri == LOG_WARNING)) {
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115 va_list args_copy;
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116 va_copy(args_copy, args);
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117 vfprintf(stdout, fmt, args_copy);
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118 va_end(args_copy);
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119 fflush(stdout); /* in case output ends not with newline */
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120 }
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121
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122 pri &= ~LOG_VERBOSE;
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123 if (!pri) {
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124 return;
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125 }
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126 if (conf.use_syslog)
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127 vsyslog(pri, fmt, args);
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128 else if (pri <= conf.log_max_pri) {
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129 FILE *file = logfile ? logfile : stderr;
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130 time_t now = time(NULL);
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131 struct tm *t = localtime(&now);
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132 gchar buf[24];
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133
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134 strftime(buf, 24, "%Y-%m-%d %H:%M:%S", t);
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135 fprintf(file, "%s [%d] ", buf, getpid());
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136
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137 vfprintf(file, fmt, args);
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138 fflush(file);
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139 }
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140 }
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141
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142 #ifdef ENABLE_DEBUG
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143 void
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144 vdebugwrite(int pri, const char *fmt, va_list args)
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145 {
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146 time_t now = time(NULL);
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147 struct tm *t = localtime(&now);
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148 gchar buf[24];
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149 strftime(buf, 24, "%Y-%m-%d %H:%M:%S", t);
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150
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151 if (debugfile) {
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152 fprintf(debugfile, "%s [%d] ", buf, getpid());
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153 vfprintf(debugfile, fmt, args);
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154 fflush(debugfile);
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155 } else {
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156 fprintf(stderr, "no debug file, msg was:\n");
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157 vfprintf(stderr, fmt, args);
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158 }
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159 }
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160 #endif
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161
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162 void
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163 logwrite(int pri, const char *fmt, ...)
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164 {
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165 va_list args, args_copy;
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166 int saved_errno = errno; /* somewhere this is changed to EBADF */
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167
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168 va_start(args, fmt);
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169 #ifdef ENABLE_DEBUG
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170 va_copy(args_copy, args);
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171 #endif
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172 vlogwrite(pri, fmt, args);
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173 #ifdef ENABLE_DEBUG
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174 if (debugfile)
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175 vdebugwrite(pri, fmt, args_copy);
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176 va_end(args_copy);
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177 #endif
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178 va_end(args);
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179
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180 errno = saved_errno;
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181 }
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182
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183 #ifdef ENABLE_DEBUG
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184 void
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185 debugf(const char *fmt, ...)
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186 {
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187 va_list args;
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188 va_start(args, fmt);
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189
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190 vdebugwrite(LOG_DEBUG, fmt, args);
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191
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192 va_end(args);
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193 }
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194
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195 void
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196 vdebugf(const char *fmt, va_list args)
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197 {
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198 vdebugwrite(LOG_DEBUG, fmt, args);
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199 }
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200 #endif
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201
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202 void
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203 maillog(const char *fmt, ...)
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204 {
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205 va_list args;
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206 va_start(args, fmt);
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207
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208 vlogwrite(LOG_NOTICE, fmt, args);
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209
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210 va_end(args);
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211 }