Mercurial > noffle
annotate src/request.c @ 435:aae1f2906cea noffle
[svn] updated init script output
author | godisch |
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date | Tue, 24 Jun 2003 10:28:18 +0100 |
parents | 5eece4dfd945 |
children | 6f99218719e4 |
rev | line source |
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1 /* |
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2 request.c |
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3 |
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4 Collection of articles that are marked for download. |
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5 |
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6 $Id: request.c 413 2002-12-27 21:48:25Z bears $ |
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7 */ |
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8 |
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9 #if HAVE_CONFIG_H |
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10 #include <config.h> |
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11 #endif |
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12 |
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13 #include <stdio.h> |
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14 #include <dirent.h> |
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15 #include <errno.h> |
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16 #include <fcntl.h> |
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17 #include <sys/types.h> |
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18 #include <sys/stat.h> |
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19 #include <unistd.h> |
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20 #include <assert.h> |
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21 #include "configfile.h" |
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22 #include "log.h" |
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23 #include "portable.h" |
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24 #include "request.h" |
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25 #include "util.h" |
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26 |
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27 |
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28 /* This struct keeps record of the message IDs that are to be fetched from |
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29 one particular host. Several of these are chained together via the |
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30 "next" pointer, if we have several servers. |
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31 */ |
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32 |
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33 struct Reqserv; |
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34 typedef struct Reqserv Reqserv; |
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35 |
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36 struct Reqserv { |
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37 char* serv; /* Server the messages are to be requested |
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38 from */ |
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39 char** reql; /* List of message IDs of requested |
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40 messages. Some entries (that have been |
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41 deleted) may be NULL */ |
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42 int reql_length; /* Number of string pointers in reql, |
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43 including NULL entries */ |
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44 int reql_capacity; /* maximum number of string pointers reql |
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45 can hold */ |
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46 Bool dirty; /* whether the request list needs to be |
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47 rewritten to disk */ |
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48 Reqserv* next; /* next Reqserv in list */ |
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49 time_t mtime; /* last modification time of request file */ |
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50 }; |
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51 |
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52 /* List of servers */ |
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53 static Reqserv* reqserv = 0; |
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54 |
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55 /* sanity check */ |
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56 static Bool is_open = FALSE; |
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57 |
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58 /* for Req_first/Req_next */ |
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59 static char** iterator = 0; |
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60 static char** iterator_end = 0; |
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61 |
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62 |
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63 /* local functions */ |
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64 static Reqserv* newReqserv ( const char* serv ); |
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65 static Bool getReqserv ( const char* serv, Reqserv** rsz ); |
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66 static void fileRequest ( Str file, const char *serv ); |
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67 static char** searchMsgId ( const Reqserv * rs, const char *msgId ); |
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68 static Bool storeMsgId ( Reqserv* rs, const char* msgId ); |
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69 static Bool readRequestfile ( const char* serv, Reqserv** rsz ); |
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70 static time_t get_mtime ( const char* serv ); |
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71 |
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72 /* read modification time of request file */ |
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73 static time_t |
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74 get_mtime( const char* serv ) |
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75 { |
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76 Str filename; |
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77 struct stat stat1; |
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78 |
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79 fileRequest( filename, serv ); |
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80 stat( filename, &stat1 ); |
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81 return stat1.st_mtime; |
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82 } |
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83 |
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84 |
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85 /* create new Reqserv and queue it */ |
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86 static Reqserv* |
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87 newReqserv( const char* serv ) |
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88 { |
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89 Reqserv *rs; |
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90 |
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91 rs = malloc( sizeof( Reqserv ) ); |
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92 if ( rs == NULL ) |
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93 Log_fatal( "Malloc of Reqserv failed." ); |
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94 |
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95 Utl_allocAndCpy( &(rs->serv), serv ); |
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96 rs->reql = 0; |
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97 rs->reql_length = 0; |
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98 rs->reql_capacity = 0; |
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99 rs->next = reqserv; |
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100 rs->dirty = FALSE; |
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101 rs->mtime = 0; |
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102 reqserv = rs; |
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103 return rs; |
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104 } |
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105 |
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106 |
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107 /* get Reqserv for given server, and save it in "rsz". Load from file as |
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108 necessary. Return TRUE on success. Otherwise log errors and return |
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109 FALSE. (details in errno) |
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110 */ |
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111 static Bool |
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112 getReqserv( const char* serv, Reqserv** rsz ) |
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113 { |
281
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114 Reqserv* rs; |
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115 |
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116 for ( rs = reqserv; rs; rs = rs->next ) |
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117 if ( !strcmp( serv, rs->serv ) ) |
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118 { |
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119 *rsz = rs; |
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120 return TRUE; |
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121 } |
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122 return readRequestfile( serv, rsz ); |
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123 } |
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124 |
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125 |
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126 /* Delete Reqserv from cache, if not up-to-date */ |
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127 static void |
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128 cleanupReqserv( void ) |
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129 { |
281
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130 Reqserv *rs, *prev, *next; |
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131 |
281
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132 rs = reqserv; |
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133 prev = NULL; |
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134 while ( rs != NULL ) |
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135 { |
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136 ASSERT( ! rs->dirty ); |
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137 next = rs->next; |
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138 if ( get_mtime( rs->serv ) != rs->mtime ) |
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139 { |
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140 if ( prev != NULL ) |
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141 prev->next = next; |
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142 else |
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143 reqserv = next; |
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144 free( rs->serv ); |
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145 rs->serv = NULL; |
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146 free( rs->reql ); |
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147 rs->reql = NULL; |
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148 free( rs ); |
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149 } |
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150 prev = rs; |
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151 rs = next; |
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152 } |
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153 } |
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154 |
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155 /* Save name of file storing requests from server "serv" in "file" */ |
281
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156 static void |
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157 fileRequest( Str file, const char *serv ) |
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158 { |
281
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159 snprintf( file, MAXCHAR, "%s/requested/%s", Cfg_spoolDir(), serv); |
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160 } |
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161 |
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162 |
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163 /* Search for msgid in Reqserv. Return pointer to list entry. Return 0 if |
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164 list does not contain msgid. */ |
281
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165 static char** |
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166 searchMsgId( const Reqserv * rs, const char *msgId ) |
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167 { |
281
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168 char** rz; |
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169 ASSERT( rs != 0 ); |
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170 |
281
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171 if ( !rs->reql ) |
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172 return 0; |
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173 |
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174 for ( rz = rs->reql; rz < rs->reql + rs->reql_length; rz++ ) |
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175 if ( *rz && !strcmp( *rz, msgId ) ) |
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176 return rz; |
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177 |
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178 return 0; |
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179 } |
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180 |
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181 |
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182 Bool |
281
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183 Req_contains( const char *serv, const char *msgId ) |
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184 { |
281
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185 Reqserv *rs; |
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186 ASSERT( is_open ); |
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187 if (getReqserv( serv, &rs ) == FALSE) |
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188 return FALSE; |
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189 return ( searchMsgId( rs, msgId ) != NULL ); |
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190 } |
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191 |
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192 |
281
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193 static Bool |
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194 storeMsgId( Reqserv* rs, const char* msgId ) |
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195 { |
281
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196 char *msgid; |
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197 |
281
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198 if ( searchMsgId( rs, msgId ) ) |
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199 /* already recorded */ |
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200 return FALSE; |
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201 |
281
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202 Utl_allocAndCpy( &msgid, msgId ); |
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203 |
281
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204 if ( rs->reql_length >= rs->reql_capacity ) |
249 | 205 { |
281
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206 int c1 = rs->reql_capacity * 2 + 10; |
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207 rs->reql = ( char ** ) realloc( rs->reql, c1 * sizeof( char * ) ); |
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208 if ( rs->reql == NULL ) |
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209 Log_fatal( "Could not realloc requests." ); |
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210 rs->reql_capacity = c1; |
249 | 211 } |
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212 |
281
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213 *( rs->reql + rs->reql_length++ ) = msgid; |
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214 rs->dirty = TRUE; |
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215 return TRUE; |
124 | 216 } |
217 | |
218 static Bool | |
281
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219 appRequest( Reqserv* rs, const char *msgId ) |
124 | 220 { |
221 Str filename; | |
222 FILE* file; | |
223 | |
224 fileRequest(filename, rs->serv); | |
185
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225 Log_dbg( LOG_DBG_REQUESTS, "appending to request file %s", filename ); |
124 | 226 |
227 if (Log_check((file = fopen(filename, "a")) != 0, | |
281
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228 "could not open %s for appending: %s", |
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229 filename, strerror(errno))) |
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230 return FALSE; |
124 | 231 |
232 if (Log_check( fputs(msgId, file) != EOF | |
281
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233 && fputs("\n", file) != EOF, |
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234 "write error: %s", strerror(errno))) |
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235 return FALSE; |
124 | 236 |
237 if (Log_check(fclose(file) != EOF, | |
281
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238 "could not close %s properly: %s\n", |
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239 filename, strerror(errno))) |
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240 return FALSE; |
124 | 241 |
242 return TRUE; | |
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243 } |
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244 |
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245 |
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246 /* Add request for message "msgIg" from server "serv". Return TRUE iff |
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247 successful. |
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248 */ |
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249 Bool |
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250 Req_add( const char *serv, const char *msgId ) |
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251 { |
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252 Reqserv* rs; |
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253 ASSERT( is_open ); |
185
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254 Log_dbg( LOG_DBG_REQUESTS, "Marking %s on %s for download", msgId, serv ); |
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255 |
281
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256 if ( ! getReqserv( serv, &rs ) ) |
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257 return FALSE; |
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258 if ( ! storeMsgId(rs, msgId) ) /* already recorded */ |
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259 return TRUE; |
124 | 260 return appRequest(rs, msgId); |
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261 } |
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262 |
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263 static Bool |
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264 readLn( Str line, FILE* f ) |
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265 { |
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266 size_t len; |
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267 |
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268 if ( ! fgets( line, MAXCHAR, f ) ) |
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269 return FALSE; |
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270 len = strlen( line ); |
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271 if ( line[ len - 1 ] == '\n' ) |
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272 line[ len - 1 ] = '\0'; |
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273 return TRUE; |
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274 } |
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275 |
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276 /* Read request file into new, non-queued Reqserv. Save new Reqserv in |
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277 "rsz" and return TRUE on success. Returns FALSE on failure, see errno. |
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278 If the file doesn't exist, an empty Reqserv is returned. |
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279 */ |
281
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280 static Bool |
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281 readRequestfile( const char* serv, Reqserv** rsz ) |
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282 { |
281
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283 Str filename; |
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284 Str line; |
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285 FILE* file; |
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286 Reqserv* rs; |
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287 |
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288 fileRequest( filename, serv ); |
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289 Log_dbg( LOG_DBG_REQUESTS, "reading request file %s", filename ); |
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290 |
281
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291 file = fopen( filename, "r" ); |
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292 if ( !file && ( errno == ENOENT ) ) |
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293 { |
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294 *rsz = newReqserv( serv ); |
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295 (*rsz)->mtime = get_mtime( serv ); |
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296 return TRUE; |
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297 } |
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298 if ( Log_check( file != 0, |
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299 "could not open %s for reading: %s", |
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300 filename, strerror( errno ) ) ) |
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301 return FALSE; |
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302 |
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303 rs = *rsz = newReqserv( serv ); |
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304 |
281
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305 while( readLn( line, file ) ) |
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306 { |
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307 char *line1 = Utl_stripWhiteSpace( line ); |
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308 if ( *line1 ) |
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309 storeMsgId( rs, line1 ); |
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310 } |
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311 |
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312 rs->dirty = FALSE; |
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313 |
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314 if ( Log_check( fclose( file ) != EOF, |
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315 "could not close %s properly: %s\n", |
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316 filename, strerror( errno ) ) ) |
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317 return FALSE; |
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318 |
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319 return TRUE; |
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320 } |
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321 |
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322 |
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323 /* Write out request file for given Reqserv. Return TRUE on success. If an |
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324 I/O error occurs, it is logged, and FALSE is returned. |
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325 */ |
281
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326 static Bool |
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327 writeRequestfile( Reqserv* rs ) |
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328 { |
281
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329 Str filename; |
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330 FILE* file; |
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331 char** z; |
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332 |
281
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333 fileRequest( filename, rs->serv ); |
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334 Log_dbg( LOG_DBG_REQUESTS, "writing request file %s", filename ); |
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335 |
281
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336 if ( Log_check( ( file = fopen( filename, "w" ) ) != 0, |
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337 "could not open %s for writing: %s", |
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338 filename, strerror( errno ) ) ) |
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339 return FALSE; |
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340 |
281
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341 if ( rs->reql ) |
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342 for ( z = rs->reql; z < rs->reql+rs->reql_length; z++ ) |
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343 if ( *z ) |
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344 { |
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345 if ( Log_check( fputs( *z, file ) != EOF |
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346 && fputs( "\n", file ) != EOF, |
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347 "write error: %s", strerror( errno ) ) ) |
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348 return FALSE; |
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349 } |
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350 |
281
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351 if ( Log_check( fclose( file ) != EOF, |
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352 "could not close %s properly: %s\n", |
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353 filename, strerror( errno ) ) ) |
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354 return FALSE; |
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355 |
281
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356 rs->dirty = FALSE; |
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357 rs->mtime = get_mtime( rs->serv ); |
43
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358 |
281
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359 return TRUE; |
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360 } |
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361 |
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362 |
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363 void |
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364 Req_remove( const char *serv, const char *msgId ) |
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365 { |
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366 Reqserv* rs; |
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367 char** z; |
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368 |
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369 ASSERT( is_open ); |
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370 Log_dbg( LOG_DBG_REQUESTS, "Req_remove(\"%s\", \"%s\")", serv, msgId ); |
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371 |
281
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372 if ( !getReqserv(serv, &rs) ) |
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373 return; |
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374 |
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375 z = searchMsgId( rs, msgId ); |
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376 if ( ! z ) |
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377 return; |
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378 |
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379 free( *z ); |
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380 *z = 0; |
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381 rs->dirty = TRUE; |
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382 } |
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383 |
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384 |
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385 Bool |
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386 Req_first( const char *serv, Str msgId ) |
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387 { |
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388 Reqserv* rs; |
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389 |
281
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390 ASSERT( is_open ); |
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391 ASSERT( !iterator && !iterator_end ); |
43
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392 |
281
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393 if ( !getReqserv( serv, &rs ) ) |
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394 return FALSE; |
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395 |
281
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396 if ( !rs->reql ) |
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397 return FALSE; |
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398 |
281
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399 iterator = rs->reql - 1; |
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400 iterator_end = rs->reql + rs->reql_length; |
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401 |
281
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402 return Req_next( msgId ); |
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403 } |
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404 |
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405 |
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406 Bool |
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407 Req_next( Str msgId ) |
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408 { |
281
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409 ASSERT( is_open ); |
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410 ASSERT( iterator && iterator_end ); |
43
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411 |
281
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412 if ( iterator >= iterator_end ) |
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413 return FALSE; |
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414 iterator++; |
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415 |
281
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416 while ( iterator < iterator_end ) |
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417 { |
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418 if ( !*iterator ) |
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419 iterator++; |
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420 else |
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421 { |
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422 Utl_cpyStr( msgId, *iterator ); |
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423 return TRUE; |
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424 } |
43
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425 } |
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426 |
281
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427 iterator = iterator_end = 0; |
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428 return FALSE; |
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429 } |
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430 |
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431 |
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432 /* Get exclusive access to all request files. Maybe we already have had it, |
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433 and the cache is outdated. So we delete request files, which have |
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434 changed recently, from cache. These files will be reread on demand. |
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435 */ |
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436 Bool |
281
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437 Req_open( void ) |
43
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438 { |
281
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439 Log_dbg( LOG_DBG_REQUESTS, "opening request database" ); |
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440 ASSERT( !is_open ); |
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441 |
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442 cleanupReqserv(); |
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443 is_open = TRUE; |
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444 return TRUE; |
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445 } |
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446 |
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447 |
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448 /* Do not occupy the request files any longer. Write any changes to disk. |
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449 Return TRUE on success, FALSE if an IO error occurs. */ |
281
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450 void |
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451 Req_close(void) |
43
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452 { |
281
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453 Bool ret = TRUE; |
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454 Reqserv* rs; |
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455 Log_dbg( LOG_DBG_REQUESTS, |
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456 "closing request database, writing changes to disk" ); |
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457 ASSERT( is_open ); |
43
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458 |
281
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459 for ( rs = reqserv; rs; rs = rs->next ) |
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460 { |
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461 if ( rs->dirty ) |
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462 { |
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463 if ( !writeRequestfile( rs ) ) |
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464 ret = FALSE; |
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465 } |
43
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466 } |
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467 |
281
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468 is_open = FALSE; |
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469 } |