lib/share.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  * $Id$
  22  ***************************************************************************/
  23
  24 #include "setup.h"
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <curl/curl.h>
  29 #include "urldata.h"
  30 #include "share.h"
  31 #include "curl_memory.h"
  32
  33 /* The last #include file should be: */
  34 #include "memdebug.h"
  35
  36 CURLSH *
  37 curl_share_init(void)
  38 {
  39   struct Curl_share *share = calloc(1, sizeof(struct Curl_share));
  40   if(share)
  41     share->specifier |= (1<<CURL_LOCK_DATA_SHARE);
  42
  43   return share;
  44 }
  45
  46 #undef curl_share_setopt
  47 CURLSHcode
  48 curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
  49 {
  50   struct Curl_share *share = (struct Curl_share *)sh;
  51   va_list param;
  52   int type;
  53   curl_lock_function lockfunc;
  54   curl_unlock_function unlockfunc;
  55   void *ptr;
  56
  57   if(share->dirty)
  58     /* don't allow setting options while one or more handles are already
  59        using this share */
  60     return CURLSHE_IN_USE;
  61
  62   va_start(param, option);
  63
  64   switch(option) {
  65   case CURLSHOPT_SHARE:
  66     /* this is a type this share will share */
  67     type = va_arg(param, int);
  68     share->specifier |= (1<<type);
  69     switch( type ) {
  70     case CURL_LOCK_DATA_DNS:
  71       if(!share->hostcache) {
  72         share->hostcache = Curl_mk_dnscache();
  73         if(!share->hostcache)
  74           return CURLSHE_NOMEM;
  75       }
  76       break;
  77
  78 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
  79     case CURL_LOCK_DATA_COOKIE:
  80       if(!share->cookies) {
  81         share->cookies = Curl_cookie_init(NULL, NULL, NULL, TRUE );
  82         if(!share->cookies)
  83           return CURLSHE_NOMEM;
  84       }
  85       break;
  86 #endif   /* CURL_DISABLE_HTTP */
  87
  88     case CURL_LOCK_DATA_SSL_SESSION: /* not supported (yet) */
  89     case CURL_LOCK_DATA_CONNECT:     /* not supported (yet) */
  90
  91     default:
  92       return CURLSHE_BAD_OPTION;
  93     }
  94     break;
  95
  96   case CURLSHOPT_UNSHARE:
  97     /* this is a type this share will no longer share */
  98     type = va_arg(param, int);
  99     share->specifier &= ~(1<<type);
 100     switch( type )
 101     {
 102       case CURL_LOCK_DATA_DNS:
 103         if(share->hostcache) {
 104           Curl_hash_destroy(share->hostcache);
 105           share->hostcache = NULL;
 106         }
 107         break;
 108
 109 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
 110       case CURL_LOCK_DATA_COOKIE:
 111         if(share->cookies) {
 112           Curl_cookie_cleanup(share->cookies);
 113           share->cookies = NULL;
 114         }
 115         break;
 116 #endif   /* CURL_DISABLE_HTTP */
 117
 118       case CURL_LOCK_DATA_SSL_SESSION:
 119         break;
 120
 121       case CURL_LOCK_DATA_CONNECT:
 122         break;
 123
 124       default:
 125         return CURLSHE_BAD_OPTION;
 126     }
 127     break;
 128
 129   case CURLSHOPT_LOCKFUNC:
 130     lockfunc = va_arg(param, curl_lock_function);
 131     share->lockfunc = lockfunc;
 132     break;
 133
 134   case CURLSHOPT_UNLOCKFUNC:
 135     unlockfunc = va_arg(param, curl_unlock_function);
 136     share->unlockfunc = unlockfunc;
 137     break;
 138
 139   case CURLSHOPT_USERDATA:
 140     ptr = va_arg(param, void *);
 141     share->clientdata = ptr;
 142     break;
 143
 144   default:
 145     return CURLSHE_BAD_OPTION;
 146   }
 147
 148   return CURLSHE_OK;
 149 }
 150
 151 CURLSHcode
 152 curl_share_cleanup(CURLSH *sh)
 153 {
 154   struct Curl_share *share = (struct Curl_share *)sh;
 155
 156   if(share == NULL)
 157     return CURLSHE_INVALID;
 158
 159   if(share->lockfunc)
 160     share->lockfunc(NULL, CURL_LOCK_DATA_SHARE, CURL_LOCK_ACCESS_SINGLE,
 161                     share->clientdata);
 162
 163   if(share->dirty) {
 164     if(share->unlockfunc)
 165       share->unlockfunc(NULL, CURL_LOCK_DATA_SHARE, share->clientdata);
 166     return CURLSHE_IN_USE;
 167   }
 168
 169   if(share->hostcache) {
 170     Curl_hash_destroy(share->hostcache);
 171     share->hostcache = NULL;
 172   }
 173
 174 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
 175   if(share->cookies)
 176     Curl_cookie_cleanup(share->cookies);
 177 #endif   /* CURL_DISABLE_HTTP */
 178
 179   if(share->unlockfunc)
 180     share->unlockfunc(NULL, CURL_LOCK_DATA_SHARE, share->clientdata);
 181   free(share);
 182
 183   return CURLSHE_OK;
 184 }
 185
 186
 187 CURLSHcode
 188 Curl_share_lock(struct SessionHandle *data, curl_lock_data type,
 189                 curl_lock_access accesstype)
 190 {
 191   struct Curl_share *share = data->share;
 192
 193   if(share == NULL)
 194     return CURLSHE_INVALID;
 195
 196   if(share->specifier & (1<<type)) {
 197     if(share->lockfunc) /* only call this if set! */
 198       share->lockfunc(data, type, accesstype, share->clientdata);
 199   }
 200   /* else if we don't share this, pretend successful lock */
 201
 202   return CURLSHE_OK;
 203 }
 204
 205 CURLSHcode
 206 Curl_share_unlock(struct SessionHandle *data, curl_lock_data type)
 207 {
 208   struct Curl_share *share = data->share;
 209
 210   if(share == NULL)
 211     return CURLSHE_INVALID;
 212
 213   if(share->specifier & (1<<type)) {
 214     if(share->unlockfunc) /* only call this if set! */
 215       share->unlockfunc (data, type, share->clientdata);
 216   }
 217
 218   return CURLSHE_OK;
 219 }