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tag: cares-1_5_3
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/

#include "setup.h"
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include "urldata.h"
#include "share.h"
#include "memory.h"

/* The last #include file should be: */
#include "memdebug.h"

CURLSH *
curl_share_init(void)
{
  struct Curl_share *share =
    (struct Curl_share *)malloc(sizeof(struct Curl_share));
  if(share) {
    memset (share, 0, sizeof(struct Curl_share));
    share->specifier |= (1<<CURL_LOCK_DATA_SHARE);
  }

  return share;
}

#undef curl_share_setopt
CURLSHcode
curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
{
  struct Curl_share *share = (struct Curl_share *)sh;
  va_list param;
  int type;
  curl_lock_function lockfunc;
  curl_unlock_function unlockfunc;
  void *ptr;

  if(share->dirty)
    /* don't allow setting options while one or more handles are already
using this share */
    return CURLSHE_IN_USE;

  va_start(param, option);

  switch(option) {
  case CURLSHOPT_SHARE:
    /* this is a type this share will share */
    type = va_arg(param, int);
    share->specifier |= (1<<type);
    switch( type ) {
    case CURL_LOCK_DATA_DNS:
      if(!share->hostcache) {
        share->hostcache = Curl_mk_dnscache();
        if(!share->hostcache)
          return CURLSHE_NOMEM;
      }
      break;

#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
    case CURL_LOCK_DATA_COOKIE:
      if(!share->cookies) {
        share->cookies = Curl_cookie_init(NULL, NULL, NULL, TRUE );
        if(!share->cookies)
          return CURLSHE_NOMEM;
      }
      break;
#endif /* CURL_DISABLE_HTTP */

    case CURL_LOCK_DATA_SSL_SESSION: /* not supported (yet) */
    case CURL_LOCK_DATA_CONNECT: /* not supported (yet) */

    default:
      return CURLSHE_BAD_OPTION;
    }
    break;

  case CURLSHOPT_UNSHARE:
    /* this is a type this share will no longer share */
    type = va_arg(param, int);
    share->specifier &= ~(1<<type);
    switch( type )
    {
      case CURL_LOCK_DATA_DNS:
        if(share->hostcache) {
          Curl_hash_destroy(share->hostcache);
          share->hostcache = NULL;
        }
        break;

#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
      case CURL_LOCK_DATA_COOKIE:
        if(share->cookies) {
          Curl_cookie_cleanup(share->cookies);
          share->cookies = NULL;
        }
        break;
#endif /* CURL_DISABLE_HTTP */

      case CURL_LOCK_DATA_SSL_SESSION:
        break;

      case CURL_LOCK_DATA_CONNECT:
        break;

      default:
        return CURLSHE_BAD_OPTION;
    }
    break;

  case CURLSHOPT_LOCKFUNC:
    lockfunc = va_arg(param, curl_lock_function);
    share->lockfunc = lockfunc;
    break;

  case CURLSHOPT_UNLOCKFUNC:
    unlockfunc = va_arg(param, curl_unlock_function);
    share->unlockfunc = unlockfunc;
    break;

  case CURLSHOPT_USERDATA:
    ptr = va_arg(param, void *);
    share->clientdata = ptr;
    break;

  default:
    return CURLSHE_BAD_OPTION;
  }

  return CURLSHE_OK;
}

CURLSHcode
curl_share_cleanup(CURLSH *sh)
{
  struct Curl_share *share = (struct Curl_share *)sh;

  if(share == NULL)
    return CURLSHE_INVALID;

  if(share->lockfunc)
    share->lockfunc(NULL, CURL_LOCK_DATA_SHARE, CURL_LOCK_ACCESS_SINGLE,
                    share->clientdata);

  if(share->dirty) {
    if(share->unlockfunc)
      share->unlockfunc(NULL, CURL_LOCK_DATA_SHARE, share->clientdata);
    return CURLSHE_IN_USE;
  }

  if(share->hostcache)
    Curl_hash_destroy(share->hostcache);

#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_COOKIES)
  if(share->cookies)
    Curl_cookie_cleanup(share->cookies);
#endif /* CURL_DISABLE_HTTP */

  if(share->unlockfunc)
    share->unlockfunc(NULL, CURL_LOCK_DATA_SHARE, share->clientdata);
  free(share);

  return CURLSHE_OK;
}


CURLSHcode
Curl_share_lock(struct SessionHandle *data, curl_lock_data type,
                curl_lock_access accesstype)
{
  struct Curl_share *share = data->share;

  if(share == NULL)
    return CURLSHE_INVALID;

  if(share->specifier & (1<<type)) {
    if(share->lockfunc) /* only call this if set! */
      share->lockfunc(data, type, accesstype, share->clientdata);
  }
  /* else if we don't share this, pretend successful lock */

  return CURLSHE_OK;
}

CURLSHcode
Curl_share_unlock(struct SessionHandle *data, curl_lock_data type)
{
  struct Curl_share *share = data->share;

  if(share == NULL)
    return CURLSHE_INVALID;

  if(share->specifier & (1<<type)) {
    if(share->unlockfunc) /* only call this if set! */
      share->unlockfunc (data, type, share->clientdata);
  }

  return CURLSHE_OK;
}
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