lib/gssapi/krb5/init.c

   1 /*
   2  * Copyright (c) 1997 - 2001, 2003, 2006 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5/gsskrb5_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 static HEIMDAL_MUTEX context_mutex = HEIMDAL_MUTEX_INITIALIZER;
  39 static int created_key;
  40 static HEIMDAL_thread_key context_key;
  41
  42 static void
  43 destroy_context(void *ptr)
  44 {
  45     krb5_context context = ptr;
  46
  47     if (context == NULL)
  48         return;
  49     krb5_free_context(context);
  50 }
  51
  52 krb5_error_code
  53 _gsskrb5_init (krb5_context *context)
  54 {
  55     krb5_error_code ret = 0;
  56
  57     HEIMDAL_MUTEX_lock(&context_mutex);
  58
  59     if (!created_key) {
  60         HEIMDAL_key_create(&context_key, destroy_context, ret);
  61         if (ret) {
  62             HEIMDAL_MUTEX_unlock(&context_mutex);
  63             return ret;
  64         }
  65         created_key = 1;
  66     }
  67     HEIMDAL_MUTEX_unlock(&context_mutex);
  68
  69     *context = HEIMDAL_getspecific(context_key);
  70     if (*context == NULL) {
  71
  72         ret = krb5_init_context(context);
  73         if (ret == 0) {
  74             HEIMDAL_setspecific(context_key, *context, ret);
  75             if (ret) {
  76                 krb5_free_context(*context);
  77                 *context = NULL;
  78             }
  79         }
  80     }
  81
  82     return ret;
  83 }