init.c revision 178826 
1/*
2 * Copyright (c) 1997 - 2001, 2003, 2006 Kungliga Tekniska H�gskolan
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
36RCSID("$Id: init.c 19031 2006-11-13 18:02:57Z lha $");
37
38static HEIMDAL_MUTEX context_mutex = HEIMDAL_MUTEX_INITIALIZER;
39static int created_key;
40static HEIMDAL_thread_key context_key;
41
42static void
43destroy_context(void *ptr)
44{
45    krb5_context context = ptr;
46
47    if (context == NULL)
48	return;
49    krb5_free_context(context);
50}
51
52krb5_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}
84