lib/libc/include/nss_tls.h

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2003 Networks Associates Technology, Inc.
   5  * All rights reserved.
   6  *
   7  * This software was developed for the FreeBSD Project by
   8  * Jacques A. Vidrine, Safeport Network Services, and Network
   9  * Associates Laboratories, the Security Research Division of Network
  10  * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
  11  * ("CBOSS"), as part of the DARPA CHATS research program.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD$
  35  *
  36  * Macros which generate thread local storage handling code in NSS modules.
  37  */
  38 #ifndef _NSS_TLS_H_
  39 #define _NSS_TLS_H_
  40
  41 #define NSS_TLS_HANDLING(name)                                  \
  42 static pthread_key_t name##_state_key;                          \
  43 static  void     name##_keyinit(void);                          \
  44 static  int      name##_getstate(struct name##_state **);       \
  45 \
  46 static void                                                             \
  47 name##_keyinit(void)                                                    \
  48 {                                                                       \
  49         (void)_pthread_key_create(&name##_state_key, name##_endstate);  \
  50 }                                                                       \
  51 \
  52 static int                                                      \
  53 name##_getstate(struct name##_state **p)                        \
  54 {                                                               \
  55         static struct name##_state st;                          \
  56         static pthread_once_t   keyinit = PTHREAD_ONCE_INIT;    \
  57         int                     rv;                             \
  58                                                                 \
  59         if (!__isthreaded || _pthread_main_np() != 0) {         \
  60                 *p = &st;                                       \
  61                 return (0);                                     \
  62         }                                                       \
  63         rv = _pthread_once(&keyinit, name##_keyinit);           \
  64         if (rv != 0)                                            \
  65                 return (rv);                                    \
  66         *p = _pthread_getspecific(name##_state_key);            \
  67         if (*p != NULL)                                         \
  68                 return (0);                                     \
  69         *p = calloc(1, sizeof(**p));                            \
  70         if (*p == NULL)                                         \
  71                 return (ENOMEM);                                \
  72         rv = _pthread_setspecific(name##_state_key, *p);        \
  73         if (rv != 0) {                                          \
  74                 free(*p);                                       \
  75                 *p = NULL;                                      \
  76         }                                                       \
  77         return (rv);                                            \
  78 }                                                               \
  79 /* allow the macro invocation to end with a semicolon */        \
  80 struct _clashproof_bmVjdGFy
  81
  82 #endif /* _NSS_TLS_H_ */