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      1 /*-
      2  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Joerg Sonnenberger.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     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  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <poll.h>
     31 #include <stddef.h>
     32 #include <sys/tls.h>
     33 
     34 #ifdef __HAVE_NO___THREAD
     35 #define	__thread
     36 #endif
     37 
     38 extern int sleep_init;
     39 extern int sleep_fini;
     40 extern int dlopen_cookie;
     41 
     42 static void __attribute__((__constructor__))
     43 init1(void)
     44 {
     45 	dlopen_cookie = 1;
     46 	if (!sleep_init)
     47 		return;
     48 	for (;;)
     49 		poll(NULL, 0, -1);
     50 }
     51 
     52 extern int dlclose_cookie;
     53 
     54 static void __attribute__((__destructor__))
     55 fini1(void)
     56 {
     57 	dlclose_cookie = 1;
     58 	if (!sleep_fini)
     59 		return;
     60 	for (;;)
     61 		poll(NULL, 0, -1);
     62 }
     63 
     64 static __thread int tls_callback_var;
     65 
     66 static void __attribute__((__used__))
     67 tls_callback(void)
     68 {
     69 	tls_callback_var = 1;
     70 }
     71