1 /*
   2  * Copyright (c) 2017 Juniper Networks.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  */
  25 
  26 /*
  27  * Copyright 2018 Nexenta Systems, Inc.
  28  */
  29 
  30 #include "lint.h"
  31 
  32 #include <sys/types.h>
  33 #include <errno.h>
  34 #include <stddef.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <synch.h>
  38 #include <thread.h>
  39 #include <unistd.h>
  40 
  41 #include "libc.h"
  42 
  43 /*
  44  * Rationale recommends allocating new memory each time.
  45  */
  46 static constraint_handler_t *_ch = NULL;
  47 static mutex_t ch_lock = ERRORCHECKMUTEX;
  48 
  49 constraint_handler_t
  50 set_constraint_handler_s(constraint_handler_t handler)
  51 {
  52         constraint_handler_t *new, *old, ret;
  53 
  54         new = malloc(sizeof (constraint_handler_t));
  55         if (new == NULL)
  56                 return (NULL);
  57         *new = handler;
  58         mutex_enter(&ch_lock);
  59         old = _ch;
  60         _ch = new;
  61         mutex_exit(&ch_lock);
  62         if (old == NULL) {
  63                 ret = NULL;
  64         } else {
  65                 ret = *old;
  66                 free(old);
  67         }
  68         return (ret);
  69 }
  70 
  71 /*ARGSUSED*/
  72 void
  73 abort_handler_s(const char *_RESTRICT_KYWD msg,
  74     void *_RESTRICT_KYWD ptr, errno_t error)
  75 {
  76         common_panic("abort_handler_s: ", msg);
  77 }
  78 
  79 /*ARGSUSED*/
  80 void
  81 ignore_handler_s(const char *_RESTRICT_KYWD msg,
  82     void *_RESTRICT_KYWD ptr, errno_t error)
  83 {
  84 }
  85 
  86 void
  87 __throw_constraint_handler_s(const char *_RESTRICT_KYWD msg, errno_t error)
  88 {
  89         constraint_handler_t ch;
  90 
  91         mutex_enter(&ch_lock);
  92         ch = (_ch != NULL) ? *_ch : NULL;
  93         mutex_exit(&ch_lock);
  94         if (ch != NULL) {
  95                 ch(msg, NULL, error);
  96         } else {
  97                 /*
  98                  * If current handler is NULL (there were no calls to
  99                  * set_constraint_handler_s(), or it was called with NULL
 100                  * pointer handler argument), call default constraint handler
 101                  * per K.3.6.1.1 points 4 and 5.
 102                  *
 103                  * This implementation defines abort_handler_s() as default.
 104                  */
 105                 abort_handler_s(msg, NULL, error);
 106         }
 107 }