libc-bottom-half/libpreopen/lib/po_err.c

   1 /*-
   2  * Copyright (c) 2016 Stanley Uche Godfrey
   3  * Copyright (c) 2018 Jonathan Anderson
   4  * All rights reserved.
   5  *
   6  * This software was developed at Memorial University under the
   7  * NSERC Discovery program (RGPIN-2015-06048).
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /**
  33  * @file  po_err.c
  34  * @brief Error handling for libpreopen
  35  */
  36
  37 #ifdef __wasilibc_unmodified_upstream
  38 #include <sys/cdefs.h>
  39 #include <sys/param.h>
  40 #include <sys/mman.h>
  41 #endif
  42 #include <sys/stat.h>
  43 #include <sys/types.h>
  44 #ifdef __wasilibc_unmodified_upstream
  45 #include <sys/wait.h>
  46 #endif
  47
  48 #include <assert.h>
  49 #include <errno.h>
  50 #include <fcntl.h>
  51 #include <limits.h>
  52 #include <stdarg.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <unistd.h>
  57
  58 #include "internal.h"
  59 #include "libpreopen.h"
  60
  61 #ifdef __wasilibc_unmodified_upstream
  62 /* Disable all this error reporting code. */
  63 static char error_buffer[1024];
  64 #endif
  65
  66 #if !defined(NDEBUG)
  67 #ifdef __wasilibc_unmodified_upstream
  68 #else
  69 static
  70 #endif
  71 void
  72 po_map_assertvalid(const struct po_map *map)
  73 {
  74         const struct po_map_entry *entry;
  75         size_t i;
  76
  77         assert(map->refcount > 0);
  78         assert(map->length <= map->capacity);
  79         assert(map->entries != NULL || map->capacity == 0);
  80
  81         for (i = 0; i < map->length; i++) {
  82                 entry = map->entries + i;
  83
  84                 assert(entry->name != NULL);
  85                 assert(entry->fd >= 0);
  86         }
  87 }
  88 #endif /* !defined(NDEBUG) */
  89
  90 #ifdef __wasilibc_unmodified_upstream
  91 void
  92 po_errormessage(const char *msg)
  93 {
  94
  95         snprintf(error_buffer, sizeof(error_buffer), "%s: error %d",
  96                 msg, errno);
  97 }
  98
  99 const char*
 100 po_last_error()
 101 {
 102
 103         return (error_buffer);
 104 }
 105 #endif