summaryrefslogtreecommitdiffstats
path: root/libdimension/base/error.c
blob: 6b8d18eae9f37cf5eec8a20c1fcebce7eecbacc1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*************************************************************************
 * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com>     *
 *                                                                       *
 * This file is part of The Dimension Library.                           *
 *                                                                       *
 * The Dimension Library is free software; you can redistribute it and/  *
 * or modify it under the terms of the GNU Lesser General Public License *
 * as published by the Free Software Foundation; either version 3 of the *
 * License, or (at your option) any later version.                       *
 *                                                                       *
 * The Dimension Library is distributed in the hope that it will be      *
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
 * Lesser General Public License for more details.                       *
 *                                                                       *
 * You should have received a copy of the GNU Lesser General Public      *
 * License along with this program.  If not, see                         *
 * <http://www.gnu.org/licenses/>.                                       *
 *************************************************************************/

/**
 * @file
 * Error handling.
 */

#include "internal.h"
#include "internal/platform.h"
#include <errno.h>
#include <pthread.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/// Report internal errors in this file.
#define DMNSN_LOCAL_ERROR(str)                          \
  do {                                                  \
    fprintf(stderr, "Dimension ERROR: %s, %s:%u: %s\n", \
            DMNSN_FUNC, __FILE__, __LINE__, (str));     \
    abort();                                            \
  } while (0)

/// The default fatal error handler.
static void dmnsn_default_fatal_error_fn(void);

/// The current fatal error handler.
static atomic(dmnsn_fatal_error_fn *) dmnsn_fatal = ATOMIC_VAR_INIT(dmnsn_default_fatal_error_fn);

/// The current resilience.
static atomic_bool dmnsn_always_die = ATOMIC_VAR_INIT(false);

void
dmnsn_report_impl(bool die, const char *func, const char *file, unsigned int line, const char *str)
{
  // Save the value of errno
  int err = errno;

  bool always_die = atomic_load(&dmnsn_always_die);

  // Print the diagnostic string
  fprintf(stderr, "Dimension %s: %s, %s:%u: %s\n",
          die ? "ERROR" : "WARNING", func, file, line, str);

  // Print the value of errno
  if (err != 0) {
    fprintf(stderr, "Last error: %d", err);
#if DMNSN_STRERROR_R
    char errbuf[256];
    if (strerror_r(err, errbuf, 256) == 0) {
      fprintf(stderr, " (%s)", errbuf);
    }
#elif DMNSN_SYS_ERRLIST
    if (err >= 0 && err < sys_nerr) {
      fprintf(stderr, " (%s)", sys_errlist[err]);
    }
#endif
    fprintf(stderr, "\n");
  }

  // Print a stack trace to standard error
  dmnsn_backtrace(stderr);

  // Call the fatal error handler if needed
  if (die || always_die) {
    static __thread bool thread_exiting = false;

    if (thread_exiting) {
      if (die) {
        // Prevent infinite recursion if the fatal error function itself calls
        // dmnsn_error() (not dmnsn_warning())
        DMNSN_LOCAL_ERROR("Error raised while in error handler, aborting.");
      }
    } else {
      thread_exiting = true;

      dmnsn_fatal_error_fn *fatal = dmnsn_get_fatal_error_fn();
      fatal();
      DMNSN_LOCAL_ERROR("Fatal error handler didn't exit.");
    }
  }
}

void
dmnsn_report_warning(const char *func, const char *file, unsigned int line, const char *str)
{
  dmnsn_report_impl(false, func, file, line, str);
}

DMNSN_NORETURN
dmnsn_report_error(const char *func, const char *file, unsigned int line, const char *str)
{
  dmnsn_report_impl(true, func, file, line, str);
  DMNSN_UNREACHABLE();
}

void
dmnsn_die_on_warnings(bool always_die)
{
  atomic_store(&dmnsn_always_die, always_die);
}

dmnsn_fatal_error_fn *
dmnsn_get_fatal_error_fn(void)
{
  dmnsn_fatal_error_fn *fatal = atomic_load(&dmnsn_fatal);
  return fatal;
}

void
dmnsn_set_fatal_error_fn(dmnsn_fatal_error_fn *fatal)
{
  atomic_store(&dmnsn_fatal, fatal);
}

static void
dmnsn_default_fatal_error_fn(void)
{
  if (dmnsn_is_main_thread()) {
    exit(EXIT_FAILURE);
  } else {
    pthread_exit(NULL);
  }
}