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annotate libcore/core/panic.c @ 229:e71039d820a7

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doc: improve documentation
author David Demelier <markand@malikania.fr>
date Thu, 19 Nov 2020 16:46:26 +0100
parents aab824406d3d
children 76afe639fd72
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1 /*
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2 * panic.c -- unrecoverable error handling
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <stdio.h>
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21 #include <stdlib.h>
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22
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23 #include "error.h"
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24 #include "panic.h"
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25
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26 static void
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27 terminate(void)
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28 {
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29 fprintf(stderr, "abort: %s\n", error());
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30 abort();
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31 exit(1);
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32 }
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33
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34 void (*panic_handler)(void) = terminate;
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35
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36 void
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37 panicf(const char *fmt, ...)
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38 {
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39 assert(fmt);
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40
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41 va_list ap;
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42
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43 /*
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44 * Store the error before calling panic because va_end would not be
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45 * called.
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46 */
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47 va_start(ap, fmt);
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48 verrorf(fmt, ap);
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49 va_end(ap);
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50
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51 panic();
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52 }
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53
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54 void
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55 vpanicf(const char *fmt, va_list ap)
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56 {
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57 assert(fmt);
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58 assert(panic_handler);
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59
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60 verrorf(fmt, ap);
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61 panic();
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62 }
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63
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64 void
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65 panic(void)
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66 {
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67 assert(panic_handler);
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68
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69 panic_handler();
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71 /*
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72 * This should not happen, if it does it means the user did not fully
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73 * satisfied the constraint of panic_handler.
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74 */
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75 fprintf(stderr, "abort: panic handler returned");
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76 exit(1);
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77 }