libmicrohttpd

HTTP/1.x server C library (MHD 1.x, stable)
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mhd_panic.h (2479B)

      1 /*
      2   This file is part of libmicrohttpd
      3   Copyright (C) 2007-2018 Daniel Pittman and Christian Grothoff
      4   Copyright (C) 2014-2022 Evgeny Grin (Karlson2k)
      5 
      6   This library is free software; you can redistribute it and/or
      7   modify it under the terms of the GNU Lesser General Public
      8   License as published by the Free Software Foundation; either
      9   version 2.1 of the License, or (at your option) any later version.
     10 
     11   This library is distributed in the hope that it will be useful,
     12   but WITHOUT ANY WARRANTY; without even the implied warranty of
     13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14   Lesser General Public License for more details.
     15 
     16   You should have received a copy of the GNU Lesser General Public
     17   License along with this library; if not, write to the Free Software
     18   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     19 */
     20 
     21 /**
     22  * @file microhttpd/mhd_panic.h
     23  * @brief  Declaration and macros for MHD_panic()
     24  * @author Daniel Pittman
     25  * @author Christian Grothoff
     26  * @author Karlson2k (Evgeny Grin)
     27  */
     28 
     29 #ifndef MHD_PANIC_H
     30 #define MHD_PANIC_H 1
     31 
     32 #include "mhd_options.h"
     33 
     34 #ifdef MHD_PANIC
     35 /* Override any possible defined MHD_PANIC macro with proper one */
     36 #undef MHD_PANIC
     37 #endif /* MHD_PANIC */
     38 
     39 /* If we have Clang or gcc >= 4.5, use __builtin_unreachable() */
     40 #if defined(__clang__) || (defined(__GNUC__) && __GNUC__ > 4) || \
     41   (defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ >= 5)
     42 #define BUILTIN_NOT_REACHED __builtin_unreachable ()
     43 #elif defined(_MSC_FULL_VER)
     44 #define BUILTIN_NOT_REACHED __assume (0)
     45 #else
     46 #define BUILTIN_NOT_REACHED
     47 #endif
     48 
     49 /* The MHD_PanicCallback type, but without main header. */
     50 /**
     51  * Handler for fatal errors.
     52  */
     53 extern void
     54 (*mhd_panic) (void *cls,
     55               const char *file,
     56               unsigned int line,
     57               const char *reason);
     58 
     59 /**
     60  * Closure argument for "mhd_panic".
     61  */
     62 extern void *mhd_panic_cls;
     63 
     64 #ifdef HAVE_MESSAGES
     65 /**
     66  * Trigger 'panic' action based on fatal errors.
     67  *
     68  * @param msg error message (const char *)
     69  */
     70 #define MHD_PANIC(msg) do { mhd_panic (mhd_panic_cls, __FILE__, __LINE__, msg); \
     71                             BUILTIN_NOT_REACHED; } while (0)
     72 #else
     73 /**
     74  * Trigger 'panic' action based on fatal errors.
     75  *
     76  * @param msg error message (const char *)
     77  */
     78 #define MHD_PANIC(msg) do { mhd_panic (mhd_panic_cls, NULL, __LINE__, NULL); \
     79                             BUILTIN_NOT_REACHED; } while (0)
     80 #endif
     81 
     82 #endif /* MHD_PANIC_H */