libjava/include/posix-signal.h

   1 // posix-signal.h - Catch runtime signals and turn them into exceptions.
   2
   3 /* Copyright (C) 1998, 1999, 2000, 2009, 2011  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #ifndef JAVA_SIGNAL_H
  12 #define JAVA_SIGNAL_H 1
  13
  14 #include <signal.h>
  15
  16 #define HANDLE_SEGV 1
  17 #define HANDLE_FPE 1
  18
  19 /* Different implementations of MD_FALLBACK_FRAME_STATE_FOR either require
  20    SA_SIGINFO being set or fail if so.  Cf. gcc/ada/init.c
  21    (__gnat_install_handler) for details.  */
  22
  23 #if (defined __alpha__ && defined __osf__) \
  24   || (defined __sun__ && defined __svr4__)
  25 #define SA_FLAGS SA_NODEFER | SA_SIGINFO
  26 #elif defined __sgi__
  27 #define SA_FLAGS SA_NODEFER
  28 #else
  29 #error Must define SA_FLAGS.
  30 #endif
  31
  32 #if SA_FLAGS & SA_SIGINFO
  33 #define SIGNAL_HANDLER(_name)                                           \
  34 static void _Jv_##_name (int,                                           \
  35                          siginfo_t *_si __attribute__ ((__unused__)),   \
  36                          void *_uc __attribute__ ((__unused__)))
  37 #define sa_signal_handler sa_sigaction
  38 #else
  39 #define SIGNAL_HANDLER(_name)                                           \
  40 static void _Jv_##_name (int)
  41 #define sa_signal_handler sa_handler
  42 #endif
  43
  44 #define MAKE_THROW_FRAME(_exception)
  45
  46 #define _INIT_SIG_HANDLER(_SIG, _ACTION)                                \
  47 do                                                                      \
  48   {                                                                     \
  49     struct sigaction act;                                               \
  50     act.sa_signal_handler = _Jv_##_ACTION;                              \
  51     act.sa_flags = SA_FLAGS;                                            \
  52     sigemptyset (&act.sa_mask);                                         \
  53     sigaction(_SIG, &act, NULL);                                        \
  54   }                                                                     \
  55 while (0)
  56
  57 #define INIT_SEGV       _INIT_SIG_HANDLER (SIGSEGV, catch_segv)
  58 #define INIT_FPE        _INIT_SIG_HANDLER (SIGFPE, catch_fpe)
  59
  60 #endif /* JAVA_SIGNAL_H */