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# siginfo.m4 serial 1 (gettext-0.11)
dnl Copyright (C) 2001-2002, 2015-2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Determine how to determine the precise cause of a signal, for example
# division by zero.
# - SUSV2 and POSIX specify the use of sigaction with SA_SIGINFO and a member
# void (*)(int sig, siginfo_t *info, void *context) sa_sigaction.
# Linux (2.2.x and newer) and Solaris implement this.
# Linux (2.4.x and newer) on i386, m68k, sparc, sparc64, ia64 actually
# deliver FPE_INTDIV.
# - Without SA_SIGINFO:
# - Linux on m68k calls the handler as
# void (*)(int sig, int code, struct sigcontext* scp).
# For division by zero, code would be VEC_ZERODIV<<2.
# - Linux on sparc calls the handler either as
# void (*)(int sig, int code, struct sigcontext* scp),
# code for division by zero would be SUBSIG_IDIVZERO, or as
# void (*)(int sig, siginfo_t *info, void *context).
# Which one depends on a process specific flag in the kernel.
# - Linux on sparc64 always calls the handler as
# void (*)(int sig, siginfo_t *info, void *context).
# - FreeBSD on i386 calls the handler as
# void (*)(int sig, int code, void* scp, char* addr).
# For division by zero, code would be FPE_INTDIV.
# - SunOS 4 calls the handler as
# void (*)(int sig, int code, void* scp, char* addr).
# - Solaris?
# - Irix 5, OSF/1, AIX call the handler as
# void (*)(int sig, int code, struct sigcontext *scp).
# These are so many OS and CPU dependencies that we don't bother, and rely
# only on SA_SIGINFO.
AC_DEFUN([gt_SIGINFO],
[
AC_CACHE_CHECK([for signal handlers with siginfo_t], gt_cv_siginfo_t,
[AC_TRY_COMPILE([
#include <signal.h>], [
struct sigaction action;
siginfo_t info;
action.sa_flags = SA_SIGINFO;
action.sa_sigaction = (void *) 0;
], gt_cv_siginfo_t=yes, gt_cv_siginfo_t=no)])
if test $gt_cv_siginfo_t = yes; then
AC_DEFINE(HAVE_SIGINFO, 1,
[Define to 1 if <signal.h> defines the siginfo_t type,
and struct sigaction has the sa_sigaction member and the SA_SIGINFO flag.])
fi
])
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