FreeBSD/Linux Kernel Cross Reference
sys/contrib/libsodium/m4/ax_check_catchable_abrt.m4

     # SYNOPSIS
     #
     #   AX_CHECK_CATCHABLE_ABRT
     #
     # DESCRIPTION
     #
     #  Check whether SIGABRT can be caught using signal handlers.
     
     #serial 1
    
    AC_DEFUN([AX_CHECK_CATCHABLE_ABRT], [dnl
        AC_PREREQ(2.64)
        AS_VAR_PUSHDEF([CACHEVAR], [ax_cv_check_[]_AC_LANG_ABBREV[]CATCHABLE_ABRT])dnl
        AC_CACHE_CHECK([whether SIGABRT can be caught when using the _AC_LANG compiler], CACHEVAR, [
            AC_RUN_IFELSE([
                AC_LANG_PROGRAM([[
    #include <signal.h>
    #include <stdlib.h>
    
    #ifndef SIGABRT
    # error SIGABRT is not defined
    #endif
    
    static void sigabrt_handler_3(int _)
    {
        exit(0);
    }
    
    static void sigabrt_handler_2(int _)
    {
        signal(SIGABRT, sigabrt_handler_3);
        abort();
        exit(1);
    }
    
    static void sigabrt_handler_1(int _)
    {
        signal(SIGABRT, sigabrt_handler_2);
        abort();
        exit(1);
    }
                ]], [[
    signal(SIGABRT, sigabrt_handler_1);
    abort();
    exit(1);
                ]])],
                [AS_VAR_SET(CACHEVAR, [yes])],
                [AS_VAR_SET(CACHEVAR, [no])],
                [AS_VAR_SET(CACHEVAR, [unknown])]
            )
        ])
        AS_VAR_IF(CACHEVAR, yes,
            [AC_DEFINE([HAVE_CATCHABLE_ABRT], [1], [Define if SIGABRT can be caught using signal handlers])],
            [AC_MSG_WARN([On this platform, SIGABRT cannot be caught using signal handlers.])]
        )
        AS_VAR_POPDEF([CACHEVAR])dnl
    ])

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