Re: Test for SA_RESTART?

[Harlan Stenn]

> Does anyone know of any reasonable way to test whether the SA_RESTART
> flag actually works (as opposed to simply being present in one of the
> standard header files)?

The following is what I wrote for metaconfig a While ago.

It's not all that you need, but it should be a start.

H
--
?S:d_keepsig:
?S:     This variable contains the eventual value of the SIGNALS_KEPT symbol,
?S:     which indicates to the C program if signal handlers need not reinstated
?S:     after receipt of a signal.
?S:.
?C:SIGNALS_KEPT (PERSISTENT_SIGNAL):
?C:     This symbol is defined if signal handlers needn't be reinstated after
?C:     receipt of a signal.
?C:.
?H:#$d_keepsig SIGNALS_KEPT     /**/
?H:.
?LINT:set d_keepsig
: see if signals are kept
val="$undef";
echo " "
echo "Checking to see if signal handlers stick around..." >&4
$cat >try.c <<'EOCP'
foo() {}

main()
{
        signal(2, foo);
        kill(getpid(), 2);
        kill(getpid(), 2);
        printf("abc\n");
}
EOCP
if $cc -o try $ccflags try.c >/dev/null 2>&1; then
?X: On AIX a single ./try will not work (with ksh)
        sh -c ./try > try.out 2>/dev/null
        if $contains abc try.out >/dev/null 2>&1; then
                echo "Yes, they do."
                val="$define";
        else
                echo "No, they don't."
        fi
else
        $echo $n "(I can't seem to compile the test program. Assuming $c"
        if bsd; then
                echo "they do.)"
                val="$define"
        else
                echo "they don't.)"
        fi
fi
set d_keepsig
eval $setvar
$rm -f try*