Date: Sat, 21 Jul 2001 18:58:31 +0200 From: Gabriel Ambuehl <gabriel_ambuehl@buz.ch> To: freebsd-questions@freebsd.org Subject: WEXITSTATUS yields strange results Message-ID: <64104717866.20010721185831@buz.ch>
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Hello,
I'm trying to get the argument a child (created with vfork() + exec()
so not a copy of the parent), supplied to it's exit (or
return, for that matter) statement.
pid_t pstat;
do
{
pid = waitpid(dual_pipe->pid, &pstat, 0);
} while (pid == -1 && errno == EINTR);
/* Remove the entry from the linked list. */
if (last == NULL)
{
pidlist = dual_pipe->next;
}
delete(dual_pipe);
return (pstat);
Now the first thing that confuses me is that WIFEXITED(pstat)
sometimes returns
true, whereas other times I get WIFSIGNALED(pstat)=true which doesn't
make much sense to me as the child I use for testing is so dumb
simple
that it is almost impossible that it does something illegal (I'm
running it in a self written bidirectional popen() and I always get
to
see all the data I should). In any case, it for sure doesn't dump
core
as there's no core file.
In both cases, WEXISTATUS(pstat) yields a 6 digit integer (in the
case
of WIFSIGNALED, the signal is either 96 or 120 which both mean
nothing
to me) that isn't of any use to me as I'd like to gather the argument
to
exit of the child in order to decide whether it did it's job and
nothing else.
What am I doing wrong?
If I do a simple fork() + exec() sequence without pipe magic, I
always get to see WIFEXITED=true and the correct status...
Best regards,
Gabriel
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