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From: jfh@killer.UUCP
Newsgroups: comp.unix.questions
Subject: Re: Shell doesn't pass modified signal mask to sub-processes
Message-ID: <763@killer.UUCP>
Date: Thu, 9-Apr-87 16:56:12 EST
Article-I.D.: killer.763
Posted: Thu Apr  9 16:56:12 1987
Date-Received: Sun, 12-Apr-87 01:27:08 EST
References: <319@baskin.UUCP>
Organization: The Unix(tm) Connection, Dallas, Texas
Lines: 53
Keywords: No need to read article - Summary gives it all ...
Summary: Try writing your own system(3) call.

I ran into this once.  In K&R or the old Green Unix book someone gives the
code to system(3).  Scarf this code and modify it to handle the signals the
way you want.

Or, chew on this ...

--------------- cut here at your own risk ----------------

#include <signal.h>

system (s)
char	*s;
{
	int	child;
	int	status;
	int	i;
	int	(*ifunc) ());
	int	(*qfunc) ());

	child = fork ();
	
	if (child < 0)
		return (-1);

	if (child > 0) {
		ifunc = signal (SIG_INT, SIG_IGN);
		qfunc = signal (SIG_QUIT, SIG_IGN);

		while (wait (&status) != child)
			;

		signal (SIG_INT, ifunc);
		signal (SIG_QUIT, qfunc);

		return (status);
	} else {
		signal (SIG_INT, SIG_DFL);
		signal (SIG_QUIT, SIG_DFL);

		execle ("/bin/sh", "-c", s, (char *) 0);
		exit (0377);
	}
}
-------------------------- slash -----------------------

Okay?


- John.

Disclaimer:
	You are responsible for your own actions.
		Including believing that this code works ...