Path: utzoo!attcan!uunet!cs.utexas.edu!uwm.edu!rpi!usenet
From: todd@narnia.ecs.rpi.edu (R. Lindsay Todd)
Newsgroups: comp.unix.questions
Subject: Using popen from a daemon
Message-ID: <YQJ$'7_@rpi.edu>
Date: 27 Jun 90 20:21:08 GMT
Distribution: na
Organization: ECS, Rensselaer Polytechnic Institute, Troy, NY
Lines: 13

I have a program that uses popen and pclose.  If the program has a controlling
tty, the commands started by popen work correctly.  However, if there is no
controlling tty, it seems like popen never even starts /bin/sh.  Oh yes, this
is true under both Ultrix 3.1 and SunOS 4.0.3, the only systems I've been
able to try this with.

There is nothing in the man pages I have that indicate that popen must have
a controlling tty.  Is this some unwritten standard "feature" of popen, or
is it a buggy implementation?
--
R. Lindsay Todd, Systems Programmer
ECS, Rensselaer Polytechnic Institute, Troy, NY 12180-3590
Internet: todd@narnia.ecs.rpi.edu