Path: utzoo!attcan!uunet!cs.utexas.edu!know!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!bloom-beacon!eru!luth!sunic!nuug!nososl!olav
From: olav@nososl.UUCP (Olav Eide)
Newsgroups: comp.lang.c
Subject: pclose hangs
Keywords: sigsetmask,pclose
Message-ID: <65@nososl.UUCP>
Date: 2 Aug 90 09:59:11 GMT
Reply-To: olav%nososl@nac.no (Jan-Olav Eide)
Organization: Nordic Offshore Systems A/S - Drilling Information Services
Lines: 27

I have a problems that I hope some of the experts out there can help me with.

I open a pipe, and read data from the file descriptor returned by the
popen call. The problem occurs when I attempt to close the pipe after
having finished reading. The program then hangs in the pclose call
and nothing happens until I kill the program.

Basically what I have is this :

            if (( fd = popen("process1 | process2","r")) == NULL)
	             exit(-1); /*  Broken pipe */

            while ( fgets(line,255,fd)) {
	               .
	              /* various stuff */
						     .
            }

           pclose(fd); /* And this is where it hangs */

It appears that it hangs in a call to sigsetmask.

Can anyone enlighten me ??

PS. We're running Integrated Solutions 4.3BSB

Thanks.