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From: demoakt@iitmax.iit.edu (Avinash K Taparia)
Newsgroups: comp.windows.x
Subject: X and capturing stdout and stderr from a system(3S) call
Keywords: X motif
Message-ID: <1991Mar20.172535.18717@iitmax.iit.edu>
Date: 20 Mar 91 17:25:35 GMT
Organization: Illinois Institute of Technology / Academic Computing Center
Lines: 24


I am developing a graphical user interface using X, motif, and unix

I want to capture the information printed to stdout and stderr. the info
is printed by a system(3S) function call from one of the callbacks. the system
function call invokes an executable which prints to stdout and stderr.

I tried the XtAddInput() function. This is what i did

XtAddInput(fileno(stdin),XtInputReadMask,get_file_input,NULL);

I thought this would work assuming that the stdout of the system function that
i make from one of the call backs is the stdin for the graphical user interface.

I also tried the popen command and passed the fid to XtAddInput.

fid = popen(command,"r");
XtAddInput(fileno(fid),XtInputReadMask,.........

Any help with this please and also more information on the other masks with 
example would be appreciated. The other masks like XtInputExceptMask ......


thanks