Randall, Thanks for the response. No, I am not sure that Emacs uses pipes instead of ptys. I'll have to look at that. I was testing with the cygwin character emacs. What you said makes sense but I have one more question. I modified the code by inserting a call to fflush between the printf's. I would have thought this would force the first printf to display immediately but this did not happen. Can you help me understand why?
Thanks Steven Steven Kilby Lead, Programmer Analyst Vision Solutions, Inc. 17911 Von Karman Ave, 5th Floor Irvine, CA 92614 UNITED STATES Tel: +1 (949) 660-7479 Fax: +1 (949) 225-0287 Email: [EMAIL PROTECTED] <http://www.visionsolutions.com/> Disclaimer - 4/3/2003 The contents of this e-mail (and any attachments) are confidential, may be privileged, and may contain copyright material of Vision Solutions, Inc. or third parties. You may only reproduce or distribute the material if you are expressly authorized by Vision Solutions to do so. If you are not the intended recipient, any use, disclosure or copying of this e-mail (and any attachments) is unauthorized. If you have received this e-mail in error, please immediately delete it and any copies of it from your system and notify us via e-mail at [EMAIL PROTECTED] -----Original Message----- From: Randall R Schulz [mailto:[EMAIL PROTECTED] Sent: Thursday, April 03, 2003 4:41 PM To: [EMAIL PROTECTED] Subject: Re: Pipe behavior Steven, At 16:28 2003-04-03, you wrote: >Hello, > >I have a question about pipe behavior. I wrote a simple program that >does a printf, sleeps for 5 seconds and then another printf. If I run >the program with the following way: $ ./simple | cat The output is >delayed until the program finished. I guessed that the pipe is >buffered and doesn't flush until it is closed when the program ends. >But then I ran the same program as an emacs subprocess and attached a >buffer to it. In this scenario the first printf is displayed, 5 seconds >pass and then the second printf is displayed. Emacs also uses pipes so >I do not understand why the behavior is different. Pipes don't buffer in the manner you describe, but the standard I/O library does when its output is directed to a pipe or a plain file. Are you sure that Emacs uses pipes and not ptys (pseudo-ttys)? Which Emacs are you using? Cygwin or Windows? >Thanks >Steven Kilby Randall "We don't need no stinkin' disclaimers" Schulz -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/ -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
