Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!ulticorp!rick
From: rick@ulticorp.UUCP (Rick Poleshuck)
Newsgroups: comp.unix.questions
Subject: Re: How do I tell if STDIN is a PIPE?
Message-ID: <494@ulticorp.UUCP>
Date: 6 Jun 91 12:38:32 GMT
References: <1991May26.172328.713@arizona.edu> <1991May30.101153.27842@thunder.mcrcim.mcgill.edu> <653@eskimo.celestial.com> <23190@shlump.lkg.dec.com>
Reply-To: rick@ulticorp.UUCP (Rick Poleshuck)
Distribution: world,local
Organization: The Ultimate Corp., East Hanover, NJ
Lines: 16

In article <23190@shlump.lkg.dec.com> lan_csse@netrix.nac.dec.com (CSSE LAN Test Account) writes:
>In article <653@eskimo.celestial.com> nanook@eskimo.celestial.com (Robert Dinse) writes:
>>In article <1991May30.101153.27842@thunder.mcrcim.mcgill.edu>, mouse@thunder.mcrcim.mcgill.edu (der Mouse) writes:
>>> In article <1991May26.172328.713@arizona.edu>, jjr@ace.ece.arizona.edu (Jeffrey J. Rodriguez) writes:
>>> 
>>> > How do I tell whether stdin is coming from a pipe?
>>> 

/* this looks real stupid but is quite portable */
if ( lseek( 0, 0l, 0 ) < 0 && errno == ESPIPE )
	puts( "stdin is from a pipe" );

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