How do I tell if STDIN is a PIPE?

[Rick Poleshuck]

In article <23190 at shlump.lkg.dec.com> lan_csse at netrix.nac.dec.com (CSSE LAN Test Account) writes:
>In article <653 at eskimo.celestial.com> nanook at eskimo.celestial.com (Robert Dinse) writes:
>>In article <1991May30.101153.27842 at thunder.mcrcim.mcgill.edu>, mouse at thunder.mcrcim.mcgill.edu (der Mouse) writes:
>>> In article <1991May26.172328.713 at arizona.edu>, jjr at 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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