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Linux man pages : isatty (3)
ISATTY(3)		   Linux Programmer's Manual		     ISATTY(3)

NAME

isatty - does this descriptor refer to a terminal

SYNOPSIS

#include <unistd.h> int isatty(int desc);

DESCRIPTION

returns 1 if desc is an open descriptor connected to a terminal and 0 else.

CONFORMING TO

SVID, AT&T, X/OPEN, BSD 4.3

SEE ALSO

fstat(2), ttyname(3) Linux 1995-04-20 ISATTY(3)