isatty(3) -- Linux man page

 

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)