Manual of ISATTY(3) (v2.66)

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 file descriptor connected to a terminal and 0 otherwise.

CONFORMING TO

SVr4, 4.3BSD, POSIX.1-2001.

SEE ALSO

fstat(2), ttyname(3)