isatty(3) Library Functions Manual isatty(3) isatty - , Standard C library (libc, -lc) #include int isatty(int fd); isatty() , fd . isatty() 1, fd , ; 0, errno . EBADF fd . ENOTTY fd , . EINVAL ( POSIX, ENOTTY). attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |isatty() | | MT-Safe | +----------------------------+----------------------------------------------------------+--------------------------+ POSIX.1-2008. POSIX.1-2001, SVr4, 4.3BSD. fstat(2), ttyname(3) () Azamat Hackimov , Dmitriy S. Seregin , Yuri Kozlov , Kirill Rekhov ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () <>. Linux man-pages 6.12 23 2024 . isatty(3)