ttyname(3) Library Functions Manual ttyname(3) ttyname, ttyname_r - LIBRARY Standard C library (libc, -lc) #include char *ttyname(int fd); int ttyname_r(int fd, char buf[.buflen], size_t buflen); ttyname() , fd, NULL (, fd ). , . ttyname_r() buf buflen. The function ttyname() returns a pointer to a pathname on success. On error, NULL is returned, and errno is set to indicate the error. The function ttyname_r() returns 0 on success, and an error number upon error. EBADF . ENODEV fd refers to a slave pseudoterminal device but the corresponding pathname could not be found (see NOTES). ENOTTY fd does not refer to a terminal device. ERANGE (ttyname_r()) buflen . attributes(7). +----------------------------+----------------------------------------------------------+--------------------------+ | | | | +----------------------------+----------------------------------------------------------+--------------------------+ |ttyname() | | MT-Unsafe race:ttyname | +----------------------------+----------------------------------------------------------+--------------------------+ |ttyname_r() | | MT-Safe | +----------------------------+----------------------------------------------------------+--------------------------+ POSIX.1-2008. POSIX.1-2001, 4.2BSD. , , pts(4), , /dev/ptmx, , . , . ttyname() ttyname_r() , NULL errno ENODEV. . tty(1), fstat(2), ctermid(3), isatty(3), pts(4) Azamat Hackimov , Dmitry Bolkhovskikh , Yuri Kozlov ; GNU 3 , . . , , . Linux man-pages 6.06 31 2023 . ttyname(3)