Scroll to navigation

TTYNAME(3) Linux Programmer's Manual TTYNAME(3)

NAME

ttyname, ttyname_r - return name of a terminal

SYNOPSIS

#include <unistd.h>

char *ttyname(int fd);
int ttyname_r(int fd, char *buf, size_t buflen);

DESCRIPTION

The function ttyname() returns a pointer to the null-terminated pathname of the terminal device that is open on the file descriptor fd, or NULL on error (for example, if fd is not connected to a terminal). The return value may point to static data, possibly overwritten by the next call. The function ttyname_r() stores this pathname in the buffer buf of length buflen.

RETURN VALUE

The function ttyname() returns a pointer to a pathname on success. On error, NULL is returned, and errno is set appropriately. The function ttyname_r() returns 0 on success, and an error number upon error.

ERRORS

EBADF
Bad file descriptor.
ENOTTY
File descriptor does not refer to a terminal device.
ERANGE
(ttyname_r()) buflen was too small to allow storing the pathname.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
ttyname () Thread safety MT-Unsafe race:ttyname
ttyname_r () Thread safety MT-Safe

CONFORMING TO

POSIX.1-2001, POSIX.1-2008, 4.2BSD.

SEE ALSO

tty(1), fstat(2), ctermid(3), isatty(3)

COLOPHON

This page is part of release 4.10 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
2016-12-12 Linux