TTYNAME

Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
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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.

COLOPHON

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