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
 | Thread safety | MT-Unsafe race:ttyname
 | Thread safety | MT-Safe

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

SEE ALSO
fstat(2), ctermid(3), isatty(3)

COLOPHON
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