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