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¶
Multithreading (see pthreads(7))¶
The
ttyname() function is not thread-safe.
The
ttyname_r() function is thread-safe.
4.2BSD, POSIX.1-2001.
SEE ALSO¶
fstat(2),
ctermid(3),
isatty(3)
COLOPHON¶
This page is part of release 3.74 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
http://www.kernel.org/doc/man-pages/.
