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ttyname(3) -- Linux man page
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 NUL-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
Values stored in
errno
by a failing
ttyname()
or returned by a failing
ttyname_r():
- EBADF
-
Bad file descriptor.
- ENOTTY
-
File descriptor does not refer to a terminal device.
- ERANGE
-
buflen
was too small to allow storing the pathname.
CONFORMING TO
POSIX.1
SEE ALSO
fstat(2),
isatty(3)
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