TTYNAME(3) | Library Functions Manual | TTYNAME(3) |
ttyname
,
ttyname_r
, isatty
—
get name of associated terminal (tty) from file
descriptor
Standard C Library (libc, -lc)
#include
<unistd.h>
char *
ttyname
(int
fd);
int
ttyname_r
(int
fd, char *buf,
size_t len);
int
isatty
(int
fd);
These functions operate on file descriptors for terminal type devices.
The
isatty
()
function determines if the file descriptor fd refers
to a valid terminal type device.
The
ttyname
()
function gets the related device name of a file descriptor for which
isatty
() is true.
The
ttyname
()
function returns the name stored in a static buffer which will be
overwritten on subsequent calls. The
ttyname_r
()
function takes a buffer and length as arguments to avoid this problem.
The isatty
() function returns 1 if
fd refers to a terminal type device; otherwise, it
returns 0 and may set errno to indicate the error. The
ttyname
() function returns the null terminated name
if the device is found and isatty
() is true;
otherwise a NULL
pointer is returned. The
ttyname_r
() function returns 0 if successful.
Otherwise an error number is returned.
These functions may fail if:
EBADF
]ENOTTY
]Additionally, ttyname_r
() may fail if:
ERANGE
]The isatty
() and
ttyname
() functions appeared in
Version 7 AT&T UNIX. The
ttyname_r
() function appeared in
FreeBSD 6.0.
July 18, 2014 | macOS 14.6 |