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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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TTYNAME(3) Linux Programmer's Manual TTYNAME(3)
ttyname, ttyname_r - return name of a terminal
#include <unistd.h>
char *ttyname(int fd);
int ttyname_r(int fd, char *buf, size_t buflen);
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.
The function ttyname() returns a pointer to a pathname on
success. On error, NULL is returned, and errno is set to
indicate the error. The function ttyname_r() returns 0 on
success, and an error number upon error.
EBADF Bad file descriptor.
ENODEV fd refers to a slave pseudoterminal device but the
corresponding pathname could not be found (see NOTES).
ENOTTY fd does not refer to a terminal device.
ERANGE (ttyname_r()) buflen was too small to allow storing the
pathname.
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.
A process that keeps a file descriptor that refers to a pts(4)
device open when switching to another mount namespace that uses a
different /dev/ptmx instance may still accidentally find that a
device path of the same name for that file descriptor exists.
However, this device path refers to a different device and thus
can't be used to access the device that the file descriptor
refers to. Calling ttyname() or ttyname_r() on the file
descriptor in the new mount namespace will cause these functions
to return NULL and set errno to ENODEV.
tty(1), fstat(2), ctermid(3), isatty(3), pts(4)
This page is part of release 5.13 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/.
Linux 2021-03-22 TTYNAME(3)
Pages that refer to this page: ctermid(3), getttyent(3), getutent(3), isatty(3), openpty(3), ptsname(3), ttyslot(3)
Copyright and license for this manual page
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