ttyname - Online Linux Manual PageSection : 3
Updated : 2022-12-15
Source : Linux man-pages 6.03

NAMEttyname, ttyname_r − return name of a terminal

LIBRARYStandard C library (libc, −lc)

SYNOPSIS#include <unistd.h>char *ttyname(int fd); int ttyname_r(int fd, char buf[.buflen], size_t buflen);

DESCRIPTIONThe 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 VALUEThe 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.

ERRORSEBADF  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.

ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue ttyname() Thread safetyMT-Unsafe race:ttyname ttyname_r() Thread safetyMT-Safe

STANDARDSPOSIX.1-2001, POSIX.1-2008, 4.2BSD.

NOTESA 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.

SEE ALSOtty(1), fstat(2), ctermid(3), isatty(3), pts(4)
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