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ttyname_r (3)
TTYNAME(3) Linux Programmer's Manual TTYNAME(3)
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 path-
name 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
4.2BSD, POSIX.1-2001.
SEE ALSO
fstat(2), isatty(3)
Linux 2002-07-20 TTYNAME(3)
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