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Linux man pages : ttyname (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 desc); int ttyname_r(int desc, 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 desc, or NULL on error (for example, if desc 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) Linux 2002-07-20 TTYNAME(3)