ttyname()

Get a fully qualified pathname for a file

Synopsis:

#include <unistd.h>

char *ttyname( int fildes );

Arguments:

fildes

A file descriptor that's associated with the file whose name you want to get.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The ttyname() function returns a pointer to a static buffer that contains a fully qualified pathname associated with the file associated with fildes.

Returns:

A pointer to the pathname for fildes, or NULL if an error occurred (errno is set).

Errors:

EAGAIN

The device driver was in use by another process, or the driver was unable to carry out the request due to an outstanding command in progress.

EBADF

The fildes argument isn't a valid file descriptor.

EINTR

The function was interrupted by a signal.

ENOSYS

The ttyname() function isn't implemented for the filesystem specified by filedes.

ENOTTY

The fildes argument doesn't refer to a tty.

EPERM

The process doesn't have sufficient permission to carry out the requested command.

Examples:

/*
 * The following program prints out the name
 * of the terminal associated with stdin.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main( void )
{
    if( isatty( 0 ) ) {
       printf( "%s\n", ttyname( 0 ) );
    } else {
       printf( "\n" );
    }
    return EXIT_SUCCESS;
}

Classification:

POSIX 1003.1

See also:

ctermid(), setsid(), ttyname_r()