# posix_ctermid

(PHP 4, PHP 5, PHP 7)

posix_ctermid — Get path name of controlling terminal

### 说明

posix_ctermid ( void ) : string

Generates a string which is the pathname for the current controlling terminal for the process. On error this will set errno, which can be checked using posix_get_last_error()

### 返回值

Upon successful completion, returns string of the pathname to the current controlling terminal. Otherwise `FALSE` is returned and errno is set, which can be checked with posix_get_last_error().

### 范例

Example #1 posix_ctermid() example

This example will display the path to the current TTY.

    <?php
    echo "I am running from ".posix_ctermid();
    ?>

### 参见

- posix_ttyname() - Determine terminal device name
- posix_get_last_error() - Retrieve the error number set by the last posix function that failed