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    Command:

    pty

    
    
    
    

    DESCRIPTION

         The pty driver provides support for the traditional BSD naming scheme
         that was used for accessing pseudo-terminals.  When the device /dev/ptyXX
         is being opened, a new terminal shall be created with the pts(4) driver.
         A device node for this terminal shall be created, which has the name
         /dev/ttyXX.
    
         New code should not try to allocate pseudo-terminals using this inter-
         face.  It is only provided for compatibility with older C libraries that
         tried to open such devices when posix_openpt(2) was being called.
    
    
    

    FILES

         The BSD-style compatibility pseudo-terminal driver uses the following
         device names:
    
         /dev/pty[l-sL-S][0-9a-v]  Pseudo-terminal master devices.
    
         /dev/tty[l-sL-S][0-9a-v]  Pseudo-terminal slave devices.
    
    
    

    DIAGNOSTICS

         None.
    
    
    

    SEE ALSO

         posix_openpt(2), pts(4), tty(4)
    
    
    

    HISTORY

         A pseudo-terminal driver appeared in 4.2BSD.
    
    
    

    BUGS

         Unlike previous implementations, the master slave device nodes are
         destroyed when the PTY becomes unused.  A call to stat(2) on a nonexis-
         tent master device will already cause a new master device node to be cre-
         ated.  The master device can only be destroyed by opening and closing it.
    
         The pty driver cannot be unloaded, because it cannot determine if it is
         being used.
    
    
    

    BSD August 20, 2008 BSD

    
    
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