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   libexpect    ( 3 )

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IF YOU WANT TO ALLOCATE YOUR OWN PTY

extern int exp_autoallocpty;
       extern int exp_pty[2];

       The spawn functions use a pty to communicate with the process.
       By default, a pty is automatically allocated each time a process
       is spawned.  If you want to allocate ptys yourself, before
       calling one of the spawn functions, set exp_autoallocpty to 0,
       exp_pty[0] to the master pty file descriptor and exp_pty[1] to
       the slave pty file descriptor.  The expect library will not do
       any pty initializations (e.g., exp_stty_init will not be used).
       The slave pty file descriptor will be automatically closed when
       the process is spawned.  After the process is started, all
       further communication takes place with the master pty file
       descriptor.

       exp_spawnl and exp_spawnv duplicate the shell's actions in
       searching for an executable file in a list of directories.  The
       directory list is obtained from the environment.