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NAME
     tt_fd - return a file descriptor

SYNOPSIS
     #include <Tt/tt_c.h>
     int tt_fd(void);

DESCRIPTION
     The  tt_fd()  function  returns  a  file  descriptor.    The
     returned  file  descriptor alerts the process that a message
     has arrived for the default procid in the default session.

     File descriptors are either active or  inactive.   When  the
     file  descriptor  becomes  active,  the  process  must  call
     tt_message_receive(3) to receive the message.

RETURN VALUE
     Upon successful completion, the tt_fd() function returns the
     file descriptor for the current procid.  The application can
     use  tt_int_error(3)  to  extract  one  of   the   following
     Tt_status values from the returned integer:

        TT_OK   The operation completed successfully.

        TT_ERR_NOMP
                The ttsession(1) process is not running  and  the
                ToolTalk service cannot restart it.

        TT_ERR_PROCID
                The current default process identifier is out  of
                date or invalid.

        TT_ERR_SESSION
                The specified ToolTalk session is out of date  or
                invalid.

APPLICATION USAGE
     The application must have a  separate  file  descriptor  for
     each  procid.   To  get  an  associated file descriptor, the
     application  should  use  tt_fd()   each   time   it   calls
     tt_open(3).

SEE ALSO
     tt_c(5), tt_open(3), tt_int_error(3), tt_message_receive(3).

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