tt_open(3)

NAME
     tt_open - return the process identifier for the calling process

SYNOPSIS
     #include <Tt/tt_c.h>
     char *tt_open(void);

DESCRIPTION
     The tt_open() function returns the process identifier for the calling
     process.

RETURN VALUE
     The tt_open() function also sets this identifier as the default procid
     for the process.  The tt_open(3) function is typically the first ToolTalk
     function called by a process.

     The application must call tt_open(3) before other tt_ calls are made.
     However, there are two exceptions:  tt_default_session_set(3) and
     tt_X_session(3) can be called before tt_open().

     A process can call tt_open() more than once to obtain multiple procids.
     To open another session, the process must make the following calls in the
     order specified:

          tt_default_session_set(3)
          tt_open()

RETURN VALUE
     Upon successful completion, the tt_open() function returns the character
     value that uniquely identifies the process.  The application can use
     tt_ptr_error(3) to extract one of the following Tt_status values from the
     returned pointer:

        TT_OK   The operation completed successfully.

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

APPLICATION USAGE
     The application should use tt_free(3) to free any data stored in the
     address returned by the ToolTalk API.

     Each procid has its own associated file descriptor, and can join another
     session.  To switch to another procid, the application should call
     tt_default_procid_set().

SEE ALSO
     Tttt_c(5), tt_fd(3), tt_default_procid(3), tt_default_procid_set(3),
     tt_default_session(3), tt_default_session_set(3), tt_ptr_error(3),
     tt_free(3).