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:

    The operation completed successfully.
    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).