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td_ta_new() registers a target process with libthread_db and allocates an internal process handle of type td_thragent_t for this target process.
Subsequent calls to libthread_db can use this handle to refer to this target process.
There are actually two process handles, an internal process handle assigned by libthread_db and an external process handle assigned by the libthread_db client.
There is a one-to-one correspondence between the two handles. When the client calls a libthread_db routine, it uses the internal process handle. When libthread_db
calls one of the client-provided routines listed in proc_service(3PROC), it uses the
external process handle.
ph is the external process handle that libthread_db should use to identify this target process to the controlling process when it calls routines in the
imported interface.
If this call is successful, the value of the newly allocated td_thragent_t handle is returned in *ta_pp. td_ta_delete() deregisters
a target process with libthread_db, which deallocates its internal process handle and frees any other resources libthread_db has acquired with respect to the target
process. ta_p specifies the target process to be deregistered.
td_ta_get_ph() returns in *ph_pp the external process handle that corresponds to the internal process handle ta_p. This is
useful for checking internal consistency.
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