nlsgetcall() allows server processes started by the listener process to access the client's t_call structure, that is, the sndcall
argument of t_connect(3NSL).
The t_call structure returned by nlsgetcall() can be released using t_free(3NSL).
nlsgetcall() returns the address of an allocated t_call structure or NULL if a t_call structure cannot be allocated. If the t_alloc() succeeds, undefined environment variables are indicated by a negative len field in the appropriate netbuf structure. A len
field of zero in the netbuf structure is valid and means that the original buffer in the listener's t_call structure was NULL.
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