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AX = 0004h DX = protocol ID (see AX=0007h,#03849)
Return:
AX = completion code (see also #03846) 0000h successful ES:BX -> Memory Buffer (Mbuf) (see #03847)
Note: If the DLI has no free Mbufs, it will set an internal flag for the protocol and later call the protocol's Event Upcall with EV_BUFFER_AVAILABLE (see #03853,#03854) as soon as an Mbuf becomes available. There will only be one "buffer available" Upcall, even if this function has been called several times before.
See Also: AX=0005h - AX=0006h - AX=0012h - AX=0013h
Format of SK-UPPS Memory Buffer (Mbuf): Offset Size Description (Table 03847) 00h DWORD -> NEXT Mbuf (linked list) 04h WORD OFFSET of actual data within DATA area 06h 2 BYTEs reserved (currently unused) 08h WORD LENGTH of actual data found in DATA area starting at OFFSET 0Ah 2 BYTEs reserved (currently unused) 0Ch DWORD -> DATA area (size can be obtained via AX=000Eh call) 10h WORD PROTOCOL ID of protocol currently "owning" the Mbuf 12h BYTE IN USE flag; nonzero if Mbuf still in use by DLI (see AX=0006h) 13h BYTE RECEIVE STATUS (bit 0-7 only; see AX=0007h - Receive Upcall)
Category: Network - Int 7Ch - S
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