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AmigaDOS Packets
Revision as of 18:07, 27 April 2012 by Steven Solie (talk | contribs) (Created page with "Packet passing handles all communication performed by AmigaDOS between processes. The function diagram below shows how packets fit in with the other components of the Amiga op...")
Packet passing handles all communication performed by AmigaDOS between processes. The function diagram below shows how packets fit in with the other components of the Amiga operating system.
+--------------+
| User Process +-----------------------+
+-------+------+ |
| |
| |
Function Calls |
| |
\|/ |
+---------+--------+ |
| AmigaDOS Open(), | |
| Close(), etc. | |
+---------+--------+ |
| |
| |
+-Packets---+--------+ +-----Packets--------+
| | | | | |
\|/ \|/ \|/ \|/ \|/ \|/
+----+----+ +----+----+ +-+--+--+-+ +----+----+ +----+----+
| FFS/OFS | | FFS/OFS | | FFS/OFS | | CON: | | CON: |
| DH0: | | DF0: | | DF1: | | Window1 | | Window2 |
| Handler | | Handler | | Handler | | Handler | | Handler |
| Process | | Process | | Process | | Process | | Process |
+----+----+ +-------+-+ +----+----+ +----+----+ +----+----+
| | | | |
\|/ \|/ \|/ \|/ \|/
+----+--------+ +--+--------+----+ +----+-----------+----+
|Hddisk.device| |Trackdisk.device| | Console.device |
+-------------+ +----------------+ +---------------------+
A StandardPacket (defined in <dos/dosextens.h>) is used to send packet commands to a process's MsgPort. The StandardPacket structure contains an Exec Message structure and an AmigaDOS DOSPacket structure:
