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DNet
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servers.doc
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1986-11-21
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HOW TO WRITE SERVER PROGRAMS
SERVERS are run on demand by the DNET device driver. This is
accomplished by DNET doing a LoadSeg() and CreatProc(). The server
CANNOT GO THROUGH A NORMAL STARTUP for several reasons:
(1) There is no CLI and the message passed over the process
port is DNET specific (NOT a workbench message)
(2) Registers contain garbage (no argument line)
(3) No standard file handles exist
For AZTEC C, this is accomplished by overiding the standard _main with
your own. You must then setup the listen port and wait/reply the startup
message from DNET. See the source (for example, SERVER/STERM.C) for
an example.
The server can exit at any time after it DUnListen()'s the port. Multiple
DNET's will all use the same server for a specific port #.
_main()
{
struct Message *msg;
long mask, pmask, hdmask;
PROC *proc = FindTask(NULL);
Enable_Abort = 0;
LisPort= DListen(PORT_IALPHATERM);
WaitPort(&proc->pr_MsgPort);
ReplyMsg(GetMsg(&proc->pr_MsgPort));
if (!LisPort)
exit(1);
...