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SimpleServer.c
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C/C++ Source or Header
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1990-01-09
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7KB
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244 lines
/************************************************************
* *
* Trivial Server demo for IPC *
* *
* Pete Goodeve 89:4:01 *
* *
* [This module has only been compiled under Lattice; *
* it will need some modification for Manx/Aztec; *
* ... I'd be very grateful if someone would do the *
* conversion...] *
* *
* *
* This is just a "working skeleton" Server [shades of *
* Harryhausen...?] that simply opens a port, looks for *
* any LINE, TEXT, or STRG items it can print out in any *
* messages sent to it, and replies the message.. * *
* *
* (Note that it expects all messages to have a replyport *
* -- any that don't will be discarded without reclaiming *
* memory. Other servers can be set up to delete messages *
* properly if they follow the rules.) *
* *
* *
* The only special message ID recognized by this server *
* is QUIT, which always causes an immediate exit (after *
* replying to any remaining messages). *
* It will also quit if it is sent a cntrl-C break. *
* *
* *
************************************************************/
/*** This code has been written to be compiled under Lattice 4 or 5
* -- if you are using another compiler, you will have to adjust
* these includes (and maybe other parts of the code) to make it work.
***/
#ifdef LATTICE
#if LATTICE_40 | LATTICE_50
#include "IPC_proto.h"
/* ...else (not recent Lattice) will need library linkage stubs (IPC.o) */
#include <proto/exec.h>
#endif
#endif
/*** if proto/exec.h is not included, you should declare the following:
APTR OpenLibrary(char *, int);
void CloseLibrary(APTR);
struct Message * Getmsg(struct MsgPort *);
***/
/** (or without parameters if your compiler doesn't accept them) **/
#include "IPC.h"
#include "stdio.h"
#include "exec/memory.h"
#include "libraries/dos.h"
/************************************************************/
/*
* Define the ID codes recognized by server
*
* (MAKE_ID is defined in IPC.h)
*/
/* Message IDs: */
#define QUIT MAKE_ID('Q','U','I','T')
#define LINE MAKE_ID('L','I','N','E')
/* indicates a complete line of text -- omitting newline */
#define TEXT MAKE_ID('T','E','X','T')
/* Text block -- may include newlines */
#define STRG MAKE_ID('S','T','R','G')
/* general non-specific ASCII STRinG (normally less than a line) */
/************************************************************/
/*** Global Variables: ***/
struct Library * IPCBase = NULL; /* Base pointer for the IPC Library */
struct IPCPort *import=NULL; /* this is the port we serve */
struct IPCMessage *imsg=NULL; /* we only handle one message at a time,
so a global pointer is useful */
void procitem(); /* (just using old-style forward ref...)*/
void Cleanup();
int active = TRUE; /* when this goes FALSE, it's time to quit */
ULONG importsig = 0; /* signal mask for port */
/************************************************************/
/***************************
*
* Main program entry point:
*
***************************/
void main()
{
ULONG sigset; /* set to signals that woke up Wait() */
/* Before anything else, we need the IPC Library: */
IPCBase = OpenLibrary("ppipc.library",0);
if (!IPCBase) {
puts(
"Couldn't find ppipc.library!\nHave you installed it in LIBS: ?\n");
exit(20);
}
setnbf(stdout); /* so we can see output! (unbuffered) */
import = ServeIPCPort("Demo");
if (!import) {
puts("Print Server already exists ... exiting");
Cleanup();
return;
}
/* Get the signal bit for the port for later convenience: */
/* (Note that, because we did not include IPCPorts.h, IPCPorts
are identical to MsgPorts as far as the user is concerned;
if we DID need IPCPorts.h, this statement would have to
be changed appropriately.) */
importsig = 1<<import->mp_SigBit;
/*
*** The main loop: ***
* -- first we process any outstanding messages, looping until
* no more are found
* -- then we go to sleep until woken up by another message (or
* a cntrl-C).
*/
do {
while ( procimsg()) ; /* loop to satisfy messages */
/*
* Now wait for further messages, unless 'active' is FALSE
*/
if (active) {
/* Note that Wait() must be used rather than WaitPort()
if we want to wake up on IPP_NOTIFY as well as messages */
sigset = Wait(importsig | SIGBREAKF_CTRL_C);
if (sigset & SIGBREAKF_CTRL_C) {
active = FALSE;
ShutIPCPort(import); /* note: multiple calls don't hurt! */
continue; /* so we clear out any messages that sneak in */
}
}
} while (active);
/*** end of main loop ***/
puts("Server terminating...\n");
Cleanup();
}
/*** end of _main ***/
void Cleanup()
{
if (import) LeaveIPCPort(import);
CloseLibrary(IPCBase);
}
/************************************************************/
/*
* Process incoming messages
* -- returns FALSE if there are none, otherwise TRUE.
* (In a functional server this procedure would recognize the message ID
* and invoke the appropriate handling procedures.)
*/
procimsg() {
struct IPCItem *item;
int count, i;
if (!(imsg = (struct IPCMessage *) GetMsg(import))) return FALSE;
switch (imsg->ipc_Id) {
case QUIT:
active = FALSE;
ShutIPCPort(import);
puts("server got QUIT message...");
break;
default:
item = imsg->ipc_Items;
count = imsg->ipc_ItemCount;
for (i=0; i<count; i++)
procitem(&item[i]);
break;
}
if (imsg->ipc_Msg.mn_ReplyPort)
ReplyMsg(imsg);
else
puts("received message with no reply port -- MEMORY WILL BE LOST!!");
return TRUE;
}
void procitem(item) struct IPCItem *item;
{
switch (item->ii_Id) {
case LINE:
puts(item->ii_Ptr); /* this appends a newline */
break;
case TEXT:
fputs(item->ii_Ptr, stdout); /* this doesn't */
break;
case STRG:
fputs(item->ii_Ptr, stdout);
fputc('|', stdout); /* supply a separator */
break;
default:
item->ii_Flags |= IPC_NOTKNOWN;
imsg->ipc_Flags |= IPC_CHECKITEM;
break;
}
}
/************************************************************/