dispatch.c
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/*
* dispatch.c: select loop
*
* Copyright 1995, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
* the contents of this file may not be disclosed to third parties, copied or
* duplicated in any form, in whole or in part, without the prior written
* permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to restrictions
* as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
* and Computer Software clause at DFARS 252.227-7013, and/or in similar or
* successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
* rights reserved under the Copyright Laws of the United States.
*
* $Revision: 1.1.1.1 $
*/
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <mutex.h>
#include <string.h>
#include <bstring.h>
#include <alloca.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
/*
* includes needed for socket stuff
*/
#include <sys/un.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include "driverd.h"
#include "utils.h"
#include "sys/u64gio.h"
#include "os.h"
#include "em.h"
#include "ramrom.h"
char isItTimeToYield;
unsigned long dispatchException = 0;
extern int MaxClients;
extern int currentMaxClients;
extern int numListeningSockets;
extern uint ListeningSockets[];
extern fd_set SelectReturnMask; /* select returns available fd's in this set */
extern ClientPtr *clients;
extern int nextFreeClientID; /* always MIN free client ID */
int nClients; /* number of active clients */
extern int verbose_flag;
#define MAX_REQUEST_SIZE 65535
static int ANYSET(fd_set * const);
static int eventfdlist[64]; /* assume that 0 is not a socket fd */
static ClientPtr EmulatorClient;
static int shmkey;
void *shmaddr; /* for emulator I/F, the address of shared memory */
static char writebuffer[8192];
/*
* EstablishNewConnection():
*
* If anyone is waiting on the well known socket, accept them.
* Returns a mask with indices of new clients. Updates AllSockets
* to include the new socket connection.
*/
int
EstablishNewConnection(void *closure)
{
int socket; /* fd of listener that's ready */
int newconn; /* fd of new client */
int i;
ClientPtr client;
union {
struct sockaddr sa;
struct sockaddr_un un;
struct sockaddr_in in;
} from;
int fromlen;
socket = *(int *)closure;
if ((newconn = accept(socket, NULL, NULL)) < 0)
return 0;
fromlen = sizeof(from);
if (!getpeername(newconn, &from.sa, &fromlen)) {
if (fromlen && (from.sa.sa_family == AF_INET)) {
int mi = 1;
setsockopt(newconn, IPPROTO_TCP, TCP_NODELAY,
(char *)&mi, sizeof(int));
}
}
/*(void) fcntl(newconn, F_SETFL, O_NONBLOCK);*/
if (AddNewClient(newconn) < 0) {
fprintf(stderr, "Driverd: Unable to add new client\n");
close(newconn);
return 0;
}
return 1;
}
/*
* Transcribe info from the client which will be of use later when processing
* commands.
*/
void RegisterClient(ClientPtr client, registerSessionPtr pData)
{
int reply;
client->id = pData->id; /* PID (to be used when signalling emulator) */
if (EmulatorClient) {
reply = 1;
Trace("Register Client OK\n");
} else {
reply = 0;
Trace("Register Client no emulator yet\n");
}
write(client->fd, &reply, sizeof(reply));
if (verbose_flag)
fprintf(stderr, "Driverd: Register client %d\n", client->id);
}
void RegisterEmulatorClient(ClientPtr client, RegisterEmulator *pData)
{
int sid;
client->id = pData->id; /* PID (to be used when signalling emulator) */
EmulatorClient = client;
shmkey = pData->shmkey;
sid = shmget(shmkey, RAMROM_MSG_SIZE, IPC_CREAT | 0600);
if (sid == -1)
{
perror("Error getting shm ID");
exit(1);
}
shmaddr = shmat(sid, 0, 0);
if ((int)shmaddr == -1)
{
perror("RegisterEmulatorClient Error getting shm addr");
exit(1);
}
if (verbose_flag)
fprintf(stderr, "Driverd: Register Emulator %d\n", client->id);
}
/*
* Read an event from the game & dispatch to interested clients via writes on
* their sockets.
*/
void ProcessEventFromGame(ClientPtr client, eventFromGamePtr pData)
{
char event;
int numWritten;
event = pData->event;
if (verbose_flag)
fprintf(stderr, "Driverd: Event from Game %d\n", event);
#ifdef DEBUG
fprintf(stderr, "Driverd: Received event %d; attempting to dispatch...\n", event);
#endif
if (event < 0 || event > 63) {
fprintf(stderr, "Driverd: ProcessEventFromGame: event out of range %d\n", event);
}
if (eventfdlist[event] > 0) {
numWritten = write(eventfdlist[event], &event, sizeof(event));
if (numWritten != sizeof(event)) {
fprintf(stderr, "Driverd: Bad write to %d (passing event 0x%x)\n",
eventfdlist[event], event);
}
} else {
fprintf(stderr, "Driverd: ProcessEventFromGame: no one interested in %d queue it\n",
event);
eventfdlist[event] = -1;
}
}
/*
* SendCommandToGame():
*
* daemon receives commands from host side clients,
* arbitrates for control of ramrom, writes the command into ramrom,
* sends a signal to the game to tell it to read the ramrom arena, then
* waits for an acknowledge to come back from the game indicating that the
* command has been accepted (so that the daemon could begin a new command
* arbitration if needed).
*
void SendCommandToGame(ClientPtr client, commandToGamePtr pData)
{
}
*/
/* XXX what happens if client goes away in middle? */
int
readn(int fd, void *buf, int nbytes)
{
unsigned char *bp;
int n, ret;
ret = nbytes;
while (nbytes) {
n = read(fd, buf, nbytes);
if (n < 0) {
printf("readn failure fd %d, n is %d\n", fd, n);
perror("XXX");
return n;
}
buf = (void *)((int)buf + n);
nbytes -= n;
}
return ret;
}
/*
* Note that the last 8 bytes of the shared memory special are used
* to pass the GIOinterrupt value, and what to copy to RAMROM
*/
void
InterruptGame(int pid, unsigned long value, unsigned long bufaddr)
{
*(u32 *)((int)shmaddr + SHM_MSG_BUFFER_ADDRESS) = bufaddr;
*(u32 *)((int)shmaddr + SHM_CART_INT_REGISTER) = value;
kill(pid, SIGCART);
}
void
HandleIoctl(ClientPtr client, IoctlRequest *ioc)
{
int reply;
EventFromGame game;
switch (ioc->request) {
case U64_READ: {
u64_read_arg_t readarg;
int count, *addr;
if (verbose_flag)
fprintf(stderr, "Driverd: U64_READ client %d\n", client->id);
readn(client->fd, &readarg, sizeof(readarg));
/* Now grab data out of shared buffer and send to client */
addr = (int *)((int)shmaddr + (readarg.ramrom_addr - RAMROM_MSG_ADDR));
count = *addr++;
if (count > readarg.nbytes)
count = readarg.nbytes;
write(client->fd, &count, sizeof(count));
write(client->fd, addr, count);
/* We have data, ok for game to continue */
InterruptGame(EmulatorClient->id, readarg.value, 0);
/* wait for response interrupt */
readn(EmulatorClient->fd, &game, sizeof(game));
reply = count;
Trace("U64_READ done\n");
break;
}
case U64_SAFE_WRITE: {
u64_write_arg_t writearg;
int count, *addr;
if (verbose_flag)
fprintf(stderr, "Driverd: U64_SAFE_WRITE client %d\n", client->id);
readn(client->fd, &writearg, sizeof(writearg));
readn(client->fd, writebuffer, writearg.nbytes);
/*
* First stop the game from accessing the ROM (wait for reply)
*/
InterruptGame(EmulatorClient->id, HOST_PIACCESS_REQ, 0);
/* wait for response interrupt */
readn(EmulatorClient->fd, &game, sizeof(game));
Trace("U64_SAFE_WRITE first game intr\n");
/* now transfer the data */
addr = (int *)((int)shmaddr + (writearg.ramrom_addr - RAMROM_MSG_ADDR));
*addr++ = writearg.nbytes;
bcopy(writebuffer, addr, writearg.nbytes);
InterruptGame(EmulatorClient->id, writearg.value, writearg.ramrom_addr);
/* wait for response interrupt */
readn(EmulatorClient->fd, &game, sizeof(game));
Trace("U64_SAFE_WRITE second game intr\n");
/* Tell client that ioctl is done */
write(client->fd, &reply, sizeof(reply));
Trace("U64_SAFE_WRITE done\n");
break;
}
case U64_WRITE: {
u64_write_arg_t writearg;
int count, *addr;
if (verbose_flag)
fprintf(stderr, "Driverd: U64_WRITE client %d\n", client->id);
readn(client->fd, &writearg, sizeof(writearg));
readn(client->fd, writebuffer, writearg.nbytes);
/* now transfer the data */
addr = (int *)((int)shmaddr + (writearg.ramrom_addr - RAMROM_MSG_ADDR));
*addr++ = writearg.nbytes;
bcopy(writebuffer, addr, writearg.nbytes);
InterruptGame(EmulatorClient->id, writearg.value, writearg.ramrom_addr);
/* wait for response interrupt */
readn(EmulatorClient->fd, &game, sizeof(game));
/* Tell client that ioctl is done */
write(client->fd, &reply, sizeof(reply));
Trace("U64_WRITE done\n");
break;
}
case U64_LISTEN: {
int event, sendevent;
EventFromGame game;
if (verbose_flag)
fprintf(stderr, "Driverd: U64_LISTEN client %d\n", client->id);
readn(client->fd, &event, sizeof(event));
if (eventfdlist[event] == -1)
sendevent = 1;
else
sendevent = 0;
eventfdlist[event] = client->fd;
if (sendevent) {
game.event = event;
ProcessEventFromGame(client, &game);
}
break;
}
default:
fprintf(stderr, "Driverd: HandleIoctl(): unknown ioctl 0x%x\n", ioc->request);
}
}
/*
* Read a command or event from the specified file descriptor.
*/
void
readRequestFromClient(ClientPtr client)
{
int pend;
int numread;
unsigned int data[256]; /* XXX enough? maybe we should malloc? */
int i;
unsigned int dd_header;
if (ioctl(client->fd, FIONREAD, (char *) &pend) < 0) {
fprintf(stderr,
"Driverd: readRequestFromClient(): Unable to check to see how many bytes are pending.\n");
/* XXX exit? */
} else {
if (pend == 0) {
/*
* Client's gone. Nuke 'em, and remove them from the AllSockets
* fd_set, so that select won't continuously return, telling us to
* read zero bytes of data from a dead client.
*/
CloseDownClient(client);
/* XXX return? */
}
readn(client->fd, &dd_header, sizeof(dd_header));
#ifdef DEBUG
fprintf(stderr, "Driverd: fd %d, numread = %d, pend num = %d, dd_header 0x%x\n",
client->fd, numread, pend, dd_header);
fflush(stderr);
#endif
/*
* Determine what kind of command we received, and invoke the
* appropriate action.
*
* XXX assumes that we always read complete command buffers;
* we must check to see if we have read a complete command struct here.
*/
switch (dd_header) {
case DRIVERD_REGISTER_SESSION:
{
RegisterSession session;
numread = readn(client->fd, &session.id,
sizeof(RegisterSession) - sizeof(dd_header));
if (numread != sizeof(RegisterSession) - sizeof(dd_header)) {
fprintf(stderr,
"Driverd: RS - read mismatch from %d: exp %d bytes, read %d\n",
client->fd, sizeof(RegisterSession), numread);
} else {
RegisterClient(client, &session);
}
break;
}
case DRIVERD_REGISTER_EMULATOR: {
RegisterEmulator emulator;
numread = readn(client->fd, &emulator.id,
sizeof(RegisterEmulator) - sizeof(dd_header));
if (numread != sizeof(RegisterEmulator) - sizeof(dd_header)) {
fprintf(stderr,
"Driverd: RE - read mismatch from fd %d: %d != %d\n",
client->fd, sizeof(RegisterEmulator), numread);
} else {
RegisterEmulatorClient(client, &emulator);
}
break;
}
case DRIVERD_EVENT_FROM_GAME: {
EventFromGame game;
numread = readn(client->fd, &game.event,
sizeof(EventFromGame) - sizeof(dd_header));
if (numread != sizeof(EventFromGame) - sizeof(dd_header)) {
fprintf(stderr,
"Driverd: EG - read mismatch from fd %d: %d != %d\n",
client->fd, sizeof(EventFromGame), numread);
} else {
ProcessEventFromGame(client, &game);
}
break;
}
case DRIVERD_IOCTL_REQUEST: {
IoctlRequest request;
numread = readn(client->fd, &request.request,
sizeof(IoctlRequest) - sizeof(dd_header));
if (numread != sizeof(IoctlRequest) - sizeof(dd_header)) {
fprintf(stderr,
"Driverd: IR - read mismatch from fd %d: %d != %d\n",
client->fd, numread,
sizeof(IoctlRequest) - sizeof(dd_header));
} else {
HandleIoctl(client, &request);
}
break;
}
default:
fprintf(stderr, "Driverd: Unexpected action 0x%x from client fd %d\n",
dd_header, client->fd);
break;
}
}
}
void
Dispatch(void)
{
int result;
ClientPtr client;
int nready;
int i;
nextFreeClientID = 0;
nClients = 0;
while (1)
{
nready = WaitForSomething();
/*
* Check for clients with work for us to do. Process them in fd order
* (not necessarily fair, but we'll get to everyone eventually).
*/
for (i = 0; i < nClients; i++) {
if (FD_ISSET(clients[i]->fd, &SelectReturnMask)) {
FD_CLR(clients[i]->fd, &SelectReturnMask);
/*
* Read from the socket & do driver emulation stuff.
*/
readRequestFromClient(clients[i]);
}
}
/*
* Check for new clients seeking to establish a private fd comm link
* with the daemon.
*/
for (i = 0; i < numListeningSockets; i++) {
if (FD_ISSET(ListeningSockets[i], &SelectReturnMask)) {
FD_CLR(ListeningSockets[i], &SelectReturnMask);
EstablishNewConnection((void *)&ListeningSockets[i]);
}
}
}
}