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Sweden-Number/ipc/dde_proc.c

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/***************************************************************************
* Copyright 1995, Technion, Israel Institute of Technology
* Electrical Eng, Software Lab.
* Author: Michael Veksler.
***************************************************************************
* File: dde_proc.c
* Purpose : DDE signals and processes functionality for DDE
***************************************************************************
*/
#ifdef CONFIG_IPC
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
#define msgbuf mymsg
#endif
#include <sys/time.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <sys/msg.h>
#include "windef.h"
#include "win.h"
#include "shm_semaph.h"
#include "shm_main_blk.h"
#include "dde_proc.h"
#include "dde_mem.h"
#include "dde.h"
#include "debug.h"
#include "xmalloc.h"
DECLARE_DEBUG_CHANNEL(dde)
DECLARE_DEBUG_CHANNEL(msg)
int curr_proc_idx= -1;
enum stop_wait_op stop_wait_op=CONT;
int had_SIGUSR2 = 0;
sigjmp_buf env_get_ack;
sigjmp_buf env_wait_x;
#define IDX_TO_HWND(idx) (0xfffe - (idx))
#define HWND_TO_IDX(wnd) (0xfffe - (wnd))
#define DDE_WIN_INFO(win) ( main_block->windows[HWND_TO_IDX(win)] )
#define DDE_WIN2PROC(win) ( DDE_WIN_INFO(win).proc_idx )
#define DDE_IsRemoteWindow(win) ( (win)<0xffff && (win)>=(0xffff-DDE_PROCS))
#define DDE_SEND 1
#define DDE_POST 2
#define DDE_ACK 3
#define DDE_MSG_SIZE sizeof(MSG16)
#define FREE_WND (WORD)(-2)
#define DELETED_WND (WORD)(-3)
static char *msg_type[4]={"********", "DDE_SEND", "DDE_POST", "DDE_ACK"};
struct msg_dat {
struct msgbuf dat;
char filler[DDE_MSG_SIZE];
} ;
typedef struct fifo_element {
int value;
struct fifo_element *next;
} fifo_element;
struct fifo {
fifo_element *first; /* first element in the fifo or NULL */
fifo_element *last; /* last element in the fifo or NULL */
};
static struct fifo fifo = {NULL,NULL};
void dde_proc_delete(int proc_idx);
void dde_proc_add_fifo(int val)
{
fifo_element *created;
created= (fifo_element*) xmalloc( sizeof(fifo_element) );
created->value = val;
created->next = NULL;
if (fifo.first==NULL)
fifo.first= created;
else
fifo.last->next= created;
fifo.last = created;
}
/* get an item from the fifo, and return it.
* If fifo is empty, return -1
*/
int dde_proc_shift_fifo()
{
int val;
fifo_element *deleted;
if (fifo.first == NULL)
return -1;
deleted= fifo.first;
val= deleted->value;
fifo.first= deleted->next;
if (fifo.first == NULL)
fifo.last= NULL;
free(deleted);
return val;
}
static void print_dde_message(char *desc, MSG16 *msg);
/* This should be run only when main_block is first allocated. */
void dde_proc_init(dde_proc proc)
{
int proc_num;
for (proc_num=0 ; proc_num<DDE_PROCS ; proc_num++, proc++) {
proc->msg=-1;
proc->sem=-1;
proc->shmid=-1;
proc->pid=-1;
}
}
/* add current process to the list of processes */
void dde_proc_add(dde_proc procs)
{
dde_proc proc;
int proc_idx;
TRACE(dde,"(..)\n");
shm_write_wait(main_block->sem);
/* find free proc_idx and allocate it */
for (proc_idx=0, proc=procs ; proc_idx<DDE_PROCS ; proc_idx++, proc++)
if (proc->pid==-1)
break; /* found! */
if (proc_idx<DDE_PROCS) { /* got here beacuse a free was found ? */
dde_msg_setup(&proc->msg);
proc->pid=getpid();
curr_proc_idx=proc_idx;
shm_sem_init(&proc->sem);
}
else {
fflush(stdout);
WARN(dde,"Can't allocate process\n");
}
shm_write_signal(main_block->sem);
}
/* wait for dde - acknowledge message - or timout */
static BOOL get_ack()
{
struct timeval timeout;
int size;
struct msg_dat ack_buff;
/* timeout after exactly one seconf */
timeout.tv_sec = 1;
timeout.tv_usec = 0;
sigsetjmp(env_get_ack, 1);
/* get here after normal execution, or after siglongjmp */
do { /* loop to wait for DDE_ACK */
had_SIGUSR2=0;
stop_wait_op=CONT; /* sensitive code: disallow siglongjmp */
size= msgrcv( main_block->proc[curr_proc_idx].msg , &ack_buff.dat,
1, DDE_ACK, IPC_NOWAIT);
if (size>=0) {
TRACE(msg,"get_ack: received DDE_ACK message\n");
return TRUE;
}
if (DDE_GetRemoteMessage()) {
had_SIGUSR2=1; /* might have recieved SIGUSR2 */
}
stop_wait_op=STOP_WAIT_ACK; /* allow siglongjmp */
} while (had_SIGUSR2); /* loop if SIGUSR2 was recieved */
/* siglongjmp should be enabled at this moment */
select( 0, NULL, NULL, NULL, &timeout );
stop_wait_op=CONT; /* disallow further siglongjmp */
/* timeout !! (otherwise there would have been a siglongjmp) */
return FALSE;
}
/* Transfer one message to a given process */
static BOOL DDE_DoOneMessage (int proc_idx, int size, struct msgbuf *msgbuf)
{
dde_proc proc= &main_block->proc[ proc_idx ];
if (proc_idx == curr_proc_idx)
return FALSE;
if (kill(proc->pid,0) < 0) {
/* pid does not exist, or not our */
dde_proc_delete(proc_idx);
return FALSE;
}
if (TRACE_ON(dde) || WARN_ON_dde) {
MSG16 *msg=(MSG16*) &msgbuf->mtext;
char *title;
if (msgbuf->mtype==DDE_SEND)
title="sending dde:";
else if (msgbuf->mtype==DDE_POST)
title="posting dde:";
else
title=NULL;
if (title)
print_dde_message(title, msg);
else
WARN(dde, "Unknown message type=0x%lx\n", msgbuf->mtype);
}
TRACE(msg, "to proc_idx=%d (pid=%d), queue=%u\n",
proc_idx, proc->pid, (unsigned)proc->msg);
if ( proc->msg != -1) {
TRACE(msg, "doing...(type=%s)\n", msg_type[msgbuf->mtype]);
size=msgsnd (proc->msg, msgbuf, size, 0);
if (size<0) {
fflush(stdout);
perror("msgsnd");
}
kill(proc->pid,SIGUSR2); /* tell the process there is a message */
TRACE(msg, "Trying to get acknowledgment from msg queue=%d\n",
proc->msg);
Yield16(); /* force task switch, and */
/* acknowledgment sending */
if (get_ack()) {
return TRUE;
} else {
fflush(stdout);
WARN(dde,"get_ack: DDE_DoOneMessage: timeout\n");
return FALSE;
}
}
else {
WARN(msg, "message not sent, target has no message queue\n");
return FALSE;
}
}
/* Do some sort of premitive hash table */
static HWND16 HWND_Local2Remote(HWND16 orig)
{
int dde_wnd_idx;
int deleted_idx= -1;
WND_DATA *tested;
WND_DATA *deleted= NULL;
int i;
dde_wnd_idx= orig % DDE_WINDOWS;
for ( i=0 ; i < DDE_WINDOWS ; i++, dde_wnd_idx++) {
if (dde_wnd_idx >= DDE_WINDOWS)
dde_wnd_idx -= DDE_WINDOWS; /* wrap-around */
tested= &main_block->windows[ dde_wnd_idx ];
if (tested->proc_idx == FREE_WND)
break;
if (deleted == NULL && tested->proc_idx == DELETED_WND) {
deleted= tested;
deleted_idx= dde_wnd_idx;
} else if (tested->wnd == orig && tested->proc_idx == curr_proc_idx) {
return IDX_TO_HWND(dde_wnd_idx);
}
}
if (deleted != NULL) { /* deleted is preferable */
/* free item, allocate it */
deleted->proc_idx= curr_proc_idx;
deleted->wnd = orig;
return IDX_TO_HWND(deleted_idx);
}
if (tested->proc_idx == FREE_WND) {
tested->proc_idx= curr_proc_idx;
tested->wnd = orig;
return IDX_TO_HWND(dde_wnd_idx);
}
WARN(dde, "Can't map any more windows to DDE windows\n");
return 0;
}
static BOOL DDE_DoMessage( MSG16 *msg, int type )
{
int proc_idx;
MSG16 *remote_message;
struct msg_dat msg_dat;
BOOL success;
if (msg->wParam == 0)
return FALSE;
if (main_block==NULL) {
if (msg->message >= WM_DDE_FIRST && msg->message <= WM_DDE_LAST)
DDE_IPC_init();
else
return FALSE;
}
if (msg->wParam == (HWND16)-1)
return FALSE;
if ( ! DDE_IsRemoteWindow(msg->hwnd) && msg->hwnd!= (HWND16)-1)
return FALSE;
TRACE(msg, "(hwnd=0x%x,msg=0x%x,..) - %s\n",
(int)msg->hwnd,(int)msg->message,msg_type[type]);
TRACE(msg, "(hwnd=0x%x,msg=0x%x,..) -- HWND_BROADCAST !\n",
(int)msg->hwnd,(int)msg->message);
remote_message=(void*)&msg_dat.dat.mtext;
memcpy(remote_message, msg, sizeof(*msg));
remote_message->wParam= HWND_Local2Remote(msg->wParam);
if (remote_message->wParam == 0)
return FALSE;
msg_dat.dat.mtype=type;
if (msg->hwnd == (HWND16)-1) {
success= FALSE;
for ( proc_idx=0; proc_idx < DDE_PROCS ; proc_idx++) {
if (proc_idx == curr_proc_idx)
continue;
if (main_block->proc[ proc_idx ].msg != -1)
success|=DDE_DoOneMessage(proc_idx, DDE_MSG_SIZE, &msg_dat.dat);
}
return success;
} else {
return DDE_DoOneMessage(DDE_WIN2PROC(msg->hwnd), DDE_MSG_SIZE,
&msg_dat.dat);
}
}
BOOL DDE_SendMessage( MSG16 *msg)
{
return DDE_DoMessage(msg, DDE_SEND);
}
BOOL DDE_PostMessage( MSG16 *msg)
{
return DDE_DoMessage(msg, DDE_POST);
}
void dde_proc_send_ack(HWND16 wnd, BOOL val) {
int proc,msg;
static struct msgbuf msg_ack={DDE_ACK,{'0'}};
proc=DDE_WIN2PROC(wnd);
msg=main_block->proc[proc].msg;
TRACE(msg,"sending ACK to wnd=%4x, proc=%d,msg=%d, pid=%d\n",
wnd,proc,msg,main_block->proc[proc].pid);
msg_ack.mtext[0]=val;
msgsnd (msg, &msg_ack, 1, 0);
kill(main_block->proc[proc].pid, SIGUSR2);
}
/* return true (non zero) if had a remote message */
#undef DDE_GetRemoteMessage
int DDE_GetRemoteMessage()
{
static int nesting=0; /* to avoid infinite recursion */
MSG16 *remote_message;
int size;
struct msg_dat msg_dat;
BOOL was_sent; /* sent/received */
BOOL passed;
WND *wndPtr;
if (curr_proc_idx==-1) /* do we have DDE initialized ? */
return 0;
if (nesting>10) {
fflush(stdout);
ERR(msg, "suspecting infinite recursion, exiting");
return 0;
}
remote_message=(void*)&msg_dat.dat.mtext;
/* test for SendMessage */
size= msgrcv( main_block->proc[curr_proc_idx].msg , &msg_dat.dat,
DDE_MSG_SIZE, DDE_SEND, IPC_NOWAIT);
if (size==DDE_MSG_SIZE) { /* is this a correct message (if any) ?*/
was_sent=TRUE;
TRACE(msg, "DDE:receive sent message. msg=%04x wPar=%04x"
" lPar=%08lx\n",
remote_message->message, remote_message->wParam,
remote_message->lParam);
} else {
size= msgrcv( main_block->proc[curr_proc_idx].msg , &msg_dat.dat,
DDE_MSG_SIZE, DDE_POST, IPC_NOWAIT);
if (size==DDE_MSG_SIZE) { /* is this a correct message (if any) ?*/
was_sent=FALSE;
TRACE(msg, "DDE:receive posted message. "
"msg=%04x wPar=%04x lPar=%08lx\n",
remote_message->message, remote_message->wParam,
remote_message->lParam);
}
else
return 0; /* no DDE message found */
}
/* At this point we are sure that there is a DDE message,
* was_sent is TRUE is the message was sent, and false if it was posted
*/
nesting++;
if (TRACE_ON(dde)) {
char *title;
if (was_sent)
title="receive sent dde:";
else
title="receive posted dde:";
print_dde_message(title, remote_message);
}
if (remote_message->hwnd != (HWND16) -1 ) {
HWND16 dde_window= DDE_WIN_INFO(remote_message->hwnd).wnd;
/* we should know exactly where to send the message (locally)*/
if (was_sent) {
TRACE(dde, "SendMessage(wnd=0x%04x, msg=0x%04x, wPar=0x%04x,"
"lPar=0x%08x\n", dde_window, remote_message->message,
remote_message->wParam, (int)remote_message->lParam);
/* execute the recieved message */
passed= SendMessage16(dde_window, remote_message->message,
remote_message->wParam, remote_message->lParam);
/* Tell the sended, that the message is here */
dde_proc_send_ack(remote_message->wParam, passed);
}
else {
passed= PostMessage16(dde_window, remote_message->message,
remote_message->wParam, remote_message->lParam);
if (passed == FALSE) {
/* Tell the sender, that the message is here, and failed */
dde_proc_send_ack(remote_message->wParam, FALSE);
}
else {
/* ack will be sent later, at the first peek/get message */
dde_proc_add_fifo(remote_message->wParam);
}
}
nesting--;
return 1;
}
/* iterate through all the windows */
for (wndPtr = WIN_FindWndPtr(GetTopWindow(GetDesktopWindow()));
wndPtr != NULL;
WIN_UpdateWndPtr(&wndPtr,wndPtr->next))
{
if (wndPtr->dwStyle & WS_POPUP || wndPtr->dwStyle & WS_CAPTION) {
if (was_sent)
SendMessage16( wndPtr->hwndSelf, remote_message->message,
remote_message->wParam, remote_message->lParam );
else
PostMessage16( wndPtr->hwndSelf, remote_message->message,
remote_message->wParam, remote_message->lParam );
} /* if */
} /* for */
/* replay with DDE_ACK after broadcasting in DDE_GetRemoteMessage */
dde_proc_send_ack(remote_message->wParam, TRUE);
nesting--;
return 1;
}
int dde_reschedule()
{
int ack_wnd;
ack_wnd= dde_proc_shift_fifo();
if (ack_wnd != -1) {
dde_proc_send_ack(ack_wnd, TRUE);
usleep(10000); /* force unix task switch */
return 1;
}
return 0;
}
void dde_msg_setup(int *msg_ptr)
{
*msg_ptr= msgget (IPC_PRIVATE, IPC_CREAT | 0700);
if (*msg_ptr==-1)
perror("dde_msg_setup fails to get message queue");
}
/* do we have dde handling in the window ?
* If we have, atom usage will make this instance of wine set up
* it's IPC stuff.
*/
void DDE_TestDDE(HWND16 hwnd)
{
static in_test = 0;
if (in_test++) return;
if (main_block != NULL) {
in_test--;
return;
}
TRACE(msg,"(0x%04x)\n", hwnd);
if (hwnd==0)
hwnd=-1;
/* just send a message to see how things are going */
SendMessage16( hwnd, WM_DDE_INITIATE, 0, 0);
in_test--;
}
void dde_proc_delete(int proc_idx)
{
dde_proc_done(&main_block->proc[proc_idx]);
}
void stop_wait(int a)
{
had_SIGUSR2=1;
switch(stop_wait_op) {
case STOP_WAIT_ACK:
siglongjmp(env_get_ack,1);
break; /* never reached */
case STOP_WAIT_X:
siglongjmp(env_wait_x,1);
break; /* never reached */
case CONT:
/* do nothing */
}
}
static void print_dde_message(char *desc, MSG16 *msg)
{
/* extern const char *MessageTypeNames[];*/
extern int debug_last_handle_size;
WORD wStatus,hWord;
void *ptr;
DDEACK *ddeack;
DDEADVISE *ddeadvise;
DDEDATA *ddedata;
DDEPOKE *ddepoke;
dbg_decl_str(dde, 2048);
if (is_dde_handle(msg->lParam & 0xffff) )
ptr=DDE_AttachHandle(msg->lParam&0xffff, NULL);
else
ptr =NULL;
wStatus=LOWORD(msg->lParam);
hWord=HIWORD(msg->lParam);
dsprintf(dde,"%s", desc);
dsprintf(dde,"%04x %04x==%s %04x %08lx ",
msg->hwnd, msg->message,"",/*MessageTypeNames[msg->message],*/
msg->wParam, msg->lParam);
switch(msg->message) {
case WM_DDE_INITIATE:
case WM_DDE_REQUEST:
case WM_DDE_EXECUTE:
case WM_DDE_TERMINATE:
/* nothing to do */
break;
case WM_DDE_ADVISE:
/* DDEADVISE: hOptions in WM_DDE_ADVISE message */
if (ptr) {
ddeadvise=ptr;
dsprintf(dde,"fDeferUpd=%d,fAckReq=%d,cfFormat=0x%x",
ddeadvise->fDeferUpd, ddeadvise->fAckReq,
ddeadvise->cfFormat);
} else
dsprintf(dde,"NO-DATA");
dsprintf(dde," atom=0x%x",hWord);
break;
case WM_DDE_UNADVISE:
dsprintf(dde,"format=0x%x, atom=0x%x",wStatus,hWord);
break;
case WM_DDE_ACK:
ddeack=(DDEACK*)&wStatus;
dsprintf(dde,"bAppReturnCode=%d,fBusy=%d,fAck=%d",
ddeack->bAppReturnCode, ddeack->fBusy, ddeack->fAck);
if (ddeack->fAck)
dsprintf(dde,"(True)");
else
dsprintf(dde,"(False)");
break;
case WM_DDE_DATA:
if (ptr) {
ddedata=ptr;
dsprintf(dde,"fResponse=%d,fRelease=%d,"
"fAckReq=%d,cfFormat=0x%x,value=\"%.*s\"",
ddedata->fResponse, ddedata->fRelease,
ddedata->fAckReq, ddedata->cfFormat,
debug_last_handle_size- (int)sizeof(*ddedata)+1,
ddedata->Value);
} else
dsprintf(dde,"NO-DATA");
dsprintf(dde," atom=0x%04x",hWord);
break;
case WM_DDE_POKE:
if (ptr) {
ddepoke=ptr;
dsprintf(dde,"fRelease=%d,cfFormat=0x%x,value[0]='%c'",
ddepoke->fRelease, ddepoke->cfFormat, ddepoke->Value[0]);
} else
dsprintf(dde,"NO-DATA");
dsprintf(dde," atom=0x%04x",hWord);
break;
}
TRACE(dde,"%s\n", dbg_str(dde));
}
void dde_proc_done(dde_proc proc)
{
if (proc->msg != -1)
msgctl(proc->msg, IPC_RMID, NULL);
proc->msg=-1;
proc->pid=-1;
shm_delete_chain(&proc->shmid);
shm_sem_done(&proc->sem);
}
/* delete entry, if old junk */
void dde_proc_refresh(dde_proc proc)
{
if (proc->pid == -1)
return;
if (kill(proc->pid, 0) != -1)
return;
/* get here if entry non empty, and the process does not exist */
dde_proc_done(proc);
}
void dde_wnd_setup()
{
int i;
for (i=0 ; i < DDE_WINDOWS ; i++)
main_block->windows[i].proc_idx = FREE_WND;
}
static BOOL DDE_ProcHasWindows(int proc_idx)
{
WND_DATA *tested;
int i;
for ( i=0 ; i < DDE_WINDOWS ; i++) {
tested= &main_block->windows[ i ];
if (tested->proc_idx == proc_idx)
return TRUE;
}
return FALSE;
}
/* Look for hwnd in the hash table of DDE windows,
* Delete it from there. If there are no more windows for this
* process, remove the process from the DDE data-structure.
* If there are no more processes - delete the whole DDE struff.
*
* This is inefficient, but who cares for the efficiency of this rare
* operation...
*/
void DDE_DestroyWindow(HWND16 hwnd)
{
int dde_wnd_idx;
WND_DATA *tested;
int i;
if (main_block == NULL)
return;
dde_wnd_idx= hwnd % DDE_WINDOWS;
for ( i=0 ; i < DDE_WINDOWS ; i++, dde_wnd_idx++) {
if (dde_wnd_idx >= DDE_WINDOWS)
dde_wnd_idx -= DDE_WINDOWS; /* wrap-around */
tested= &main_block->windows[ dde_wnd_idx ];
if (tested->proc_idx == FREE_WND)
return; /* No window will get deleted here */
if (tested->wnd == hwnd && tested->proc_idx == curr_proc_idx) {
dde_reschedule();
tested->proc_idx= DELETED_WND;
if (DDE_ProcHasWindows( curr_proc_idx ))
return;
while (dde_reschedule()) /* make sure there are no other */
/* processes waiting for acknowledgment */
;
dde_proc_delete( curr_proc_idx );
if (DDE_no_of_attached() == 1)
shm_delete_all(-1);
else {
shmdt( (void *) main_block);
main_block= NULL;
}
return;
}
}
}
#endif /* CONFIG_IPC */
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