- new function in WINGs: WMSetConnectionShutdownOnClose()

- new callback in the ConnectionDelegate structure: canResumeSending
- replaced setpgid() with setsid() when starting kids, to allow them to
  survive if wmaker (the parent) dies.
- a few cleanups.

WINGs/ChangeLog

@@ -1,3 +1,10 @@
+Changes since wmaker 0.80.1:
+............................
+
+- added WMSetConnectionShutdownOnClose()
+- added an extra member to the ConnectionDelegate: canResumeSending
+  see NEWS for details.
+
 Changes since wmaker 0.80.0:
 ............................
 

WINGs/Examples/connect.c

@@ -28,6 +28,7 @@ static void didInitialize(ConnectionDelegate *self, WMConnection *cPtr);
 
 static ConnectionDelegate socketDelegate = {
     NULL,              /* data */
+    NULL,              /* canResumeSending */
     NULL,              /* didCatchException */
     connectionDidDie,  /* didDie */
     didInitialize,     /* didInitialize */

WINGs/Examples/server.c

@@ -42,6 +42,7 @@ static WMConnection *serverPtr = NULL;
 
 static ConnectionDelegate socketDelegate = {
     NULL,                 /* client data */
+    NULL,                 /* canResumeSending */
     NULL,                 /* didCatchException */
     connectionDidDie,     /* didDie */
     NULL,                 /* didInitialize */

WINGs/NEWS

@@ -1,3 +1,55 @@
+*** Mon Sep 09 06:58:30 EEST 2002 - Dan
+
+New delegate for the WMConnection class
+---------------------------------------
+
+ConnectionDelegate structure has a new member: canResumeSending.
+The purpose of this callback is to notify you that you can resume sending
+data over a WMConnection.
+It works in the following manner:
+
+WMSendConnectionData() can return 3 values: -1, 0, 1
+
+-1 - means that the connection has died. you should stop sending data and
+     close the connection ASAP.
+ 1 - means that the data was succesfully sent
+ 0 - means that the data (or part of it) was not sent. however, it was saved
+     in a queue and the library will try to send it later when possible.
+
+if the return value is 1, you can continue to send the next message, and so
+on, until the return value of such a send call will be 0.
+In this case you can continue sending, however, the data will not be sent
+over the connection because the operating system cannot accept any more data
+for the moment. Instead it will be queued inside the library, making your
+program's memory footprint increase. If the ammount of data you need to
+send is limited and not too big, this shouldn't be a problem, because your
+data will be queued and sent when the operating system will notify the
+library that sending is possible again.
+If this is the case you can just ignore the output of WMSendConnectionData()
+and not set a callback for canResumeSending.
+
+However, if the ammount of data you have to send is undetermined and you
+also want to keep a small memory footprint for your program (so that it
+won't grow until it uses all your available memory ;) ), you will have to
+stop sending data over the connection as soon as WMSendConnectionData()
+returns with 0. Then you should somehow mark this situation in your program
+to avoid it trying to send anymore data until notified that it can resume.
+(You should have also set a canResumeSending callback when you initialized
+your WMConnection object because else you cannot be notified when to resume.)
+
+Now, when you receive such a 0 from the send operation, your last sent data
+is put in a queue inside the library. At a later time when the operating
+system notifies the library that sending is possible again, the library will
+resume to send the data that is saved in the queue. After it will be able to
+send all the data in the queue, the canResumeSending callback will be
+called, letting you know that not only you can resume sending because the
+operating system is again able to send data, but also that the queue was
+completely flushed.
+
+From the canResumeSending callback, you should again update the status of
+your program marking that it can send again, and then resume sending the
+data from where you were left.
+
 
 *** Thu Oct 04 06:00:09 EEST 2001 -Dan
 

WINGs/WINGs/WUtil.h

@@ -184,8 +184,9 @@ typedef struct {
 typedef struct ConnectionDelegate {
     void *data;
 
-    void (*didCatchException)(struct ConnectionDelegate *self,
-                              WMConnection *cPtr);
+    void (*canResumeSending)(struct ConnectionDelegate *self, WMConnection *cPtr);
+
+    void (*didCatchException)(struct ConnectionDelegate *self, WMConnection *cPtr);
 
     void (*didDie)(struct ConnectionDelegate *self, WMConnection *cPtr);
 
@@ -977,6 +978,8 @@ Bool WMSetConnectionNonBlocking(WMConnection *cPtr, Bool flag);
 
 Bool WMSetConnectionCloseOnExec(WMConnection *cPtr, Bool flag);
 
+void WMSetConnectionShutdownOnClose(WMConnection *cPtr, Bool flag);
+
 void* WMGetConnectionClientData(WMConnection *cPtr);
 
 void WMSetConnectionClientData(WMConnection *cPtr, void *data);

WINGs/connection.c

@@ -1,8 +1,8 @@
 /*
  *  WINGs WMConnection function library
- * 
+ *
  *  Copyright (c) 1999-2002 Dan Pascu
- * 
+ *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
@@ -121,6 +121,7 @@ typedef struct W_Connection {
     char *protocol;
 
     Bool closeOnRelease;
+    Bool shutdownOnClose;
     Bool wasNonBlocking;
     Bool isNonBlocking;
 
@@ -192,9 +193,10 @@ inputHandler(int fd, int mask, void *clientData)
         return;
 
     if ((mask & WIWriteMask)) {
+        int result;
+
         if (cPtr->state == WCInProgress) {
             Bool failed;
-            int	result;
             int len = sizeof(result);
 
             WCErrorCode = 0;
@@ -228,7 +230,10 @@ inputHandler(int fd, int mask, void *clientData)
             if (failed)
                 return;
         } else if (cPtr->state == WCConnected) {
-            WMFlushConnection(cPtr);
+            result = WMFlushConnection(cPtr);
+            if (result>0 && cPtr->delegate && cPtr->delegate->canResumeSending) {
+                (*cPtr->delegate->canResumeSending)(cPtr->delegate, cPtr);
+            }
         }
     }
 
@@ -376,6 +381,7 @@ createConnectionWithSocket(int sock, Bool closeOnRelease)
     cPtr->sendTimeout.timeout = DefaultTimeout;
     cPtr->sendTimeout.handler = NULL;
     cPtr->closeOnRelease = closeOnRelease;
+    cPtr->shutdownOnClose = 1;
     cPtr->outputQueue =
         WMCreateArrayWithDestructor(16, (WMFreeDataProc*)WMReleaseData);
     cPtr->state = WCNotConnected;
@@ -412,7 +418,7 @@ WMCreateConnectionWithSocket(int sock, Bool closeOnRelease)
 
     /* some way to find out if it is connected, and binded. can't find
        if it listens though!!!
-    */  
+    */
 
     size = sizeof(clientname);
     n = getpeername(sock, (struct sockaddr*) &clientname, &size);
@@ -627,7 +633,9 @@ void
 WMDestroyConnection(WMConnection *cPtr)
 {
     if (cPtr->closeOnRelease && cPtr->sock>=0) {
-        shutdown(cPtr->sock, SHUT_RDWR);
+        if (cPtr->shutdownOnClose) {
+            shutdown(cPtr->sock, SHUT_RDWR);
+        }
         close(cPtr->sock);
     }
 
@@ -648,7 +656,9 @@ void
 WMCloseConnection(WMConnection *cPtr)
 {
     if (cPtr->sock>=0) {
-        shutdown(cPtr->sock, SHUT_RDWR);
+        if (cPtr->shutdownOnClose) {
+            shutdown(cPtr->sock, SHUT_RDWR);
+        }
         close(cPtr->sock);
         cPtr->sock = -1;
     }
@@ -743,10 +753,18 @@ WMEnqueueConnectionData(WMConnection *cPtr, WMData *data)
 }
 
 
+/*
+ * Return value:
+ * -1 - not connected or connection died while sending
+ *  0 - couldn't send the data (or part of it). data is saved in a queue
+ *      and will be sent when possible. after it is sent the canResumeSending
+ *      callback will be called.
+ *  1 - data was succesfully sent
+ */
 int
 WMSendConnectionData(WMConnection *cPtr, WMData *data)
 {
-    int bytes, pos, len, totalTransfer;
+    int bytes, pos, len;
     TimeoutData *tPtr = &cPtr->sendTimeout;
     const unsigned char *dataBytes;
 
@@ -767,8 +785,6 @@ WMSendConnectionData(WMConnection *cPtr, WMData *data)
             return 0;
     }
 
-    totalTransfer = 0;
-
     while (WMGetArrayItemCount(cPtr->outputQueue) > 0) {
         data = WMGetFromArray(cPtr->outputQueue, 0);
         dataBytes = (const unsigned char *)WMDataBytes(data);
@@ -793,7 +809,7 @@ WMSendConnectionData(WMConnection *cPtr, WMData *data)
                             WMAddInputHandler(cPtr->sock, WIWriteMask,
                                               inputHandler, cPtr);
                     }
-                    return totalTransfer;
+                    return 0;
                 default:
                     WCErrorCode = errno;
                     cPtr->state = WCDied;
@@ -804,7 +820,6 @@ WMSendConnectionData(WMConnection *cPtr, WMData *data)
                 }
             }
             pos += bytes;
-            totalTransfer += bytes;
         }
         WMDeleteFromArray(cPtr->outputQueue, 0);
         cPtr->bufPos = 0;
@@ -812,13 +827,18 @@ WMSendConnectionData(WMConnection *cPtr, WMData *data)
             WMDeleteTimerHandler(tPtr->handler);
             tPtr->handler = NULL;
         }
-        if (cPtr->handler.write) {
+        /*if (cPtr->handler.write) {
             WMDeleteInputHandler(cPtr->handler.write);
             cPtr->handler.write = NULL;
-        }
+        }*/
     }
 
-    return totalTransfer;
+    if (cPtr->handler.write) {
+        WMDeleteInputHandler(cPtr->handler.write);
+        cPtr->handler.write = NULL;
+    }
+
+    return 1;
 }
 
 
@@ -952,6 +972,13 @@ WMSetConnectionCloseOnExec(WMConnection *cPtr, Bool flag)
 }
 
 
+void
+WMSetConnectionShutdownOnClose(WMConnection *cPtr, Bool flag)
+{
+    cPtr->shutdownOnClose = ((flag==0) ? 0 : 1);
+}
+
+
 void*
 WMGetConnectionClientData(WMConnection *cPtr)
 {

WINGs/handlers.c

@@ -603,7 +603,6 @@ W_HandleInputEvents(Bool waitForInput, int inputfd)
 
     W_FlushASAPNotificationQueue();
 
-    /* --oldway-- return ((inputfd < 0) ? (count > 0) : FD_ISSET(inputfd, &rset));*/
     return (count > 0);
 #else /* not HAVE_SELECT, not HAVE_POLL */
     Neither select nor poll. You lose.

WINGs/wutil.c

@@ -14,7 +14,7 @@ WHandleEvents()
     W_CheckTimerHandlers();
 
     /* Do idle and timer stuff while there are no input events */
-    /* Do not wait for input here. just peek to se if input is available */
+    /* Do not wait for input here. just peek to see if input is available */
     while (!W_HandleInputEvents(False, -1) && W_CheckIdleHandlers()) {
         /* dispatch timer events */
         W_CheckTimerHandlers();

configure.ac

@@ -15,7 +15,7 @@ AC_INIT(src/WindowMaker.h)
 
 
 
-AM_INIT_AUTOMAKE(WindowMaker, 0.80.1)
+AM_INIT_AUTOMAKE(WindowMaker, 0.80.2)
 
 AC_PROG_LIBTOOL
 
@@ -100,7 +100,7 @@ dnl not used anywhere
 dnl AC_FUNC_MEMCMP  
 AC_FUNC_VPRINTF
 AC_FUNC_ALLOCA
-AC_CHECK_FUNCS(gethostname select poll strerror strcasecmp strncasecmp setpgid atexit mallinfo mkstemp snprintf vsnprintf asprintf vasprintf)
+AC_CHECK_FUNCS(gethostname select poll strerror strcasecmp strncasecmp setsid atexit mallinfo mkstemp snprintf vsnprintf asprintf vasprintf)
 
 
 dnl ripped from samba

src/dock.c

@@ -2979,8 +2979,8 @@ execCommand(WAppIcon *btn, char *command, WSavedState *state)
 
 	SetupEnvironment(scr);
 
-#ifdef HAVE_SETPGID
-        setpgid(0, 0);
+#ifdef HAVE_SETSID
+        setsid();
 #endif
 
 	args = malloc(sizeof(char*)*(argc+1));

src/main.c

@@ -307,8 +307,8 @@ ExecuteShellCommand(WScreen *scr, char *command)
 
 	SetupEnvironment(scr);
 
-#ifdef HAVE_SETPGID
-	setpgid(0, 0);
+#ifdef HAVE_SETSID
+        setsid();
 #endif
 	execl(shell, shell, "-c", command, NULL);
 	wsyserror("could not execute %s -c %s", shell, command);