Fix kompmgr configuration dialog

All main settings now work and apply immediately
There is also now no flicker during settings application!


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1247196 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

3 files changed, 194 insertions, 51 deletions

diff --git a/kwin/kcmkwin/kwinoptions/windows.cpp b/kwin/kcmkwin/kwinoptions/windows.cpp
index 9e81bc053..f3de197d5 100644
--- a/kwin/kcmkwin/kwinoptions/windows.cpp
+++ b/kwin/kcmkwin/kwinoptions/windows.cpp
@@ -1491,6 +1491,7 @@ KTranslucencyConfig::KTranslucencyConfig (bool _standAlone, KConfig *_config, TQ
   connect(shadowTopOffset, TQT_SIGNAL(valueChanged(int)), TQT_SLOT(resetKompmgr()));
   connect(shadowLeftOffset, TQT_SIGNAL(valueChanged(int)), TQT_SLOT(resetKompmgr()));
   connect(shadowColor, TQT_SIGNAL(changed(const TQColor&)), TQT_SLOT(resetKompmgr()));
+  connect(fadeInWindows, TQT_SIGNAL(toggled(bool)), TQT_SLOT(resetKompmgr()));
   connect(fadeInMenuWindows, TQT_SIGNAL(toggled(bool)), TQT_SLOT(resetKompmgr()));
   connect(fadeOnOpacityChange, TQT_SIGNAL(toggled(bool)), TQT_SLOT(resetKompmgr()));
   connect(fadeInSpeed, TQT_SIGNAL(valueChanged(int)), TQT_SLOT(resetKompmgr()));
@@ -1695,8 +1696,7 @@ void KTranslucencyConfig::startKompmgr()
     bool ret;
     KProcess proc;
     proc << "kompmgr";
-    ret = proc.start(KProcess::DontCare, KProcess::AllOutput);
-    proc.detach();
+    ret = proc.start(KProcess::DontCare);
 }
 
 void KTranslucencyConfig::showWarning(bool alphaActivated)
diff --git a/kwin/kompmgr/kompmgr.c b/kwin/kompmgr/kompmgr.c
index ceea0ac30..910622d73 100644
--- a/kwin/kompmgr/kompmgr.c
+++ b/kwin/kompmgr/kompmgr.c
@@ -34,8 +34,10 @@
  * CHANGELOG:
  * http://patchwork.freedesktop.org/patch/1049/	[Add default background color option]		08/11/2011
  * http://patchwork.freedesktop.org/patch/1052/ [Prevent flicker on root pixmap change]		08/11/2011
- * Added SIGUSER1 handler to change process UID	[Prevent flicker on login]			08/12/2011
+ * Added SIGUSR1 handler to change process UID	[Prevent flicker on login]			08/12/2011
  * Added ability to write PID of process to home directory					08/14/2011
+ * Added SIGUSR2 handler to reload settings     [Prevent flicker on settings change]		08/14/2011
+ * Added SIGTERM handler to clean up stale PID files on exit					08/14/2011
  *
  * TODO:
  * http://patchwork.freedesktop.org/patch/1053/ [Fix window mapping with re-used window ids]
@@ -76,7 +78,7 @@ check baghira.sf.net for more infos
 #define _LEFTWIDTH_(x) (x & 0xff)
 
 /* #define USE_ENV_HOME 1 */
-/* #define WRITE_PID_FILE 1 */
+#define WRITE_PID_FILE 1
 
 #ifndef USE_ENV_HOME
 #include <pwd.h>
@@ -297,7 +299,7 @@ void write_pid_file(pid_t pid)
         home = getenv("HOME");
 #endif
     const char *filename;
-    const char *configfile = "/.kompmgr.pid"; 
+    const char *configfile = "/.kompmgr.pid";
     int n = strlen(home)+strlen(configfile)+1;
     filename = (char*)malloc(n*sizeof(char));
     memset(filename,0,n);
@@ -311,8 +313,10 @@ void write_pid_file(pid_t pid)
     char buffer[255];
     sprintf(buffer, "%d", pid);
     pFile = fopen(filename, "w");
-    fwrite(buffer,1,strlen(buffer), pFile);
-    fclose(pFile);
+    if (pFile) {
+        fwrite(buffer,1,strlen(buffer), pFile);
+        fclose(pFile);
+    }
 
     free(filename);
     filename = NULL;
@@ -353,46 +357,59 @@ void delete_pid_file()
 
 void handle_siguser (int sig)
 {
-    char newuid[1024];
+    int uidnum;
+    if (sig == SIGTERM) {
+        delete_pid_file();
+        exit(0);
+        return;
+    }
+    if (sig == SIGUSR1) {
+        char newuid[1024];
 #ifndef NDEBUG
-    printf("Enter the new user ID:\n\r"); fflush(stdout);
+        printf("Enter the new user ID:\n\r"); fflush(stdout);
 #endif
-    char *eof;
-    newuid[0] = '\0';
-    newuid[sizeof(newuid)-1] = '\0';
-    eof = fgets(newuid, sizeof(newuid), stdin);
-    int uidnum = atoi(newuid);
+        char *eof;
+        newuid[0] = '\0';
+        newuid[sizeof(newuid)-1] = '\0';
+        eof = fgets(newuid, sizeof(newuid), stdin);
+        uidnum = atoi(newuid);
 #ifndef NDEBUG
-    printf("Setting kompmgr process uid to %d...\n\r", uidnum); fflush(stdout);
+        printf("Setting kompmgr process uid to %d...\n\r", uidnum); fflush(stdout);
 #endif
 
-    delete_pid_file();
-    setuid(uidnum);
-    write_pid_file(getpid());
+        delete_pid_file();
+        setuid(uidnum);
+        write_pid_file(getpid());
 
+    }
+    else {
+        uidnum = getuid();
+    }
+    if ((sig == SIGUSR1) || (sig == SIGUSR2)) {
 #ifdef USE_ENV_HOME
-    const char *home = getenv("HOME");
+        const char *home = getenv("HOME");
 #else
-    const char *home;
-    struct passwd *p;
-    p = getpwuid(uidnum);
-    if (p)
-        home = p->pw_dir;
-    else
-        home = getenv("HOME");
+        const char *home;
+        struct passwd *p;
+        p = getpwuid(uidnum);
+        if (p)
+            home = p->pw_dir;
+        else
+            home = getenv("HOME");
 #endif
-    const char *filename;
-    const char *configfile = "/.xcompmgrrc"; 
-    int n = strlen(home)+strlen(configfile)+1;
-    filename = (char*)malloc(n*sizeof(char));
-    memset(filename,0,n);
-    strcat(filename, home);
-    strcat(filename, configfile);
-
-    loadConfig(filename); /* reload the configuration file */
-
-    free(filename);
-    filename = NULL;
+        const char *filename;
+        const char *configfile = "/.xcompmgrrc";
+        int n = strlen(home)+strlen(configfile)+1;
+        filename = (char*)malloc(n*sizeof(char));
+        memset(filename,0,n);
+        strcat(filename, home);
+        strcat(filename, configfile);
+
+        loadConfig(filename); /* reload the configuration file */
+
+        free(filename);
+        filename = NULL;
+    }
 }
 
 fade *
@@ -2712,9 +2729,8 @@ main (int argc, char **argv)
 	usr_action.sa_mask = block_mask;
 	usr_action.sa_flags = 0;
 	sigaction(SIGUSR1, &usr_action, NULL);
-
-	// atexit(delete_pid_file);	// [FIXME] For some reason this gets confused and deletes the file early
-	write_pid_file(getpid());
+        sigaction(SIGUSR2, &usr_action, NULL);
+        sigaction(SIGTERM, &usr_action, NULL);
 
 	loadConfig(NULL); /*we do that before cmdline-parsing, so config-values can be overridden*/
 	/*used for shadow colors*/
@@ -2931,6 +2947,11 @@ main (int argc, char **argv)
 	ufd.events = POLLIN;
 	if (!autoRedirect)
 		paint_all (dpy, None);
+
+        /* Under no circumstances should these two lines EVER be moved earlier in main() than this point */
+        atexit(delete_pid_file);
+        write_pid_file(getpid());
+
 	for (;;)
 	{
 		/*	dump_wins (); */
diff --git a/kwin/workspace.cpp b/kwin/workspace.cpp
index 4d3199a18..77e22af6f 100644
--- a/kwin/workspace.cpp
+++ b/kwin/workspace.cpp
@@ -45,6 +45,8 @@ License. See the file "COPYING" for the exact licensing terms.
 #include <X11/keysymdef.h>
 #include <X11/cursorfont.h>
 
+#include <pwd.h>
+
 namespace KWinInternal
 {
 
@@ -221,6 +223,57 @@ Workspace::Workspace( bool restore )
         *kompmgr << "kompmgr";
         startKompmgr();
         }
+    else
+        {
+        // If kompmgr is already running, send it SIGTERM
+        // Attempt to load the kompmgr pid file
+        const char *home;
+        struct passwd *p;
+        p = getpwuid(getuid());
+        if (p)
+            home = p->pw_dir;
+        else
+            home = getenv("HOME");
+        char *filename;
+        const char *configfile = "/.kompmgr.pid";
+        int n = strlen(home)+strlen(configfile)+1;
+        filename = (char*)malloc(n*sizeof(char));
+        memset(filename,0,n);
+        strcat(filename, home);
+        strcat(filename, configfile);
+
+        printf("reading '%s' as kompmgr pidfile\n\n", filename);
+
+        // Now that we did all that by way of introduction...read the file!
+        FILE *pFile;
+        char buffer[255];
+        pFile = fopen(filename, "r");
+        int kompmgrpid = 0;
+        if (pFile)
+            {
+            // obtain file size
+            fseek (pFile , 0 , SEEK_END);
+            unsigned long lSize = ftell (pFile);
+            if (lSize > 254)
+                lSize = 254;
+            rewind (pFile);
+            size_t result = fread (buffer, 1, lSize, pFile);
+            fclose(pFile);
+            kompmgrpid = atoi(buffer);
+            }
+
+        free(filename);
+        filename = NULL;
+
+        if (kompmgrpid)
+                {
+                kill(kompmgrpid, SIGTERM);
+                }
+            else
+                {
+                stopKompmgr();
+                }
+        }
     }
 
 
@@ -1023,9 +1076,70 @@ void Workspace::slotReconfigure()
     if (options->resetKompmgr) // need restart
         {
         bool tmp = options->useTranslucency;
-        stopKompmgr();
+
+        // If kompmgr is already running, sending SIGUSR2 will force a reload of its settings
+        // Attempt to load the kompmgr pid file
+        const char *home;
+        struct passwd *p;
+        p = getpwuid(getuid());
+        if (p)
+            home = p->pw_dir;
+        else
+            home = getenv("HOME");
+        char *filename;
+        const char *configfile = "/.kompmgr.pid";
+        int n = strlen(home)+strlen(configfile)+1;
+        filename = (char*)malloc(n*sizeof(char));
+        memset(filename,0,n);
+        strcat(filename, home);
+        strcat(filename, configfile);
+
+        printf("reading '%s' as kompmgr pidfile\n\n", filename);
+
+        // Now that we did all that by way of introduction...read the file!
+        FILE *pFile;
+        char buffer[255];
+        pFile = fopen(filename, "r");
+        int kompmgrpid = 0;
+        if (pFile)
+            {
+            // obtain file size
+            fseek (pFile , 0 , SEEK_END);
+            unsigned long lSize = ftell (pFile);
+            if (lSize > 254)
+                lSize = 254;
+            rewind (pFile);
+            size_t result = fread (buffer, 1, lSize, pFile);
+            fclose(pFile);
+            kompmgrpid = atoi(buffer);
+            }
+
+        free(filename);
+        filename = NULL;
+
         if (tmp)
-            TQTimer::singleShot( 200, this, TQT_SLOT(startKompmgr()) ); // wait some time to ensure system's ready for restart
+            {
+            if (kompmgrpid)
+                {
+                kill(kompmgrpid, SIGUSR2);
+                }
+            else
+                {
+                stopKompmgr();
+                TQTimer::singleShot( 200, this, TQT_SLOT(startKompmgr()) ); // wait some time to ensure system's ready for restart
+                }
+            }
+        else
+            {
+            if (kompmgrpid)
+                {
+                kill(kompmgrpid, SIGTERM);
+                }
+            else
+                {
+                stopKompmgr();
+                }
+            }
         }
     }
 
@@ -2620,8 +2734,9 @@ void Workspace::startKompmgr()
 
 void Workspace::stopKompmgr()
 {
-    if (!kompmgr  || !kompmgr->isRunning())
+    if (!kompmgr || !kompmgr->isRunning()) {
         return;
+    }
     delete kompmgr_selection;
     kompmgr_selection = NULL;
     kompmgr->disconnect(this, TQT_SLOT(restartKompmgr()));
@@ -2647,21 +2762,28 @@ void Workspace::unblockKompmgrRestart()
 void Workspace::restartKompmgr( KProcess *proc )
 // this is for inernal purpose (crashhandling) only, usually you want to use workspace->stopKompmgr(); TQTimer::singleShot(200, workspace, TQT_SLOT(startKompmgr()));
 {
+    bool crashed;
     if (proc->signalled()) {	// looks like kompmgr may have crashed
       int exit_signal_number = proc->exitSignal();
       if ( (exit_signal_number == SIGILL) || (exit_signal_number == SIGTRAP) || (exit_signal_number == SIGABRT) || (exit_signal_number == SIGSYS) || (exit_signal_number == SIGFPE) || (exit_signal_number == SIGBUS) || (exit_signal_number == SIGSEGV) ) {
-        if (!allowKompmgrRestart)   // uh oh, it crashed recently already
-        {
-            delete kompmgr_selection;
-            kompmgr_selection = NULL;
-            options->useTranslucency = FALSE;
+        crashed = true;
+      }
+      else {
+        crashed = false;
+      }
+      if (!allowKompmgrRestart)   // uh oh, it exited recently already
+      {
+          delete kompmgr_selection;
+          kompmgr_selection = NULL;
+          options->useTranslucency = FALSE;
+          if (crashed) {
             KProcess proc;
             proc << "kdialog" << "--error"
                 << i18n( "The Composite Manager crashed twice within a minute and is therefore disabled for this session.")
                 << "--title" << i18n("Composite Manager Failure");
             proc.start(KProcess::DontCare);
-            return;
-        }
+          }
+          return;
       }
       if (!kompmgr)
             return;