Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.

BUG:215923


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdelibs@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

1 files changed, 277 insertions, 0 deletions

diff --git a/kdecore/kprocctrl.cpp b/kdecore/kprocctrl.cpp
new file mode 100644
index 000000000..363d2d8ef
--- /dev/null
+++ b/kdecore/kprocctrl.cpp
@@ -0,0 +1,277 @@
+/* This file is part of the KDE libraries
+    Copyright (C) 1997 Christian Czezakte (e9025461@student.tuwien.ac.at)
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "kprocess.h"
+#include "kprocctrl.h"
+
+#include <config.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <qsocketnotifier.h>
+
+KProcessController *KProcessController::theKProcessController;
+int KProcessController::refCount;
+
+void KProcessController::ref()
+{
+  if( !refCount ) {
+    theKProcessController = new KProcessController;
+    setupHandlers();
+  }
+  refCount++;
+}
+
+void KProcessController::deref()
+{
+  refCount--;
+  if( !refCount ) {
+    resetHandlers();
+    delete theKProcessController;
+    theKProcessController = 0;
+  }
+}
+
+KProcessController::KProcessController()
+  : needcheck( false )
+{
+  if( pipe( fd ) )
+  {
+    perror( "pipe" );
+    abort();
+  }
+
+  fcntl( fd[0], F_SETFL, O_NONBLOCK ); // in case slotDoHousekeeping is called without polling first
+  fcntl( fd[1], F_SETFL, O_NONBLOCK ); // in case it fills up
+  fcntl( fd[0], F_SETFD, FD_CLOEXEC );
+  fcntl( fd[1], F_SETFD, FD_CLOEXEC );
+
+  notifier = new QSocketNotifier( fd[0], QSocketNotifier::Read );
+  notifier->setEnabled( true );
+  QObject::connect( notifier, SIGNAL(activated(int)),
+                    SLOT(slotDoHousekeeping()));
+}
+
+KProcessController::~KProcessController()
+{
+  delete notifier;
+
+  close( fd[0] );
+  close( fd[1] );
+}
+
+
+extern "C" {
+static void theReaper( int num )
+{
+  KProcessController::theSigCHLDHandler( num );
+}
+}
+
+#ifdef Q_OS_UNIX
+struct sigaction KProcessController::oldChildHandlerData;
+#endif
+bool KProcessController::handlerSet = false;
+
+void KProcessController::setupHandlers()
+{
+  if( handlerSet )
+      return;
+  handlerSet = true;
+
+#ifdef Q_OS_UNIX
+  struct sigaction act;
+  sigemptyset( &act.sa_mask );
+
+  act.sa_handler = SIG_IGN;
+  act.sa_flags = 0;
+  sigaction( SIGPIPE, &act, 0L );
+
+  act.sa_handler = theReaper;
+  act.sa_flags = SA_NOCLDSTOP;
+  // CC: take care of SunOS which automatically restarts interrupted system
+  // calls (and thus does not have SA_RESTART)
+#ifdef SA_RESTART
+  act.sa_flags |= SA_RESTART;
+#endif
+  sigaction( SIGCHLD, &act, &oldChildHandlerData );
+
+  sigaddset( &act.sa_mask, SIGCHLD );
+  // Make sure we don't block this signal. gdb tends to do that :-(
+  sigprocmask( SIG_UNBLOCK, &act.sa_mask, 0 );
+#else
+  //TODO: win32
+#endif
+}
+
+void KProcessController::resetHandlers()
+{
+  if( !handlerSet )
+      return;
+  handlerSet = false;
+
+#ifdef Q_OS_UNIX
+  sigaction( SIGCHLD, &oldChildHandlerData, 0 );
+#else
+  //TODO: win32
+#endif
+  // there should be no problem with SIGPIPE staying SIG_IGN
+}
+
+// the pipe is needed to sync the child reaping with our event processing,
+// as otherwise there are race conditions, locking requirements, and things
+// generally get harder
+void KProcessController::theSigCHLDHandler( int arg )
+{
+  int saved_errno = errno;
+
+  char dummy = 0;
+  ::write( theKProcessController->fd[1], &dummy, 1 );
+
+#ifdef Q_OS_UNIX
+  if( oldChildHandlerData.sa_handler != SIG_IGN &&
+      oldChildHandlerData.sa_handler != SIG_DFL )
+     oldChildHandlerData.sa_handler( arg ); // call the old handler
+#else
+  //TODO: win32
+#endif
+
+  errno = saved_errno;
+}
+
+int KProcessController::notifierFd() const
+{
+  return fd[0];
+}
+
+void KProcessController::unscheduleCheck()
+{
+  char dummy[16]; // somewhat bigger - just in case several have queued up
+  if( ::read( fd[0], dummy, sizeof(dummy) ) > 0 )
+    needcheck = true;
+}
+
+void
+KProcessController::rescheduleCheck()
+{
+  if( needcheck )
+  {
+    needcheck = false;
+    char dummy = 0;
+    ::write( fd[1], &dummy, 1 );
+  }
+}
+
+void KProcessController::slotDoHousekeeping()
+{
+  char dummy[16]; // somewhat bigger - just in case several have queued up
+  ::read( fd[0], dummy, sizeof(dummy) );
+
+  int status;
+ again:
+  QValueListIterator<KProcess*> it( kProcessList.begin() );
+  QValueListIterator<KProcess*> eit( kProcessList.end() );
+  while( it != eit )
+  {
+    KProcess *prc = *it;
+    if( prc->runs && waitpid( prc->pid_, &status, WNOHANG ) > 0 )
+    {
+      prc->processHasExited( status );
+      // the callback can nuke the whole process list and even 'this'
+      if (!theKProcessController)
+        return;
+      goto again;
+    }
+    ++it;
+  }
+  QValueListIterator<int> uit( unixProcessList.begin() );
+  QValueListIterator<int> ueit( unixProcessList.end() );
+  while( uit != ueit )
+  {
+    if( waitpid( *uit, 0, WNOHANG ) > 0 )
+    {
+      uit = unixProcessList.remove( uit );
+      deref(); // counterpart to addProcess, can invalidate 'this'
+    } else
+      ++uit;
+  }
+}
+
+bool KProcessController::waitForProcessExit( int timeout )
+{
+#ifdef Q_OS_UNIX
+  for(;;)
+  {
+    struct timeval tv, *tvp;
+    if (timeout < 0)
+      tvp = 0;
+    else
+    {
+      tv.tv_sec = timeout;
+      tv.tv_usec = 0;
+      tvp = &tv;
+    }
+
+    fd_set fds;
+    FD_ZERO( &fds );
+    FD_SET( fd[0], &fds );
+
+    switch( select( fd[0]+1, &fds, 0, 0, tvp ) )
+    {
+    case -1:
+      if( errno == EINTR )
+        continue;
+      // fall through; should never happen
+    case 0:
+      return false;
+    default:
+      slotDoHousekeeping();
+      return true;
+    }
+  }
+#else
+  //TODO: win32
+  return false;
+#endif
+}
+
+void KProcessController::addKProcess( KProcess* p )
+{
+  kProcessList.append( p );
+}
+
+void KProcessController::removeKProcess( KProcess* p )
+{
+  kProcessList.remove( p );
+}
+
+void KProcessController::addProcess( int pid )
+{
+  unixProcessList.append( pid );
+  ref(); // make sure we stay around when the KProcess goes away
+}
+
+#include "kprocctrl.moc"