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-rw-r--r--microkde/oprocctrl.cpp285
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diff --git a/microkde/oprocctrl.cpp b/microkde/oprocctrl.cpp
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--- a/microkde/oprocctrl.cpp
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-/* 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
-*/
-//
-// KPROCESSCONTROLLER -- A helper class for KProcess
-//
-// version 0.3.1, Jan, 8th 1997
-//
-// (C) Christian Czezatke
-// e9025461@student.tuwien.ac.at
-// Ported by Holger Freyther
-//
-
-//#include <config.h>
-
-#include <sys/types.h>
-#include <sys/socket.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <string.h>
-#include <unistd.h>
-#include <assert.h>
-
-#include <qsocketnotifier.h>
-#include "oprocctrl.h"
-
-using namespace Opie::Core::Internal;
-
-OProcessController *OProcessController::theOProcessController = 0;
-
-struct sigaction OProcessController::oldChildHandlerData;
-bool OProcessController::handlerSet = false;
-
-OProcessController::OProcessController()
-{
- assert( theOProcessController == 0 );
-
- if (0 > pipe(fd))
- printf(strerror(errno));
-
- notifier = new QSocketNotifier(fd[0], QSocketNotifier::Read);
- notifier->setEnabled(true);
- QObject::connect(notifier, SIGNAL(activated(int)),
- this, SLOT(slotDoHousekeeping(int)));
- connect( &delayedChildrenCleanupTimer, SIGNAL( timeout()),
- SLOT( delayedChildrenCleanup()));
-
- theOProcessController = this;
-
- setupHandlers();
-}
-
-
-void OProcessController::setupHandlers()
-{
- if( handlerSet )
- return;
- struct sigaction act;
- act.sa_handler=theSigCHLDHandler;
- sigemptyset(&(act.sa_mask));
- 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);
-
- 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 );
-
- act.sa_handler=SIG_IGN;
- sigemptyset(&(act.sa_mask));
- sigaddset(&(act.sa_mask), SIGPIPE);
- act.sa_flags = 0;
- sigaction( SIGPIPE, &act, 0L);
- handlerSet = true;
-}
-
-void OProcessController::resetHandlers()
-{
- if( !handlerSet )
- return;
- sigaction( SIGCHLD, &oldChildHandlerData, 0 );
- // there should be no problem with SIGPIPE staying SIG_IGN
- handlerSet = false;
-}
-
-// block SIGCHLD handler, because it accesses processList
-void OProcessController::addOProcess( OProcess* p )
-{
- sigset_t newset, oldset;
- sigemptyset( &newset );
- sigaddset( &newset, SIGCHLD );
- sigprocmask( SIG_BLOCK, &newset, &oldset );
- processList.append( p );
- sigprocmask( SIG_SETMASK, &oldset, 0 );
-}
-
-void OProcessController::removeOProcess( OProcess* p )
-{
- sigset_t newset, oldset;
- sigemptyset( &newset );
- sigaddset( &newset, SIGCHLD );
- sigprocmask( SIG_BLOCK, &newset, &oldset );
- processList.remove( p );
- sigprocmask( SIG_SETMASK, &oldset, 0 );
-}
-
-//using a struct which contains both the pid and the status makes it easier to write
-//and read the data into the pipe
-//especially this solves a problem which appeared on my box where slotDoHouseKeeping() received
-//only 4 bytes (with some debug output around the write()'s it received all 8 bytes)
-//don't know why this happened, but when writing all 8 bytes at once it works here, aleXXX
-struct waitdata
-{
- pid_t pid;
- int status;
-};
-
-void OProcessController::theSigCHLDHandler(int arg)
-{
- struct waitdata wd;
- // int status;
- // pid_t this_pid;
- int saved_errno;
-
- saved_errno = errno;
- // since waitpid and write change errno, we have to save it and restore it
- // (Richard Stevens, Advanced programming in the Unix Environment)
-
- bool found = false;
- if( theOProcessController != 0 )
- {
- // iterating the list doesn't perform any system call
- for( QValueList<OProcess*>::ConstIterator it = theOProcessController->processList.begin();
- it != theOProcessController->processList.end();
- ++it )
- {
- if( !(*it)->isRunning())
- continue;
- wd.pid = waitpid( (*it)->pid(), &wd.status, WNOHANG );
- if ( wd.pid > 0 )
- {
- ::write(theOProcessController->fd[1], &wd, sizeof(wd));
- found = true;
- }
- }
- }
- if( !found && oldChildHandlerData.sa_handler != SIG_IGN
- && oldChildHandlerData.sa_handler != SIG_DFL )
- oldChildHandlerData.sa_handler( arg ); // call the old handler
- // handle the rest
- if( theOProcessController != 0 )
- {
- static const struct waitdata dwd = { 0, 0 }
- ; // delayed waitpid()
- ::write(theOProcessController->fd[1], &dwd, sizeof(dwd));
- }
- else
- {
- int dummy;
- while( waitpid( -1, &dummy, WNOHANG ) > 0 )
- ;
- }
-
- errno = saved_errno;
-}
-
-
-
-void OProcessController::slotDoHousekeeping(int )
-{
- unsigned int bytes_read = 0;
- unsigned int errcnt=0;
- // read pid and status from the pipe.
- struct waitdata wd;
- while ((bytes_read < sizeof(wd)) && (errcnt < 50))
- {
- int r = ::read(fd[0], ((char *)&wd) + bytes_read, sizeof(wd) - bytes_read);
- if (r > 0) bytes_read += r;
- else if (r < 0) errcnt++;
- }
- if (errcnt >= 50)
- {
- fprintf(stderr,
- "Error: Max. error count for pipe read "
- "exceeded in OProcessController::slotDoHousekeeping\n");
- return; // it makes no sense to continue here!
- }
- if (bytes_read != sizeof(wd))
- {
- fprintf(stderr,
- "Error: Could not read info from signal handler %d <> %d!\n",
- bytes_read, sizeof(wd));
- return; // it makes no sense to continue here!
- }
- if (wd.pid==0)
- { // special case, see delayedChildrenCleanup()
- delayedChildrenCleanupTimer.start( 1000, true );
- return;
- }
-
- for( QValueList<OProcess*>::ConstIterator it = processList.begin();
- it != processList.end();
- ++it )
- {
- OProcess* proc = *it;
- if (proc->pid() == wd.pid)
- {
- // process has exited, so do emit the respective events
- if (proc->run_mode == OProcess::Block)
- {
- // If the reads are done blocking then set the status in proc
- // but do nothing else because OProcess will perform the other
- // actions of processHasExited.
- proc->status = wd.status;
- proc->runs = false;
- }
- else
- {
- proc->processHasExited(wd.status);
- }
- return;
- }
- }
-}
-
-// this is needed e.g. for popen(), which calls waitpid() checking
-// for its forked child, if we did waitpid() directly in the SIGCHLD
-// handler, popen()'s waitpid() call would fail
-void OProcessController::delayedChildrenCleanup()
-{
- struct waitdata wd;
- while(( wd.pid = waitpid( -1, &wd.status, WNOHANG ) ) > 0 )
- {
- for( QValueList<OProcess*>::ConstIterator it = processList.begin();
- it != processList.end();
- ++it )
- {
- if( !(*it)->isRunning() || (*it)->pid() != wd.pid )
- continue;
- // it's OProcess, handle it
- ::write(fd[1], &wd, sizeof(wd));
- break;
- }
- }
-}
-
-OProcessController::~OProcessController()
-{
- assert( theOProcessController == this );
- resetHandlers();
-
- notifier->setEnabled(false);
-
- close(fd[0]);
- close(fd[1]);
-
- delete notifier;
- theOProcessController = 0;
-}
-
-//#include "kprocctrl.moc"