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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) */
/* Copyright (c) 2008-2014 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de> */
/* Copyright (c) 2014-2016 Ulrich Sibiller <uli42@gmx.de> */
/* Copyright (c) 2014-2016 Mihai Moldovan <ionic@ionic.de> */
/* Copyright (c) 2011-2016 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of the aforementioned persons and companies. */
/* */
/* Redistribution and use of the present software is allowed according */
/* to terms specified in the file LICENSE.nxcomp which comes in the */
/* source distribution. */
/* */
/* All rights reserved. */
/* */
/* NOTE: This software has received contributions from various other */
/* contributors, only the core maintainers and supporters are listed as */
/* copyright holders. Please contact us, if you feel you should be listed */
/* as copyright holder, as well. */
/* */
/**************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <unistd.h>
#include "Fork.h"
#include "Misc.h"
#include "Timestamp.h"
//
// Set the verbosity level.
//
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
//
// Only on Cygwin, retry n times waiting a
// given amount of milliseconds after each
// attempt.
//
#define RETRY_LIMIT 30
#define RETRY_TIMEOUT 1000
int Fork()
{
#if defined(__CYGWIN__) || defined(__CYGWIN32__)
int limit = RETRY_LIMIT;
int timeout = RETRY_TIMEOUT;
#else
int limit = 1;
int timeout = 0;
#endif
int pid = 0;
for (int i = 0; i < limit; i++)
{
#ifdef TEST
*logofs << "Fork: Trying at " << strMsTimestamp()
<< ".\n" << logofs_flush;
#endif
//
// It could optionally try again only if the
// error code is 11, 'Resource temporarily
// unavailable'.
//
if ((pid = fork()) >= 0)
{
break;
}
else if (i < limit - 1)
{
#ifdef WARNING
*logofs << "Fork: WARNING! Function fork failed. "
<< "Error is " << EGET() << " '" << ESTR()
<< "'. Retrying...\n" << logofs_flush;
#endif
usleep(timeout * 1000);
}
}
#ifdef TEST
if (pid <= 0)
{
*logofs << "Fork: Returning at " << strMsTimestamp()
<< ".\n" << logofs_flush;
}
#endif
return pid;
}
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