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authorMihai Moldovan <ionic@ionic.de>2017-07-26 10:38:46 +0200
committerMihai Moldovan <ionic@ionic.de>2017-07-26 10:38:46 +0200
commit7897834ce578dc394649ed09acb9f95fc04915ff (patch)
treea0bcbfa2c4ae1111ad3d49390c7abd0ae3a9a2ed /nxcomp/src/Fork.cpp
parent9193d11eeeea933e293acd5e0f03fa4e9887186b (diff)
parent4afc641fdd8c03bd708f50e0c3691b5de7ea1dba (diff)
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Merge branch 'sunweaver-pr/nxcomp-autoreconf' into 3.6.x
Attributes GH PR #480: https://github.com/ArcticaProject/nx-libs/pull/480
Diffstat (limited to 'nxcomp/src/Fork.cpp')
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1 files changed, 110 insertions, 0 deletions
diff --git a/nxcomp/src/Fork.cpp b/nxcomp/src/Fork.cpp
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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()
+{
+ #ifdef __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;
+}