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authorMike Gabriel <mike.gabriel@das-netzwerkteam.de>2011-11-19 15:59:16 +0100
committerMike Gabriel <mike.gabriel@das-netzwerkteam.de>2011-11-19 15:59:16 +0100
commita48361b11a5abb5a345dac5ec83a8f56c4d50b74 (patch)
treea16fb870a072450bb45ee09ac4df9887bfa7f98e /nxcomp/Fork.cpp
parent9997e13bb583de4012914006c7507839a4e11227 (diff)
parent232dfc41d41390bfffa75ec2ed065c109fa03a0e (diff)
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Merge branch 'nxcomp'
Diffstat (limited to 'nxcomp/Fork.cpp')
-rw-r--r--nxcomp/Fork.cpp98
1 files changed, 98 insertions, 0 deletions
diff --git a/nxcomp/Fork.cpp b/nxcomp/Fork.cpp
new file mode 100644
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--- /dev/null
+++ b/nxcomp/Fork.cpp
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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2010 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of Medialogic S.p.A. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#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;
+}