Merge branch 'sunweaver-pr/nxcomp-autoreconf' into 3.6.x

Attributes GH PR #480: https://github.com/ArcticaProject/nx-libs/pull/480

1 files changed, 110 insertions, 0 deletions

diff --git a/nxcomp/src/Fork.cpp b/nxcomp/src/Fork.cpp
new file mode 100644
index 000000000..657c36134
--- /dev/null
+++ b/nxcomp/src/Fork.cpp
@@ -0,0 +1,110 @@
+/**************************************************************************/
+/*                                                                        */
+/* 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;
+}