From 8e7328b6e0cc88f98dc25570d244833add8c296b Mon Sep 17 00:00:00 2001
From: tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 2 Aug 2000 21:54:04 +0000
Subject: 	* Makefile.in: Rebuilt. 	* Makefile.am
 (libgcj_la_SOURCES): Added posix.cc. 	* java/net/natPlainSocketImpl.cc:
 Include posix.h. 	(accept): Use _Jv_select. 	*
 java/net/natPlainDatagramSocketImpl.cc: Include posix.h. 	(receive): Use
 _Jv_select. 	* java/io/natFileDescriptorPosix.cc: Include posix.h. 
 (available): Use _Jv_select. 	* java/lang/natSystem.cc: Include posix.h. 
 (currentTimeMillis): Use _Jv_gettimeofday. 	* include/posix.h: New file. 
 * posix.cc: New file.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@35435 138bc75d-0d04-0410-961f-82ee72b054a4
---
 libjava/posix.cc | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 libjava/posix.cc

(limited to 'libjava/posix.cc')

diff --git a/libjava/posix.cc b/libjava/posix.cc
new file mode 100644
index 00000000000..d470a644da3
--- /dev/null
+++ b/libjava/posix.cc
@@ -0,0 +1,104 @@
+// posix.cc -- Helper functions for POSIX-flavored OSs.
+
+/* Copyright (C) 2000  Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+#include <config.h>
+
+#include "posix.h"
+
+#include <errno.h>
+
+#if defined (ECOS)
+extern "C" unsigned long long _clock (void);
+#endif
+
+// gettimeofday implementation.
+void
+_Jv_gettimeofday (struct timeval *tv)
+{
+#if defined (HAVE_GETTIMEOFDAY)
+  gettimeofday (tv, NULL);
+#elif defined (HAVE_TIME)
+  tv->tv_sec = time (NULL);
+  tv->tv_usec = 0;
+#elif defined (HAVE_FTIME)
+  struct timeb t;
+  ftime (&t);
+  tv->tv_sec = t.time;
+  tv->tv_usec = t.millitm * 1000;
+#elif defined (ECOS)
+  // FIXME.
+  tv->tv_sec = _clock () / 1000;
+  tv->tv_usec = 0;
+#else
+  // In the absence of any function, time remains forever fixed.
+  tv->tv_sec = 23;
+  tv->tv_usec = 0;
+#endif
+}
+
+// A wrapper for select() which ignores EINTR.
+int
+_Jv_select (int n, fd_set *readfds, fd_set  *writefds,
+	    fd_set *exceptfds, struct timeval *timeout)
+{
+#ifdef HAVE_SELECT
+  // If we have a timeout, compute the absolute ending time.
+  struct timeval end, delay;
+  if (timeout)
+    {
+      _Jv_gettimeofday (&end);
+      end.tv_usec += timeout->tv_usec;
+      if (end.tv_usec >= 1000000)
+	{
+	  ++end.tv_sec;
+	  end.tv_usec -= 1000000;
+	}
+      end.tv_sec += timeout->tv_sec;
+      delay = *timeout;
+    }
+  else
+    {
+      // Placate compiler.
+      delay.tv_sec = delay.tv_usec = 0;
+    }
+
+  while (1)
+    {
+      int r = select (n, readfds, writefds, exceptfds,
+		      timeout ? &delay : NULL);
+      if (r != -1 || errno != EINTR)
+	return r;
+
+      struct timeval after;
+      if (timeout)
+	{
+	  _Jv_gettimeofday (&after);
+	  // Now compute new timeout argument.
+	  delay.tv_usec = end.tv_usec - after.tv_usec;
+	  delay.tv_sec = end.tv_sec - after.tv_sec;
+	  if (delay.tv_usec < 0)
+	    {
+	      --delay.tv_sec;
+	      delay.tv_usec += 1000000;
+	    }
+	  if (delay.tv_sec < 0)
+	    {
+	      // We assume that the user wants a valid select() call
+	      // more than precise timing.  So if we get a series of
+	      // EINTR we just keep trying with delay 0 until we get a
+	      // valid result.
+	      delay.tv_sec = 0;
+	    }
+	}
+    }
+#else /* HAVE_SELECT */
+  return 0;
+#endif
+}
-- 
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