newlib-2.4.0

git-svn-id: svn://kolibrios.org@6536 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdio/fsetlocking.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2014 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*
+FUNCTION
+<<__fsetlocking>>---set or query locking mode on FILE stream
+
+INDEX
+	__fsetlocking
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	#include <stdio_ext.h>
+	int __fsetlocking(FILE *<[fp]>, int <[type]>);
+
+DESCRIPTION
+This function sets how the stdio functions handle locking of FILE <[fp]>.
+The following values describe <[type]>:
+
+<<FSETLOCKING_INTERNAL>> is the default state, where stdio functions
+automatically lock and unlock the stream.
+
+<<FSETLOCKING_BYCALLER>> means that automatic locking in stdio functions
+is disabled. Applications which set this take all responsibility for file
+locking themselves.
+
+<<FSETLOCKING_QUERY>> returns the current locking mode without changing it.
+
+RETURNS
+<<__fsetlocking>> returns the current locking mode of <[fp]>.
+
+PORTABILITY
+This function originates from Solaris and is also provided by GNU libc.
+
+No supporting OS subroutines are required.
+*/
+
+#ifndef __rtems__
+
+#include <_ansi.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include "local.h"
+
+int
+_DEFUN(__fsetlocking, (fp, type),
+       FILE * fp _AND
+       int type)
+{
+  int result;
+  CHECK_INIT(_REENT, fp);
+  result = (fp->_flags2 & __SNLK) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
+  switch (type)
+    {
+    case FSETLOCKING_BYCALLER:
+      fp->_flags2 |= __SNLK;
+      break;
+    case FSETLOCKING_INTERNAL:
+      fp->_flags2 &= ~__SNLK;
+      break;
+    case FSETLOCKING_QUERY:
+    default:
+      break;
+    }
+  return result;
+}
+
+#endif /* __rtems__ */