summaryrefslogtreecommitdiff
path: root/src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs
diff options
context:
space:
mode:
authorJiyoung Yun <jy910.yun@samsung.com>2016-12-27 16:46:08 +0900
committerJiyoung Yun <jy910.yun@samsung.com>2016-12-27 16:46:08 +0900
commitdb20f3f1bb8595633a7e16c8900fd401a453a6b5 (patch)
treee5435159cd1bf0519276363a6fe1663d1721bed3 /src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs
parent4b4aad7217d3292650e77eec2cf4c198ea9c3b4b (diff)
downloadcoreclr-db20f3f1bb8595633a7e16c8900fd401a453a6b5.tar.gz
coreclr-db20f3f1bb8595633a7e16c8900fd401a453a6b5.tar.bz2
coreclr-db20f3f1bb8595633a7e16c8900fd401a453a6b5.zip
Imported Upstream version 1.0.0.9127upstream/1.0.0.9127
Diffstat (limited to 'src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs')
-rw-r--r--src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs36
1 files changed, 36 insertions, 0 deletions
diff --git a/src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs b/src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs
new file mode 100644
index 0000000000..69e39b30d2
--- /dev/null
+++ b/src/mscorlib/corefx/Interop/Unix/System.Native/Interop.PosixFAdvise.cs
@@ -0,0 +1,36 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Runtime.InteropServices;
+using Microsoft.Win32.SafeHandles;
+
+internal static partial class Interop
+{
+ internal static partial class Sys
+ {
+ internal enum FileAdvice : int
+ {
+ POSIX_FADV_NORMAL = 0, /* no special advice, the default value */
+ POSIX_FADV_RANDOM = 1, /* random I/O access */
+ POSIX_FADV_SEQUENTIAL = 2, /* sequential I/O access */
+ POSIX_FADV_WILLNEED = 3, /* will need specified pages */
+ POSIX_FADV_DONTNEED = 4, /* don't need the specified pages */
+ POSIX_FADV_NOREUSE = 5, /* data will only be acessed once */
+ }
+
+ /// <summary>
+ /// Notifies the OS kernel that the specified file will be accessed in a particular way soon; this allows the kernel to
+ /// potentially optimize the access pattern of the file.
+ /// </summary>
+ /// <param name="fd">The file descriptor of the file</param>
+ /// <param name="offset">The start of the region to advise about</param>
+ /// <param name="length">The number of bytes of the region (until the end of the file if 0)</param>
+ /// <param name="advice">The type of advice to give the kernel about the specified region</param>
+ /// <returns>
+ /// Returns 0 on success; otherwise, the error code is returned
+ /// </returns>
+ [DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_PosixFAdvise", SetLastError = false /* this is explicitly called out in the man page */)]
+ internal static extern int PosixFAdvise(SafeFileHandle fd, long offset, long length, FileAdvice advice);
+ }
+}