C# SafePipeHandle.SetHandle方法代碼示例

 /// <summary>Opens the specified file with the requested flags and mode.</summary>
 /// <param name="path">The path to the file.</param>
 /// <param name="flags">The flags with which to open the file.</param>
 /// <param name="mode">The mode for opening the file.</param>
 /// <returns>A SafeFileHandle for the opened file.</returns>
 internal static SafePipeHandle Open(string path, Interop.libc.OpenFlags flags, int mode)
 {
     // SafePipeHandle wraps a file descriptor rather than a pointer, and a file descriptor is always 4 bytes
     // rather than being pointer sized, which means we can't utilize the runtime's ability to marshal safe handles.
     // Ideally this would be a constrained execution region, but we don't have access to PrepareConstrainedRegions.
     // We still use a finally block to house the code that opens the file and stores the handle in hopes
     // of making it as non-interruptable as possible.  The SafePipeHandle is also allocated first to avoid
     // the allocation after getting the file descriptor but before storing it.
     SafePipeHandle handle = new SafePipeHandle();
     try { }
     finally
     {
         int fd;
         while (Interop.CheckIo(fd = Interop.libc.open(path, flags, mode))) ;
         Debug.Assert(fd >= 0);
         handle.SetHandle((IntPtr)fd);
     }
     return handle;
 }

        /// <summary>Creates an anonymous pipe.</summary>
        /// <param name="inheritability">The inheritability to try to use.  This may not always be honored, depending on platform.</param>
        /// <param name="reader">The resulting reader end of the pipe.</param>
        /// <param name="writer">The resulting writer end of the pipe.</param>
        internal static unsafe void CreateAnonymousPipe(
            HandleInheritability inheritability, out SafePipeHandle reader, out SafePipeHandle writer)
        {
            // Allocate the safe handle objects prior to calling pipe/pipe2, in order to help slightly in low-mem situations
            reader = new SafePipeHandle();
            writer = new SafePipeHandle();

            // Create the OS pipe
            int* fds = stackalloc int[2];
            CreateAnonymousPipe(inheritability, fds);

            // Store the file descriptors into our safe handles
            reader.SetHandle(fds[Interop.Sys.ReadEndOfPipe]);
            writer.SetHandle(fds[Interop.Sys.WriteEndOfPipe]);
        }