/// <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]);
}
/// <summary>Creates an anonymous pipe.</summary>
/// <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(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. We always create it as O_CLOEXEC (trying to do so atomically) so that the
// file descriptors aren't inherited. Then if inheritability was requested, we opt-in the child file
// descriptor later; if the server file descriptor was also inherited, closing the server file
// descriptor would fail to signal EOF for the child side.
int *fds = stackalloc int[2];
Interop.CheckIo(Interop.Sys.Pipe(fds, Interop.Sys.PipeFlags.O_CLOEXEC));
// Store the file descriptors into our safe handles
reader.SetHandle(fds[Interop.Sys.ReadEndOfPipe]);
writer.SetHandle(fds[Interop.Sys.WriteEndOfPipe]);
}