/// <summary>
/// Helper for making system calls that involve the stream's file descriptor.
/// System calls are expected to return greather than or equal to zero on success,
/// and less than zero on failure. In the case of failure, errno is expected to
/// be set to the relevant error code.
/// </summary>
/// <param name="sysCall">A delegate that invokes the system call.</param>
/// <param name="arg1">The first argument to be passed to the system call, after the file descriptor.</param>
/// <param name="arg2">The second argument to be passed to the system call.</param>
/// <returns>The return value of the system call.</returns>
/// <remarks>
/// Arguments are expected to be passed via <paramref name="arg1"/> and <paramref name="arg2"/>
/// so as to avoid delegate and closure allocations at the call sites.
/// </remarks>
private static long SysCall(
SafePipeHandle handle,
Func <int, IntPtr, int, long> sysCall,
IntPtr arg1 = default(IntPtr), int arg2 = default(int))
{
bool gotRefOnHandle = false;
try
{
// Get the file descriptor from the handle. We increment the ref count to help
// ensure it's not closed out from under us.
handle.DangerousAddRef(ref gotRefOnHandle);
Debug.Assert(gotRefOnHandle);
int fd = (int)handle.DangerousGetHandle();
Debug.Assert(fd >= 0);
long result;
while (Interop.CheckIo(result = sysCall(fd, arg1, arg2)))
{
;
}
return(result);
}
finally
{
if (gotRefOnHandle)
{
handle.DangerousRelease();
}
}
}
public void Disconnect()
{
if (should_close_handle)
{
Syscall.fclose(handle.DangerousGetHandle());
}
}
/// <summary>
/// Helper for making system calls that involve the stream's file descriptor.
/// System calls are expected to return greather than or equal to zero on success,
/// and less than zero on failure. In the case of failure, errno is expected to
/// be set to the relevant error code.
/// </summary>
/// <param name="sysCall">A delegate that invokes the system call.</param>
/// <param name="arg1">The first argument to be passed to the system call, after the file descriptor.</param>
/// <param name="arg2">The second argument to be passed to the system call.</param>
/// <param name="arg3">The third argument to be passed to the system call.</param>
/// <returns>The return value of the system call.</returns>
/// <remarks>
/// Arguments are expected to be passed via <paramref name="arg1"/> and <paramref name="arg2"/>
/// so as to avoid delegate and closure allocations at the call sites.
/// </remarks>
private long SysCall(
SafePipeHandle handle,
Func <int, IntPtr, int, IntPtr, long> sysCall,
IntPtr arg1 = default(IntPtr), int arg2 = default(int), IntPtr arg3 = default(IntPtr))
{
bool gotRefOnHandle = false;
try
{
// Get the file descriptor from the handle. We increment the ref count to help
// ensure it's not closed out from under us.
handle.DangerousAddRef(ref gotRefOnHandle);
Debug.Assert(gotRefOnHandle);
int fd = (int)handle.DangerousGetHandle();
Debug.Assert(fd >= 0);
while (true)
{
long result = sysCall(fd, arg1, arg2, arg3);
if (result == -1)
{
Interop.ErrorInfo errorInfo = Interop.Sys.GetLastErrorInfo();
if (errorInfo.Error == Interop.Error.EINTR)
{
continue;
}
if (errorInfo.Error == Interop.Error.EPIPE)
{
State = PipeState.Broken;
}
throw Interop.GetExceptionForIoErrno(errorInfo);
}
return(result);
}
}
finally
{
if (gotRefOnHandle)
{
handle.DangerousRelease();
}
}
}
/// <summary>
/// Helper for making system calls that involve the stream's file descriptor.
/// System calls are expected to return greather than or equal to zero on success,
/// and less than zero on failure. In the case of failure, errno is expected to
/// be set to the relevant error code.
/// </summary>
/// <param name="sysCall">A delegate that invokes the system call.</param>
/// <param name="arg1">The first argument to be passed to the system call, after the file descriptor.</param>
/// <param name="arg2">The second argument to be passed to the system call.</param>
/// <returns>The return value of the system call.</returns>
/// <remarks>
/// Arguments are expected to be passed via <paramref name="arg1"/> and <paramref name="arg2"/>
/// so as to avoid delegate and closure allocations at the call sites.
/// </remarks>
private static long SysCall(
SafePipeHandle handle,
Func <int, IntPtr, int, long> sysCall,
IntPtr arg1 = default(IntPtr), int arg2 = default(int))
{
bool gotRefOnHandle = false;
try
{
// Get the file descriptor from the handle. We increment the ref count to help
// ensure it's not closed out from under us.
handle.DangerousAddRef(ref gotRefOnHandle);
Debug.Assert(gotRefOnHandle);
int fd = (int)handle.DangerousGetHandle();
Debug.Assert(fd >= 0);
// System calls may fail due to EINTR (signal interruption). We need to retry in those cases.
while (true)
{
long result = sysCall(fd, arg1, arg2);
if (result < 0)
{
int errno = Marshal.GetLastWin32Error();
if (errno == Interop.Errors.EINTR)
{
continue;
}
else
{
throw Interop.GetExceptionForIoErrno(errno);
}
}
return(result);
}
}
finally
{
if (gotRefOnHandle)
{
handle.DangerousRelease();
}
}
}
/// <summary>
/// Creates a cancellation registration. This creates a pipe that'll have one end written to
/// when cancellation is requested. The other end can be poll'd to see when cancellation has occurred.
/// </summary>
private static unsafe DescriptorCancellationRegistration RegisterForCancellation(CancellationToken cancellationToken)
{
Debug.Assert(cancellationToken.CanBeCanceled);
// Fast path: before doing any real work, throw if cancellation has already been requested
cancellationToken.ThrowIfCancellationRequested();
// Create a pipe we can use to send a signal to the reader/writer
// to wake it up if blocked.
SafePipeHandle poll, send;
CreateAnonymousPipe(HandleInheritability.None, out poll, out send);
// Register a cancellation callback to send a byte to the cancellation pipe
CancellationTokenRegistration reg = cancellationToken.Register(s =>
{
SafePipeHandle sendRef = (SafePipeHandle)s;
bool gotSendRef = false;
try
{
sendRef.DangerousAddRef(ref gotSendRef);
int fd = (int)sendRef.DangerousGetHandle();
byte b = 1;
while (Interop.CheckIo((int)Interop.Sys.Write(fd, &b, 1)))
{
;
}
}
finally
{
if (gotSendRef)
{
sendRef.DangerousRelease();
}
}
}, send);
// Return a disposable struct that will unregister the cancellation registration
// and dispose of the pipe.
return(new DescriptorCancellationRegistration(reg, poll, send));
}
public String GetClientHandleAsString()
{
_clientHandleExposed = true;
GC.SuppressFinalize(_clientHandle);
return(_clientHandle.DangerousGetHandle().ToString());
}
public String GetClientHandleAsString()
{
_clientHandleExposed = true;
return(_clientHandle.DangerousGetHandle().ToString());
}
