createPipe

Create a pipe for interprocess communication and return a (readEnd, writeEnd) Handle pair.

• WinIO Support

When this function is used with WinIO enabled it's the caller's responsibility to register the handles with the I/O manager. If this is not done the operation will deadlock. Association can be done as follows:

#if defined(IO_MANAGER_WINIO)
import GHC.IO.SubSystem ((<!>))
import GHC.IO.Handle.Windows (handleToHANDLE)
import GHC.Event.Windows (associateHandle')
#endif

...

#if defined(IO_MANAGER_WINIO)
return () <!> do
associateHandle' =<< handleToHANDLE readEnd
#endif

Only associate handles that you are in charge of read/writing to. Do not associate handles passed to another process. It's the process's responsibility to register the handle if it supports async access.

The createPipe function creates a pair of connected file descriptors. The first component is the fd to read from, the second is the write end. Although pipes may be bidirectional, this behaviour is not portable and programmers should use two separate pipes for this purpose. May throw an exception if this is an invalid descriptor.

Create a pipe for interprocess communication and return a (readEnd, writeEnd) Handle pair.

• WinIO Support

When this function is used with WinIO enabled it's the caller's responsibility to register the handles with the I/O manager. If this is not done the operation will deadlock. Association can be done as follows:

#if defined(IO_MANAGER_WINIO)
import GHC.IO.SubSystem ((!))
import GHC.IO.Handle.Windows (handleToHANDLE)
import GHC.Event.Windows (associateHandle')
#endif

...

#if defined (IO_MANAGER_WINIO)
return () ! (do
associateHandle' =handleToHANDLE <handle)
#endif

Only associate handles that you are in charge of read/writing to. Do not associate handles passed to another process. It's the process's reponsibility to register the handle if it supports async access.

Lifted createPipe.

Create a new pipe between this process and the child, and return a Handle to communicate with the child.

Create a new pipe between this process and the child, and return a Handle to communicate with the child.

Create a new pipe. The returned Handle will use the default encoding and newline translation mode (just like Handles created by openFile).

Deprecated: Use System.Process from package process directly

Create a new pipe for the stream. You get a new Handle.

Create a pipe for interprocess communication and return a (readEnd, writeEnd) FD pair.

Lifted createPipeFd.

fromJust for dealing with 'Maybe Handle' values as obtained via CreatePipe. Creating a pipe using CreatePipe guarantees a Just value for the corresponding handle.