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Accessors for process-object attributes. The ports values are only defined for processes created with process or process* and represent the input port from which data written by the sub-process can be read, the output port from which any data written to will be received as input in the sub-process and the error port where to which the sub-process directs its error output. Blocking reads and writes to or from the ports returned by process only block the current thread, not other threads executing concurrently.

Standard error for the subprocess is linked up to the current process's standard error (see process* if you want to reify its standard error into a separate port).