The standard error channel.Using this value will result in standard error being set to non-blocking mode.The standard error will be reset to its original state after the program exits.
The standard input channel.Using this value will result in standard input being set to non-blocking mode.The standard input will be reset to its original state after the program exits.
The standard output channel.Using this value will result in standard output being set to non-blocking mode.The standard output will be reset to its original state after the program exits.