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The flags affect new processes spawning.
XSHELL_CLOSED_ERROR
the standard error will be closed for the process
XSHELL_NONBLOCKING_INPUT
the file from which the process reads (and made available by xs_input) will be opened in non blocking mode
See Nonblocking I/O.
XSHELL_NONBLOCKING_OUTPUT
the file to which the process writes (and made available by xs_output) will be opened in non blocking mode
See Nonblocking I/O.