Diagram

stream # | in_fd | out_fd |
0 | stdin | - |
1 | - | stdout |
2 | - | stderr |

stream # | in_fd | out_fd |
0 | - | pipe_0_out_wr |
1 | pipe_1_in_rd | - |
2 | pipe_2_in_rd | - |
stream # | in_fd | out_fd |
0 | stdin | - |
1 | - | stdout |
2 | - | stderr |
stream # | in_fd | out_fd |
0 | - | pipe_0_out_wr |
1 | pipe_1_in_rd | - |
2 | pipe_2_in_rd | - |
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