1209     int fds[6] = {-1, -1, -1, -1, -1, -1};  in aofCreatePipes()  local
1212     if (pipe(fds) == -1) goto error; /* parent -> children data. */  in aofCreatePipes()
1213     if (pipe(fds+2) == -1) goto error; /* children -> parent ack. */  in aofCreatePipes()
1214     if (pipe(fds+4) == -1) goto error; /* children -> parent ack. */  in aofCreatePipes()
1216     if (anetNonBlock(NULL,fds[0]) != ANET_OK) goto error;  in aofCreatePipes()
1217     if (anetNonBlock(NULL,fds[1]) != ANET_OK) goto error;  in aofCreatePipes()
1218 …if (aeCreateFileEvent(server.el, fds[2], AE_READABLE, aofChildPipeReadable, NULL) == AE_ERR) goto …  in aofCreatePipes()
1220     server.aof_pipe_write_data_to_child = fds[1];  in aofCreatePipes()
1221     server.aof_pipe_read_data_from_parent = fds[0];  in aofCreatePipes()
1222     server.aof_pipe_write_ack_to_parent = fds[3];  in aofCreatePipes()
1223     server.aof_pipe_read_ack_from_child = fds[2];  in aofCreatePipes()
1224     server.aof_pipe_write_ack_to_child = fds[5];  in aofCreatePipes()
1225     server.aof_pipe_read_ack_from_parent = fds[4];  in aofCreatePipes()
1232     for (j = 0; j < 6; j++) if(fds[j] != -1) close(fds[j]);  in aofCreatePipes()