1 | #pragma once |
2 | |
3 | #include <cstddef> |
4 | |
5 | |
6 | namespace DB |
7 | { |
8 | |
9 | /** Struct containing a pipe with lazy initialization. |
10 | * Use `open` and `close` methods to manipulate pipe and `fds_rw` field to access |
11 | * pipe's file descriptors. |
12 | */ |
13 | struct LazyPipeFDs |
14 | { |
15 | int fds_rw[2] = {-1, -1}; |
16 | |
17 | void open(); |
18 | void close(); |
19 | |
20 | void setNonBlocking(); |
21 | void tryIncreaseSize(int desired_size); |
22 | |
23 | ~LazyPipeFDs(); |
24 | }; |
25 | |
26 | |
27 | /** Struct which opens new pipe on creation and closes it on destruction. |
28 | * Use `fds_rw` field to access pipe's file descriptors. |
29 | */ |
30 | struct PipeFDs : public LazyPipeFDs |
31 | { |
32 | PipeFDs(); |
33 | }; |
34 | |
35 | } |
36 | |