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#pragma once
#include <cstddef>
namespace DB
{
/** Struct containing a pipe with lazy initialization.
* Use `open` and `close` methods to manipulate pipe and `fds_rw` field to access
* pipe's file descriptors.
*/
struct LazyPipeFDs
{
int fds_rw[2] = {-1, -1};
void open();
void close();
/// Set O_NONBLOCK to different ends of pipe preserving existing flags.
/// Throws an exception if fcntl was not successful.
void setNonBlockingWrite();
void setNonBlockingRead();
void setNonBlockingReadWrite();
void tryIncreaseSize(int desired_size);
~LazyPipeFDs();
};
/** Struct which opens new pipe on creation and closes it on destruction.
* Use `fds_rw` field to access pipe's file descriptors.
*/
struct PipeFDs : public LazyPipeFDs
{
PipeFDs();
};
}
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