1. 根目录:
2. tools
3. perf
4. util
5. data.h

#ifndef __PERF_DATA_H
#define __PERF_DATA_H

#include <stdbool.h>

enum perf_data_mode {
	PERF_DATA_MODE_WRITE,
	PERF_DATA_MODE_READ,
};

struct perf_data_file {
	const char		*path;
	int			 fd;
	bool			 is_pipe;
	bool			 force;
	unsigned long		 size;
	enum perf_data_mode	 mode;
};

static inline bool perf_data_file__is_read(struct perf_data_file *file)
{
	return file->mode == PERF_DATA_MODE_READ;
}

static inline bool perf_data_file__is_write(struct perf_data_file *file)
{
	return file->mode == PERF_DATA_MODE_WRITE;
}

static inline int perf_data_file__is_pipe(struct perf_data_file *file)
{
	return file->is_pipe;
}

static inline int perf_data_file__fd(struct perf_data_file *file)
{
	return file->fd;
}

static inline unsigned long perf_data_file__size(struct perf_data_file *file)
{
	return file->size;
}

int perf_data_file__open(struct perf_data_file *file);
void perf_data_file__close(struct perf_data_file *file);
ssize_t perf_data_file__write(struct perf_data_file *file,
			      void *buf, size_t size);

#endif /* __PERF_DATA_H */