tools/perf/util/data.h

Source file repositories/reference/linux-study-clean/tools/perf/util/data.h

File Facts

System
Linux kernel
Corpus path
tools/perf/util/data.h
Extension
.h
Size
4010 bytes
Lines
143
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct perf_data_file {
	/**
	 * @path: Path of file. Generally a copy of perf_data.path but for a
	 * directory it is the file within the directory.
	 */
	char		*path;
	union {
		/** @fd: File descriptor for read/writes. Valid if use_stdio is false. */
		int	 fd;
		/**
		 * @fptr: Stdio FILE. Valid if use_stdio is true, currently just
		 * pipes in perf inject.
		 */
		FILE	*fptr;
	};
	/** @size: Size of file when opened. */
	unsigned long	 size;
	/** @use_stdio: Use buffered stdio operations. */
	bool		 use_stdio;
};

/**
 * struct perf_data: A wrapper around a file used for perf.data reading or writing.
 */
struct perf_data {
	/** @path: Path to open and of the file. NULL implies 'perf.data' will be used. */
	const char		*path;
	/** @file: Underlying file to be used. */
	struct perf_data_file	 file;
	/** @is_pipe: Underlying file is a pipe. */
	bool			 is_pipe;
	/** @is_dir: Underlying file is a directory. */
	bool			 is_dir;
	/** @force: Ignore opening a file creating created by a different user. */
	bool			 force;
	/** @in_place_update: A file opened for reading but will be written to. */
	bool			 in_place_update;
	/** @mode: Read or write mode. */
	enum perf_data_mode	 mode;

	struct {
		/** @version: perf_dir_version. */
		u64			 version;
		/** @files: perf data files for the directory. */
		struct perf_data_file	*files;
		/** @nr: Number of perf data files for the directory. */
		int			 nr;
	} dir;
};

static inline int perf_data_file__fd(struct perf_data_file *file)
{
	return file->use_stdio ? fileno(file->fptr) : file->fd;
}

ssize_t perf_data_file__write(struct perf_data_file *file,
			      void *buf, size_t size);
off_t perf_data_file__seek(struct perf_data_file *file, off_t offset, int whence);


static inline bool perf_data__is_read(struct perf_data *data)
{
	return data->mode == PERF_DATA_MODE_READ;
}

static inline bool perf_data__is_write(struct perf_data *data)
{
	return data->mode == PERF_DATA_MODE_WRITE;
}

static inline int perf_data__is_pipe(struct perf_data *data)
{
	return data->is_pipe;
}

static inline bool perf_data__is_dir(struct perf_data *data)
{
	return data->is_dir;
}

static inline bool perf_data__is_single_file(struct perf_data *data)
{
	return data->dir.version == PERF_DIR_SINGLE_FILE;
}

static inline int perf_data__fd(struct perf_data *data)
{
	return perf_data_file__fd(&data->file);
}

Annotation

Implementation Notes