perf inject: Work with files

-v::

--verbose::

	Be more verbose.

-i::

--input=::

	Input file name. (default: stdin)

-o::

--output=::

	Output file name. (default: stdout)

SEE ALSO

--------

struct perf_inject {

	struct perf_tool tool;

	bool		 build_ids;

	const char	 *input_name;

	int		 pipe_output,

			 output;

	u64		 bytes_written;

};

static int perf_event__repipe_synth(struct perf_tool *tool __maybe_unused,

static int perf_event__repipe_synth(struct perf_tool *tool,

				    union perf_event *event,

				    struct machine *machine __maybe_unused)

{

	struct perf_inject *inject = container_of(tool, struct perf_inject, tool);

	uint32_t size;

	void *buf = event;

	size = event->header.size;

	while (size) {

		int ret = write(STDOUT_FILENO, buf, size);

		int ret = write(inject->output, buf, size);

		if (ret < 0)

			return -errno;

		size -= ret;

		buf += ret;

		inject->bytes_written += ret;

	}

	return 0;

		inject->tool.tracing_data = perf_event__repipe_tracing_data;

	}

	session = perf_session__new("-", O_RDONLY, false, true, &inject->tool);

	session = perf_session__new(inject->input_name, O_RDONLY, false, true, &inject->tool);

	if (session == NULL)

		return -ENOMEM;

	if (!inject->pipe_output)

		lseek(inject->output, session->header.data_offset, SEEK_SET);

	ret = perf_session__process_events(session, &inject->tool);

	if (!inject->pipe_output) {

		session->header.data_size = inject->bytes_written;

		perf_session__write_header(session, session->evlist, inject->output, true);

	}

	perf_session__delete(session);

	return ret;

			.tracing_data	= perf_event__repipe_tracing_data_synth,

			.build_id	= perf_event__repipe_op2_synth,

		},

		.input_name  = "-",

	};

	const char *output_name = "-";

	const struct option options[] = {

		OPT_BOOLEAN('b', "build-ids", &inject.build_ids,

			    "Inject build-ids into the output stream"),

		OPT_STRING('i', "input", &inject.input_name, "file",

			   "input file name"),

		OPT_STRING('o', "output", &output_name, "file",

			   "output file name"),

		OPT_INCR('v', "verbose", &verbose,

			 "be more verbose (show build ids, etc)"),

		OPT_END()

	if (argc)

		usage_with_options(inject_usage, options);

	if (!strcmp(output_name, "-")) {

		inject.pipe_output = 1;

		inject.output = STDOUT_FILENO;

	} else {

		inject.output = open(output_name, O_CREAT | O_WRONLY | O_TRUNC,

						  S_IRUSR | S_IWUSR);

		if (inject.output < 0) {

			perror("failed to create output file");

			return -1;

		}

	}

	if (symbol__init() < 0)

		return -1;