Re: [PATCH v2 4/4] Make all print functions receive the fp argument, and opens a dump file in process_event.

[Jiri Olsa <jolsa@redhat.com>]

On Tue, Sep 26, 2017 at 02:53:17PM +0800, yuzhoujian wrote:

SNIP

> -	fprint_sample_start(sample, thread, evsel, stdout);
> +	/* the dump file name is <ORIGINAL PERF DATA FILE NAME>-script-dump-<EVENT NAME>.txt */
> +	evname = perf_evsel__name(evsel);
> +	if (script->tool.per_event_dump) {
> +		if (asprintf(&filename, "%s%s%s%s", file_name, "-script-dump-", evname, ".txt") < 0)
> +			filename = NULL;
> +		fp = fopen(filename, "a+");
> +		if (!fp)
> +			return;
> +		free(filename);
> +	}
> +	fprint_sample_start(sample, thread, evsel, fp);
>  

SNIP

>  
>  	if (PRINT_FIELD(PHYS_ADDR))
> -		fprintf(stdout, "%16" PRIx64, sample->phys_addr);
> -	fprintf(stdout, "\n");
> +		fprintf(fp, "%16" PRIx64, sample->phys_addr);
> +	fprintf(fp, "\n");
> +	if (script->tool.per_event_dump)
> +		fclose(fp);

so you open and close the file for each sample.. I think
we should store the FILE* in perf_evsel::priv

open it at the first time sample/event is processed
and close at the end of the perf script

jirka