linux-kernel - Re: [PATCH 1/9] perf list: Use relative path for tracepoint scan

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Date:   Mon, 3 Apr 2023 18:59:10 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH 1/9] perf list: Use relative path for tracepoint scan

Em Fri, Mar 31, 2023 at 01:29:41PM -0700, Namhyung Kim escreveu:
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/print-events.c | 26 ++++++++++++++++++++------
>  1 file changed, 20 insertions(+), 6 deletions(-)

Add to add this to fix on Alma Linux 8, and scandirat isn't being found
on musl libc (Alpine Linux), probably we'll need some scaffolding...

- Arnaldo


diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index 26a7e017c9284c01..28aa0b9300253d0a 100644
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -6,6 +6,7 @@
 #include <string.h>
 #include <fcntl.h>
 #include <sys/param.h>
+#include <unistd.h>
 
 #include <api/fs/tracing_path.h>
 #include <linux/stddef.h>
 
> diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
> index 62e9ea7dcf40..26a7e017c928 100644
> --- a/tools/perf/util/print-events.c
> +++ b/tools/perf/util/print-events.c
> @@ -4,6 +4,7 @@
>  #include <stdio.h>
>  #include <stdlib.h>
>  #include <string.h>
> +#include <fcntl.h>
>  #include <sys/param.h>
>  
>  #include <api/fs/tracing_path.h>
> @@ -59,12 +60,20 @@ static const struct event_symbol event_symbols_tool[PERF_TOOL_MAX] = {
>  void print_tracepoint_events(const struct print_callbacks *print_cb, void *print_state)
>  {
>  	struct dirent **sys_namelist = NULL;
> +	char *events_path = get_tracing_file("events");
>  	int sys_items = tracing_events__scandir_alphasort(&sys_namelist);
> +	int events_fd = open(events_path, O_PATH);
> +
> +	put_tracing_file(events_path);
> +	if (events_fd < 0) {
> +		printf("Error: failed to open tracing events directory\n");
> +		return;
> +	}
>  
>  	for (int i = 0; i < sys_items; i++) {
>  		struct dirent *sys_dirent = sys_namelist[i];
>  		struct dirent **evt_namelist = NULL;
> -		char *dir_path;
> +		int dir_fd;
>  		int evt_items;
>  
>  		if (sys_dirent->d_type != DT_DIR ||
> @@ -72,22 +81,26 @@ void print_tracepoint_events(const struct print_callbacks *print_cb, void *print
>  		    !strcmp(sys_dirent->d_name, ".."))
>  			continue;
>  
> -		dir_path = get_events_file(sys_dirent->d_name);
> -		if (!dir_path)
> +		dir_fd = openat(events_fd, sys_dirent->d_name, O_PATH);
> +		if (dir_fd < 0)
>  			continue;
>  
> -		evt_items = scandir(dir_path, &evt_namelist, NULL, alphasort);
> +		evt_items = scandirat(events_fd, sys_dirent->d_name, &evt_namelist, NULL, alphasort);
>  		for (int j = 0; j < evt_items; j++) {
>  			struct dirent *evt_dirent = evt_namelist[j];
>  			char evt_path[MAXPATHLEN];
> +			int evt_fd;
>  
>  			if (evt_dirent->d_type != DT_DIR ||
>  			    !strcmp(evt_dirent->d_name, ".") ||
>  			    !strcmp(evt_dirent->d_name, ".."))
>  				continue;
>  
> -			if (tp_event_has_id(dir_path, evt_dirent) != 0)
> +			snprintf(evt_path, sizeof(evt_path), "%s/id", evt_dirent->d_name);
> +			evt_fd = openat(dir_fd, evt_path, O_RDONLY);
> +			if (evt_fd < 0)
>  				continue;
> +			close(evt_fd);
>  
>  			snprintf(evt_path, MAXPATHLEN, "%s:%s",
>  				 sys_dirent->d_name, evt_dirent->d_name);
> @@ -103,10 +116,11 @@ void print_tracepoint_events(const struct print_callbacks *print_cb, void *print
>  					/*long_desc=*/NULL,
>  					/*encoding_desc=*/NULL);
>  		}
> -		free(dir_path);
> +		close(dir_fd);
>  		free(evt_namelist);
>  	}
>  	free(sys_namelist);
> +	close(events_fd);
>  }
>  
>  void print_sdt_events(const struct print_callbacks *print_cb, void *print_state)
> -- 
> 2.40.0.348.gf938b09366-goog
> 

-- 

- Arnaldo