Normally with a short option we don't provide an equals sign like this
-tfile.txt
-t file.txt

But we do provide an equals sign with the long option like this
--trace=file.txt

Also, a good parser should work with a space instead of an equals sign
--trace file.txt

Most of these are broken!

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
Saving trace to ile.txt
File name truncated

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
Saving trace to timerlat_trace.txt
Default file name used instead of the requested one.

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
Saving trace to file.txt
This works, but people normally don't use '=' with a short option

/rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
Saving trace to ile.txt
File name truncated

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
timerlat_trace.txt
Default file name used instead of the requested one.

After the fix

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
Saving trace to file.txt

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
Saving trace to file.txt

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
Saving trace to file.txt

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
Saving trace to file.txt

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
Saving trace to file.txt

I also tested -t and --trace without providing a file name both as the
last requested option and with a following long and short option

For example

./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t -u
./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace -u
./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t
./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace

And all correctly do Saving trace to timerlat_trace.txt as expected

This fix is applied to both timerlat top and hist
and to osnoise top and hist

Signed-off-by: John Kacur <jkacur@redhat.com>
---
 tools/tracing/rtla/src/osnoise_hist.c  | 11 ++++++++---
 tools/tracing/rtla/src/osnoise_top.c   | 11 ++++++++---
 tools/tracing/rtla/src/timerlat_hist.c | 11 ++++++++---
 tools/tracing/rtla/src/timerlat_top.c  | 11 ++++++++---
 4 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
index 01870d50942a..8ff1c816eb6a 100644
--- a/tools/tracing/rtla/src/osnoise_hist.c
+++ b/tools/tracing/rtla/src/osnoise_hist.c
@@ -640,9 +640,14 @@ static struct osnoise_hist_params
 			params->threshold = get_llong_from_str(optarg);
 			break;
 		case 't':
-			if (optarg)
-				/* skip = */
-				params->trace_output = &optarg[1];
+			if (optarg) {
+				if (optarg[0] == '=')
+					params->trace_output = &optarg[1];
+				else
+					params->trace_output = &optarg[0];
+			}
+			else if (optind < argc && argv[optind][0] != '0')
+				params->trace_output = argv[optind];
 			else
 				params->trace_output = "osnoise_trace.txt";
 			break;
diff --git a/tools/tracing/rtla/src/osnoise_top.c b/tools/tracing/rtla/src/osnoise_top.c
index 457360db0767..c685d881daf1 100644
--- a/tools/tracing/rtla/src/osnoise_top.c
+++ b/tools/tracing/rtla/src/osnoise_top.c
@@ -480,9 +480,14 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 			params->stop_total_us = get_llong_from_str(optarg);
 			break;
 		case 't':
-			if (optarg)
-				/* skip = */
-				params->trace_output = &optarg[1];
+			if (optarg){
+				if (optarg[0] == '=')
+					params->trace_output = &optarg[1];
+				else
+					params->trace_output = &optarg[0];
+			}
+			else if (optind < argc && argv[optind][0] != '-')
+				params->trace_output = argv[optind];
 			else
 				params->trace_output = "osnoise_trace.txt";
 			break;
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c
index 8bd51aab6513..d2a639d3c02c 100644
--- a/tools/tracing/rtla/src/timerlat_hist.c
+++ b/tools/tracing/rtla/src/timerlat_hist.c
@@ -720,9 +720,14 @@ static struct timerlat_hist_params
 			params->stop_total_us = get_llong_from_str(optarg);
 			break;
 		case 't':
-			if (optarg)
-				/* skip = */
-				params->trace_output = &optarg[1];
+			if (optarg) {
+				if (optarg[0] == '=')
+					params->trace_output = &optarg[1];
+				else
+					params->trace_output = &optarg[0];
+			}
+			else if (optind < argc && argv[optind][0] != '-')
+				params->trace_output = argv[optind];
 			else
 				params->trace_output = "timerlat_trace.txt";
 			break;
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index 8a3fa64319c6..e6e75937832e 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -547,9 +547,14 @@ static struct timerlat_top_params
 			params->stop_total_us = get_llong_from_str(optarg);
 			break;
 		case 't':
-			if (optarg)
-				/* skip = */
-				params->trace_output = &optarg[1];
+			if (optarg) {
+				if (optarg[0] == '=')
+					params->trace_output = &optarg[1];
+				else
+					params->trace_output = &optarg[0];
+			}
+			else if (optind < argc && argv[optind][0] != '-')
+				params->trace_output = argv[optind];
 			else
 				params->trace_output = "timerlat_trace.txt";
 
-- 
2.44.0

On 5/8/24 23:21, John Kacur wrote:
> Normally with a short option we don't provide an equals sign like this
> -tfile.txt
> -t file.txt
> 
> But we do provide an equals sign with the long option like this
> --trace=file.txt
> 
> Also, a good parser should work with a space instead of an equals sign
> --trace file.txt
> 
> Most of these are broken!

So, it is set to work _only_ with =file. It would be better to have
it more robust... yes.

> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
> Saving trace to ile.txt
> File name truncated
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
> Saving trace to timerlat_trace.txt
> Default file name used instead of the requested one.
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
> Saving trace to file.txt
> This works, but people normally don't use '=' with a short option
> 
> /rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
> Saving trace to ile.txt
> File name truncated
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
> timerlat_trace.txt
> Default file name used instead of the requested one.
> 
> After the fix
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -tfile.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t file.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t=file.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace=file.txt
> Saving trace to file.txt
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace file.txt
> Saving trace to file.txt
> 
> I also tested -t and --trace without providing a file name both as the
> last requested option and with a following long and short option
> 
> For example
> 
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t -u
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace -u
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 -t
> ./rtla timerlat hist -P f:95 -u -c0-11 -E3500 -T50 --trace
> 
> And all correctly do Saving trace to timerlat_trace.txt as expected
> 
> This fix is applied to both timerlat top and hist
> and to osnoise top and hist.

Ok, code wise it is fine. But it is still missing the changes for the --help
messages and man pages. Would you mind addressing them?

For instance, removing the need for the =...

s/
-t/--trace[=file]: save the stopped trace to [file|timerlat_trace.txt]
/
-t/--trace [file]: save the stopped trace to [file|timerlat_trace.txt]
/

Also, for the man page we will have to move the -t option from common_options.rst
to common_timerlat_options.rst and common_osnoise_options.rst to fix this in
man rtla-timerlat-top:

       -t, --trace[=file]
          Save the stopped trace to [file|osnoise_trace.txt].

(it is pointing to the wrong file)

Thanks!
-- Daniel