--print-buffer-syncdelay, lib/cobalt/init.c:cobalt_help()

--print-buffer-syncdelay, lib/cobalt/init.c:cobalt_help()

[Steve Freyder]

Greetings,

I had a dev complain about losing stdio output in a Xenomai app, and
had never looked at rt_printf() and friends before.  I had
problems attempting to use --print-buffer-syncdelay=1 to reduce the
delay to 1(ms), I found that my programs started complaining about an
invalid switch.  Found that cobalt_help() was out of sync with the
actual switch name definition --print-sync-delay.

Here's a lame attempt at a patch.

Regards,
Steve
------------------------------------------------------------------------


lib/cobalt:
------------------------------------------------------------------------
diff -Naur a/init.c b/init.c
--- a/init.c    2018-06-15 10:26:19.692062099 -0500
+++ b/init.c    2019-05-02 11:16:07.894454047 -0500
@@ -349,7 +349,7 @@
          fprintf(stderr, "--main-prio=<prio>            main thread 
priority\n");
          fprintf(stderr, "--print-buffer-size=<bytes>   size of a print 
relay buffer (16k)\n");
          fprintf(stderr, "--print-buffer-count=<num> number of print 
relay buffers (4)\n");
-        fprintf(stderr, "--print-buffer-syncdelay=<ms> max delay of 
output synchronization (100 ms)\n");
+        fprintf(stderr, "--print-sync-delay=<ms>       max delay of 
output synchronization (100 ms)\n");
  }

  static struct setup_descriptor cobalt_interface = {
------------------------------------------------------------------------

RE: --print-buffer-syncdelay, lib/cobalt/init.c:cobalt_help()

[Jeff Webb]

I was converting an old Xenomai 2.6 application to 3.1, and had to adjust the RT print buffer settings from environment variables to command-line options.  I had trouble with xenomai_init() not removing one of the command-line arguments it should have processed.  After doing a web search, I came across this:

  https://www.xenomai.org/pipermail/xenomai/2019-May/040883.html

It looks like a fix for this hasn't made it into 3.1 yet.

To summarize, a xenomai application's --help output says:

  --print-buffer-syncdelay=<ms>   max delay of output synchronization (100 ms)

But xenomai_init() doesn't remove this option from argv, so I don't think it recognizes it.  Based on the above mailing list post, I tried:

  --print-sync-delay=100

and it then removes the option from argv, so I assume this is the option name it is looking for.  I didn't try the patch posted in the original email to see if it worked.

-Jeff