On 07/16/13 at 02:00pm, Kay Sievers wrote: > On Tue, Jul 16, 2013 at 5:30 AM, WANG Chao <chaow...@redhat.com> wrote: > > On 07/15/13 at 10:46pm, Lennart Poettering wrote: > >> On Mon, 15.07.13 17:56, WANG Chao (chaow...@redhat.com) wrote: > >> > >> > I have a service (a script) running under systemd and need its stderr to > >> > be output'd immediately, not line buffered. I tried serveral ways but > >> > didn't work out. I hope to get some feedback here :) > >> > >> This is not supported. Logging doesn't deal in individual > >> characters, really, but in log lines. Syslog doesn't do that, and > >> neither does the Journal. > >> > >> And we will never support that, as allowing this would require us to > >> always store the context a character was printed in so that lines could > >> later be reassembled. But we cannot really do that. > >> > >> So, I fear I have to tell you that this is not supported and never > >> will... > > > > I understand that. Record the context of a character is printed would > > never be a good idea. But still, I feel pity about line buffered stderr > > stream in Journal :( > > It is the right thing to buffer just buffer them to full lines.
Yes. Or buffer wouldn't be called "buffer". > > For the kernel counterpart, we added unbuffered console magic to the > kernel. It is really nasty and broken hack and really makes not much > sense in th eend. The code does work in the most common case, but just > does stupid things as soon as things start to compete about the log. > > > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=084681d14e429cb6192262ac7437f00e2c02f26a > > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=eab072609e11a357181806ab5a5c309ef6eb76f5 > > Pretending to support pushing "animations" through a log system is a > pretty bad idea and relies on technical promises nobody can really > hold without inventing something that isn't logging anymore. But we > have that already, it's the console. :) I couldn't agree more. Log system can't really record "animations" in a common way. So in my case, console is right thing to use. Thanks for your information here. Have a good day! WANG Chao _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel