Marcelo Fernández <marcelo.fidel.fernan...@gmail.com> added the comment:
2009/12/6 Daniele Varrazzo <rep...@bugs.python.org>: >> My question is because I think there's a better and supported method > for >> Linux, that is, using prctl [1]. I read somewhere that changing argv >> causes some inconsistencies between programs who read /sys files, > /proc >> files... or I don't remember what, but it is, in fact, not the >> *recommended* way. Prctl is. :-) > > This is interesting: do you have any reference? For example, take a look at the comments here: http://abock.org/2006/02/09/changing-process-name-in-mono It seems that some utilities and programs (killall, gnome-system-monitor, and so on) looks for the process name in /proc/PID/status, not in /proc/PID/cmdline, so it should be better (in Linux), to modify both, /proc/PID/cmdline (changing argv) *and* /proc/PID/status (calling prctl()). I installed py-setproctitle, and can't kill it with killall once I set the name to "hello", for example. :-( [1]+ Detenido python marc...@marcelo-laptop:~/src/py-setproctitle$ ps a PID TTY STAT TIME COMMAND 1030 tty4 Ss+ 0:00 /sbin/getty -8 38400 tty4 1033 tty5 Ss+ 0:00 /sbin/getty -8 38400 tty5 1049 tty2 Ss+ 0:00 /sbin/getty -8 38400 tty2 1050 tty3 Ss+ 0:00 /sbin/getty -8 38400 tty3 1052 tty6 Ss+ 0:00 /sbin/getty -8 38400 tty6 1349 tty7 Ss+ 17:14 /usr/bin/X :0 -br -verbose -auth /var/run/gdm/auth-for-gdm-XhETSO/database -nolisten tcp vt7 2225 tty1 Ss+ 0:00 /sbin/getty -8 38400 tty1 10344 pts/0 Ss+ 0:00 /bin/bash -l 11923 pts/1 Ss 0:00 bash 12068 pts/2 Ss+ 0:00 bash 12485 pts/1 T 0:00 hello 12496 pts/1 R+ 0:00 ps a marc...@marcelo-laptop:~/src/py-setproctitle$ killall hello hello: proceso no encontrado Another example: The gnome-system-monitor still lists the 'hello' process (PID 12485) like 'python'. So we should try > I've tested with the difference between clobbering argv and call > prctl: two demo programs are in the tools directory of the module > project [2]. > > For what I observed, clobbering argv changes what shown in > ``/proc/PID/cmdline``, whereas prctl changes what can be read in > ``/proc/PID/status`` (and ``stat`` too). ``ps`` uses the former, but > switches to the latter when calling ``ps a`` and ``ps f``. ``top`` > toggles between the two pressing ``c``. Sorry, but here (Ubuntu 9.10) it works the other way around: "ps" lists the /proc/PID/status -> name field and "ps a" lists the /proc/PID/cmdline. But I got the explanation. :-) > I think is probably better to have both strings updated: I'd prefer > this behavior instead of the title being set in different places on > different Linux versions. IMHO, I'd prefer both things: to change the argv array *and* calling prctl() if possible (Linux >2.6.9). If Linux is lower than 2.6.9, fallback to change argv only. Regards -- Marcelo F. Fernández Buenos Aires, Argentina Licenciado en Sistemas - CCNA E-Mail: marcelo.fidel.fernan...@gmail.com Blog: http://blog.marcelofernandez.info Twitter: http://twitter.com/fidelfernandez ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue5672> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
