Thanks Rainer.
On Sun, Feb 8, 2009 at 8:50 PM, Rainer Jung <rainer.j...@kippdata.de> wrote: > On 28.01.2009 06:50, Paras Fadte wrote: >> >> I have somewhat modified the rotatlogs utility to support compression >> . Although it creates files in compressed format (.gz) and rotates >> them properly the issue that i am facing is that when apache is >> restarted (graceful or stop/start way ) the last created compressed >> file doesn't seem to get closed . Is there a way to rectify this ? >> For compression I am using zlib . > > When httpd is restarted or stopped, then most rotatelogs processes get > stopped via a signal. The signal could depend on the platform, but in my > case it's SIGTERM. You can "truss" your rotatelogs to verify yourself, > whether that's true for your Linux system too. truss will show you the > signal the rotatelogs process received before terminating. > > Then you need to register a signal handler, e.g. > > apr_signal(SIG_TERM, my_signal_handler); > > which gets called automatically, whenever the process receives the > respective signal. Your signal handler my_signal_handler() could then set an > internal flag, indicating that you want to cleanup and exit rotatelogs. > > You can check this flag before and after the blocking read from the log > pipe, and if it is set, close your gzip output cleanly and exit rotatelogs. > > You can temporarily deactivate or activate all signal handlers for SIG_TERM > with > > apr_signal_unblock(SIG_TERM); > > and > > apr_signal_block(SIG_TERM); > > The ErrorLog for the global server behaves a little different, when > restarting Apache it doesn't get a signal but instead it will get an EPIPE > when trying to read from the log pipe. > > Regards, > > Rainer > >> On Fri, Jan 23, 2009 at 1:41 PM, Paras Fadte<plf...@gmail.com> wrote: >>> >>> Thanks Rainer, >>> >>> yeah.. me not a pro at development . >>> >>> On Fri, Jan 23, 2009 at 1:30 PM, Rainer Jung<rainer.j...@kippdata.de> >>> wrote: >>>> >>>> On 23.01.2009 08:45, Paras Fadte wrote: >>>>> >>>>> Can you please tell me in which file ? >>>> >>>> I assume you are building rotatelogs from within the httpd sources. >>>> >>>> There is a file support/Makefile, which contains a line >>>> >>>> $(LINK) $(rotatelogs_LTFLAGS) $(rotatelogs_OBJECTS) $(PROGRAM_LDADD) >>>> >>>> Simply add "-lz" at the end of the line: >>>> >>>> $(LINK) $(rotatelogs_LTFLAGS) $(rotatelogs_OBJECTS) $(PROGRAM_LDADD) -lz >>>> >>>> In case you don't know what a Makefile is and how it basically works, >>>> you >>>> need to read about how to do C software development. >>>> >>>> Regards, >>>> >>>> Rainer >>>> >>>>> On Fri, Jan 23, 2009 at 1:09 PM, Rainer Jung<rainer.j...@kippdata.de> >>>>> wrote: >>>>>> >>>>>> On 23.01.2009 07:55, Paras Fadte wrote: >>>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> I get following error when I try to use "compress" function of zlib >>>>>>> in >>>>>>> "rotatelogs.c" . I have included "zlib.h" in rotatelogs.c . >>>>>>> >>>>>>> /home/paras/httpd-2.0.55/support/rotatelogs.c:294: undefined >>>>>>> reference >>>>>>> to `compress' >>>>>>> collect2: ld returned 1 exit status >>>>>>> >>>>>>> Is it linking error ? where should I make the changes to eliminate >>>>>>> this >>>>>>> error? >>>>>> >>>>>> Add -lz to the linking flags. >
