Christian Hesse <l...@eworm.de> on Mon, 2014/10/13 20:22: > Daurnimator <q...@daurnimator.com> on Mon, 2014/10/13 01:27: > > Hi All, > > > > I was trying to write a program that tailed the journal, but found that > > sd_journal_seek_tail() didn't work as expected. > > That is: that it would seek to the last/most recent thing in the journal, > > and I could tail things from there. > > > > I whipped up a quick demonstration program, that shows that messages I > > 'next' through, are before the 'cutoff': > > > > [code and output] > > > > Is this behaviour expected? I'm using systemd 216. > > I do see a similar problem in my code [0]. I do call sd_journal_previous() > after sd_journal_seek_tail(), but I still do see some older message come up. > > sd_journal_next() is the first I call in while loop. Perhaps even this is a > problem? > > [0] https://github.com/eworm-de/journal-notify/blob/master/journal-notify.c
Looks like I was right. For any reason sd_journal_next() can jump to old
journal entries (even if sd_journal_previous() has been called before). That
happens before sd_journal_wait() is called the first time.
Sadly I do not know how to reproduce. It happens very seldom and I could not
find the culprit so far.
--
main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH"
"CX:;",b;for(a/* Chris get my mail address: */=0;b=c[a++];)
putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}
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