Any updates on this guys ? Thanks Ayappan P > On 08-Jan-2019, at 12:03 PM, Ayappan P2 wrote: > > > Now the poll() solution is working in AIX, will there be any official patch > for this ? > > It will be great to have this integrated into the next release. > > Thanks > Ayappan P > > > > > From: "Ayappan P2" > To: "Pádraig Brady" > Cc: 33946@debbugs.gnu.org, Bernhard Voelker > , Bug-coreutils > > Date: 01/07/2019 02:37 PM > Subject: bug#33946: tail -f stops abruptly in AIX when piped. > Sent by: "Bug-coreutils" +ayappap2=in.ibm.com@gnu.org> > > > > > The poll() solution is working in AIX. Great. > > Thanks > Ayappan P > > > > From: "Pádraig Brady" > To: Ayappan P2 , Bernhard Voelker > > Cc: 33946@debbugs.gnu.org > Date: 01/04/2019 11:37 PM > Subject: bug#33946: tail -f stops abruptly in AIX when piped. > Sent by: "Bug-coreutils" +ayappap2=in.ibm.com@gnu.org> > > > >> On 03/01/19 23:01, Ayappan P2 wrote: >> >> The problem happens only when we pipe the output of "tail -f" . >> >> I am not sure how one can take the truss of "/tail -f test_file | grep >> 123" . >> >> I did little debugging on the tail code. This function > "check_output_alive" >> introduced by the commit (mentioned earlier in the thread) sents SIGPIPE >> after doing a select () call in AIX. >> And that makes it exit immediately. >> >> fd_set rfd; >> FD_ZERO (&rfd); >> FD_SET (STDOUT_FILENO, &rfd); >> >> /* readable event on STDOUT is equivalent to POLLERR, >> and implies an error condition on output like broken pipe. */ >> if (select (STDOUT_FILENO + 1, &rfd, NULL, NULL, &delay) == 1) >> raise (SIGPIPE); >> } >> >> I didn't understand the real reason behind this commit. >> >> Thanks >> Ayappan P >> >> >> >> From: Bernhard Voelker >> To: Ayappan P2 , > 33946@debbugs.gnu.org >> Date: 01/03/2019 11:53 PM >> Subject: bug#33946: tail -f stops abruptly in AIX > when piped. >> Sent by: "Bug-coreutils" > +ayappap2=in.ibm.com@gnu.org> >> >> >> >> On 1/3/19 6:39 PM, Ayappan P2 wrote: >>>> On 01-Jan-2019, at 10:36 PM, Ayappan P2 wrote: >>>> Hi, >>>> >>>> I am running coreutils 8.30 in AIX machine and it seems like "tail -f" >> is >>>> not working as it used to be when the output is piped. >>>> >>>> # ./tail -f test_file | grep 123 >>>> >>>> (1) root @ aixoss-automation-3: 6.1.0.0: / >>>> >>>> It stops immediately and it seems like this commit >>>> >>>> >> > https://github.com/coreutils/coreutils/commit/ce0415fda108b7ec35181118fd7a2c9ee70331ee > > >> >>>> >>>> has introduce this behavior. >>>> >>>> I checked in Linux with coreutils 8.30 where it works as like earlier >>>> versions. >>>> >>>> Thanks >>>> Ayappan P >> >>> Anyone has any idea on this issue ? >>> >>> Thanks >>> Ayappan P >> >> Thanks for reporting. >> It's hard (at least for me) to get hold on to an AIX system, >> so would you post a trace file (from 'truss'), please? >> >> Second, is this specific to a certain AIX version? >> >> BTW: our tests should have caught this before the release. >> Do you also get an error during 'make check'? > > Our tests were incorrect :/ > > Note the need for this extra check was discussed at: > https://lists.gnu.org/archive/html/coreutils/2017-06/msg00010.html > > > > Note the initial implementation there was with poll() > rather than select(). That may work better on AIX. > Could you try the poll() solution at the above link, > on your system? > > Attached is a fixup for the test and an avoidance > of the issue on AIX. > > cheers, > Pádraig. > [attachment "tail-aix.patch" deleted by Ayappan P2/India/IBM] > > [attachment "graycol.gif" deleted by Ayappan P2/India/IBM] > >