Date: Sun, 3 Oct 2010 22:08:31 -0700 From: Garrett Cooper <gcooper@FreeBSD.org> To: Garrett Cooper <gcooper@freebsd.org> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: fcntl always fails to delete lock file, and PID is always -6464 Message-ID: <AANLkTikQqO2X3jw3xGXpzD6n0=z3LScFLb1qtWA76ZUi@mail.gmail.com> In-Reply-To: <AANLkTinZg3n3wDUzQFPv_Gq1o2hswGL3%2B4o0brmTi0-h@mail.gmail.com> References: <20101004123725.65d09b9e.daichi@ongs.co.jp> <AANLkTinZg3n3wDUzQFPv_Gq1o2hswGL3%2B4o0brmTi0-h@mail.gmail.com>
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On Sun, Oct 3, 2010 at 10:05 PM, Garrett Cooper <gcooper@freebsd.org> wrote: > On Sun, Oct 3, 2010 at 8:37 PM, Daichi GOTO <daichi@ongs.co.jp> wrote: >> It looks very strange. fcntl() always fails to delete lock file >> and command.l_pid is always -6464. This issue is disclosed in >> porting Google's Japanese input system called "mozc". >> >> details follow: >> http://code.google.com/p/mozc/issues/detail?id=40 >> >> % uname -a >> FreeBSD parancell.ongs.co.jp 9.0-CURRENT FreeBSD 9.0-CURRENT #6 r213257: Thu Sep 30 10:30:06 JST 2010 root@parancell.ongs.co.jp:/usr/obj/usr/src/sys/PARANCELL amd64 >> % >> >> My home directory on NFS server. Does anyone have any ideas? > > > I see some bad assumptions in the code: > > const int result = ::fcntl(*fd, F_SETLK, &command); > if (-1 == result) { // failed > ::close(*fd); > LOG(WARNING) << "already locked"; > return false; // another server is already running > } > > If the developer actually coded to POSIX expectations, he/she > would be checking for EACCES/EAGAIN; there are a myriad of other > issues that might be occurring with the software, as per my copy of > SUSv4 (see the ERRORS section of fcntl). I would print out the > strerror for that case. > Providing a backtrace of the application's execution and the > architecture and what version of FreeBSD you're using would be > helpful. > Thanks, > -Garrett > > PS Quickly looking over this code, it has portability issues assuming > that all Unix based OSes (that aren't under some Mac OSX guard) are > Linux, based on the number of /proc filesystem opens and reads I see > in the code. Sorry... missed some of the details in spite of the trees (FreeBSD version in particular). Thanks, -Garrett
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