Date: Wed, 28 May 2003 13:23:46 -0500 From: Derek Young <bleach@orcacom.net> To: Mike Makonnen <mtm@identd.net> Cc: cvs-src@FreeBSD.org Subject: Re: cvs commit: src/lib/libthr/thread thr_join.c Message-ID: <200305281323.46880.bleach@orcacom.net> In-Reply-To: <20030528074607.PASI4805.out003.verizon.net@kokeb.ambesa.net> References: <20030527214357.CE12C37B48F@hub.freebsd.org> <20030527185552.258336eb.ak03@gte.com> <20030528074607.PASI4805.out003.verizon.net@kokeb.ambesa.net>
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I use FreeBSD 4.8 STABLE and KDE 3.1.2 and I get the same error message about the cannot chown /dev/tty blah blah blah. I don't get crashes though. Interesting enough the DRM-DRI people were talking about konsole also did something weird which prevents x server being ran more than once when the DRM is enabled. Which is the case on my laptop, I have to reboot if I want to run X twice. Snicker. Something about the font handling... Maybe you should talk to anholt@freebsd and see if you problems are somewhat related? I could be totally offbase, but you never know. Derek Young On Wednesday 28 May 2003 02:46 am, Mike Makonnen wrote: > On Tue, 27 May 2003 18:55:52 -0400 > > Alexander Kabaev <ak03@gte.com> wrote: > > konsole has similar problems when run with libkse. The ktrace + source > > code inspection convinced me that it simply abort()'a itself, because > > ttyname() function returns NULL in makePty() function. > > Yes, seems like it. More comments below. > > > I do not think either threading library has anything to do with the > > failure. > > It doesn't look like it's a threading issue, but since libc_r doesn't bring > out this behaviour in Konsole, they must be doing (or not doing) something > (directly or indirectly) that triggers it. > > I have finally taken the plunge and installed KDE, and I can reproduce the > bug. However, it is unclear to me exactly what the problem is. To > complicate things even further it doesn't even look look Konsole uses > threads, and instead plays games with fork(2). I think we need someone who > is familiar with the code to help out because I am having a hard time > following it. Just to add a couple of data points: > > It crashes because tcgetattr(3) called from libc/ttyname_unthreaded() > returns ENOTTY to TEPty::makePty(). > > When it does crash it is also usually preceded by: > konsole: cannot chown /dev/ttypc. > Reason: Operation not permitted > which is as a result of this code snippet from TEPty.cpp:openPty() > > if (openpty(&master_fd, &slave_fd, NULL, NULL, NULL) == 0) { > m_MasterFd = master_fd; > m_SlaveFd = slave_fd; > #ifdef HAVE_PTSNAME > strncpy(ptynam, ptsname(master_fd), 50); > ... > [snip] > ... > if (fchown(slave_fd, (uid_t) -1, gid) < 0) > { > m_bNeedGrantPty = true; > fprintf(stderr,"konsole: cannot chown %s.\n",ttynam); > perror("Reason"); > } > > > The fact that it works sometimes and abort()s at others suggests that there > may be a race somewhere, but where... > > Cheers.
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