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Subject: | Re: MC no longer working with cygwin 3.1.x |
To: | cygwin AT cygwin DOT com |
References: | <DB8PR01MB5996973955794728D12078E6BC530 AT DB8PR01MB5996 DOT eurprd01 DOT prod DOT exchangelabs DOT com> <97c8a719-73b9-e0ec-9651-97c2c684a086 AT gmail DOT com> <20191218193205 DOT GP10310 AT calimero DOT vinschen DOT de> <c3809f52-1842-83d6-6692-53f6caec3491 AT cornell DOT edu> |
From: | Thomas Wolff <towo AT towo DOT net> |
Message-ID: | <e79cd247-c573-3c27-6636-c6d9a32447a4@towo.net> |
Date: | Wed, 18 Dec 2019 23:55:16 +0100 |
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Am 18.12.2019 um 22:14 schrieb Ken Brown: > On 12/18/2019 2:32 PM, Corinna Vinschen wrote: >> On Dec 18 17:23, Marco Atzeri wrote: >>> Am 18.12.2019 um 15:42 schrieb Laurent R: >>>> Dear all, >>>> >>>> After the update to cygwin-3.1.1, mc (aka Midnight Commander) no longer starts. It goes into an infinite loop, if I go back to cygwin-3.0.7, mc works perfectly. >>>> >>>> I tested with cygwin-3.1.0, same problem. >>>> >>>> The MC version is 4.8.23 and the operating system is Windows 10 Pro x64 1903. >>>> >>>> Regards. >>>> >>> confirmed >>> >>> there must be a race somewhere as running /usr/bin/mc.exe from strace >>> works fine. >> But that's not the only problem running mc AFAICS. I'm seeing an >> error message in the background: >> >> Cannot open named pipe /tmp/mc-corinna/mc.pipe.384 >> /cygdrive/d/cyg_pub/devel/mc/mc-4.8.23-1.x86_64/src/mc-4.8.23/src/subshell/common.c: open: Permission denied >> >> It looks like there's another problem, this time with the new FIFO >> code. >> >> Ken, care to take a look? > I've just looked at the mc source code, and it seems that (under tcsh only), mc > creates a fifo and tries to open it twice as O_RDWR. This is not supported on > Cygwin, so the second attempt fails. > > Here's the relevant code from src/subshell/common.c: > > if (mc_global.shell->type == SHELL_TCSH) > { > g_snprintf (tcsh_fifo, sizeof (tcsh_fifo), "%s/mc.pipe.%d", > mc_tmpdir (), (int) getpid ()); > if (mkfifo (tcsh_fifo, 0600) == -1) > [...] > /* Opening the FIFO as O_RDONLY or O_WRONLY causes deadlock */ > > if ((subshell_pipe[READ] = open (tcsh_fifo, O_RDWR)) == -1 > || (subshell_pipe[WRITE] = open (tcsh_fifo, O_RDWR)) == -1) > { > fprintf (stderr, _("Cannot open named pipe %s\n"), tcsh_fifo); > perror (__FILE__ ": open"); > mc_global.tty.use_subshell = FALSE; > [...] > > Under bash, zsh, and some other shells, mc uses ordinary pipes rather than > FIFOs. I have no idea why tcsh is treated differently. > > Until someone[*] gets around to making it possible to open a FIFO twice for > reading, I don't think there's anything we can do about it. I also don't know > how important this is for mc. I don't use tcsh or mc, so I can't judge. I've reproduced mc to fail, from bash, in cygwin 3.1.0 and 3.1.1, Windows 1809 and 1903. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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