Date: Wed, 26 Nov 2003 17:40:20 -0800 (PST) From: Jean-Yves Lefort <jylefort@brutele.be> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/35377: process gets unkillable (-9) in "ttywai" state Message-ID: <200311270140.hAR1eKrC031247@freefall.freebsd.org>
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The following reply was made to PR kern/35377; it has been noted by GNATS.
From: Jean-Yves Lefort <jylefort@brutele.be>
To: freebsd-gnats-submit@FreeBSD.org, yuri@tsoft.com
Cc:
Subject: Re: kern/35377: process gets unkillable (-9) in "ttywai" state
Date: Thu, 27 Nov 2003 02:35:19 +0100
The problem should probably be fixed in the kernel, but I developed a
workaround:
--- start of ttyflush.c ---
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
int
main (int argc, char **argv)
{
int fd;
int what = FWRITE;
if (argc != 2)
{
printf("Usage: %s TERMINAL_DEVICE\n", argv[0]);
exit(1);
}
fd = open(argv[1], O_RDONLY);
if (fd == -1)
{
fprintf(stderr, "Unable to open terminal device %s: %s\n",
argv[1], strerror(errno));
exit(1);
}
if (ioctl(fd, TIOCFLUSH, &what) == -1)
{
fprintf(stderr, "ioctl() error: %s\n", strerror(errno));
exit(1);
}
if (close(fd) == -1)
{
fprintf(stderr, "Unable to close terminal device: %s\n",
strerror(errno));
exit(1);
}
return 0;
}
--- end of ttyflush.c ---
Compile it, and use it this way:
1) Get the pseudo-terminal device of the offending process:
$ ps axww | grep irssi
87545 p1- IEs+ 0:00.24 irssi
$
In this case, it's /dev/ttyp1
2) Flush the output queue, using the above program:
./ttyflush /dev/ttyp1
That'll allow the process to exit.
Regards,
Jean-Yves Lefort
--
Jean-Yves Lefort
jylefort@brutele.be
http://lefort.be.eu.org/
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