Bug#285352: marked as done (FIFO read doesn't block on SPARC)
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and subject line Bug#285352: Acknowledgement (FIFO read doesn't block on SPARC)
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>From jochen@scram.de Sun Dec 12 10:28:59 2004
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From: Jochen Friedrich <jochen@scram.de>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: FIFO read doesn't block on SPARC
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Date: Sun, 12 Dec 2004 19:28:47 +0100
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Package: libc6
Version: 2.3.2.ds1-19
Severity: normal
While debugging heartbeat on SPARC, i found a problem with FIFO reads
returning early in blocking mode. This sample demonstrates the problem
(reproducable on auric):
Do a "mknod /tmp/fifo -p" before running this:
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main()
{
int fiforfd, i;
FILE * fifo;
int flags;
char buf[1000];
char * getsret;
fiforfd = open("/tmp/fifo", O_RDONLY|O_NDELAY|O_NONBLOCK);
i = open("/tmp/fifo", O_WRONLY);
flags = fcntl(fiforfd, F_GETFL);
flags &= ~O_NONBLOCK;
fcntl(fiforfd, F_SETFL, flags);
fifo = fdopen(fiforfd, "r");
getsret = fgets(buf, sizeof(buf), fifo);
printf("%s\n", buf);
}
On Intel, it will just block (as expected), but on SPARC it immediately
returns.
-- System Information:
Debian Release: 3.1
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing')
Architecture: sparc
Kernel: Linux 2.4.27-1-sparc32-smp
Locale: LANG=de_DE@euro, LC_CTYPE=de_DE@euro (charmap=ISO-8859-15)
Versions of packages libc6 depends on:
ii libdb1-compat 2.1.3-7 The Berkeley database routines [gl
-- no debconf information
---------------------------------------
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>From jochen@scram.de Sun Dec 12 11:03:06 2004
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Date: Sun, 12 Dec 2004 20:02:15 +0100 (CET)
From: Jochen Friedrich <jochen@scram.de>
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To: 285352-done@bugs.debian.org
Subject: Re: Bug#285352: Acknowledgement (FIFO read doesn't block on SPARC)
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Supid me,
O_NONBLOCK == O_NDELAY on Intel, but not on SPARC!
Sample fixed, and working!
Sorry for the confusion. Bug will be opened for heartbeat instead ;)
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