Date: Mon, 6 Sep 1999 00:18:01 -0700 (PDT) From: tarkhil@asteroid.svib.ru To: freebsd-gnats-submit@freebsd.org Subject: kern/13593: Problems with FIFO and select Message-ID: <19990906071801.397DE1520F@hub.freebsd.org>
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>Number: 13593
>Category: kern
>Synopsis: Problems with FIFO and select
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon Sep 6 00:20:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: Alex Povolotsky
>Release: 3.2-STABLE
>Organization:
>Environment:
FreeBSD shuttle.svib.ru 3.0-19990619-STABLE FreeBSD 3.0-19990619-STABLE #0: Thu Jun 24 21:26:37 MSD 1999 root@shuttle.svib.ru:/mnt/usr/src/sys/compile/SHUTTLE i386
>Description:
Attempt to open FIFO file with O_WRONLY|O_NONBLOCK results in Device not configured error.
However, when FIFO is opened with O_RDWR and O_NONBLOCK, every attempt
to select(2) its handler for writing doesn't wait until someone opens
FIFO for reading, but instead FIFO is ready to write at every select.
>How-To-Repeat:
#include <stdio.h>
#include <fcntl.h>
main() {
int control;
if ((control = open("STATUS",O_WRONLY|O_NONBLOCK))<0) {
perror("Could not open STATUS ");
exit(1);
}
printf("STATUS ready\n");
close(control);
return(0);
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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