Date: Tue, 8 Nov 2011 16:57:50 GMT From: Yui NARUSE <naruse@airemix.jp> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/162379: When select(2) closed writing pipe, it will sticks. Message-ID: <201111081657.pA8GvoNR046708@red.freebsd.org> Resent-Message-ID: <201111081700.pA8H0P5c070581@freefall.freebsd.org>
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>Number: 162379
>Category: kern
>Synopsis: When select(2) closed writing pipe, it will sticks.
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Nov 08 17:00:25 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator: Yui NARUSE
>Release: FreeBSD 8.2
>Organization:
>Environment:
FreeBSD freebsd82-64 8.2-RELEASE-p3 FreeBSD 8.2-RELEASE-p3 #0: Tue Sep 27 18:45:57 UTC 2011 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
When select(2) closed writing pipe, it will sticks.
FreeBSD 9.0-RC1 also reproduces this.
>How-To-Repeat:
Run following program, it will sticks.
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/select.h>
#define max(x,y) ((x > y) ? x : y)
int
main(void) {
int pipes[2];
int res = pipe(pipes);
if (res != 0) abort();
int r = pipes[0];
int w = pipes[1];
res = close(w);
if (res != 0) abort();
fd_set readfds; FD_ZERO(&readfds);
fd_set writefds; FD_ZERO(&writefds);
fd_set exceptfds; FD_ZERO(&exceptfds);
FD_SET(w, &writefds);
res = select(max(r,w)+1, &readfds, &writefds, &exceptfds, NULL);
if (res) perror("select");
return 0;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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