Date: Sat, 9 Mar 2002 12:28:07 +0100 (CET) From: Slaven Rezic <eserte@vran.herceg.de> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/35703: /proc/curproc/file returns unknown Message-ID: <200203091128.g29BS7103320@vran.herceg.de>
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>Number: 35703
>Category: kern
>Synopsis: /proc/curproc/file returns unknown
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Mar 09 03:40:04 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Slaven Rezic
>Release: FreeBSD 4.3-STABLE i386
>Organization:
www.rezic.de
>Environment:
System: FreeBSD vran.herceg.de 4.3-STABLE FreeBSD 4.3-STABLE #6: Mon Jul 9 11:49:47 CEST 2001 root@vran.herceg.de:/vran/home/src/FreeBSD-4/src/sys/compile/VRAN i386
>Description:
Under some circumstances, the symbolic link
/proc/<anything>/file points to "unknown". In my experiments
it seems that this is the case if a directory is created
and/or removed in the as the executable and the executable is
called with a relative path. Some of the sysctl variables
vfs.cache.numfullpathfail[1-4] are increased.
This problem causes one test failure in perl5.7.3.
>How-To-Repeat:
Compile the program below:
----------------------------------------------------------------------
#include <unistd.h>
main() {
char buf[1024];
int len = readlink("/proc/curproc/file", buf, 1024);
if (!len) exit(1);
buf[len]=0;
printf("<%s>\n", buf);
}
----------------------------------------------------------------------
If run as ./a.out, it works OK.
However, if a subdirectory in the same directory is deleted,
then the program returns "unknown":
mkdir foo ; rmdir foo ; ./a.out
This works again:
mkdir foo ; rmdir foo ; `pwd`/a.out
>Fix:
???
>Release-Note:
>Audit-Trail:
>Unformatted:
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