Date: Thu, 4 Feb 1999 03:20:54 -0800 (PST) From: steve@spvi.com To: freebsd-gnats-submit@FreeBSD.ORG Subject: misc/9903: thread enabled program can't use popen/system more than once when called from cron Message-ID: <199902041120.DAA26930@hub.freebsd.org>
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>Number: 9903
>Category: misc
>Synopsis: thread enabled program can't use popen/system more than once when called from cron
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Feb 4 03:30:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Steve Spicklemire
>Release: 2.2.8-STABLE
>Organization:
Silicon Prairie Ventures Inc
>Environment:
FreeBSD acer.spvi.com 2.2.8-RELEASE FreeBSD 2.2.8-RELEASE #0: Mon Feb 1 06:13:17 EST 1999 steve@acer.spvi.com:/usr/src/sys/compile/MYKERNEL i386
>Description:
When a thread enabled program (linked to libc_r) is run from
cron, it will block on the second call to system/popen.
>How-To-Repeat:
Compile this program:
gcc -pthread -g -o problem problem.c
---------------------------------------------------
#include <stdio.h>
main()
{
printf("before touching one....\n");
fflush(stdout);
system("touch /tmp/one.txt");
system("touch /tmp/two.txt");
printf("after touching two.....\n");
fflush(stdout);
}
-----------------------------
run from cron... observe.
program blocks in thread_sys_select().
>Fix:
don't run thread enabled programs that call system/popen from cron.
>Release-Note:
>Audit-Trail:
>Unformatted:
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