Debian Bug report logs - #15092
libc6-dev: popen ()

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Ricardas Cepas <rch@pub.osf.lt>

To: submit@bugs.debian.org

Subject: libc6-dev: popen ()

Date: Fri, 21 Nov 1997 12:34:51 +0200

Package: libc6-dev
Version: 2.0.6-0.2


	popen() returns non NULL value even if command is not found.
This means all data send to such pipe will be discarded.

        Also it seems pipe opened with popen () is not closed on
exit, i.e. shell's prompt comes before program's output, unlike
the case when pclose() is invoked explicitly.

-- System Information
Debian Release: 1.3
Kernel Version: Linux rch 2.0.29 #1 Fri Mar 14 00:29:42 MET 1997 i486 unknown

Versions of the packages libc6-dev depends on:
libc6	Version: 2.0.6-0.2
gcc	Version: 2.7.2.3-3



-- 
                                      Ričardas Čepas

Message #10 received at 15092@bugs.debian.org (full text, mbox, reply):

From: Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de>

To: David Engel <david@sw.ods.com>, Ricardas Cepas <rch@pub.osf.lt>, 15092@bugs.debian.org

Subject: Re: Bug#15092: libc6-dev: popen ()

Date: 22 Nov 1997 02:35:04 +0100

> 	popen() returns non NULL value even if command is not found.
> This means all data send to such pipe will be discarded.
> 
>         Also it seems pipe opened with popen () is not closed on
> exit, i.e. shell's prompt comes before program's output, unlike
> the case when pclose() is invoked explicitly.

This is a long-standaing bug.  no Linux libc ever did this right.

glibc 2.1 will contain a fixed implementation but this isn't possible
for 2.0 without major rewrites.  I don't want to risk this for 2.0.
Instead I'll document this as a known bug.  To do this correct, please
send a format report using the glibcbug script.  Using the Debian
error reporting mechanisms is not enough and, David, please note this
in your docs.

Thanks,

-- Uli
---------------.      drepper at gnu.org  ,-.   Rubensstrasse 5
Ulrich Drepper  \    ,-------------------'   \  76149 Karlsruhe/Germany
Cygnus Solutions `--' drepper at cygnus.com   `------------------------

Message #15 received at submit@bugs.debian.org (full text, mbox, reply):

From: David Engel <david@sw.ods.com>

To: Ricardas Cepas <rch@pub.osf.lt>, submit@bugs.debian.org

Subject: Re: Bug#15092: libc6-dev: popen ()

Date: Fri, 21 Nov 1997 19:45:59 -0600

[Message part 1 (text/plain, inline)]

-- 
David Engel                        ODS Networks
david@sw.ods.com                   1001 E. Arapaho Road
(972) 234-6400                     Richardson, TX  75081

[Message part 2 (message/rfc822, inline)]

From: Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de>

To: David Engel <david@sw.ods.com>, Ricardas Cepas <rch@pub.osf.lt>, 15092@bugs.debian.org

Subject: Re: Bug#15092: libc6-dev: popen ()

Date: 22 Nov 1997 02:35:04 +0100

> 	popen() returns non NULL value even if command is not found.
> This means all data send to such pipe will be discarded.
> 
>         Also it seems pipe opened with popen () is not closed on
> exit, i.e. shell's prompt comes before program's output, unlike
> the case when pclose() is invoked explicitly.

This is a long-standaing bug.  no Linux libc ever did this right.

glibc 2.1 will contain a fixed implementation but this isn't possible
for 2.0 without major rewrites.  I don't want to risk this for 2.0.
Instead I'll document this as a known bug.  To do this correct, please
send a format report using the glibcbug script.  Using the Debian
error reporting mechanisms is not enough and, David, please note this
in your docs.

Thanks,

-- Uli
---------------.      drepper at gnu.org  ,-.   Rubensstrasse 5
Ulrich Drepper  \    ,-------------------'   \  76149 Karlsruhe/Germany
Cygnus Solutions `--' drepper at cygnus.com   `------------------------

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