Your message dated Thu, 11 Feb 2010 05:47:08 +0000
with message-id <[email protected]>
and subject line Bug#531078: fixed in socat 1.7.1.2-1
has caused the Debian Bug report #531078,
regarding socat: execs children with SIGCHLD ignored
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
531078: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=531078
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: socat
Version: 1.4.3.1-1
Severity: normal
Tags: patch
I don't currently know that I'm experiencing any symptom of this, other than a
warning generated by what I'm told is an obsolete warning flag to Perl.
mart...@whitewater:~$ perl -we 0
mart...@whitewater:~$ socat - EXEC:'perl -we 0'
Can't ignore signal CHLD, forcing to default.
mart...@whitewater:~$
Here's a demonstration with a more recent version of socat, unpatched then
patched:
mart...@whitewater:/tmp/socat-1.7.1.0$ /tmp/socat-1.7.1.0/socat - EXEC:'perl
-we 0'
Can't ignore signal CHLD, forcing to default.
mart...@whitewater:/tmp/socat-1.7.1.0$ patch -p0 < xio-progcall.c.patch
patching file xio-progcall.c
mart...@whitewater:/tmp/socat-1.7.1.0$ make
gcc -O -D_GNU_SOURCE -Wall -Wno-parentheses -DHAVE_CONFIG_H -I. -I. -c -o
xio-progcall.o xio-progcall.c
ar r libxio.a <snipped>
ranlib libxio.a
gcc -O -D_GNU_SOURCE -Wall -Wno-parentheses -DHAVE_CONFIG_H -I. -o socat
socat.o libxio.a -lutil -lssl
mart...@whitewater:/tmp/socat-1.7.1.0$ /tmp/socat-1.7.1.0/socat - EXEC:'perl
-we 0'
mart...@whitewater:/tmp/socat-1.7.1.0$
I fear there might be other symptoms, which is why I'm raising the bug.
My fears are based partly on:
In http://www.pasc.org/interps/unofficial/db/p1003.1/pasc-1003.1-132.html,
a "David Korn" (perhaps *the* Dave Korn) is quoted as having written:
A conforming application would not set SIGCHLD to SIG_IGN
since the standard leaves this behavior unspecified. An application
that does set SIGCHLD to SIG_IGN should set it back to SIG_DFL
before the call to exec.
In working on terminal emulators, I've seen a number of programs revert SIGCHLD
to SIG_DFL before calling exec(), generally without convincingly specifying
the reason. Perhaps the unspecified heritability of SIG_IGN is the reason.
I wonder why socat ignores SIGCHLD in the child. Perhaps it's for the case
where the child will then call system(). Then the SIG_IGN will affect socat
code as well as any child that inherits it. But system() waits for its child.
Perhaps this SIG_IGN is a relic of earlier efforts to prevent zombies.
More likely, I'm missing something.
-- System Information:
Debian Release: 4.0
APT prefers oldstable
APT policy: (500, 'oldstable'), (50, 'unstable')
Architecture: amd64 (x86_64)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-4-amd64
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL
set to en_US.UTF-8)
Versions of packages socat depends on:
ii libc6 2.3.6.ds1-13etch9 GNU C Library: Shared libraries
ii libreadline5 5.2-2 GNU readline and history libraries
ii libssl0.9.8 0.9.8c-4etch5 SSL shared libraries
ii libwrap0 7.6.dbs-13 Wietse Venema's TCP wrappers libra
socat recommends no packages.
-- no debconf information
--- xio-progcall.c.orig 2009-05-29 12:20:53.000000000 -0700
+++ xio-progcall.c 2009-05-29 12:24:43.000000000 -0700
@@ -414,8 +414,10 @@
gid_t group;
if (withfork) {
- if (Signal(SIGCHLD, SIG_IGN) == SIG_ERR) {
- Warn1("signal(SIGCHLD, SIG_IGN): %s", strerror(errno));
+ /* The child should have default handling for SIGCHLD. */
+ /* In particular, it's not defined whether ignoring SIGCHLD is inheritable. */
+ if (Signal(SIGCHLD, SIG_DFL) == SIG_ERR) {
+ Warn1("signal(SIGCHLD, SIG_DFL): %s", strerror(errno));
}
#if HAVE_PTY
--- End Message ---
--- Begin Message ---
Source: socat
Source-Version: 1.7.1.2-1
We believe that the bug you reported is fixed in the latest version of
socat, which is due to be installed in the Debian FTP archive:
socat_1.7.1.2-1.debian.tar.gz
to main/s/socat/socat_1.7.1.2-1.debian.tar.gz
socat_1.7.1.2-1.dsc
to main/s/socat/socat_1.7.1.2-1.dsc
socat_1.7.1.2-1_i386.deb
to main/s/socat/socat_1.7.1.2-1_i386.deb
socat_1.7.1.2.orig.tar.gz
to main/s/socat/socat_1.7.1.2.orig.tar.gz
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Chris Taylor <[email protected]> (supplier of updated socat package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Format: 1.8
Date: Wed, 10 Feb 2010 20:58:08 +0000
Source: socat
Binary: socat
Architecture: source i386
Version: 1.7.1.2-1
Distribution: unstable
Urgency: low
Maintainer: Chris Taylor <[email protected]>
Changed-By: Chris Taylor <[email protected]>
Description:
socat - multipurpose relay for bidirectional data transfer
Closes: 531078 553853 568100 569055 569184
Changes:
socat (1.7.1.2-1) unstable; urgency=low
.
* New maintainer (Closes: #569184).
* New upstream release (Closes: #568100).
- Fixes execs children with SIGCHLD ignored (Closes: #531078).
* Depend on libreadline-dev instead of libreadline5-dev (Closes: #553853).
* Mention support of sctp in package description (Closes: #569055).
* Use source format 3.0 (quilt).
* Bump compat to 7.
* Bump standards-version to 3.8.4
* Use quilt for patches and build-depend on quilt.
* Use new format for debian/copyright.
* Use dh7 for debian/rules.
* Add watch file.
* Add misc dep to depends.
* Update manpage in 00-Manpage.
- Port changes from previous versions.
- Fix lintian errors in manpage.
* Register documentation with doc-base.
* Override false-positive lintian warning.
Checksums-Sha1:
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Checksums-Sha256:
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socat_1.7.1.2-1_i386.deb
Files:
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2a5b7b0355421a039fb68b7541181b38 554091 net extra socat_1.7.1.2.orig.tar.gz
bad39003456a7083d0c6323b5f9e4ef7 10674 net extra socat_1.7.1.2-1.debian.tar.gz
9a32ee5f30b8ab34bde890642391fafa 358452 net extra socat_1.7.1.2-1_i386.deb
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--- End Message ---
