From:
Operating system: CentOS 5.5
PHP version: 5.3.3
Package: PCNTL related
Bug Type: Bug
Bug description:No SIGCHLD signal received
Description:
------------
The included CLI test script forks a child process and should terminate
when the child process finishes after two seconds with the message that
SIGCHLD signal (17) was received. This works as expected on my Fedora
system with PHP 5.3.3-1 installed, but the process never receives SIGCHLD
on my CentOS system with identically built PHP 5.3.3-1.
The configure line for the CentOS system is the one below, the Fedora one
is the same except for some differences in paths but not options:
'./configure' '--build=x86_64-redhat-linux-gnu'
'--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu'
'--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr'
'--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc'
'--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64'
'--libexecdir=/usr/libexec' '--localstatedir=/var'
'--sharedstatedir=/usr/com' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--cache-file=../config.cache'
'--with-libdir=lib64' '--with-config-file-path=/etc'
'--with-config-file-scan-dir=/etc/php.d' '--disable-debug' '--with-pic'
'--disable-rpath' '--without-pear' '--with-bz2' '--with-exec-dir=/usr/bin'
'--with-freetype-dir=/usr' '--with-png-dir=/usr' '--with-xpm-dir=/usr'
'--enable-gd-native-ttf' '--with-t1lib=/usr' '--without-gdbm'
'--with-gettext' '--with-gmp' '--with-iconv' '--with-jpeg-dir=/usr'
'--with-openssl' '--with-pcre-regex=/usr' '--with-zlib' '--with-layout=GNU'
'--enable-exif' '--enable-ftp' '--enable-magic-quotes' '--enable-sockets'
'--enable-sysvsem' '--enable-sysvshm' '--enable-sysvmsg' '--with-kerberos'
'--enable-ucd-snmp-hack' '--enable-shmop' '--enable-calendar'
'--with-libxml-dir=/usr' '--enable-xml' '--with-apxs2=/usr/sbin/apxs'
'--without-mysql' '--without-gd' '--disable-dom' '--disable-dba'
'--without-unixODBC' '--disable-pdo' '--disable-xmlreader'
'--disable-xmlwriter' '--without-sqlite' '--without-sqlite3'
'--disable-phar' '--disable-fileinfo' '--disable-json' '--without-pspell'
'--disable-wddx' '--without-curl' '--disable-posix' '--disable-sysvmsg'
'--disable-sysvshm' '--disable-sysvsem'
I rebuilt the CentOS PHP with explicit option --disable-sigchld but that
didn't help, it is the default after all.
Test script:
---------------
<?php
if (($pid = pcntl_fork()) === 0)
usleep(2000000);
else if ($pid !== -1)
{
$signals = array(SIGINT, SIGCHLD);
pcntl_sigprocmask(SIG_BLOCK, $signals, $prevSignals);
$signal = pcntl_sigwaitinfo($signals, $info);
echo "received signal ${signal}\n";
}
Expected result:
----------------
> php test.php
received signal 17
Actual result:
--------------
> php test.php
process runs forever until SIGINT is received (CTRL+C), the child process
is defunct after two seconds
--
Edit bug report at http://bugs.php.net/bug.php?id=52992&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=52992&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=52992&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=52992&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=52992&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=52992&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=52992&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=52992&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=52992&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=52992&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=52992&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=52992&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=52992&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=52992&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=52992&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=52992&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=52992&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=52992&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=52992&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=52992&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=52992&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=52992&r=mysqlcfg
