Hi!
I have a server written in C++ and my webpages are in PHP. The PHP has
to communicate with the server using shared memory. This was working
fine on the server running FC-1 with php-4.3.8. We recently migrated
to CentOS 4.1 (Equivalent to RHEL 4.1) running php-4.3.9. The error it
displays is as follows:
shmop_open(): unable to attach or create shared memory segment in
/var/www/html/sharedmem.php on line 2
The server opens the shm in 666 (originally was 644) even then it was
not working. I can see the shared mem open using 'ipcs' command.
The source code of PHP is as follows:
<?php
/*Sem Key is read from this file*/
$SEMROUTE = "/var/www/html/sharedmem/";
$filename = $SEMROUTE."id";
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));
fclose($handle);
$contents = chop($contents);
$shm_key = $contents;
/*DEBUG:: The Contents of the file*/
print $shm_key."<br>"; // These are fine
# print $shm_key;
$shm_id = shmop_open($shm_key, "a",0,0) or die("FATAL ERROR:: Unable
to Access Shared Memory");
/*$shm_size = shmop_size($shm_id);
DEBUG:: print ("Shared Memory Block Size: " . $shm_size."\n");
*/
// Now lets read the string back
$data = shmop_read($shm_id, 0, $shm_size);
if (!$data) {
echo "FATAL ERROR:: Couldn't read from shared memory\n";
exit;
}
?>
The PHPInfo of the servers are as follows (if it will help):
----------------- Server where its working fine ---------
-- Start --
'./configure' '--host=i386-redhat-linux' '--build=i386-redhat-linux'
'--target=i386-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/lib' '--libexecdir=/usr/libexec' '--localstatedir=/var'
'--sharedstatedir=/usr/com' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--cache-file=../config.cache'
'--with-config-file-path=/etc'
'--with-config-file-scan-dir=/etc/php.d' '--enable-force-cgi-redirect'
'--disable-debug' '--enable-pic' '--disable-rpath'
'--enable-inline-optimization' '--with-bz2' '--with-db4=/usr'
'--with-curl' '--with-exec-dir=/usr/bin' '--with-freetype-dir=/usr'
'--with-png-dir=/usr' '--with-gd' '--enable-gd-native-ttf'
'--without-gdbm' '--with-gettext' '--with-ncurses' '--with-gmp'
'--with-iconv' '--with-jpeg-dir=/usr' '--with-openssl' '--with-png'
'--with-pspell' '--with-regex=system' '--with-xml'
'--with-expat-dir=/usr' '--with-dom=shared,/usr'
'--with-dom-xslt=/usr' '--with-dom-exslt=/usr' '--with-xmlrpc=shared'
'--with-pcre-regex=/usr' '--with-zlib' '--with-layout=GNU'
'--enable-bcmath' '--enable-exif' '--enable-ftp'
'--enable-magic-quotes' '--enable-safe-mode' '--enable-sockets'
'--enable-sysvsem' '--enable-sysvshm' '--enable-discard-path'
'--enable-track-vars' '--enable-trans-sid' '--enable-yp'
'--enable-wddx' '--without-oci8' '--with-pear=/usr/share/pear'
'--with-imap=shared' '--with-imap-ssl' '--with-kerberos'
'--with-ldap=shared' '--with-mysql=shared,/usr' '--with-pgsql=shared'
'--with-snmp=shared,/usr' '--with-snmp=shared'
'--enable-ucd-snmp-hack' '--with-unixODBC=shared'
'--enable-memory-limit' '--enable-bcmath' '--enable-shmop'
'--enable-calendar' '--enable-dbx' '--enable-dio' '--enable-mcal'
'--enable-mbstring=shared' '--enable-mbstr-enc-trans'
'--enable-mbregex' '--with-apxs2=/usr/sbin/apxs'
-- End --
----------------- Config of Server on which it Fails ---------
-- Start --
'./configure' '--build=i686-redhat-linux-gnu'
'--host=i686-redhat-linux-gnu' '--target=i386-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/lib'
'--libexecdir=/usr/libexec' '--localstatedir=/var'
'--sharedstatedir=/usr/com' '--mandir=/usr/share/man'
'--infodir=/usr/share/info' '--cache-file=../config.cache'
'--with-config-file-path=/etc'
'--with-config-file-scan-dir=/etc/php.d' '--enable-force-cgi-redirect'
'--disable-debug' '--enable-pic' '--disable-rpath'
'--enable-inline-optimization' '--with-bz2' '--with-db4=/usr'
'--with-curl' '--with-exec-dir=/usr/bin' '--with-freetype-dir=/usr'
'--with-png-dir=/usr' '--with-gd=shared' '--enable-gd-native-ttf'
'--without-gdbm' '--with-gettext' '--with-ncurses=shared' '--with-gmp'
'--with-iconv' '--with-jpeg-dir=/usr' '--with-openssl' '--with-png'
'--with-pspell' '--with-xml' '--with-expat-dir=/usr'
'--with-dom=shared,/usr' '--with-dom-xslt=/usr'
'--with-dom-exslt=/usr' '--with-xmlrpc=shared'
'--with-pcre-regex=/usr' '--with-zlib' '--with-layout=GNU'
'--enable-bcmath' '--enable-exif' '--enable-ftp'
'--enable-magic-quotes' '--enable-sockets' '--enable-sysvsem'
'--enable-sysvshm' '--enable-track-vars' '--enable-trans-sid'
'--enable-yp' '--enable-wddx' '--with-pear=/usr/share/pear'
'--with-imap=shared' '--with-imap-ssl' '--with-kerberos'
'--with-ldap=shared' '--with-mysql=shared,/usr' '--with-pgsql=shared'
'--with-snmp=shared,/usr' '--with-snmp=shared'
'--enable-ucd-snmp-hack' '--with-unixODBC=shared,/usr'
'--enable-memory-limit' '--enable-shmop' '--enable-calendar'
'--enable-dbx' '--enable-dio' '--enable-mbstring=shared'
'--enable-mbstr-enc-trans' '--enable-mbregex'
'--with-mime-magic=/usr/share/file/magic.mime'
'--with-apxs2=/usr/sbin/apxs'
-- End --
Both the config say that 'shmop' is enabled.
Can some one help me with this, I am in desperate need of this, if
this fails I might have to search for an alternative and the project
has to go live in a week or so. I am in desperate need of help, can
any one help pls?
Regards,
Yaswanth
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