[PHP-DEV] Create a class variable in extension?

[phpdev]

Hello,

1. I have been able to create a class within my extension, but am unable
to create a class variable that can be used throughout the class
methods. This class variable needs to be an array. Below is how I would
write the class in php.
class foo {
  var $foo = array();

  functions...
}

2. How can you create a constructor for your class in an extension that
loads when somebody calls $var = new foo();? Below is what I mean in php
classes:
class foo {
   function foo() {
   ...
   }
}


Thanks for any help,
Daniel Simser
[EMAIL PROTECTED]


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[PHP-DEV] Bug #10656: shmop_open permissions incorrect for writing

[phpdev]

From: [EMAIL PROTECTED]
IP Address:   203.48.38.170
Operating system: FreeBSD 4.3 (i386)
PHP version:  4.0.5
PHP Bug Type: Unknown/Other Function
Bug description:  shmop_open permissions incorrect for writing

Basically, the shmop_open function does not allow for writing to shared memory if 
pre-allocated memory is opened using the ACCESS (rather than CREATE) mode. This was 
found when using the shmop functions for fast interprocess communication between a 
number of php cgi scripts. The solution to this bug was to create another mode, WRITE 
(w) that uses IPC_R  IPC_W shm flags.

To reproduce the problem:-

# ** BEFORE fix modifications are made **
# ** change to php cgi directory and run server command (C) in one telnet session then 
run client command (A) in another. Client cannot write!
echo '? $id = shmop_open(0xff00, c, 777, 1000); print Server:  Got ID\n; 
shmop_write($id, Hello, 0); sleep(5); $in = shmop_read($id, 0,5); print Server:  
Got \$in\ back from client!\n; ?' | ./php -q 
echo '? $id = shmop_open(0xff00, a, 0,0); print ClientA: Got ID: $id\n; $in = 
shmop_read($id, 0,5); print ClientA: Got \$in\ from server!\n; $bytes = 
shmop_write($id, $text = aMode, 0); print ClientA: Wrote $text to server! ($bytes 
bytes)\n; sleep(12); print \n\n; ?' | ./php -q

# ** shmop_open in ACCESS mode does not allow writing to shared memory!
# ** So, I created a WRITE (w) mode to allow writing and left ACCESS (a) mode as 
read_only.

# ** AFTER fix modifications are made **
# ** change to php cgi directory and run server command (C) in one telnet session then 
run new client command (W) in another. Client can now write.
echo '? $id = shmop_open(0xff00, c, 777, 1000); print Server:  Got ID\n; 
shmop_write($id, Hello, 0); sleep(5); $in = shmop_read($id, 0,5); print Server:  
Got \$in\ back from client!\n; ?' | ./php -q 
echo '? $id = shmop_open(0xff00, w, 0,0); print ClientW: Got ID: $id\n; $in = 
shmop_read($id, 0,5); print ClientW: Got \$in\ from server!\n; $bytes = 
shmop_write($id, $text = wMode, 0); print ClientW: Wrote $text to server! ($bytes 
bytes)\n; sleep(12); print \n\n; ?' | ./php -q

# ** Modifications required for bug fix, include changing ext/shmop.c

Existing /ext/shmop.c [shmop_open()]:

/* {{{ proto int shmop_open (int key, int flags, int mode, int size)
   gets and attaches a shared memory segment */
PHP_FUNCTION(shmop_open)
{
...
if (memchr((*flags)-value.str.val, 'a', (*flags)-value.str.len)) {
shmflg = SHM_RDONLY;
shmop-shmflg |= IPC_EXCL;
}
else if (memchr((*flags)-value.str.val, 'c', 
(*flags)-value.str.len)) {
shmop-shmflg |= IPC_CREAT;
shmop-size = (*size)-value.lval;
}
else {
php_error(E_WARNING, shmopen: access mode invalid);
efree(shmop);
RETURN_FALSE;
}

shmop-shmid = shmget(shmop-key, shmop-size, shmop-shmflg);
if (shmop-shmid == -1) {
php_error(E_WARNING, shmopen: can't get the block);
efree(shmop);
RETURN_FALSE;
}
...
}
/* }}} */

Corrected /ext/shmop.c [shmop_open()]:

/* {{{ proto int shmop_open (int key, int flags, int mode, int size)
   gets and attaches a shared memory segment */
PHP_FUNCTION(shmop_open)
{
...
if (memchr((*flags)-value.str.val, 'a', (*flags)-value.str.len)) {
shmflg = SHM_RDONLY;
shmop-shmflg |= IPC_EXCL;
}
else if (memchr((*flags)-value.str.val, 'c', 
(*flags)-value.str.len)) {
shmop-shmflg |= IPC_CREAT;
shmop-size = (*size)-value.lval;
}
else if (memchr((*flags)-value.str.val, 'w', 
(*flags)-value.str.len)) {
shmop-shmflg |= IPC_R;
shmop-shmflg |= IPC_EXCL;
shmop-shmflg |= IPC_W;
}
else {
php_error(E_WARNING, shmopen: access mode invalid);
efree(shmop);
RETURN_FALSE;
}
...
}
/* }}} */

# * Configuration lines for php_4.0.5.tar.gz compiling
./configure --enable-memory-limit=yes --enable-sockets --with-openssl 
--enable-shmop --enable-debug=no --enable-xml --enable-ftp 
--with-config-file-path=/etc --with-mysql=/usr/local/ 
--with-sybase=/usr/local/freetds/ --enable-dba=yes --with-gdbm=/usr/local/ 
--with-mhash=/usr/local/ --with-curl=/usr/local/ --with-zlib=/usr/local/ 
--with-gd=/usr/local/
# Search/replace required for freetds implementation
perl -pi -e 's/dbopen/tdsdbopen/g;