note 81230 added to ref.sem

I've had a devil of a time interfacing with non-PHP declared shared memory. DO NOT do this unless you read the php-X.X.X/ext/sysvshm/ code directly. Non-PHP programs need to use exactly the same "shared memory" struct as PHP uses, otherwise this "system V standard" call doesn't work. Here are the specific deviations from the System-V C-calls: <? $shmkey = ftok($shmkey_path, $shmkey_proj_id); ?> In C the $shmkey_proj_id is an int, but in PHP it's a char* to a single char. This means that your C program is restricted to using 0-255 (in PHP chr(0) through chr(255)) for project ID's, if it used anything else then you have to re-write your C-routine. <? $var = shm_get_var($shm_id, 0); $fail = shm_put_var($shm_id, 0, $var1 ) ?> There are no such things as a system V calls like this at all. In system V you simply have a pointer to the beginning of your shared memory segment after attaching, so as long as you offset to the right spot you get what you want. In PHP, shared memory is ONLY cast as a struct, and the "data" is serialized as a string in the "mem" portion of the struct: <? //C code typedef struct { long key; long length; long next; char mem; } sysvshm_chunk; ?> If your C program didn't use this struct you need to re-write it to use this struct and write everything as a string. This is rather absurd, as the purpose of shared memory is to communicate quickly with other programs resident in memory. But it is what it is. ---- Server IP: 64.71.164.2 Probable Submitter: 206.169.62.98 ---- Manual Page -- http://www.php.net/manual/en/ref.sem.php Edit -- https://master.php.net/note/edit/81230 Del: integrated -- https://master.php.net/note/delete/81230/integrated Del: useless -- https://master.php.net/note/delete/81230/useless Del: bad code -- https://master.php.net/note/delete/81230/bad+code Del: spam -- https://master.php.net/note/delete/81230/spam Del: non-english -- https://master.php.net/note/delete/81230/non-english Del: in docs -- https://master.php.net/note/delete/81230/in+docs Del: other reasons-- https://master.php.net/note/delete/81230 Reject -- https://master.php.net/note/reject/81230 Search -- https://master.php.net/manage/user-notes.php