Hi all, I'm having some issues with some custom embedding of the PHP sapi. I'm trying to call PHP from Ruby and I'd like to be able to pass data back and forth freely, but I'm running into segfaults. It works well enough for small values, but for some large values, it crashes on me. Currently my most immediate issue is when I'm passing a large string to call_user_function, which itself is calling token_get_all. The file I'm parsing is pretty big, so the hash table returned is also pretty big (~500 records). But each time I loop through it, it segfaults half way through, even if I don't touch the records at all. I ran gdb on it and it tells me one of the internal hash pointers is invalid, which I'm not sure how this could have happened, since I'm only iterating through it. I've included a version of the function doing this below [2], and a sample of the gdb session I used as well [3]. If you'd like to see the original, plus the context of this operation, you can check it out here [1].
I have a hunch the problem lies in the way I'm allocating (or not allocating) the PHP variables involved. I did follow some of the guidelines in the book "Extending and Embedding PHP", but found that my code worked without all of the conventions, so instead I just omitted it when it didn't seem necessary.. And now I'm here :) If it is down to my bad memory handling habits, it would really be helpful if someone could point out, on what particular line, I'm doing things wrong. Then I could probably figure it out from there. Thanks, - Farley [1] http://github.com/farleyknight/ionize/blob/f1ee49f2c0f8a331bd77d59243bf8392615c7eca/etc/php_eval_string/php_eval_string.c [2] Code sample: VALUE zval2rb_hsh_(zval zhash) { VALUE rbhash = rb_hash_new(); char *string_key; ulong num_key; zval key, **value; VALUE rbkey, rbvalue; zend_hash_internal_pointer_reset(Z_ARRVAL(zhash)); printf("This hash table has %d entries\n", zend_hash_num_elements(Z_ARRVAL(zhash))); int current = 0; while (zend_hash_get_current_data(Z_ARRVAL(zhash), (void**)&value) == SUCCESS) { current++; printf("Currently on entry %d\n", current); if (zend_hash_move_forward(Z_ARRVAL(zhash)) == SUCCESS) printf("Done moving hash forward. Result was successful\n"); else printf("Done moving hash forward. Result was a failure\n"); } return rbhash; } [3] gdb session: gdb ruby GNU gdb 6.8-debian Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i486-linux-gnu"... (gdb) run test.rb Starting program: /usr/local/bin/ruby test.rb [Thread debugging using libthread_db enabled] Error while reading shared library symbols: Cannot find new threads: generic error Cannot find new threads: generic error (gdb) continue Continuing. calling phpversion 5.2.9 calling token get all, medium input This hash table has 429 entries Currently on entry 1 Done moving hash forward. Result was successful Currently on entry 2 .... .... Done moving hash forward. Result was successful Currently on entry 291 Done moving hash forward. Result was successful [New Thread 0xb7d846b0 (LWP 13069)] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb7d846b0 (LWP 13069)] zend_hash_get_current_data_ex (ht=0x817fc48, pData=0xbfa3acb8, pos=0x0) at /home/robinhoode/Desktop/php-5.2.9/Zend/zend_hash.c:1163 1163 *pData = p->pData; (gdb) quit The program is running. Exit anyway? (y or n) y -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
