hi,
like promised, here's the gdb backtrace for the php4 udm_*() functions
segfault. the segfault occurs in udm_get_res_field().
first of all the minimum .php implementation for a quick search:
<?
// lets search for the word "mp3"
$q = "mp3";
if ($udmconn = udm_alloc_agent("mysql://root@localhost/w3audio/","crc-multi")) {
udm_set_agent_param($udmconn, UDM_PARAM_PAGE_SIZE, 10);
$result = udm_find($udmconn,$q);
echo udm_get_res_param($result,UDM_PARAM_SEARCHTIME)." sek searchtime\n";
echo udm_get_res_param($result,UDM_PARAM_FOUND)." results.\n\n";
// give me 4 results
$bgn = 0; $end = 3;
while ($bgn <= $end) {
echo $bgn." - ";
echo udm_get_res_field($result,$bgn,UDM_FIELD_TITLE)."\n";
echo " ".udm_get_res_field($result,$bgn,UDM_FIELD_URL)."\n\n";
}
udm_free_res($result);
udm_free_agent($udmconn);
}
?>
then run it on the commandline:
# ./php test.php
0.01 sek searchtime
1407 results.
Segmentation fault
*boof*
now lets go to gdb:
# gdb ./php
(gdb) run -q test.php
Starting program: ./php -q test.php
0.01 sek searchtime
1407 results.
Program received signal SIGSEGV, Segmentation fault.
0x8066c57 in php_if_udm_get_res_field (ht=3, return_value=0x818ac7c, this_ptr=0x0,
return_value_used=1) at php_mnogo.c:845
845 RETURN_STRING((Res->Doc[row].text),1);
(gdb) backtrace
#0 0x8066c57 in php_if_udm_get_res_field (ht=3, return_value=0x818ac7c, this_ptr=0x0,
return_value_used=1) at php_mnogo.c:845
#1 0x80e5e5b in execute (op_array=0x818d2bc) at ./zend_execute.c:1489
#2 0x80c354b in zend_execute_scripts (type=8, file_count=3) at zend.c:743
#3 0x806021b in php_execute_script (primary_file=0xbffff9b8) at main.c:1196
#4 0x805e75c in main (argc=3, argv=0xbffffa34) at cgi_main.c:733
(gdb) where
#0 0x8066c57 in php_if_udm_get_res_field (ht=3, return_value=0x818ac7c, this_ptr=0x0,
return_value_used=1) at php_mnogo.c:845
#1 0x80e5e5b in execute (op_array=0x818d2bc) at ./zend_execute.c:1489
#2 0x80c354b in zend_execute_scripts (type=8, file_count=3) at zend.c:743
#3 0x806021b in php_execute_script (primary_file=0xbffff9b8) at main.c:1196
#4 0x805e75c in main (argc=3, argv=0xbffffa34) at cgi_main.c:733
(gdb) frame 0
#0 0x8066c57 in php_if_udm_get_res_field (ht=3, return_value=0x818ac7c, this_ptr=0x0,
return_value_used=1) at php_mnogo.c:845
845 RETURN_STRING((Res->Doc[row].text),1);
(gdb) print ht
$1 = 3
(gdb) print return_value
$2 = (zval *) 0x818ac7c
(gdb) print this_ptr
$3 = (zval *) 0x0
(gdb) print return_value_used
$4 = 1
(gdb) print Res
$5 = (UDM_RESULT *) 0x0
(gdb) print Res->Doc
Cannot access memory at address 0x414.
(gdb) print Res->Doc[row]
No symbol "row" in current context.
(gdb) print Res->Doc[row].text
No symbol "row" in current context.
(gdb)
Hopefully this is a small bug and can be fixed soon. Hopefully i could
help to find it....
Please, if you know what is causing the segmentation fault, let me
know.
Thank you
Andy
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