我的php擴展中的分段錯誤

我寫了一個php擴展，但找不到它報告分段錯誤的原因。相關代碼：我的php擴展中的分段錯誤

   char *tkey = (char *)emalloc(sizeof(char)*(result_pair[num-1].length+1)); 
       std::memcpy(tkey, (text+i),result_pair[num-1].length); 
       tkey[result_pair[num-1].length]='\0'; 
       if (zend_hash_find(HASH_OF(return_value), tkey, result_pair[num-1].length+1, (void**)&origval) == SUCCESS) { 
        ZVAL_LONG(*origval, Z_LVAL_P(*origval)+1); 
        zend_hash_update(HASH_OF(return_value), tkey, result_pair[num-1].length+1, origval, sizeof(origval), NULL); 

       } else { 
        add_assoc_long(return_value, tkey, 1); 
       } 
       efree(tkey); 
       num--;

下面分別從GDB

Program received signal SIGSEGV, Segmentation fault. 
_zend_mm_alloc_int (heap=0x1ca07750, size=32) at /php-5.3.3/Zend/zend_alloc.c:1825 
1825       heap->cache[index] = best_fit->prev_free_block; 
Current language: auto; currently c 
(gdb) bt 
#0 _zend_mm_alloc_int (heap=0x1ca07750, size=32) at /php-5.3.3/Zend/zend_alloc.c:1825 
#1 0x0000000000729160 in add_assoc_long_ex (arg=0x1cc29380, key=0x20 <Address 0x20 out of bounds>, key_len=2, n=2) at /php-5.3.3/Zend/zend_API.c:1117 
#2 0x00002b2ebee6552e in zif_xs_search (ht=<value optimized out>, return_value=0x1cc29380, return_value_ptr=<value optimized out>, 
    this_ptr=<value optimized out>, return_value_used=<value optimized out>) at /release/xsplit_t/xsplit.cpp:1007 
#3 0x000000000076b489 in zend_do_fcall_common_helper_SPEC (execute_data=0x2b2ebf070050) at /php-5.3.3/Zend/zend_vm_execute.h:316 
#4 0x0000000000741cae in execute (op_array=0x1cc26378) at /php-5.3.3/Zend/zend_vm_execute.h:107 
#5 0x000000000071e5c9 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /php-5.3.3/Zend/zend.c:1194 
#6 0x00000000006cc8b8 in php_execute_script (primary_file=0x7fffb5324230) at /php-5.3.3/main/main.c:2260 
#7 0x00000000007a897e in main (argc=2, argv=0x7fffb53244a8) at /php-5.3.3/sapi/cli/php_cli.c:1192 
(gdb) frame 2 
#2 0x00002b2ebee6552e in zif_xs_search (ht=<value optimized out>, return_value=0x1cc29380, return_value_ptr=<value optimized out>, 
    this_ptr=<value optimized out>, return_value_used=<value optimized out>) at /release/xsplit_t/xsplit.cpp:1007 
1007        add_assoc_long(return_value, tkey, 1); 
Current language: auto; currently c++

我想通了，這個問題是add_assoc_long功能， 'TKEY' 被聲明爲：

char *tkey = (char *)emalloc(sizeof(char)*(result_pair[num-1].length+1));

段錯誤只發生在某些情況下但並非總是如此，但我認爲tkey不會有任何問題。任何幫助表示讚賞，非常感謝〜

來源

2010-10-23 Mickey Shine

你的memcpy不復制空字符，你需要的字節數的+1要複製：

std::memcpy(tkey, (text+i),result_pair[num-1].length+1); 
                ^^

來源

2010-10-23 05:24:35 codaddict

似乎不是這個原因。 zend_hash_update（HASH_OF（return_value），tkey，result_pair [num-1] .length + 1，origval，sizeof（origval），NULL）; 貌似會修改tkey – 2010-10-23 08:40:07

我的php擴展中的分段錯誤

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