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POmemory leak in *ProC file
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copied!<p>I have some memory leak in my file and valgrind points to the code given below in the .cc file</p> <pre><code>sqlcxt(&ctx, &sqlctx, &sqlstm, &sqlfpn); </code></pre> <p>The code doesnot have this directly.The code is</p> <pre><code> SQLDA *bind_dp; SQLDA *select_dp; /* Allocate memory for the select and bind descriptors. */ if (!Db::alloc_descriptors(MAX_ITEMS, MAX_VNAME_LEN, MAX_INAME_LEN, bind_dp, select_dp)) goto errexit; EXEC SQL WHENEVER SQLERROR GOTO errexit_select; EXEC SQL PREPARE S FROM :query; EXEC SQL DECLARE C CURSOR FOR S; Db::set_bind_variables(bind_dp, &paramList); EXEC SQL OPEN C USING DESCRIPTOR bind_dp; Db::process_select_list(select_dp, dbQueryRsp); /* When done, free the memory allocated for pointers in the bind and select descriptors. */ for (int i = 0; i < MAX_ITEMS; i++) { if (bind_dp->V[i] != (char *) 0) free(bind_dp->V[i]); free(bind_dp->I[i]); /* MAX_ITEMS were allocated. */ if (select_dp->V[i] != (char *) 0) free(select_dp->V[i]); free(select_dp->I[i]); /* MAX_ITEMS were allocated. */ } /* Free space used by the descriptors themselves. */ SQLSQLDAFree( ctx, bind_dp); SQLSQLDAFree( ctx, select_dp); EXEC SQL WHENEVER SQLERROR CONTINUE; /* Close the cursor. */ EXEC SQL CLOSE C; </code></pre> <p>The alloc_descriptors is as follows:</p> <pre><code>bool Db::alloc_descriptors(int size, int max_vname_len, int max_iname_len, SQLDA *&bind_dp, SQLDA *&select_dp) { GET_CONTEXT_DEFINE_SQLCA; EXEC SQL CONTEXT USE :ctx; if ((bind_dp = SQLSQLDAAlloc(ctx, size, max_vname_len, max_iname_len)) == (SQLDA *) 0) { logMsg(DEBUG, 2,"Cannot allocate memory for bind descriptor."); return false; /* Have to exit in this case. */ } if ((select_dp = SQLSQLDAAlloc (ctx, size, max_vname_len, max_iname_len)) == (SQLDA *) 0) { logMsg(DEBUG, 2,"Cannot allocate memory for select descriptor."); return false; } select_dp->N = MAX_ITEMS; /* Allocate the pointers to the indicator variables, and the actual data. */ for (int i = 0; i < MAX_ITEMS; i++) { bind_dp->I[i] = (short *) malloc(sizeof (short)); select_dp->I[i] = (short *) malloc(sizeof(short)); bind_dp->V[i] = (char *) malloc(1); select_dp->V[i] = (char *) malloc(1); } return true; } </code></pre> <p>The total code i can give in the .cc file is</p> <pre><code> /* EXEC SQL OPEN C USING DESCRIPTOR bind_dp; */ { struct sqlexd sqlstm; sqlstm.sqlvsn = 12; sqlstm.arrsiz = 1; sqlstm.sqladtp = &sqladt; sqlstm.sqltdsp = &sqltds; sqlstm.stmt = ""; sqlstm.iters = (unsigned int )1; sqlstm.offset = (unsigned int )24; sqlstm.selerr = (unsigned short)100; sqlstm.cud = sqlcud0; sqlstm.sqlest = (unsigned char *)&sqlca; sqlstm.sqlety = (unsigned short)4352; sqlstm.occurs = (unsigned int )0; sqlstm.sqcmod = (unsigned int )0; sqlstm.sqhstv[0] = (unsigned char *)bind_dp; sqlstm.sqhstl[0] = (unsigned long )0; sqlstm.sqhsts[0] = ( int )0; sqlstm.sqindv[0] = ( short *)0; sqlstm.sqinds[0] = ( int )0; sqlstm.sqharm[0] = (unsigned long )0; sqlstm.sqadto[0] = (unsigned short )0; sqlstm.sqtdso[0] = (unsigned short )0; sqlstm.sqphsv = sqlstm.sqhstv; sqlstm.sqphsl = sqlstm.sqhstl; sqlstm.sqphss = sqlstm.sqhsts; sqlstm.sqpind = sqlstm.sqindv; sqlstm.sqpins = sqlstm.sqinds; sqlstm.sqparm = sqlstm.sqharm; sqlstm.sqparc = sqlstm.sqharc; sqlstm.sqpadto = sqlstm.sqadto; sqlstm.sqptdso = sqlstm.sqtdso; sqlcxt(&ctx, &sqlctx, &sqlstm, &sqlfpn); } DbT::process_select_list(select_dp, dbQueryRsp); </code></pre> <p>can some one explain what does this mean.</p> <p>The dump of valgrind is this:</p> <pre><code>==1212== 124 bytes in 1 blocks are possibly lost in loss record 2,103 of 3,407 ==1212== at 0x4A078B8: malloc (vg_replace_malloc.c:270) ==1212== by 0x643CC59: sqlalc (in /home/product/11.2.0/client_1/lib/libclntsh.so.11.1) ==1212== by 0x7D32749: sqlbrl (in /home/product/11.2.0/client_1/lib/libclntsh.so.11.1) ==1212== by 0x6D96B7A: sqlbds (in /home/product/11.2.0/client_1/lib/libclntsh.so.11.1) ==1212== by 0x7D34543: sqlnst (in /home/product/11.2.0/client_1/lib/libclntsh.so.11.1) ==1212== by 0x7D3068A: sqlcxt (in /home/product/11.2.0/client_1/lib/libclntsh.so.11.1) ==1212== by 0x9440C25: execute(std::string const&, cil_cch_namespace::ParamTypeListList const&, cil_cch_namespace::QueryType&, long&, long&, ExtError&) (Db.cc:608) ==1212== by 0x94430B0: execute(std::string const&, std::string&, long&, ExtError&) (Db.cc:474) </code></pre>

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