[Rpm-maint] how to free memory after querying installed pkgs....

Pazzo Da Legare pazzodalegare at gmail.com
Wed Dec 19 12:04:44 UTC 2007

Dear all,

I want to make simple query on pkgs in rpmdb. I wrote this simple
function...but I don't understand how to free resources. I tried this
function on every package querying for pkg description and pkg
summary...but I have a memory leakage. Could you help me? If I use the
headerFree() function after rpmdbFreeIterator() I got a segmentation



char *queryPackage(char *pkgName, const char *query,  char **perrMsg){
        Header h;
        rpmts ts;
        int rc;
        char *sResult=NULL, *errMsg=NULL;

        //necessario per impostare il dbpath
        rpmReadConfigFiles( NULL, NULL );
        ts = rpmtsCreate();
        rc = rpmtsOpenDB(ts, O_RDONLY);

        if( rc != 0 ) {
                fprintf( stderr, "cannot open RPM database.\n" );
                *perrMsg = (char *)rpmErrorString();
                return ( NULL );

        rpmdbMatchIterator mi = rpmtsInitIterator(ts, RPMTAG_NAME, pkgName, 0);

        while( (h=rpmdbNextIterator(mi) )!=NULL ) {
                sResult = headerSprintf(h, query, rpmTagTable, rpmHeaderFormats,
(errmsg_t *)&errMsg);
                                break; //only one pkg with pkgName
        //headerFree(h)       //<- this give me a segmentation fault
        ts = rpmtsFree(ts);
        *perrMsg = errMsg;
        return sResult;

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