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Memory problems with libwww

From: Manish Ballav <mballav@hotmail.com>
Date: Sun, 08 Jul 2001 17:11:48 -0700
To: www-lib@w3.org
Message-ID: <F264zcbLDiKBsuZ2K4x000043d5@hotmail.com>

Hi,

I have successfully compiled and installed the libwww on solaris 7. I have 
even run "chunk.c" without any problems, but when I wrote my own application 
in C++ which has a download routine containing the exact same lines from 
chunk.c, it core dumps. I am including the code and a trace from the 
debugger. Seems like a memory problem, but I have no clue why...

Please help.

Thanks,
Manish

PS: Please send a copy to this my hotmail address as well as I am not a 
subscriber yet....

------------------------ backtrace from gdb ------------------------
#0  0xfeec5558 in _smalloc () from /usr/lib/libc.so.1
#1  0xfeec559c in malloc () from /usr/lib/libc.so.1
#2  0xfeeb9c20 in calloc () from /usr/lib/libc.so.1
#3  0xff0a4570 in HTMemory_calloc (nobj=1, size=24) at HTMemory.c:88
#4  0xff143fec in HTStreamToChunk (request=0x2a7b0, chunk=0xffbef93c,
    max_size=0) at HTSChunk.c:121
#5  0xff2d75bc in HTLoadToChunk (
    url=0x30748 "http://www.eecs.umich.edu/~aprakash/585/index.html",
    request=0x2a7b0) at HTAccess.c:188
#6  0x137dc in HttpDownloader::download (this=0x2a3b0,
    remotefilename=0x18428 "/~aprakash/585/index.html",
    localfile=0x18448 "index.html") at http.cpp:58

------------------------ C++ Code ----------------------------------
#include "WWWLib.h"
#include "WWWHTTP.h"
#include "WWWInit.h"

#include "downloader.h"
#include "http.h"
#include "global.h"

HttpDownloader::HttpDownloader(char *hostname) {
  this->host = hostname;
}

int HttpDownloader::download(char *remotefilename, char *localfile) {

    HTRequest * request = HTRequest_new();
    HTChunk * chunk = NULL;

    /* Initialize libwww core */
    HTProfile_newPreemptiveClient("TestApp", "1.0");

    /* Gotta set up our own traces */
    HTPrint_setCallback(printer);
    HTTrace_setCallback(tracer);

    /* Turn on TRACE so we can see what is going on */
#if 1
    HTSetTraceMessageMask("sop");
#endif

    char * url1;
    url1 = new char[sizeof(this->host) + sizeof(remotefilename) + 10];
    strcpy(url1, "http://");
    strcat(url1, this->host);
    strcat(url1, remotefilename);

    char *url = strdup(url1);

    printf("URL = %s\n", url);

    /* We want raw output including headers */
    HTRequest_setOutputFormat(request, WWW_RAW);

    /* Close connection immediately */
    HTRequest_addConnection(request, "close", "");

    /* Add our own filter to handle termination */
//    HTNet_addAfter(terminate_handler, NULL, NULL, HT_ALL, HT_FILTER_LAST);

    if (url) {
        char * cwd = HTGetCurrentDirectoryURL();
//      char * absolute_url = HTParse(url, cwd, PARSE_ALL);
        printf("check 4 cwd = %s, url = %s\n", cwd, url);
        if (!request)
           printf("Ha Ha\n");
        chunk = HTLoadToChunk(url, request);
        printf("check 4\n");
//      HT_FREE(absolute_url);
        HT_FREE(cwd);

        /* If chunk != NULL then we have the data */
        if (chunk) {
            char * string;
            /* Go into the event loop... */
            HTEventList_loop(request);
            /* print the chunk result */
            string = HTChunk_toCString(chunk);
            HTPrint("%s", string ? string : "no text");
            HT_FREE(string);
        }
    } else {
        HTPrint("Type the URL you want to accces on the command line\n");
    }

    /* Clean up the request */
    HTRequest_delete(request);

    /* Terminate the Library */
    HTProfile_delete();
    return 0;
}


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Received on Sunday, 8 July 2001 20:12:19 GMT

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