>
>
>So I poked around and found that curl_easy_cleanup() doesn't cleanup the ssl
>> error strings. Amending my code by adding
>>
>> curl_global_cleanup();
>>
>> before the line 'return 0;' seemed to solve all the memory leaks.
>
>
>
>The suggested use of curl_global_cleanup() is in fact documented and this is
>not a surprise to me. It is designed to work like this.
>
>
>
>>> This didn't seem to match my expectations, these memory leaks wouldn't cause
>>> my program to grow to the sizes i was seeing.
>>
>>
>
>Right, since those error strings should be loaded only once by this.
>
>
Okay seems reasonable, but this is not the main issue.

>>> Detected memory leaks!
>>> Dumping objects ->
>>> {3373} normal block at 0x009FC760, 12 bytes long.
>>> Data: < > B0 C6 9F 00 00 00 00 00 06 00 00 00
>>> ...
>>> {2986} normal block at 0x009F6BA0, 96 bytes long.
>>> Data: <0l C C > 30 6C 9F 00 C7 05 43 00 BD 05 43 00 08 00 00 00
>>> Object dump complete.
>>>
>>> I may require some further analysis to locate these.
>>
>>
>
>How many bytes leak in total? How many blocks leaked?
>
>Does the leak amount differ if you change the postfields string length?
>
>What tool are you using to detect these leaks? Can it be used to somehow track
>where the allocations are made?
>

These memory leaks are detected as a part of the debug memory functions
included with Microsoft Visual C++. I modified openssl to use these
memory debug functions and got this output:

Detected memory leaks!
Dumping objects ->
.\crypto\lhash\lhash.c(193) : {3390} normal block at 0x009EC760, 12
bytes long.
 Data: < > B0 C6 9E 00 00 00 00 00 06 00 00 00
.\crypto\stack\stack.c(126) : {3389} normal block at 0x009EC720, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3388} normal block at 0x009EC6E0, 20
bytes long.
 Data: < > 00 00 00 00 20 C7 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3387} normal block at 0x009EC6B0, 12 bytes long.
 Data: < > 06 00 00 00 E0 C6 9E 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3154} normal block at 0x009E8990, 12
bytes long.
 Data: < > E0 88 9E 00 00 00 00 00 0A 00 00 00
.\crypto\stack\stack.c(126) : {3153} normal block at 0x009E8950, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3152} normal block at 0x009E8910, 20
bytes long.
 Data: < P > 00 00 00 00 50 89 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3151} normal block at 0x009E88E0, 12 bytes long.
 Data: < > 0A 00 00 00 10 89 9E 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3127} normal block at 0x009E82C0, 12
bytes long.
 Data: < > 10 82 9E 00 00 00 00 00 03 00 00 00
.\crypto\stack\stack.c(126) : {3126} normal block at 0x009E8280, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3125} normal block at 0x009E8240, 20
bytes long.
 Data: < > 00 00 00 00 80 82 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3124} normal block at 0x009E8210, 12 bytes long.
 Data: < @ > 03 00 00 00 40 82 9E 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3052} normal block at 0x009E7C20, 12
bytes long.
 Data: <p{ > 70 7B 9E 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(126) : {3051} normal block at 0x009E7BE0, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3050} normal block at 0x009E7BA0, 20
bytes long.
 Data: < { > 00 00 00 00 E0 7B 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3049} normal block at 0x009E7B70, 12 bytes long.
 Data: < { > 00 00 00 00 A0 7B 9E 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3047} normal block at 0x009E7AD0, 12
bytes long.
 Data: < z > 20 7A 9E 00 00 00 00 00 01 00 00 00
.\crypto\stack\stack.c(126) : {3046} normal block at 0x009E7A90, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3045} normal block at 0x009E7A50, 20
bytes long.
 Data: < z > 00 00 00 00 90 7A 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3044} normal block at 0x009E7A20, 12 bytes long.
 Data: < Pz > 01 00 00 00 50 7A 9E 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3040} normal block at 0x009E7850, 12
bytes long.
 Data: < w > A0 77 9E 00 90 89 9E 00 02 00 00 00
.\crypto\stack\stack.c(126) : {3039} normal block at 0x009E7810, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3038} normal block at 0x009E77D0, 20
bytes long.
 Data: < x > 00 00 00 00 10 78 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3037} normal block at 0x009E77A0, 12 bytes long.
 Data: < w > 02 00 00 00 D0 77 9E 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3022} normal block at 0x009E7250, 12
bytes long.
 Data: < q > A0 71 9E 00 00 00 00 00 04 00 00 00
.\crypto\stack\stack.c(126) : {3021} normal block at 0x009E7210, 16
bytes long.
 Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3020} normal block at 0x009E71D0, 20
bytes long.
 Data: < r > 00 00 00 00 10 72 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3019} normal block at 0x009E71A0, 12 bytes long.
 Data: < q > 04 00 00 00 D0 71 9E 00 00 00 00 00
.\crypto\ex_data.c(339) : {3009} normal block at 0x009E6BA0, 20 bytes long.
 Data: < D L > 00 00 00 00 44 16 4C 00 00 00 00 00 00 00 00 00
.\crypto\lhash\lhash.c(193) : {3008} normal block at 0x009E6A10, 12
bytes long.
 Data: < h > B0 68 9E 00 00 00 00 00 05 00 00 00
.\crypto\stack\stack.c(126) : {3007} normal block at 0x009E6920, 16
bytes long.
 Data: < k > A0 6B 9E 00 00 00 00 00 00 00 00 00 00 00 00 00
.\crypto\stack\stack.c(124) : {3006} normal block at 0x009E68E0, 20
bytes long.
 Data: < i > 01 00 00 00 20 69 9E 00 00 00 00 00 04 00 00 00
.\crypto\ex_data.c(308) : {3005} normal block at 0x009E68B0, 12 bytes long.
 Data: < h > 05 00 00 00 E0 68 9E 00 01 00 00 00
.\crypto\lhash\lhash.c(121) : {3004} normal block at 0x009E6840, 64
bytes long.
 Data: < | z Px > 20 7C 9E 00 D0 7A 9E 00 50 78 9E 00 C0 82 9E 00
.\crypto\lhash\lhash.c(119) : {3003} normal block at 0x009E6F90, 96
bytes long.
 Data: <@h C C > 40 68 9E 00 97 B1 43 00 8D B1 43 00 08 00 00 00
Object dump complete.

Not entirely useful, but better than before.

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Received on 2003-08-22