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Merge #13149: Handle unsuccessful fseek(...):s

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20ce5af Print a log message if we fail to shrink the debug log file (practicalswift)
29c9bdc Handle unsuccessful fseek(...):s (practicalswift)

Pull request description:

  Handle unsuccessful `fseek(...)`:s.

  **Note to reviewers:** What is the most appropriate course of actions for each of these unsuccessful `fseek(...)`:s?

Tree-SHA512: 5b3d82dbdd15d434d3f08dcb4df62888da4df8541d2586f56a4e529083005f6782c39e10645acd1ec403da83061bbfd8dbf2dddc66e09268d410ad0918c61876
This commit is contained in:
Wladimir J. van der Laan 2018-05-07 13:39:13 +02:00 committed by UdjinM6
parent 732697586f
commit 913079b535
No known key found for this signature in database
GPG Key ID: 83592BD1400D58D9
3 changed files with 11 additions and 3 deletions
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4
src/index/txindex.cpp
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@ -268,7 +268,9 @@ bool TxIndex::FindTx(const uint256& tx_hash, uint256& block_hash, CTransactionRe
CBlockHeader header; CBlockHeader header;
try { try {
file >> header; file >> header;
fseek(file.Get(), postx.nTxOffset, SEEK_CUR); if (fseek(file.Get(), postx.nTxOffset, SEEK_CUR)) {
return error("%s: fseek(...) failed", __func__);
}
file >> tx; file >> tx;
} catch (const std::exception& e) { } catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what()); return error("%s: Deserialize or I/O error - %s", __func__, e.what());

6
src/logging.cpp
View File

@ -308,7 +308,11 @@ void BCLog::Logger::ShrinkDebugFile()
{ {
// Restart the file with some of the end // Restart the file with some of the end
std::vector<char> vch(RECENT_DEBUG_HISTORY_SIZE, 0); std::vector<char> vch(RECENT_DEBUG_HISTORY_SIZE, 0);
fseek(file, -((long)vch.size()), SEEK_END); if (fseek(file, -((long)vch.size()), SEEK_END)) {
LogPrintf("Failed to shrink debug log file: fseek(...) failed\n");
fclose(file);
return;
}
int nBytes = fread(vch.data(), 1, vch.size(), file); int nBytes = fread(vch.data(), 1, vch.size(), file);
fclose(file); fclose(file);

4
src/util.cpp
View File

@ -1024,7 +1024,9 @@ void AllocateFileRange(FILE *file, unsigned int offset, unsigned int length) {
// Fallback version // Fallback version
// TODO: just write one byte per block // TODO: just write one byte per block
static const char buf[65536] = {}; static const char buf[65536] = {};
fseek(file, offset, SEEK_SET); if (fseek(file, offset, SEEK_SET)) {
return;
}
while (length > 0) { while (length > 0) {
unsigned int now = 65536; unsigned int now = 65536;
if (length < now) if (length < now)