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Merge pull request #1795 from graydon/truncate-but-still-append

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Open files with "ab" mode even if truncating.
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Gabi Melman 2021-01-09 12:20:26 +02:00 committed by GitHub
commit 710a0e3a45
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1 changed files with 16 additions and 1 deletions
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17
include/spdlog/details/file_helper-inl.h
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@ -29,12 +29,27 @@ SPDLOG_INLINE void file_helper::open(const filename_t &fname, bool truncate)
{
close();
filename_ = fname;
auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
auto *mode = SPDLOG_FILENAME_T("ab");
auto *trunc_mode = SPDLOG_FILENAME_T("wb");
for (int tries = 0; tries < open_tries_; ++tries)
{
// create containing folder if not exists already.
os::create_dir(os::dir_name(fname));
if (truncate)
{
// Truncate by opening-and-closing a tmp file in "wb" mode, always
// opening the actual log-we-write-to in "ab" mode, since that
// interacts more politely with eternal processes that might
// rotate/truncate the file underneath us.
std::FILE *tmp;
if (os::fopen_s(&tmp, fname, trunc_mode))
{
continue;
}
std::fclose(tmp);
}
if (!os::fopen_s(&fd_, fname, mode))
{
return;