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feat: support log file truncation on windows (#960)

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Huy Q. Bui 2023-10-08 19:03:10 +07:00 committed by GitHub
parent 615966eb6d
commit 4dbc26af72
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 17 additions and 1 deletions
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1
CMakeLists.txt
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@ -131,6 +131,7 @@ check_function_exists (sigaltstack HAVE_SIGALTSTACK)
check_cxx_symbol_exists (backtrace execinfo.h HAVE_EXECINFO_BACKTRACE)
check_cxx_symbol_exists (backtrace_symbols execinfo.h
HAVE_EXECINFO_BACKTRACE_SYMBOLS)
check_cxx_symbol_exists (_chsize_s io.h HAVE__CHSIZE_S)
# NOTE gcc does not fail if you pass a non-existent -Wno-* option as an
# argument. However, it will happily fail if you pass the corresponding -W*

1
bazel/glog.bzl
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@ -114,6 +114,7 @@ def glog_library(namespace = "google", with_gflags = 1, **kwargs):
"-DGLOG_EXPORT=__declspec(dllexport)",
"-DGLOG_NO_ABBREVIATED_SEVERITIES",
"-DHAVE_SNPRINTF",
"-DHAVE__CHSIZE_S",
"-I" + src_windows,
]

3
src/config.h.cmake.in
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@ -130,6 +130,9 @@
/* define if gmtime_r is available in time.h */
#cmakedefine HAVE_GMTIME_R
/* define if _chsize_s is available in io.h */
#cmakedefine HAVE__CHSIZE_S
/* Define to the sub-directory in which libtool stores uninstalled libraries.
*/
#cmakedefine LT_OBJDIR

13
src/logging.cc
View File

@ -58,6 +58,9 @@
#ifdef HAVE_SYSLOG_H
# include <syslog.h>
#endif
#ifdef HAVE__CHSIZE_S
#include <io.h> // for truncate log file
#endif
#include <vector>
#include <cerrno> // for errno
#include <sstream>
@ -2425,7 +2428,7 @@ void GetExistingTempDirectories(vector<string>* list) {
}
void TruncateLogFile(const char *path, uint64 limit, uint64 keep) {
#ifdef HAVE_UNISTD_H
#if defined(HAVE_UNISTD_H) || defined(HAVE__CHSIZE_S)
struct stat statbuf;
const int kCopyBlockSize = 8 << 10;
char copybuf[kCopyBlockSize];
@ -2446,7 +2449,11 @@ void TruncateLogFile(const char *path, uint64 limit, uint64 keep) {
// all of base/...) with -D_FILE_OFFSET_BITS=64 but that's
// rather scary.
// Instead just truncate the file to something we can manage
#ifdef HAVE__CHSIZE_S
if (_chsize_s(fd, 0) != 0) {
#else
if (truncate(path, 0) == -1) {
#endif
PLOG(ERROR) << "Unable to truncate " << path;
} else {
LOG(ERROR) << "Truncated " << path << " due to EFBIG error";
@ -2491,7 +2498,11 @@ void TruncateLogFile(const char *path, uint64 limit, uint64 keep) {
// Truncate the remainder of the file. If someone else writes to the
// end of the file after our last read() above, we lose their latest
// data. Too bad ...
#ifdef HAVE__CHSIZE_S
if (_chsize_s(fd, write_offset) != 0) {
#else
if (ftruncate(fd, write_offset) == -1) {
#endif
PLOG(ERROR) << "Unable to truncate " << path;
}