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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /build/clang-plugin/mozsearch-plugin/FileOperations.h | |
parent | Initial commit. (diff) | |
download | thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | build/clang-plugin/mozsearch-plugin/FileOperations.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/build/clang-plugin/mozsearch-plugin/FileOperations.h b/build/clang-plugin/mozsearch-plugin/FileOperations.h new file mode 100644 index 0000000000..90764484da --- /dev/null +++ b/build/clang-plugin/mozsearch-plugin/FileOperations.h @@ -0,0 +1,70 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef FileOperations_h +#define FileOperations_h + +#include <stdio.h> +#include <string> + +#if defined(_WIN32) || defined(_WIN64) +#include <windows.h> +#define PATHSEP_CHAR '\\' +#define PATHSEP_STRING "\\" +#else +#define PATHSEP_CHAR '/' +#define PATHSEP_STRING "/" +#endif + +// Make sure that all directories on path exist, excluding the final element of +// the path. +void ensurePath(std::string Path); + +std::string getAbsolutePath(const std::string &Filename); + +// Used to synchronize access when writing to an analysis file, so that +// concurrently running clang instances don't clobber each other's data. +// On Windows, we use a named mutex. On POSIX platforms, we use flock on the +// source files. flock is advisory locking, and doesn't interfere with clang's +// own opening of the source files (i.e. to interfere, clang would have to be +// using flock itself, which it does not). +struct AutoLockFile { + // Absolute path to the analysis file + std::string Filename; + +#if defined(_WIN32) || defined(_WIN64) + // Handle for the named Mutex + HANDLE Handle = NULL; +#else + // fd for the *source* file that corresponds to the analysis file. We use + // the source file because it doesn't change while the analysis file gets + // repeatedly replaced by a new version written to a separate tmp file. + // This fd is used when using flock to synchronize access. + int FileDescriptor = -1; +#endif + + // SrcFile should be the absolute path to the source code file, and DstFile + // the absolute path to the corresponding analysis file. This constructor + // will block until exclusive access has been obtained. + AutoLockFile(const std::string &SrcFile, const std::string &DstFile); + ~AutoLockFile(); + + // Check after constructing to ensure the mutex was properly set up. + bool success(); + + // There used to be an `openFile` method here but we switched to directly + // using a std::ifstream for the input file in able to take advantage of its + // support for variable length lines (as opposed to fgets which takes a fixed + // size buffer). + + // Open a new tmp file for writing the new analysis data to. Caller is + // responsible for fclose'ing it. + FILE *openTmp(); + // Replace the existing analysis file with the new "tmp" one that has the new + // data. Returns false on error. + bool moveTmp(); +}; + +#endif |