1661a472b8
boost::interprocess::file_lock cannot open the files that contain characters which cannot be parsed by the user's code page on Windows. This commit add a new class to handle those specific file for Windows.
101 lines
2.1 KiB
C++
101 lines
2.1 KiB
C++
#include <fs.h>
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#ifndef WIN32
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#include <fcntl.h>
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#else
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#include <codecvt>
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#include <windows.h>
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#endif
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namespace fsbridge {
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FILE *fopen(const fs::path& p, const char *mode)
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{
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return ::fopen(p.string().c_str(), mode);
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}
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FILE *freopen(const fs::path& p, const char *mode, FILE *stream)
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{
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return ::freopen(p.string().c_str(), mode, stream);
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}
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#ifndef WIN32
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static std::string GetErrorReason() {
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return std::strerror(errno);
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}
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FileLock::FileLock(const fs::path& file)
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{
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fd = open(file.string().c_str(), O_RDWR);
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if (fd == -1) {
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reason = GetErrorReason();
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}
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}
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FileLock::~FileLock()
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{
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if (fd != -1) {
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close(fd);
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}
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}
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bool FileLock::TryLock()
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{
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if (fd == -1) {
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return false;
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}
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struct flock lock;
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lock.l_type = F_WRLCK;
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lock.l_whence = SEEK_SET;
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lock.l_start = 0;
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lock.l_len = 0;
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if (fcntl(fd, F_SETLK, &lock) == -1) {
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reason = GetErrorReason();
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return false;
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}
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return true;
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}
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#else
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static std::string GetErrorReason() {
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wchar_t* err;
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FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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nullptr, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), reinterpret_cast<WCHAR*>(&err), 0, nullptr);
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std::wstring err_str(err);
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LocalFree(err);
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return std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>().to_bytes(err_str);
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}
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FileLock::FileLock(const fs::path& file)
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{
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hFile = CreateFileW(file.wstring().c_str(), GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
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nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
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if (hFile == INVALID_HANDLE_VALUE) {
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reason = GetErrorReason();
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}
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}
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FileLock::~FileLock()
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{
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if (hFile != INVALID_HANDLE_VALUE) {
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CloseHandle(hFile);
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}
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}
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bool FileLock::TryLock()
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{
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if (hFile == INVALID_HANDLE_VALUE) {
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return false;
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}
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_OVERLAPPED overlapped = {0};
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if (!LockFileEx(hFile, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, 0, 0, &overlapped)) {
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reason = GetErrorReason();
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return false;
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}
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return true;
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}
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#endif
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} // fsbridge
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