public static unsafe void WriteFileHeader(FileHeader *header, VoronPathSetting path)
{
bool syncIsNeeded = false;
var fd = Syscall.open(path.FullPath, OpenFlags.O_WRONLY | PerPlatformValues.OpenFlags.O_CREAT,
FilePermissions.S_IWUSR | FilePermissions.S_IRUSR);
try
{
if (fd == -1)
{
var err = Marshal.GetLastWin32Error();
Syscall.ThrowLastError(err, "when opening " + path);
}
int remaining = sizeof(FileHeader);
FileInfo fi = new FileInfo(path.FullPath);
if (fi.Length != remaining)
{
syncIsNeeded = true;
}
var ptr = ((byte *)header);
while (remaining > 0)
{
var written = Syscall.write(fd, ptr, (ulong)remaining);
if (written == -1)
{
var err = Marshal.GetLastWin32Error();
Syscall.ThrowLastError(err, "writing to " + path);
}
remaining -= (int)written;
ptr += written;
}
if (Syscall.FSync(fd) == -1)
{
var err = Marshal.GetLastWin32Error();
Syscall.ThrowLastError(err, "FSync " + path);
}
if (syncIsNeeded)
{
Syscall.FsyncDirectoryFor(path.FullPath);
}
}
finally
{
if (fd != -1)
{
Syscall.close(fd);
fd = -1;
}
}
}