public static unsafe void WriteFileHeader(FileHeader *header, string path)
{
var fd = Syscall.open(path, OpenFlags.O_WRONLY | OpenFlags.O_CREAT,
FilePermissions.ALLPERMS);
try
{
if (fd == -1)
{
ThrowLastError(Marshal.GetLastWin32Error());
}
int remaining = sizeof(FileHeader);
var ptr = ((byte *)header);
while (remaining > 0)
{
var written = Syscall.write(fd, ptr, (ulong)remaining);
if (written == -1)
{
ThrowLastError(Marshal.GetLastWin32Error());
}
remaining -= (int)written;
ptr += written;
}
Syscall.fsync(fd);
}
finally
{
if (fd != -1)
{
Syscall.close(fd);
}
}
}
public static unsafe void WriteFileHeader(FileHeader *header, string path)
{
var fd = Syscall.open(path, OpenFlags.O_WRONLY | OpenFlags.O_CREAT,
FilePermissions.S_IWUSR | FilePermissions.S_IRUSR);
try
{
if (fd == -1)
{
var err = Marshal.GetLastWin32Error();
ThrowLastError(err, "when opening " + path);
}
int remaining = sizeof(FileHeader);
var ptr = ((byte *)header);
while (remaining > 0)
{
var written = Syscall.write(fd, ptr, (ulong)remaining);
if (written == -1)
{
var err = Marshal.GetLastWin32Error();
ThrowLastError(err, "writing to " + path);
}
remaining -= (int)written;
ptr += written;
}
if (Syscall.fsync(fd) == -1)
{
var err = Marshal.GetLastWin32Error();
ThrowLastError(err, "fsync " + path);
}
if (CheckSyncDirectoryAllowed(path) && SyncDirectory(path) == -1)
{
var err = Marshal.GetLastWin32Error();
ThrowLastError(err, "fsync dir " + path);
}
}
finally
{
if (fd != -1)
{
Syscall.close(fd);
fd = -1;
}
}
}
public static int SyncDirectory(string path)
{
var dir = Path.GetDirectoryName(path);
var fd = Syscall.open(dir, 0, 0);
if (fd == -1)
{
return(-1);
}
var fsyncRc = Syscall.fsync(fd);
if (fsyncRc == -1)
{
return(-1);
}
return(Syscall.close(fd));
}
public void Truncate(long size)
{
var result = Syscall.ftruncate(_fd, (IntPtr)size);
if (result == -1)
{
var err = Marshal.GetLastWin32Error();
PosixHelper.ThrowLastError(err, "when truncating " + _filename);
}
result = Syscall.fsync(_fd);
if (result == -1)
{
var err = Marshal.GetLastWin32Error();
PosixHelper.ThrowLastError(err, "when fsycning " + _filename);
}
if (PosixHelper.CheckSyncDirectoryAllowed(_filename) && PosixHelper.SyncDirectory(_filename) == -1)
{
var err = Marshal.GetLastWin32Error();
PosixHelper.ThrowLastError(err, "when syncing dir for " + _filename);
}
}
