/// <summary>Returns the JournalMessage.</summary>
public void Dispose()
{
Clear();
if (s_cachedMessage == null ||
(this._data.Count > s_cachedMessage._data.Count)) // Prefer caching longer _data
{
s_cachedMessage = this;
}
}
internal static JournalMessage Get(bool isEnabled)
{
JournalMessage message = s_cachedMessage;
if (message == null)
{
message = new JournalMessage();
}
else
{
s_cachedMessage = null;
}
message._isEnabled = isEnabled;
return(message);
}
/// <summary>Obtain a cleared JournalMessage. The Message must be Disposed to return it.</summary>
public static JournalMessage GetMessage()
{
return(JournalMessage.Get(IsSupported));
}
/// <summary>
/// Submit a log entry to the journal.
/// </summary>
public static unsafe LogResult Log(LogFlags flags, JournalMessage message)
{
Socket socket = GetJournalSocket();
if (socket == null)
{
if (s_isSupported.Value)
{
return(LogResult.NotAvailable);
}
else
{
return(LogResult.NotSupported);
}
}
if (message.IsEmpty)
{
return(LogResult.Success);
}
int priority = (int)flags & 0xf;
if (priority != 0)
{
message.Append(JournalFieldName.Priority, priority - 1);
}
if (((flags & LogFlags.DontAppendSyslogIdentifier) == LogFlags.None) &&
SyslogIdentifier != null)
{
message.Append(JournalFieldName.SyslogIdentifier, SyslogIdentifier);
}
List <ArraySegment <byte> > data = message.GetData();
int dataLength = data.Count;
if (dataLength > MaxIovs)
{
// We should handle this the same way as EMSGSIZE, which we don't handle atm.
ErrorWhileLogging("size exceeded");
return(LogResult.Size);
}
Span <IOVector> iovs = stackalloc IOVector[dataLength];
Span <GCHandle> handles = stackalloc GCHandle[dataLength];
for (int i = 0; i < data.Count; i++)
{
handles[i] = GCHandle.Alloc(data[i].Array, GCHandleType.Pinned);
iovs[i].Base = handles[i].AddrOfPinnedObject();
iovs[i].Length = new IntPtr(data[i].Count);
}
int sendmsgFlags = 0;
if ((flags & LogFlags.DropWhenBusy) != 0)
{
sendmsgFlags |= MSG_DONTWAIT;
}
LogResult result = LogResult.Success;
fixed(IOVector *pIovs = &MemoryMarshal.GetReference(iovs))
{
bool loop;
do
{
loop = false;
msghdr msg;
msg.msg_iov = pIovs;
msg.msg_iovlen = (SizeT)dataLength;
int rv = sendmsg(socket.Handle.ToInt32(), &msg, sendmsgFlags).ToInt32();
if (rv < 0)
{
int errno = Marshal.GetLastWin32Error();
if (errno == EINTR)
{
loop = true;
}
else if (errno == EAGAIN)
{
result = LogResult.Busy;
}
else
{
result = LogResult.UnknownError;
ErrorWhileLogging($"errno={errno}");
}
}
} while (loop);
}
for (int i = 0; i < handles.Length; i++)
{
handles[i].Free();
}
return(result);
}