Elijah/CollabVM-Agent-Windows
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add some error checking, get a new handle if the old one is invalid

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Elijah R 2023-12-04 12:22:23 -05:00
parent f91090a7b0
commit e48ce2f9cf
1 changed files with 16 additions and 2 deletions
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18
CollabVMAgent/VirtIOSerial.cs
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@ -54,6 +54,20 @@ namespace CollabVMAgent
if (readCancel.IsCancellationRequested) return;
Thread.Sleep(READ_INTERVAL);
ReadFile(viohnd, sizebuf, 4, out read, IntPtr.Zero);
var err = Marshal.GetLastWin32Error();
if (err != 0)
{
#if DEBUG
Console.WriteLine($"Got error {err} while trying to read from serial port");
#endif
switch (err)
{
case 6:
CloseHandle(viohnd);
viohnd = CreateFile(DevicePath, FileAccess.ReadWrite, 0, IntPtr.Zero, FileMode.Open, FileAttributes.Normal, IntPtr.Zero);
break;
}
}
}
uint size = BitConverter.ToUInt32(sizebuf, 0);
#if DEBUG
@ -131,7 +145,7 @@ namespace CollabVMAgent
}
[DllImport("setupapi.dll", CharSet = CharSet.Auto)]
[DllImport("setupapi.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr SetupDiGetClassDevs(
ref Guid ClassGuid,
IntPtr Enumerator,
@ -174,7 +188,7 @@ namespace CollabVMAgent
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool ReadFile(IntPtr hFile, [Out] byte[] lpBuffer, uint nNumberOfBytesToRead, out uint lpNumberOfBytesRead, IntPtr lpOverlapped);
[DllImport("kernel32.dll")]
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool WriteFile(IntPtr hFile, byte[] lpBuffer, uint nNumberOfBytesToWrite, out uint lpNumberOfBytesWritten, IntPtr lpOverlapped);
[DllImport("kernel32.dll", SetLastError = true)]