lechu/go-serial
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If the timeout is set to NoTimeout, make Read wait forever.

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Otherwise the maximul allowed timeout is 0x7FFFFFFF milliseconds,
equivalent to about 24.85 days.
This patch will make a transparent repeated read in case this long
timeout should ever happen.
This commit is contained in:
Cristian Maglie
2025-03-12 20:52:40 +01:00
parent fb4b111d50
commit 1ff9b6fa9a
1 changed files with 32 additions and 21 deletions
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53
serial_windows.go
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@@ -28,8 +28,9 @@ import (
)
type windowsPort struct {
mu sync.Mutex
handle windows.Handle
mu sync.Mutex
handle windows.Handle
hasTimeout bool
}
func nativeGetPortsList() ([]string, error) {
@@ -72,26 +73,33 @@ func (port *windowsPort) Read(p []byte) (int, error) {
}
defer windows.CloseHandle(ev.HEvent)
err = windows.ReadFile(port.handle, p, &readed, ev)
if err == windows.ERROR_IO_PENDING {
err = windows.GetOverlappedResult(port.handle, ev, &readed, true)
}
switch err {
case nil:
// operation completed successfully
case windows.ERROR_OPERATION_ABORTED:
// port may have been closed
return int(readed), &PortError{code: PortClosed, causedBy: err}
default:
// error happened
return int(readed), err
}
if readed > 0 {
return int(readed), nil
}
for {
err = windows.ReadFile(port.handle, p, &readed, ev)
if err == windows.ERROR_IO_PENDING {
err = windows.GetOverlappedResult(port.handle, ev, &readed, true)
}
switch err {
case nil:
// operation completed successfully
case windows.ERROR_OPERATION_ABORTED:
// port may have been closed
return int(readed), &PortError{code: PortClosed, causedBy: err}
default:
// error happened
return int(readed), err
}
if readed > 0 {
return int(readed), nil
}
// Timeout
return 0, nil
// Timeout
port.mu.Lock()
hasTimeout := port.hasTimeout
port.mu.Unlock()
if hasTimeout {
return 0, nil
}
}
}
func (port *windowsPort) Write(p []byte) (int, error) {
@@ -304,9 +312,12 @@ func (port *windowsPort) SetReadTimeout(timeout time.Duration) error {
commTimeouts.ReadTotalTimeoutConstant = uint32(ms)
}
port.mu.Lock()
defer port.mu.Unlock()
if err := windows.SetCommTimeouts(port.handle, commTimeouts); err != nil {
return &PortError{code: InvalidTimeoutValue, causedBy: err}
}
port.hasTimeout = (timeout != NoTimeout)
return nil
}