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Do not call seek on named pipes #81

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Do not call seek on named pipes #81

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17 changes: 16 additions & 1 deletion tail.go
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Original file line number Diff line number Diff line change
Expand Up @@ -372,6 +372,17 @@ func (tail *Tail) tailFileSync() {
// moved or truncated. When moved or deleted - the file will be
// reopened if ReOpen is true. Truncated files are always reopened.
func (tail *Tail) waitForChanges() error {
if tail.Pipe {
// If input is a fifo, we can reopen immediately
tail.Logger.Printf("Re-opening named pipe %s ...", tail.Filename)
if err := tail.reopen(); err != nil {
return err
}
tail.Logger.Printf("Successfully reopened pipe %s", tail.Filename)
tail.openReader()
return nil
}

if tail.changes == nil {
pos, err := tail.file.Seek(0, io.SeekCurrent)
if err != nil {
Expand Down Expand Up @@ -426,7 +437,11 @@ func (tail *Tail) openReader() {
}

func (tail *Tail) seekEnd() error {
return tail.seekTo(SeekInfo{Offset: 0, Whence: io.SeekEnd})
if !tail.Pipe {
return tail.seekTo(SeekInfo{Offset: 0, Whence: io.SeekEnd})
} else {
return nil
}
}

func (tail *Tail) seekTo(pos SeekInfo) error {
Expand Down