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Merge pull request #33 from kazeburo/pidfile
Introduced pidfile
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Original file line number | Diff line number | Diff line change |
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package pidfile | ||
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import ( | ||
"fmt" | ||
"io/ioutil" | ||
"os" | ||
"path/filepath" | ||
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"github.com/pkg/errors" | ||
) | ||
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// WritePid : write pid to given file | ||
func WritePid(pidfile string) error { | ||
dir, filename := filepath.Split(pidfile) | ||
tmpfile, err := ioutil.TempFile(dir, filename+".*") | ||
if err != nil { | ||
return errors.Wrap(err, "Could not create tempfile") | ||
} | ||
_, err = tmpfile.WriteString(fmt.Sprintf("%d", os.Getpid())) | ||
if err != nil { | ||
tmpfile.Close() | ||
os.Remove(tmpfile.Name()) | ||
return errors.Wrap(err, "Could not write pid to tempfile") | ||
} | ||
tmpfile.Close() | ||
err = os.Rename(tmpfile.Name(), pidfile) | ||
if err != nil { | ||
os.Remove(tmpfile.Name()) | ||
return errors.Wrap(err, "Could not rename pidfile") | ||
} | ||
return nil | ||
} |