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add a callback before exit #35

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add a callback before exit #35

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659b668
add a callback before exit
davies Jan 18, 2021
3da5144
add a option to redirect stdout/stderr to a file
davies Jun 29, 2021
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12 changes: 11 additions & 1 deletion daemon.go
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,8 @@ type DaemonAttr struct {
ProgramName string // child's os.Args[0]; copied from parent if empty
CaptureOutput bool // whether to capture stdout/stderr
Files []**os.File // files to keep open in the daemon
Stdout *os.File // redirect stdout/stderr to it
OnExit func(stage int) error
}

/*
Expand Down Expand Up @@ -142,7 +144,12 @@ func MakeDaemon(attrs *DaemonAttr) (io.Reader, io.Reader, error) {
if err != nil {
return fatal(err)
}
files[0], files[1], files[2] = nullDev, nullDev, nullDev
files[0] = nullDev
if attrs.Stdout != nil {
files[1], files[2] = attrs.Stdout, attrs.Stdout
} else {
files[1], files[2] = nullDev, nullDev
}

fd := 3
for _, fPtr := range attrs.Files {
Expand Down Expand Up @@ -209,6 +216,9 @@ func MakeDaemon(attrs *DaemonAttr) (io.Reader, io.Reader, error) {
return fatal(fmt.Errorf("can't create process %s: %s", procName, err))
}
proc.Release()
if attrs.OnExit != nil {
attrs.OnExit(stage)
}
os.Exit(0)
}

Expand Down