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subgraph-oz/child.go

46 lines
781 B

package oz
import (
"syscall"
"github.com/op/go-logging"
"os"
"os/signal"
)
func ReapChildProcs(log *logging.Logger, callback func(int, syscall.WaitStatus)) chan os.Signal {
sigs := make(chan os.Signal, 3)
signal.Notify(sigs, syscall.SIGCHLD)
go func() {
for {
<-sigs
handleSIGCHLD(log, callback)
}
}()
return sigs
}
func handleSIGCHLD(log *logging.Logger, callback func(int, syscall.WaitStatus)) {
var wstatus syscall.WaitStatus
for {
pid,err := syscall.Wait4(-1, &wstatus, syscall.WNOHANG, nil)
switch err {
case syscall.ECHILD:
return
case syscall.EINTR:
case nil:
if pid == 0 {
return
}
callback(pid, wstatus)
default:
if log != nil {
log.Warning("syscall.Wait4() returned error: %v", err)
}
return
}
}
}