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linux_stopper.go
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linux_stopper.go
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// Copyright (C) 2019-2023, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
//go:build linux
// +build linux
// ^ SIGTERM signal is not available on Windows
// ^ syscall.SysProcAttr only has field Pdeathsig on Linux
package subprocess
import (
"context"
"os/exec"
"syscall"
"go.uber.org/zap"
"github.com/ava-labs/avalanchego/utils/logging"
"github.com/ava-labs/avalanchego/utils/wrappers"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/runtime"
)
func NewCmd(path string, args ...string) *exec.Cmd {
cmd := exec.Command(path, args...)
cmd.SysProcAttr = &syscall.SysProcAttr{Pdeathsig: syscall.SIGTERM}
return cmd
}
func stop(ctx context.Context, log logging.Logger, cmd *exec.Cmd) {
waitChan := make(chan error)
go func() {
// attempt graceful shutdown
errs := wrappers.Errs{}
err := cmd.Process.Signal(syscall.SIGTERM)
errs.Add(err)
_, err = cmd.Process.Wait()
errs.Add(err)
waitChan <- errs.Err
close(waitChan)
}()
ctx, cancel := context.WithTimeout(ctx, runtime.DefaultGracefulTimeout)
defer cancel()
select {
case err := <-waitChan:
if err == nil {
log.Debug("subprocess gracefully shutdown")
} else {
log.Error("subprocess graceful shutdown failed",
zap.Error(err),
)
}
case <-ctx.Done():
// force kill
err := cmd.Process.Kill()
log.Error("subprocess was killed",
zap.Error(err),
)
}
}