57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package notify implements sending signals (such as SIGUSR1) to processes.
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package notify
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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)
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var numericRe = regexp.MustCompile(`^[0-9]+$`)
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func Process(name string, sig os.Signal) error {
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fis, err := ioutil.ReadDir("/proc")
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if err != nil {
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return err
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}
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for _, fi := range fis {
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if !fi.IsDir() {
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continue
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}
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if !numericRe.MatchString(fi.Name()) {
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continue
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}
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b, err := ioutil.ReadFile(filepath.Join("/proc", fi.Name(), "cmdline"))
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if err != nil {
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if os.IsNotExist(err) {
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continue // process vanished
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}
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return err
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}
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if !strings.Contains(string(b), name) {
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continue
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}
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pid, _ := strconv.Atoi(fi.Name()) // already verified to be numeric
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p, _ := os.FindProcess(pid)
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return p.Signal(sig)
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}
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return nil
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}
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