mirror of
https://github.com/google/gops.git
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128 lines
2.6 KiB
Go
128 lines
2.6 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Program gops is a tool to list currently running Go processes.
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package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"github.com/google/gops/internal/objfile"
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ps "github.com/keybase/go-ps"
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)
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const helpText = `Usage: gops is a tool to list and diagnose Go processes.
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gops Lists all Go processes currently running.
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gops [cmd] -p=<pid> See the section below.
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Commands:
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gc Runs the garbage collector and blocks until successful.
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stack Prints the stack trace.
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memstats Prints the garbage collection stats.
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version Prints the Go version used to build the program.
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pprof-heap Reads the heap profile and launches "go tool pprof".
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pprof-mem Reads the CPU profile and launches "go tool pprof".
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help Prints this help text.
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All commands require the agent running on the Go process.
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`
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// TODO(jbd): add link that explains the use of agent.
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func main() {
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if len(os.Args) < 2 {
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processes()
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return
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}
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cmd := os.Args[1]
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if cmd == "help" {
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usage("")
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}
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fn, ok := cmds[cmd]
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if !ok {
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usage("unknown subcommand")
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}
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var pid int
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flag.IntVar(&pid, "p", -1, "")
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flag.CommandLine.Parse(os.Args[2:])
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if pid == -1 {
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usage("missing -p=<pid> flag")
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}
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if err := fn(pid); err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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}
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func processes() {
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pss, err := ps.Processes()
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if err != nil {
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log.Fatal(err)
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}
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var undetermined int
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for _, pr := range pss {
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if pr.Pid() == 0 {
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// ignore system process
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continue
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}
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name, err := pr.Path()
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if err != nil {
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undetermined++
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continue
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}
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ok, err := isGo(name)
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if err != nil {
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// TODO(jbd): worth to report the number?
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continue
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}
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if ok {
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// TODO(jbd): List if the program is running the agent.
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fmt.Printf("%d\t%v\t(%v)\n", pr.Pid(), pr.Executable(), name)
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}
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}
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if undetermined > 0 {
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fmt.Printf("\n%d processes left undetermined\n", undetermined)
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}
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}
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func isGo(executable string) (ok bool, err error) {
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obj, err := objfile.Open(executable)
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if err != nil {
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return false, err
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}
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defer obj.Close()
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symbols, err := obj.Symbols()
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if err != nil {
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return false, err
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}
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// TODO(jbd): find a faster way to determine Go programs.
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for _, s := range symbols {
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if s.Name == "runtime.buildVersion" {
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return true, nil
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}
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}
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return false, nil
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}
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func usage(msg string) {
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if msg != "" {
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fmt.Printf("gops: %v\n", msg)
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}
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fmt.Fprintf(os.Stderr, "%v\n", helpText)
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os.Exit(1)
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}
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