go exec 源码
golang exec 代码
文件路径：/src/runtime/testdata/testprogcgo/exec.go
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !plan9 && !windows
// +build !plan9,!windows
package main
/*
#include <stddef.h>
#include <signal.h>
#include <pthread.h>
// Save the signal mask at startup so that we see what it is before
// the Go runtime starts setting up signals.
static sigset_t mask;
static void init(void) __attribute__ ((constructor));
static void init() {
sigemptyset(&mask);
pthread_sigmask(SIG_SETMASK, NULL, &mask);
}
int SIGINTBlocked() {
return sigismember(&mask, SIGINT);
}
*/
import "C"
import (
"fmt"
"io/fs"
"os"
"os/exec"
"os/signal"
"sync"
"syscall"
)
func init() {
register("CgoExecSignalMask", CgoExecSignalMask)
}
func CgoExecSignalMask() {
if len(os.Args) > 2 && os.Args[2] == "testsigint" {
if C.SIGINTBlocked() != 0 {
os.Exit(1)
}
os.Exit(0)
}
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGTERM)
go func() {
for range c {
}
}()
const goCount = 10
const execCount = 10
var wg sync.WaitGroup
wg.Add(goCount*execCount + goCount)
for i := 0; i < goCount; i++ {
go func() {
defer wg.Done()
for j := 0; j < execCount; j++ {
c2 := make(chan os.Signal, 1)
signal.Notify(c2, syscall.SIGUSR1)
syscall.Kill(os.Getpid(), syscall.SIGTERM)
go func(j int) {
defer wg.Done()
cmd := exec.Command(os.Args[0], "CgoExecSignalMask", "testsigint")
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
// An overloaded system
// may fail with EAGAIN.
// This doesn't tell us
// anything useful; ignore it.
// Issue #27731.
if isEAGAIN(err) {
return
}
fmt.Printf("iteration %d: %v\n", j, err)
os.Exit(1)
}
}(j)
signal.Stop(c2)
}
}()
}
wg.Wait()
fmt.Println("OK")
}
// isEAGAIN reports whether err is an EAGAIN error from a process execution.
func isEAGAIN(err error) bool {
if p, ok := err.(*fs.PathError); ok {
err = p.Err
}
return err == syscall.EAGAIN
}
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