golang fork 系统资源共享可行性验证

来源：互联网发布：mac手机铃声编辑：程序博客网时间：2024/06/05 15:48

环境：linux gcc go gdb

如左边代码：

go buildtest.go

./test s

./test c

可见2个.dat日志文件都有输出，说明2个父子进程都有accept成功，进一步说明fork 在golang里面可用，也验证了操作系统的父子进程资源可共享

packagemain

import(

"fmt"

"io"

"net"

"os"

)

#include<unistd.h>

intMyFork()

{

pid_tp =fork();

returnp;

}

import"C"

funchandlerCli(cli net.Conn){

for{

buf:= make([]byte,128)

l,err:= cli.Read(buf)

iferr != nil {

fmt.Println("cli.Readerr")

}else {

buf= buf[:l]

ret,e:= cli.Write(buf)

ife != nil ||ret != l {

fmt.Println("cli.Writeerr")

}

funcmain() {

varpid C.int = C.MyFork()

ifpid != 0 {

os.Exit(0)

}

ifos.Args[1] == "s" {

serv,serr:= net.Listen("tcp4", "127.0.0.1:8082")

ifserr != nil {

fmt.Println("listenerr")

}

iftrue {

C.MyFork()

}

fW,_:= os.OpenFile(fmt.Sprintf("%d.dat", os.Getpid()),os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)

deferfW.Close()

varclinum int64= 0

for{

cli,cerr:= serv.Accept()

ifcerr != nil {

fmt.Println("accepterr")

io.WriteString(fW,"accept err")

continue

}

gohandlerCli(cli)

clinum++

//ifclinum%100 == 0{

//fmt.Println(os.Getpid(),":",clinum)

io.WriteString(fW,fmt.Sprintf("%d", clinum))

//}

}

}else {

cli,err:= net.Dial("tcp4", "127.0.0.1:8082")

iferr != nil {

fmt.Print(err)

return

}

buf:= make([]byte,3)

buf[0]= 'a'

buf[1]= 'b'

buf[2]= 'c'

for{

ret,ew:= cli.Write(buf)

ifew != nil {

fmt.Println(ew)

continue

}

ifret != 3 {

fmt.Println("writeless 3")

}

red,errr:= cli.Read(buf)

ifred != 3 {

fmt.Println("readless 3")

}

iferrr != nil {

fmt.Println(errr)

}

return

}

0 0