聊聊Linux fork多进程并发服务器模型

//子进程善后
void sigChildFun(int sigNO)
{
pid_t pid;
int stat;
while((pid = waitpid(-1, &stat, WNOHANG)) > 0); // 循环收尸(僵尸进程), 此时waitpid不会阻塞
}

main()
{
pid_t pid;
int fdListen, fdConnect;

fdListen = socket(...);
bind(fdListen, ...);
listen(fdListen, ...);

signal(SIGCHLD, sigChildFun);

while (1)
{
fdConnect = accept(fdListen, ...); //父进程负责监听
if ((pid = fork()) == 0)    //子进程
{
close(fdListen);        //子进程不需要监听，关闭共享的文件描述符，使引用计数-1
doAction();             //子进程处理函数
close(fdConnect);       //处理结束后关闭连接的socket
exit(0);
}
close(fdConnect);           //父进程不需要连接socket，关闭使其由子进程管理，引用计数-1
}
close(fdListen);              //结束后父进程关闭监听socket
}