chapter5
5.1 概述
5.2 TCP回射服务器程序:main函数
int main(int argc, char **argv)
{
int listenfd,connfd;
pid_t childpid;
socklen_t clilen;
struct sockaddr_in, cliaddr, servaddr;
listenfd = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_famlily = AF+INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
Bind(listenfd, (SA*)&servaddr, sizeof(servaddr));
Listne(listenfd,LISTENQ);
for(;;)
{
client = sizeof(cliaddr);
connfd = Accept(listenfd, (SA*)&cliaddr, &client);
if( (childpit = Fork()) == 0)
{
Close(listenfd);
str_echo(connfd);
exit(0);
}
Close(connfd);
}
}
5.3 TCP 回射服务器程序:str_echo函数
void str_echo(int sockfd)
{
ssize_t n;
char buf[MAXLINE];
again:
while( (n = read(sockfd, buf, MAXLINE)) > 0)
Writen(sockfd,buf, n);
if(n < 0 && error =- EINTR)
goto again;
else if(n < 0)
err_sys("error");
}
5.4 TCP 回射客户程序:main函数
5.5
5.6 正常启动
5.7 正常终止
5.8 POSIX信号
5.9 处理SIGCHILD信号
5.10 wait和waitpid函数
#include <sys/wait.h>
pid_t wait(int *status);
pid_t waitpid(pit_t pid, int *status, int options);