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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="54.htm">上一层</a>][<a href="85.htm">下一篇</a>]
<hr><p align="left"><small>发信人: clown (梧桐叶), 信区: UNP <br>
标 题: 非阻塞accept测试程序 <br>
发信站: UNIX编程 (2001年09月24日21:44:05 星期一), 站内信件 <br>
<br>
//server <br>
#include <netinet/in.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <string.h> <br>
#include <signal.h> <br>
#include <sys/wait.h> <br>
#include <sys/time.h> <br>
#include <unistd.h> <br>
#include <errno.h> <br>
<br>
#define SERV_PORT 8000 <br>
<br>
void sig_chld(int signo); <br>
void str_echo(int sockfd); <br>
<br>
int main() <br>
{ <br>
int listenfd, connfd; <br>
pid_t childpid; <br>
socklen_t clilen; <br>
struct sockaddr_in cliaddr, servaddr; <br>
int optval, optlen; <br>
fd_set rset; <br>
sigset_t sigset; <br>
<br>
if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { <br>
printf("create socket error\n"); <br>
exit(1); <br>
} <br>
memset(&servaddr, 0, sizeof(servaddr)); <br>
servaddr.sin_family = AF_INET; <br>
servaddr.sin_port = htons(SERV_PORT); <br>
servaddr.sin_addr.s_addr = htonl(INADDR_ANY); <br>
<br>
optval = 1; <br>
optlen = sizeof(int); <br>
if(setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (const void *)&optval, o <br>
ptlen) == -1) { <br>
printf("setsockopt error\n"); <br>
exit(1); <br>
} <br>
<br>
if(bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) { <br>
printf("bind error\n"); <br>
exit(1); <br>
} <br>
if(listen(listenfd, 5) < 0) { <br>
printf("listen error\n"); <br>
exit(1); <br>
} <br>
signal(SIGCHLD, sig_chld); <br>
sigfillset(&sigset); <br>
sigdelset(&sigset, SIGCHLD); <br>
sigprocmask(SIG_BLOCK, &sigset, NULL); <br>
for( ; ; ) { <br>
FD_ZERO(&rset); <br>
FD_SET(listenfd, &rset); <br>
if(select(listenfd+1, &rset, NULL, NULL, NULL) <= 0) { <br>
if(errno == EINTR){ <br>
perror("in EINTR, select"); <br>
continue; <br>
} <br>
} <br>
perror("select"); <br>
exit(1); <br>
} <br>
if(FD_ISSET(listenfd, &rset)) { <br>
printf("listenfd is readable\n"); <br>
sleep(3); <br>
clilen = sizeof(cliaddr); <br>
if((connfd = accept(listenfd, (struct sockaddr *)&cliaddr, &clilen)) <br>
< 0) <br>
{ <br>
perror("accept"); <br>
exit(1); <br>
} <br>
if((childpid = fork()) == 0) { //child process <br>
close(listenfd); <br>
str_echo(connfd); <br>
exit(0); <br>
} <br>
close(connfd); //parent process <br>
} <br>
} <br>
close(listenfd); <br>
return 0; <br>
} <br>
<br>
void str_echo(int sockfd) <br>
{ <br>
ssize_t n; <br>
char line[32]; <br>
for( ; ; ) { <br>
if((n = recv(sockfd, line, 31, 0)) == 0) <br>
return; //connection closed <br>
else if( n < 0) { <br>
perror("receive"); <br>
return; <br>
} <br>
line[n] = '\0'; <br>
printf("%s", line); <br>
if(send(sockfd, line, strlen(line), 0) < 0) { <br>
perror("send"); <br>
return; <br>
} <br>
} <br>
} <br>
} <br>
<br>
void sig_chld(int signo) <br>
{ <br>
pid_t pid; <br>
int stat; <br>
while((pid = waitpid(-1, &stat, WNOHANG)) > 0) <br>
printf("child %d terminated\n", pid); <br>
return; <br>
} <br>
<br>
<br>
//*************************************************// <br>
//client <br>
#include <stdio.h> <br>
#include <netinet/in.h> <br>
#include <arpa/inet.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <string.h> <br>
#include <sys/time.h> <br>
#include <errno.h> <br>
<br>
<br>
#define SERV_PORT 8000 <br>
<br>
int main(int argc, char **argv) <br>
{ <br>
int i, sockfd; <br>
struct sockaddr_in servaddr; <br>
struct linger ling; <br>
<br>
if(argc != 2) { <br>
printf("usage: argv[0] <IPaddress>\n"); <br>
exit(1); <br>
} <br>
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) { <br>
printf("create socket error\n"); <br>
exit(1); <br>
} <br>
memset(&servaddr, 0, sizeof(servaddr)); <br>
servaddr.sin_family = AF_INET; <br>
servaddr.sin_port = htons(SERV_PORT); <br>
if(inet_pton(AF_INET, argv[1], &servaddr.sin_addr) == 0) { <br>
printf("%s is not a valid ip address\n", argv[1]); <br>
exit(1); <br>
} <br>
if(connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) { <br>
perror("connect"); <br>
exit(1); <br>
} <br>
ling.l_onoff = 1; <br>
ling.l_linger = 0; <br>
if(setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling)) < 0) <br>
printf("setsockopt error\n"); <br>
close(sockfd); <br>
return 0; <br>
} <br>
<br>
<br>
执行结果（服务器段）： <br>
listenfd is readable <br>
//wait for 3 seconds <br>
receive: Connection reset by peer <br>
child 8666 terminated <br>
in EINTR, select: Interrupted system call <br>
<br>
<br>
-- <br>
易朽的是生命，似那转瞬即谢的花朵；然而永存的，是对未来的渴望， <br>
是那生生世世传递下来的，不朽的，生的激情。每一朵勇敢开放的花， <br>
都是一个死亡唇边的微笑。 <br>
※ 来源:·UNIX编程 www.tiaozhan.com/unixbbs/·[FROM: 211.69.205.23] <br>
</small><hr>
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