#include <stdio.h>
#include <stdlib.h> /* exit() */
#include <strings.h> /* bzero(), bcopy() */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
int main(int argc, char **argv){
int sockfd = socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in my_addr;
bzero(&my_addr,sizeof my_addr);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(9999);
my_addr.sin_addr.s_addr = INADDR_ANY;
int res;
res = bind(sockfd,(struct sockaddr *)&my_addr,sizeof (struct sockaddr_in));
res = listen(sockfd,5);
while (1) { // shouldn't this while cycle "keep alive" the server to wait for new clients?
struct sockaddr_in cli_addr;
bzero(&cli_addr,sizeof cli_addr);
socklen_t cli_size = sizeof (struct sockaddr_in);
int clisockfd = accept(sockfd,(struct sockaddr *)&cli_addr,&cli_size);
while (1) {
char buf[100] = "";
int b_recv = recv(clisockfd, buf, 100, 0);
printf("%d %d\n",sockfd,b_recv);
printf("%s\n",buf);
char string[] = "test";
send(clisockfd,string,sizeof string,0))
}
}
}
如果我用 netcat 測驗我的服務器，如果我關閉 netcat，服務器就會退出。為什么？外部while回圈不應該讓它保持活力嗎？為什么以及如何避免服務器關閉？
uj5u.com熱心網友回復：
如果您仔細檢查，SIGPIPE當您從客戶端關閉連接時，服務器將通過信號終止。
發生這種情況是因為您沒有檢查關閉連接事件，而是嘗試寫入關閉連接。
當recv回傳0你不應該試圖寫入連接的插座。相反，您應該關閉套接字并跳出內部recv/send回圈。
while (1) {
char buf[100] = "";
int b_recv = recv(clisockfd, buf, 100, 0);
printf("%d %d\n",clisockfd,b_recv); // Print the connection socket instead
if (b_recv <= 0) {
// Error or closed connection
close(clisockfd);
break; // Go back to the outer loop, wait for new connections
}
printf("%s\n",buf);
char string[] = "test";
send(clisockfd,string,sizeof string,0))
}
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