【网络编程】服务端产生大量的close_wait状态的进程分析

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #include <unistd.h>
 5 #include <sys/socket.h>
 6 #include <netinet/in.h>
 7 #include <arpa/inet.h>
 8  
 9  
10 #define MAXLINE 80
11 #define SERV_PORT 8000
12  
13  
14 int main(int argc, char *argv[])
15 {
16     struct sockaddr_in servaddr;
17     char str[MAXLINE] = "test ";
18     int sockfd, n;
19  
20  
21     while(1)
22     {
23         sockfd = socket(AF_INET, SOCK_STREAM, 0);
24  
25  
26         bzero(&servaddr, sizeof(servaddr));
27         servaddr.sin_family = AF_INET;
28         inet_pton(AF_INET, "192.168.254.26", &servaddr.sin_addr);
29         servaddr.sin_port = htons(SERV_PORT);
30  
31  
32         connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
33         write(sockfd, str, strlen(str));
34  
35  
36         close(sockfd);
37         sleep(2);
38     }
39  
40  
41     return 0;
42 }

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 #include <iostream>
 5  
 6  
 7 #include <sys/mman.h>
 8 #include <sys/stat.h>        /* For mode constants */
 9 #include <fcntl.h>           /* For O_* constants */
10  
11  
12 #include <unistd.h>
13 #include <arpa/inet.h>
14  
15  
16 using namespace std;
17  
18  
19 #define LENGTH 128
20 #include "netinet/in.h"
21 #define MAXLINE 80
22 #define SERV_PORT 8000
23  
24  
25 int main(int argc,char** argv)
26 {
27     struct sockaddr_in servaddr, cliaddr;
28     socklen_t cliaddr_len;
29     int listenfd;
30     char buf[MAXLINE];
31     char str[INET_ADDRSTRLEN];
32     //int i, n;
33     int  n;
34  
35  
36     //创建socket
37     listenfd = socket(AF_INET, SOCK_STREAM, 0);
38  
39  
40     //设置端口重用
41     int opt = 1;
42     setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
43  
44  
45     //fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFL, 0) | O_NONBLOCK);
46  
47  
48     bzero(&servaddr, sizeof(servaddr));
49     servaddr.sin_family = AF_INET;
50  
51  
52     inet_pton(AF_INET,"192.168.254.26",&(servaddr.sin_addr.s_addr));
53     //servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
54     servaddr.sin_port = htons(SERV_PORT);
55  
56  
57     bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
58  
59  
60     listen(listenfd, 20);
61  
62  
63     printf("Accepting connections ...\n");
64     while (1)
65     {
66         cliaddr_len = sizeof(cliaddr);
67         int connfd = accept(listenfd,
68                 (struct sockaddr *)&cliaddr, &cliaddr_len);
69  
70  
71         //while(1)
72         {
73             n = recv(connfd, buf, MAXLINE,0);
74             if (n == 0)
75             {
76                 //对端主动关闭
77                 printf("the other side has been closed.\n");
78                 //break;
79             }
80             printf("received from %s at PORT %d len = %d\n",
81                    inet_ntop(AF_INET, &cliaddr.sin_addr, str, sizeof(str)),
82                    ntohs(cliaddr.sin_port),n);
83         }
84         //测试:模拟CLOSE_WAIT状态时，将close(connfd);这句代码注释
85  
86         //close(connfd);
87     }
88  
89  
90      return 0;
91 }