Socket Primer-Client-side ejection program

Result output:
------------------------------------------------------
Client:
[Email protected]:~/public/c$./postbackcli.out 127.0.0.1
Connect OK
Aaa
Aaa
bbbbbbbbbbbbbbbbbbbbbbbbbbbbb
bbbbbbbbbbbbbbbbbbbbbbbbbbbbb
C
C
#
Close OK
[Email protected]:~/public/c$
------------------------------------------------------
Server-side:
[Email protected]:~/public/c$./postbacksrv.out
======waiting for client ' s request======
from:127.0.0.1,port:45050
---------Gorgeous split-line---------
Postbackcli.c

The main function in the detailed comments can see the blogger-Get the server Time instance-blog, with more detailed comments//part of the details of the code is more hasty, Bo Master new introduction, do not spray #include<stdio.h> #include <stdlib.h > #include <string.h> #include <errno.h> #include <sys/types.h> #include <sys/socket.h> #     include<netinet/in.h> #define MAXLINE 4096 void Str_cli (FILE *fp,int SOCKFD); int main (int argc, char** argv) {     int SOCKFD, N,rec_len;     Char recvline[4096], sendline[4096];     Char Buf[maxline];         struct sockaddr_in servaddr;     if (argc! = 2) {printf ("Usage:./client \ n");     Exit (0); } if ((SOCKFD = socket (af_inet, sock_stream, 0)) < 0) {printf ("Create Socket Error:%s (errno:%d) \ n", Strer     Ror (errno), errno);     Exit (0);     } memset (&servaddr, 0, sizeof (SERVADDR));     servaddr.sin_family = af_inet;     Servaddr.sin_port = htons (8000);     if (Inet_pton (Af_inet, argv[1], &servaddr.sin_addr) <= 0) {printf ("Inet_pton error for%s\n", argv[1]);     Exit (0); } if (Connect (sockfd, struct sockaddr*) &servaddr, sizeof (SERVADDR)) < 0) {printf ("Connect Error:%s (errno:%d) \ n", Strerror (errno), errno);     Exit (0);    } printf ("Connect ok\n");    STR_CLI (STDIN,SOCKFD);     Close (SOCKFD);    printf ("Close ok\n"); Exit (0); }//Callback handler void Str_cli (FILE *fp,int sockfd) {Char sendline[maxline],recvline[maxline];//defines two buffers while (Fgets (Sendlin E,MAXLINE,FP) = NULL)//from the standard input input to the sendline {if (sendline[0] = = ' # ') break;//if the input # exits the loop and ends the callback program write (sockfd,s Endline,strlen (Sendline));//writes the data in the sendline buffer to "socket" read (sockfd,recvline,maxline);//Read data from socket to Recvline fputs (recv Line,stdout);//read from the Recvline buffer to the standard output bzero (recvline,sizeof (Recvline));//clear the Accept buffer, each time is the latest data "should be aware of"}}

Postbacksrv.c

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sys/ types.h> #include <sys/socket.h> #include <netinet/in.h> #define DEFAULT_PORT 8000//default port #define MAXLINE     4096 void Str_echo (int sockfd); int main (int argc, char** argv) {int socket_fd, CONNECT_FD;     struct sockaddr_in servaddr,cliaddr;     Char Buff[maxline],temp[maxline];    int n;     uint32_t Len; Initialize the socket if (SOCKET_FD = socket (af_inet, sock_stream, 0)) = =-1) {printf ("Create Socket Error:%s (errno:     %d) \ n ", Strerror (errno), errno);     Exit (0);    }//Initialize memset (&servaddr, 0, sizeof (SERVADDR));     servaddr.sin_family = af_inet;     SERVADDR.SIN_ADDR.S_ADDR = htonl (Inaddr_any),//IP address is set to Inaddr_any, the system automatically gets the IP address of the machine. Servaddr.sin_port = htons (default_port);//Set the port to Default_port//bind the local address to the created socket on the IF (bind (socket_fd, struct sock addr*) &servaddr, sizeof (servaddr)) = = 1) {printf ("Bind socket Error:%s (ERRNO:%d) \ n ", Strerror (errno), errno);     Exit (0); }//Start listening for client connections if (listen (socket_fd) = =-1) {printf ("Listen socket Error:%s (errno:%d) \ n", Strerror (Errn     o), errno);     Exit (0);     } printf ("======waiting for client ' s request======\n");    while (1) {len=sizeof (CLIADDR);     Blocking until there is a client connection connect_fd = Accept (socket_fd, (struct sockaddr *) &cliaddr,&len);    Send the response data to the client if (!fork ())//Enter the child process, the child process service terminates when the parent process will send a SIGCHLD signal, the parent process is not processed, the child process into a zombie state, must clean up the zombie state, where the UNIX signal is involved in Li.               {//the child process closes the listener socket Close (SOCKET_FD) within it;        Str_echo (CONNECT_FD); Output Customer Agreement information printf ("\nfrom:%s,port:%d\n", (char *) inet_ntop (af_inet,&cliaddr.sin_addr,temp,sizeof (temp)), Ntohs     (Cliaddr.sin_port));      Close (CONNECT_FD);       Exit (0);     } close (CONNECT_FD); } close (SOCKET_FD);    } void Str_echo (int sockfd) {ssize_t n;    Char Buf[maxline];    while ((N=read (sockfd,buf,maxline)) >0) write (sockfd,buf,n); if (n<0 &AMP;&Amp ERRNO==EINTR) perror ("str_echo:red error");}

　　

Socket Primer-Client-side ejection program