C language implementation of simple socket communication instance _c language

This article describes the C language to achieve a simple socket communication method, share for everyone to reference. The implementation methods are as follows:

The server-side code is as follows:

/* ============================================================================ name:server.c author:king Version: Copyright:your copyright Notice Description:hello World in C, Ansi-style =============================================
=============================== * #include <stdlib.h> #include <pthread.h> #include <sys/socket.h>  #include <sys/types.h> #include <netinet/in.h> #include <arpa/inet.h>/inet (3) functions * * #include

<stdlib.h> #include <errno.h> #include <stdio.h> #include <string.h> int handle (int point); int main (void) {int SFD, ind; struct sockaddr_in addr; struct sockaddr_in clent; char resv[1024], sendbuf[1024]; char buf
[1024];

char * myaddr = "192.168.231.128"; int ret;
The return value is set socklen_t lent;
int pid; addr.sin_family = af_inet; IPV4 Internet Protocols Addr.sin_port = htons (5050); Here enter the server port number addr.sin_addr.s_addr = inet_addr (myaddr);; Inaddr_any represents the native IP//FETCH socket descriptor, IPV4ASD printf ("Socket start \ n");

SFD = socket (af_inet, sock_stream, 0);
if (SFD < 0) {printf ("Socket error \ n"); return-1} printf ("Bind start \ n"); Link the socket to the specified port if (bind (SFD, struct sockaddr *) &addr, sizeof (struct sockaddr)) < 0) {printf ("Bind error \ n"); ret
urn-1;
//Listener Socket printf ("Listen start \");

if (Listen (SFD, 1024) < 0) {printf ("Listen error \ n"); return-1;} for (;;) {//Accept information from the client printf ("Accept start \ n"); memset (&clent, 0, sizeof (clent)); lent = sizeof (clent); ind = Accept (SFD, (s
Truct sockaddr *) &clent, &lent);

if (Ind < 0) {printf ("Accept error%d \ n", Ind); return-1;}
printf ("infor \ n");

printf ("Clent addr%s porit%d\n", Inet_ntop (Af_inet, &clent.sin_addr, buf, sizeof (BUF)), Ntohs (Clent.sin_port));

PID = fork (); if (PID = = 0) {//subprocess close (SFD), handle (IND);} else if (PID < 0) {//error close (IND);} else {//parent process}} return EXI

t_success;

int handle (int point) {int retn; char buf[1024]; for (;;) {RETN = read (point, buf, sizeof (BUF)); if (Retn < 0) {printf ("read error \ n"); Close (point), break;} else if (Retn = = 0) {printf ("Client exit \ n");
OINT);
Break

printf ("client:%s\n", buf);
if (strcmp ("Exit", buf) = = 0) {printf ("Exit \ n"); close (point); return 0;}}
return 0;

 }

The

client code is as follows:

/* ============================================================================ name:client.c author:king Ve Rsion:Copyright:Your Copyright notice Description:hello World in C, Ansi-style =============================== ============================================= * * #include <stdio.h> #include <stdlib.h> #include <sys/

socket.h> #include <netinet/in.h> #include <arpa/inet.h>/* INET (3) functions */int handle (int fd);
  int main (void) {int nsd;

  Char buf[1024];
  char * myaddr = "192.168.231.128";

  struct sockaddr_in addr;
  printf ("Welcome to echo client\n");
  NSD = socket (af_inet, sock_stream, 0);
  printf ("Connect start1 \ n");
  Bzero (addr, sizeof (*ADDR));
  memset (&addr,0,sizeof (addr));
  printf ("Connect start2 \ n");
  addr.sin_family = af_inet;
  Addr.sin_port = htons (5050);

  ADDR.SIN_ADDR.S_ADDR=INET_ADDR (MYADDR);
  printf ("Connect start3 \ n"); if (Connect (NSD, struct sockaddr *) &addr, sizeof (StruCT sockaddr)) < 0) {printf ("Connect error \ n");
  return-1;
  Sleep (5);
  printf ("Handle start\n");
  Handle (NSD);
  Close (NSD);
return exit_success;

  int handle (int fd) {char sendl[1024], rev[1024];

  int retn; for (;;)
    {memset (sendl,0,sizeof (Sendl));
    memset (Rev. Rev,0,sizeof (rev));
    if (fgets (Sendl, 1024, stdin) = = NULL) {break;
    }//printf ("Wirte start\n");
    Write (FD, Sendl, strlen (Sendl));

  Read (FD, Rev,strlen (rev));
return 0;

 }

Attention:
int Connect (int sockfd, const struct SOCKADDR *addr,socklen_t Addrlen);
Remember, it must be a value addrlen.
Accept socklen_t *addrlen If a pointer

I hope this article will help you with the learning of C language network programming.