套接字

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <netdb.h>


#define DEF_STD_ERROR (-1)
#define DEF_BIND_PORT (12455)


#ifndef TRUE
#define TRUE 1
#define FALSE 0
#define BOOL int
#endif


//set socket(TRUE:block, FALSE:no block)

void set_block(int sock,BOOL flag)
{
        int ret;
        if(flag == TRUE)
        {
                ret = fcntl(sock,F_GETFL);
                ret ^= O_NONBLOCK;
                fcntl(sock,F_SETFL,ret);
        }
        else
        {
                ret = fcntl(sock,F_GETFL);
                ret |= O_NONBLOCK;
                fcntl(sock,F_SETFL,ret);
        }
}

int main(int argc,char *argv[])
{
        int ret;
        int sock;
        struct sockaddr_in addr;
        pid_t child;
        char buf[1024];
        int len;
        //create socket
        sock = socket(AF_INET,SOCK_STREAM,0); 
        if(sock == DEF_STD_ERROR)
        {
                printf("%s",strerror(errno));
                return -1;
        }
        //init address
        addr.sin_family = AF_INET;
        addr.sin_port = htons(DEF_BIND_PORT);
        addr.sin_addr.s_addr = inet_addr("192.168.1.127");
        ret = bind(sock,(struct sockaddr*)&addr,sizeof(addr));
        if(ret == DEF_STD_ERROR)
        {
                printf("%s",strerror(errno));
                close(sock);
                return -1;
        }
        //listen
        ret = listen(sock,5);
        if(ret == DEF_STD_ERROR)
        {
                printf("%s",strerror(errno));
                close(sock);
                return -1;
        }
        //set no block
        set_block(sock,FALSE);
        //accept
        while(1)
        {
                ret = accept(sock,NULL,NULL);
                if(ret == DEF_STD_ERROR)
                {
                        if(errno == EAGAIN)
                        {
                                //printf("yi bu...\n");
                                usleep(10);
                                continue;
                        }
                        else
                        {
                                printf("%s",strerror(errno));
                                break;
                        }
                }
                //create child process
                child =fork();
                if(child < 0)
                {
                        send(ret,"now busy,please wait for a moment!",sizeof("now busy,please wait for a moment!"),0);
                        close(ret);
                        printf("%s",strerror(errno));
                        continue;
                }
                else if(child == 0)
                {
                        child = fork();
                        if(child == 0)
                        {
                                close(sock); 
                                set_block(ret,FALSE);
                                while(1)
                                {
                                        len = recv(ret,buf,sizeof(buf),0);
                                        if(len == DEF_STD_ERROR)
                                        {
                                                if(errno == EAGAIN)
                                                {
                                                        usleep(10);
                                                        continue;
                                                }
                                                else
                                                {
                                                         printf("%s",strerror(errno));
                                                         break;
                                                }
                                        }
                                        else if (len == 0)
                                        {
                                                printf("Peer common quit!\n");
                                                break;
                                        }
                                        printf("sock[%d]:%s\n",ret,buf);
                                        send(ret,buf,strlen(buf)+1,0);
                                }
                                close(ret);
                                exit(0);
                        }
                        else
                        {
                                close(ret);
                                close(sock);
                                exit(0);
                        }
                }
                else
                {
                        waitpid(child,0,0);
                        close(ret);
                }
        }
        //close
        close(sock);
        return 0;
}

套接字

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原文地址：http://blog.csdn.net/ingnight/article/details/51336119