C语言 socket编程(一)

link管理

链接快照平台

输入网页链接，自动生成快照
标签化管理网页链接

相关文章推荐

宽容的莲藕 · 万字长文带你深入理解协程｜业界设计和实现的决 ...· 2 周前 ·

曾经爱过的南瓜 · Unable to open socket ...· 1 周前 ·

沉着的水桶 · Socket 程式設計指南 — ...· 1 周前 ·

风流的日记本 · php数组怎么判断某元素是否存在_PHP百科 ...· 3 月前 ·

爱逃课的牛腩 · 北京经济技术开发区2018年工作计划_工作计 ...· 1 年前 ·

冷冷的棒棒糖 · 《十大元帅轶事》书摘：林彪患病之谜(附图)_ ...· 1 年前 ·

追风的手套 · 批量下载和上传 - Microsoft ...· 1 年前 ·

讲道义的猴子 · mysql ...· 1 年前 ·

zfl9's blog

           
                                  #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#define LISTEN_PORT 8080
#define BUF_SIZE 128
int main(void){
    int listenfd;
    if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
        perror("create_listenfd error");
        exit(EXIT_FAILURE);
    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(LISTEN_PORT);
    if(bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0){
        perror("bind_listenfd error");
        exit(EXIT_FAILURE);
    if(listen(listenfd, SOMAXCONN) < 0){
        perror("listen_listenfd error");
        exit(EXIT_FAILURE);
    int connfd;
    struct sockaddr_in peeraddr;
    socklen_t peerlen = sizeof(peeraddr);
    char buf[BUF_SIZE];
    int nbuf;
    for(;;){
        if((connfd = accept(listenfd, (struct sockaddr *)&peeraddr, &peerlen)) < 0){
            perror("accept_listenfd error");
            continue;
        nbuf = recv(connfd, buf, BUF_SIZE, 0);
        buf[nbuf] = 0;
        if(!strcmp(buf, "exit")){
            printf("exit_server\n");
            close(connfd);
            break;
        printf("new conn(%s:%d); msg: %s\n", inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port), buf);
        send(connfd, buf, nbuf, 0);
        close(connfd);
    close(listenfd);
    return 0;

           
                                    #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#define SERV_PORT 8080
#define BUF_SIZE 128
int main(int argc, char *argv[]){
    if(argc < 2){
        fprintf(stderr, "usage: %s <MSG>\n", argv[0]);
        exit(EXIT_FAILURE);
    int sockfd;
    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
        perror("create_sockfd error");
        exit(EXIT_FAILURE);
    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    if(inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr) <= 0){
        perror("convert_servaddr error");
        exit(EXIT_FAILURE);
    servaddr.sin_port = htons(SERV_PORT);
    if(connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0){
        perror("connect_sockfd error");
        exit(EXIT_FAILURE);
    char buf[BUF_SIZE];
    int nbuf = strlen(argv[1]);
    send(sockfd, argv[1], nbuf, 0);
    nbuf = recv(sockfd, buf, BUF_SIZE, 0);
    buf[nbuf] = 0;
    printf("echo msg: %s\n", buf);
    close(sockfd);
    return 0;

           
                                      $ gcc -o server tcp_echo_server.c
$ gcc -o client tcp_echo_client.c
$ ./server
$ for ((i=0; i<10; i++)); do ./client 'www.zfl9.com'; done && ./client 'exit'
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg:
$ ./server
new conn(127.0.0.1:55806); msg: www.zfl9.com
new conn(127.0.0.1:55808); msg: www.zfl9.com
new conn(127.0.0.1:55810); msg: www.zfl9.com
new conn(127.0.0.1:55812); msg: www.zfl9.com
new conn(127.0.0.1:55814); msg: www.zfl9.com
new conn(127.0.0.1:55816); msg: www.zfl9.com
new conn(127.0.0.1:55818); msg: www.zfl9.com
new conn(127.0.0.1:55820);

 msg: www.zfl9.com
new conn(127.0.0.1:55822); msg: www.zfl9.com
new conn(127.0.0.1:55824); msg: www.zfl9.com
exit_server

           
                                      #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#define BIND_PORT 8080
#define BUF_SIZE 128
int main(void){
    int sockfd;
    if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0){
        perror("create_sockfd error");
        exit(EXIT_FAILURE);
    struct sockaddr_in bindaddr;
    memset(&bindaddr, 0, sizeof(bindaddr));
    bindaddr.sin_family = AF_INET;
    bindaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    bindaddr.sin_port = htons(BIND_PORT);
    if(bind(sockfd, (struct sockaddr *)&bindaddr, sizeof(bindaddr)) < 0){
        perror("bind_sockfd error");
        exit(EXIT_FAILURE);
    struct sockaddr_in peeraddr;
    socklen_t peerlen = sizeof(peeraddr);
    char buf[BUF_SIZE];
    int nbuf;
    for(;;){
        nbuf = recvfrom(sockfd, buf, BUF_SIZE, 0, (struct sockaddr *)&peeraddr, &peerlen);
        buf[nbuf] = 0;
        if(!strcmp(buf, "exit")){
            printf("exit_server\n");
            break;
        printf("new msg(%s:%d): %s\n", inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port), buf);
        sendto(sockfd, buf, nbuf, 0, (struct sockaddr *)&peeraddr, peerlen);
    close(sockfd);
    return 0;

           
                                      #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#define SERV_PORT 8080
#define BUF_SIZE 128
int main(int argc, char *argv[]){
    if(argc < 2){
        fprintf(stderr, "usage: %s <MSG>\n", argv[0]);
        exit(EXIT_FAILURE);
    int sockfd;
    if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0){
        perror("create_sockfd error");
        exit(EXIT_FAILURE);
    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    if(inet_pton(AF_INET, "127.0.0.1", &servaddr.sin_addr) <= 0){
        perror("convert_servaddr error");
        exit(EXIT_FAILURE);
    servaddr.sin_port = htons(SERV_PORT);
    char buf[BUF_SIZE];
    int nbuf = strlen(argv[1]);
    sendto(sockfd, argv[1], nbuf, 0, (struct sockaddr *)&servaddr, sizeof(servaddr));
    nbuf = recvfrom(sockfd, buf, BUF_SIZE, 0, NULL, NULL);
    buf[nbuf] = 0;
    printf("echo msg: %s\n", buf);
    close(sockfd);
    return 0;

           
                                      $ gcc -o server udp_echo_server.c
$ gcc -o client udp_echo_client.c
$ ./server
$ ./client 'test'
$ for ((i=0; i<10; i++)); do ./client 'www.zfl9.com'; done && ./client 'exit'
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
echo msg: www.zfl9.com
$ ./server
new msg(127.0.0.1:45884): test
new msg(127.0.0.1:47339): www.zfl9.com
new msg(127.0.0.1:49160): www.zfl9.com
new msg(127.0.0.1:34802): www.zfl9.com
new msg(127.0.0.1:45306): www.zfl9.com
new msg(127.0.0.1:59937): www.zfl9.com
new msg(127.0.0.1:53763): www.zfl9.com

socket

socket API

socket

bind

listen

connect

accept

recv

send (adsbygoogle = window.adsbygoogle || []).push({});

recvfrom

sendto

shutdown

close (adsbygoogle = window.adsbygoogle || []).push({});

shutdown和close区别

tcp握手与挥手

tcp_socket实例

udp_socket实例