[Linux] 最简单的socket通讯例子

这个代码很简单，用途有两个：

1，刚入门的新同学可以参考。

2，想随手写个测试程序的同学可以拷贝。

server:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <endian.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <netinet/in.h>
int main(int argc, char** argv)
{
    if (argc != 2)
    {
        printf("Usage:/n  %s port/n", argv[0]);
        return 0;
    }
    
    int port = atoi(argv[1]);
    
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = 0;
    int on = 1;
    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
    if (bind(sock, (struct sockaddr *) &addr, sizeof(addr)) < 0)
    {
        perror("bind");
        return 0;
    }
    if (listen(sock, 50) < 0)
    {
        perror("listen");
        return 0;
    }
    printf("start listening .../nPress Ctrl+C to quit/n/n");
    int count = 0;
    while (1)
    {
        accept(sock, 0, 0);
        count++;
        if (count%100 == 0)
        {
            printf("accepted: %d/n", count);
        }
    }
    
    return 0;
}

client:

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <endian.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <netinet/in.h>
int main(int argc, char** argv)
{
    if (argc != 3)
    {
        printf("Usage:/n  %s ip port/n", argv[0]);
        return 0;
    }
    char* ip = argv[1];    
    int port = atoi(argv[2]);
    
    sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = inet_addr(ip);

    printf("client running .../nPress Ctrl+C to quit/n/n");
    int count = 0;
    while (1)
    {
        int sock = socket(AF_INET, SOCK_STREAM, 0);
        
        if (connect(sock, (sockaddr*)&addr, sizeof(addr)) < 0)
        {
            perror("connect");
            return 0;
        }
        close(sock);
        
        //usleep(10*1000);
        
        count++;
        if (count%100 == 0)
        {
            printf("connected: %d/n", count);
        }
    }
    
    return 0;
}