socket应用

最新推荐文章于 2023-05-19 00:05:18 发布

zzobin

最新推荐文章于 2023-05-19 00:05:18 发布

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分类专栏： Java Android 文章标签： socket path android struct unix system

本文链接：https://blog.youkuaiyun.com/zzobin/article/details/7931025

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这篇博客深入探讨了Unix系统下的Socket应用，涵盖了socket的基础概念、在Android环境中的使用，以及涉及的struct和path管理技巧。

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scoket应用

#include <sys/stat.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <cutils/sockets.h>
#include <private/android_filesystem_config.h>

int create_socket(const char *name, int type, mode_t perm, uid_t uid, gid_t gid)
{
    struct sockaddr_un addr;
    int fd, ret;

    fd = socket(PF_UNIX, type, 0);
    if (fd < 0) {
        printf("Failed to open socket '%s': %s\n", name, strerror(errno));
        return -1;
    }

    memset(&addr, 0 , sizeof(addr));
    addr.sun_family = AF_UNIX;
    snprintf(addr.sun_path, sizeof(addr.sun_path), ANDROID_SOCKET_DIR"/%s",
             name);

    ret = unlink(addr.sun_path);
    if (ret != 0 && errno != ENOENT) {
        printf("Failed to unlink old socket '%s': %s\n", name, strerror(errno));
        goto out_close;
    }

    ret = bind(fd, (struct sockaddr *) &addr, sizeof (addr));
    if (ret) {
        printf("Failed to bind socket '%s': %s\n", name, strerror(errno));
        goto out_unlink;
    }

    chown(addr.sun_path, uid, gid);
    chmod(addr.sun_path, perm);

    printf("Created socket '%s' with mode '%o', user '%d', group '%d'\n",
         addr.sun_path, perm, uid, gid);

    return fd;

out_unlink:
    unlink(addr.sun_path);
out_close:
    close(fd);
    return -1;
}

///////////////////////////////////////////////////
#if 1
#define LOG_TAG "AT"
#define LOGE(...) fprintf(stderr, "I:" __VA_ARGS__)
#define SOCKET_NAME "test"

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/un.h>
#include <cutils/sockets.h>
//#include <cutils/log.h>
#include <fcntl.h>    //open(), read(), write()
//#include <utils/log.h>
#define BUFSIZE 100
//#include <android/log.h>

//#define LOGD(...) __android_log_print(ANDROID_LOG_ERROR, "myserver", __VA_ARGS__)

int main(){

#if 1
    int connect_number = 4;
    int fdListen = -1, new_fd = -1;
    int fd, ret;
    char buf[BUFSIZE];

    /*char *msg = "";// "ttyGS0 test";
    fd = open("/dev/ttyGS0", O_RDWR);
    printf("envi serial test program\n");
    if(fd < 0)
    {
        printf("Error: open /dev/ttyGS0 error!\n");
        return 1;
    }*/
    /*ret = write(fd, msg, strlen(msg));
    if(ret < 0)
    {
        printf("Error: write msg error!\n");
        return 1;
    }*/
    /*while(buf[0] == NULL){

        memset(buf, 0, sizeof(buf));
        ret = read(fd, buf, BUFSIZE);

        if(ret < 0)
        {
             printf("Error: read device error!\n");
             return 1;
        }

        if(buf[0] != '\0')
        {
            ;//printf("%s\n", buf);
        }
    }*/
    //struct sockaddr_un peeraddr;
    struct sockaddr peeraddr;
    socklen_t socklen = sizeof (peeraddr);
    int numbytes ;
    char buff[256];

    fdListen = create_socket(SOCKET_NAME,SOCK_STREAM,0666,AID_SYSTEM,AID_SYSTEM);//android_get_control_socket(SOCKET_NAME);
    if (fdListen < 0) {
        LOGE("Failed to get socket '" SOCKET_NAME "' errno:%d", errno);
        perror("android_get_control_socket");
        printf("error:%s\n",strerror(errno));
        exit(-1);
    }
    while(1){
    ret = listen(fdListen, connect_number);
    if (ret < 0) {
        perror("listen");
        exit(-1);
    }
    //It block until client connected.accept(socket_id, &peeraddr, &socklen);
    #if 1
    new_fd = accept(fdListen, &peeraddr, &socklen);
    if (new_fd < 0 ) {
        LOGE("Error on accept() errno:%d", errno);
        perror("accept");
        //exit(-1);
    }
    //send at command from ttyGS0

    //while(send(new_fd,"AT+MMAT", 7, 0) > 0);
     if(send(new_fd, "AT+MMAT", 7, 0) < 0){
   LOGE("send()");
     }

    //read from app device testing result
    if((numbytes = recv(new_fd,buff,sizeof(buff),0))==-1)
    {
        LOGE("recv");
        perror("recv");
        exit(-1);
    }
    printf("%s",buff);
    //
    if(send(new_fd,buff,strlen(buff),0)==-1)
    {
   LOGE("send_");
        perror("send");
        close(new_fd);
        exit(0);
    }
    //ret = write(fd, buff, strlen(buff));
    //if(ret < 0)
    //{
    //   printf("Error: write msg error!\n");
    //   return 1;
    //}
    #endif
   }
   // close(fd);
    close(new_fd);
    close(fdListen);
    #endif
    return 0;
}
#endif