C聊天程序得到错误分段错误(核心转储)

Question

我正在用C语言在客户端和服务器之间构建一个聊天程序.客户端将连接到服务器,向其发送消息.然后服务器将响应该meesage.

如果有另一个客户端连接到服务器,则新连接将创建一个新线程.所以我使用pthread.h在C中构建一个多线程聊天程序.请参阅下面的server.c和client.c代码以获取更多详细信息.

server.c

#include <pthread.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 7778

void error(char *msg){
    perror(msg);
    exit(1);
}

void *clientHandler(void*);

int main(){
    printf("INFO enter the main()\n");
    int sockfd, newsockfd, clilen;
    char buffer[256];
    struct sockaddr_in serv_addr, cli_addr;
    int n, threadID;
    pthread_t interrupt;

    printf("INFO before calling socket()\n");
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
        printf("INFO after calling socket()\n");
    if(sockfd < 0)
        error("ERROR opening socket\n");

    printf("INFO before calling bzero()\n");
    bzero((char*) &serv_addr, sizeof(serv_addr));
    printf("INFO after calling socket()\n");

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = INADDR_ANY;
    serv_addr.sin_port = htons(PORT);
    printf("INFO after assigning Internet info\n");

    if(bind(sockfd, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) < 0)    
    {
        error("ERROR on binding\n");
        return 0;
    }
    printf("INFO before calling listen()\n");

    listen(sockfd, 5);

    printf("INFO before entering While(1)\n");
    while(1)
    {
        int re;
        clilen = sizeof(cli_addr);
        printf("INFO before calling accept()\n");
        newsockfd = accept(sockfd, (struct sockaddr*)&cli_addr, &clilen);

        if(newsockfd < 0){
            error("ERROR on accepting\n");
            return 0;
        }
        printf("INFO before calling pthread_create()\n");
        re = pthread_create(&interrupt, NULL, clientHandler, NULL);
        if(re){
            printf("ERROR return code from the pthread_create() is %d\n", re);
        }       
    }
    printf("INFO before calling pthread_exit(NULL)\n");
    pthread_exit(NULL);
    return 0;
}

void *clientHandler(void *param){
    int n, newsockfd;
    newsockfd = *((int*)param);
    char buffer[256];
    bzero(buffer, 256);

    while(1){
        n = read(newsockfd, buffer, 255);

        if(n < 0){
            error("ERROR reading from socket\n");
            pthread_exit(NULL);
        }

        printf("Server received the message: %s", buffer);

        n = write(newsockfd, "Server got it\n", 18);

        if(n < 0){
            error("ERROR writing to socket\n");
            pthread_exit(NULL);
        }
    }
}

client.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

#define PORT 7778
#define HOSTNAME "127.0.0.1"

void error(char*msg){
    perror(msg);
    exit(1);
}

int main(){
    int sockfd, n;
    struct sockaddr_in serv_addr;
    struct hostent* server;
    //char *hostname = "127.0.0.1";

    char buffer[256];

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    if(sockfd < 0)
        error("ERROR opening socket\n");

    server = gethostbyname(HOSTNAME);
    if(server == NULL){
        fprintf(stderr,"ERROR no such host\n");
        exit(0);
    }

    bzero((char*) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;

    bcopy((char*)server->h_addr, (char*)&serv_addr.sin_addr.s_addr, server->h_length);

    serv_addr.sin_port = htons(PORT);

    if(connect(sockfd, &serv_addr, sizeof(serv_addr)) < 0){
        error("ERROR connecting\n");
        return 0;
    }

    while(1)
    {    
        printf("Please enter the message: ");
        bzero(buffer, 256);
        fgets(buffer, 255, stdin);
        n=write(sockfd, buffer, strlen(buffer));

        if(n < 0){
            error("ERROR reading from socket\n");
            return 0;    
        }

        printf("[Server got it] %s\n", buffer);
    }

    return 0;
}

好的,我使用终端在Linux环境下成功构建了*.c文件.

我用这个命令行来构建server.c

gcc server.c -o server.out -pthread

并使用这个来构建client.c

gcc client.c -o client.out

然后,我调用server.out来运行服务器:

 ./server.out

并运行client.out

./client.out 

但是,在我运行server.out时,我得到了错误:

Segmentation fault (core dumped)

伙计们,你能和我分享一下你的经历吗？我的代码在某处错了吗？

Answer 1

该行传递NULL作为处理程序的参数

 re = pthread_create(&interrupt, NULL, clientHandler, NULL);

它应该是:

 re = pthread_create(&interrupt, NULL, clientHandler, &newsockfd);

正如Sourav Ghosh评论的那样.