Memset 似乎冻结了我的程序 C++ 和我没有看到的其他问题

Question

我一直在制作这个服务器，我正在使用 memset() 来清除 struct addrinfo。

#include <iostream>
#include <string>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <ncurses.h>
#include <vector>

#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#define MAX_CONNECTIONS 10
#define MAX_SRSIZE 500

using namespace std;

struct bcpackage{
    string * message;
};
struct clientval{
    int fd;
};

vector<int> file_descriptors;
WINDOW * console, * input;

void * handleClient(void * arg);
void * broadcast(void * arg);

int main(int argc, char **argv)
{
    int myfd, * status;
    status = new int();
    struct addrinfo myaddrinfo, *res;

    /****************SETUP NCURSES UI******************/
    initscr();
    int y, x;
    getmaxyx(stdscr, y, x);
    console = subwin(stdscr,y - 1, x, 0, 0);
    input = subwin(stdscr,1,x,y-1,0);
    wrefresh(console);
    wprintw(input,">");
    /**************************************************/
    string port = "25544";
    wprintw(console,"port: %s\n", port.c_str());
    memset(&myaddrinfo, 0, sizeof(myaddrinfo));//Problem I think with this memset()
    myaddrinfo.ai_family = AF_UNSPEC;
    myaddrinfo.ai_socktype = SOCK_STREAM;
    myaddrinfo.ai_flags = AI_PASSIVE;
    wprintw(console,"Starting Server\n");
    int aistat = getaddrinfo(NULL, "25544", &myaddrinfo, &res);
    if( aistat == 0){
        wprintw(console,"Host Information Retrieved\n");
    }
    else{
        wprintw(console, "Error : %d\n%s\n", aistat, gai_strerror(aistat));
        getch();
        endwin();
        exit(1);
    }   //We now have our address now we create a socket
    myfd = socket(res->ai_family, res->ai_socktype,res->ai_protocol);
    if(myfd==-1){
        wprintw(console, "Socket Creation Failed\n");
        wprintw(console,"Error: %d\n%s\n", errno, strerror(errno));
        getch();
        endwin();
        exit(2);
    }
    //If all went well, we now have a socket for our server
    //we will now use the bind() function to bind our socket
    //to our program. I think that is what it does at least.
    *status = bind(myfd, res->ai_addr, res->ai_addrlen);
    //wprintw(console, "Status: %d\n", *status);
    if((*status) < 0){
        wprintw(console, "Bind failed\n");
        wprintw(console,"Error: %d\n%s\n", errno, strerror(errno));
        getch();
        endwin();
        exit(3);
    }
    else{
        wprintw(console, "Bind success\n");
    }
    //Now that we are bound, we need to listen on the socket
    *status = listen(myfd, MAX_CONNECTIONS);
    if(status>=0){
        wprintw(console, "Listening on socket\n");
    }
    else{
        wprintw(console, "Listen failed\n");
        wprintw(console,"Error: %d\n%s\n", errno, strerror(errno));
        getch();
        endwin();
        exit(4);
    }

    //Everything is setup now we send the server into a loop that will pass
    //each client to a new pthread.
    while(true){
        int *clientfd = new int();
        pthread_t * cliPID = new pthread_t();
        struct sockaddr_in * cliaddr = new struct sockaddr_in();
        socklen_t *clilen = new socklen_t();
        *clilen = sizeof(*cliaddr);
        *clientfd = accept(myfd, (struct sockaddr *)cliaddr, clilen);
        file_descriptors.push_back(*clientfd);
        pthread_create(cliPID, NULL, handleClient, clientfd);
    }
    getch();
    endwin();
    return 0;
}

void * handleClient(void * arg){//Reads and writes to the functions
    int filedesc = *((int *)arg);
    string * rcvmsg = new string();
    while(!read(filedesc, rcvmsg, MAX_SRSIZE)<=0){
        if(rcvmsg->compare("")!=0){
            wprintw(console, "Client> %s\n", rcvmsg->c_str());
            broadcast(rcvmsg);
        }
        rcvmsg->clear();
    }
    delete rcvmsg;
    pthread_exit(NULL);
}

void * broadcast(void * arg){
    string * message = (string *)arg;
    int num_fds = file_descriptors.size(); 
    for(int i = 0; i < num_fds; i++ ){
        write(file_descriptors.at(i), message, MAX_SRSIZE);
    }

}

注意，这是为linux编写的，编译时需要添加这些链接器命令，-lpthread -lncurses。 最大的问题是当我有 memset() 行时，程序甚至不会在该行之前运行任何东西。它只是坐在那里。当我注释掉那条线时，它实际上会运行。 另一个错误是，当我确实取出 memset() 行时，当我使用 gai_strerror() 时，getaddrinfo() 会给出 ai_socktype not supported 错误用 getaddrinfo() 查找错误。 请帮助我。我真的被卡住了，我看不出有什么问题。

提前致谢。

Answer 1

它运行得很好。发生的情况是，当程序退出时，您的 ncurses 窗口正在被销毁，并且所有数据都消失了。

在return 0 之前添加一个getch()，它会神奇地工作。