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经过多次尝试，我无法得到我的select()工作。我迷路了！结果我开始-1了。我正在遵循本指南。

listen(sock, MAXQUEUE);
build_select_list(sock, connectlist, highsock, socks);

readsocks = select(FD_SETSIZE, &socks, (fd_set *) 0, (fd_set *) 0,
        NULL );

这些是我正在使用的功能：

void build_select_list(int sock, int connectlist[], int highsock, fd_set socks) {
int listnum;

FD_ZERO(&socks);

FD_SET(sock, &socks);

/* Loops through all the possible connections and adds
 those sockets to the fd_set */

for (listnum = 0; listnum < MAXQUEUE; listnum++) {
    if (connectlist[listnum] != 0) {
        FD_SET(connectlist[listnum], &socks);
        if (connectlist[listnum] > highsock)
            highsock = connectlist[listnum];
    }
}}

这就是我获取侦听器文件描述符的方式：

int socketServer(char* portNumber) {

    int sockfd; // listen on sock_fd, new connection on new_fd
    struct addrinfo hints, *servinfo, *p;
    struct sigaction sa;
    int yes = 1;
    int rv;
    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_flags = AI_PASSIVE; // use my IP
    if ((rv = getaddrinfo(NULL, portNumber, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }
    // loop through all the results and bind to the first we can
    for (p = servinfo; p != NULL ; p = p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol))
                == -1) {
            perror("server: socket");
            continue;
        }
        if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int))
                == -1) {
            perror("setsockopt");
            exit(1);
        }
        if (bind(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("server: bind");
            continue;
        }
        break;
    }
    if (p == NULL ) {
        fprintf(stderr, "server: failed to bind\n");
        return 2;
    }
    freeaddrinfo(servinfo); // all done with this structure
    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen");
        exit(1);
    }
    sa.sa_handler = sigchld_handler; // reap all dead processes
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESTART;
    if (sigaction(SIGCHLD, &sa, NULL ) == -1) {
        perror("sigaction");
        exit(1);
    }
    return sockfd;

}

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1 回答 1

2

Your build_select_list function takes a copy of the set, and modifies only that local copy. Pass it "by reference", just like you do to the select function.

And of course you have to call this function every time you before you call select, as the select function modifies the set.

于 2013-06-30T06:59:12.757 回答