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sendmsg: Invalid argument

Last updated at Posted at 2021-08-08

概要

UDPでsendmsgをしようとした際に以下のエラーが出力されたのでその対応メモ

sendmsg: Invalid argument

詳細

以下はエラーが発生した際のsendmsgする関数の一部抜粋です。

void sender(struct addrinfo *res_local, struct addrinfo *res_remote, unsigned int usecs) {

    int sock;
    unsigned char buf[BUF_LEN] = {"0"};
    unsigned char buf2[BUF_LEN] = {"0"};

    sock = socket(res_remote->ai_family, res_remote->ai_socktype, res_remote->ai_protocol);
    
    struct iovec iov[2];
    iov[0].iov_base = (void*) buf;
    iov[0].iov_len = sizeof(buf);
    iov[1].iov_base = (void*) buf2;
    iov[1].iov_len = sizeof(buf2);

    struct msghdr msg;

    msg.msg_name = (void *) res_remote->ai_addr;
    msg.msg_namelen = res_remote->ai_addrlen;
    
    msg.msg_iov = iov;
    msg.msg_iovlen = 2;
    
    while (1) {
        errno = 0;
        int k = sendmsg(sock, &msg, 0); 
        if (k < 1) {
            if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {
                perror("sendmsg EAGAIN?");
            } else {
                perror("sendmsg");
                return;
            }   
        }   
        fprintf(stderr,".");
        usleep(usecs);
    }   

    close(sock);

}

msghdr構造体を宣言時に初期化をすれば、「Invalid argument」が出なくなったことを確認しました。

struct msghdr msg = {};
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