Read system call taking forever on Linux

Question

I'm writing a TCP server application in c++.

I'm trying to read a line one char at a time from a socket, but the read() system call never returns.

string buffered_reader::read_line() {
    string str;
    int i = 0;
    char ch;

    do {
        int len = conn.read_from_conn((void*)&ch, 1);
        if (len == -1)
            throw string("Error reading from connection!");

        str += ch;
    } while (ch != '\n');

    return str;
}

And here is the read_from_conn() function

int connectionplusplus::read_from_conn(void *buffer, int buffer_len) {
   return read(this->connfd, buffer, buffer_len);
}

Answer 1

问题是connfd尚未初始化。