socket::accept continual to return EGAIN

Question

I use nonblocking socket to receive new connection. But the code repeatedly fails to accept(). int sockfd = ::socket(family, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, IPPROTO_TCP); ::bind(sockfd, bind_addr, static_cast(sizeof(struct sockaddr_in6))); ret = ::listen(sockfd, SOMAXCONN); while (True) { ::poll(&*pollfds_.begin(), pollfds_.size(), timeoutMs); struct sockaddr_in6 addr; bzero(&addr, sizeof addr); socklen_t addrlen = static_cast(sizeof *addr); int connfd = ::accept4(sockfd, sockaddr_cast(addr), &addrlen, SOCK_NONBLOCK | SOCK_CLOEXEC); } errno is EAGAIN. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

From the manpage to accept(2): EAGAIN or EWOULDBLOCK The socket is marked nonblocking and no connections are present to be accepted. POSIX.1-2001 allows either error to be returned for this case, and does not require these constants to have the same value, so a portable application should check for both possibilities. This means that the call to accept is made before the client has connected.