Function is_blocking

src/butil/fd_utility.cpp:34–37

namespace butil {

bool is_blocking(int fd) {
    const int flags = fcntl(fd, F_GETFL, 0);
    return flags >= 0 && !(flags & O_NONBLOCK);
}

int make_non_blocking(int fd) {
    const int flags = fcntl(fd, F_GETFL, 0);