Function wait_ready

src/ui/httpd.c:94–119

Wait until the socket is readable/writable. 1 = ready, 0 = timeout, -1 = error. * Windows uses select() deliberately (WSAPoll has a Won't-Fix bug where * certain socket errors are never reported, which can stall an event loop). */

 * Windows uses select() deliberately (WSAPoll has a Won't-Fix bug where
 * certain socket errors are never reported, which can stall an event loop). */
static int wait_ready(cbm_sock_t fd, bool writing, int timeout_ms) {
#ifdef _WIN32
    fd_set ready;
    fd_set errors;
    FD_ZERO(&ready);
    FD_ZERO(&errors);
    FD_SET(fd, &ready);
    FD_SET(fd, &errors);
    struct timeval tv;
    tv.tv_sec = timeout_ms / 1000;
    tv.tv_usec = (timeout_ms % 1000) * 1000;
    int rc = select(0, writing ? NULL : &ready, writing ? &ready : NULL, &errors, &tv);
    if (rc <= 0)
        return rc < 0 ? -1 : 0;
    return FD_ISSET(fd, &errors) ? -1 : 1;
#else
    struct pollfd pfd;
    pfd.fd = fd;
    pfd.events = writing ? POLLOUT : POLLIN;
    pfd.revents = 0;
    int rc = poll(&pfd, 1, timeout_ms);
    if (rc < 0)
        return errno == EINTR ? 0 : -1;
    return rc > 0 ? 1 : 0;
#endif
}

static int wait_readable(cbm_sock_t fd, int timeout_ms) {
    return wait_ready(fd, false, timeout_ms);