[Ffmpeg-devel] poll() emulation for ffserver

[matthieu castet]

Hi,

Fran?ois Revol wrote:

> +
> +    FD_ZERO(&read_set);
> +    FD_ZERO(&write_set);
> +    FD_ZERO(&exception_set);
> +
> +    n = -1;
> +    for(i = 0; i < numfds; i++) {
> +        if (fds[i].fd < 0)
> +            continue;
> +
> +        if (fds[i].events & POLLIN)  FD_SET(fds[i].fd, &read_set);
> +        if (fds[i].events & POLLOUT) FD_SET(fds[i].fd, &write_set);
> +        if (fds[i].events & POLLERR) FD_SET(fds[i].fd, &exception_set);
You you check if numfds >= FD_SETSIZE :

man select
[...]
An fd_set is a fixed size buffer.  Executing FD_CLR() or FD_SET()  with
a value of fd that is negative or is equal to or larger than FD_SETSIZE
will result in undefined behavior. Moreover, POSIX requires fd to be  a
valid file descriptor.


Matthieu