[Qemu-devel] Re: [PATCH v5 3/6] char: Let writers know how much data was written in case of errors

[Gerd Hoffmann]

> @@ -531,8 +534,12 @@ static int unix_write(int fd, const uint8_t *buf, int len1)
>       while (len>  0) {
>           ret = write(fd, buf, len);
>           if (ret<  0) {
> -            if (errno != EINTR&&  errno != EAGAIN)
> +            if (len1 - len) {
> +                return len1 - len;
> +            }
> +            if (errno != EINTR&&  errno != EAGAIN) {
>                   return -1;
> +            }

This makes unix_write pass -EINTR up to the caller which it didn't before.

cheers,
  Gerd