Re: [PATCH v4 0/5] fix wrong program abort on __FD_ELT

[KOSAKI Motohiro <kosaki dot motohiro at gmail dot com>]

On Tue, Apr 30, 2013 at 11:08 PM, Carlos O'Donell <carlos@redhat.com> wrote:
> On 04/13/2013 08:47 PM, KOSAKI Motohiro wrote:
>> Changes from v3 to v4
>>  - remove _STRICT_FD_SIZE_CHECK ifdef.
>>  - instead, always check buffersize. requested from Florian Weimer.
>
> Do we want to update manual/llio.texi to describe those macros
> that can work with heap allocated fd sets?
>
> These macros are being clearly used in Linux and BSD to operate
> on heap allocated sets, and the glibc versions of some of these
> macros do support those uses.

The manual already explains this case. I guess GNU/Hurd also support
the same extension.


@comment sys/types.h
@comment BSD
@deftypevr Macro int FD_SETSIZE
The value of this macro is the maximum number of file descriptors that a
@code{fd_set} object can hold information about.  On systems with a
fixed maximum number, @code{FD_SETSIZE} is at least that number.  On
some systems, including GNU, there is no absolute limit on the number of
descriptors open, but this macro still has a constant value which
controls the number of bits in an @code{fd_set}; if you get a file
descriptor with a value as high as @code{FD_SETSIZE}, you cannot put
that descriptor into an @code{fd_set}.
@end deftypevr