Typo in <sys/select.h>?
Wed Jul 6 14:01:23 GMT 2022
On 06/07/2022 08:42, Corinna Vinschen wrote:
> On Jul 5 17:51, Ken Brown wrote:
>> On 7/5/2022 10:13 AM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via Cygwin wrote:
> I guess we can change FD_SETSIZE to 1024 as on Linux, albeit this has no
> real meaning on Cygwin. On Linux, select(2) is really only capable to
> handle file descriptors numbers up to descriptor number 1023, but Cygwin
> doesn't have this problem. FD_SETSIZE == 64 was only something to save
> space. The bigger FD_SETSIZE, the bigger are the default fd_sets,
> something you don't want on small targets.
> So, yeah, something like
> #ifndef FD_SETSIZE
> # ifdef __CYGWIN__
> # define FD_SETSIZE 1024
> # else
> # define FD_SETSIZE 64
> # endif
Remember that 64 is MAXIMUM_WAIT_OBJECTS for WaitForMultipleObjects(),
the underlying Win32 API used to implement select(), so using more than
64 hits some complex code to work around that...
More information about the Cygwin