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fd_set beyond 1024 problem

From: Daniel Stenberg <>
Date: Wed, 30 May 2007 09:35:31 +0200 (CEST)


I've realized that we use fd_set internally, even when we use poll() (in the
select()-"simulating" function).

If we raise the maximum number of filedescriptors above 1024 and use more than
1024 in a libcurl-using application, the FD_SET(), FD_CLEAR() etc macros (and
even the select() function) write beyond the boundary of the fd_set variable
and all sorts of funny things happen.

It isn't clear to me what the portable way of raising this limit is for
fd_set, but I feel a strong urge to fix this issue.

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Received on 2007-05-30