Re: How to increat [sic.] max open files - some answers
Miquel van Smoorenburg (miquels@drinkel.cistron.nl)
6 Jan 1997 18:16:35 +0100
In article <Pine.LNX.3.95.970105200741.283A-100000@nextd.demon.co.uk>,
Mark Hemment <markhe@nextd.demon.co.uk> wrote:
>
>On 4 Jan 1997, Miquel van Smoorenburg wrote:
>> posix_types.h:#undef __FD_SETSIZE
>> posix_types.h:#define __FD_SETSIZE 1024
>> posix_types.h:#define __FDSET_LONGS (__FD_SETSIZE/__NFDBITS)
>> time.h:#define FD_SETSIZE __FD_SETSIZE
>
>But what happens when 1024 is not enough, or 2048...
>
>Under an SVR4 derived system, when the num of open descriptors is raised
>FD_SETSIZE does not magically change in the library/apps.
No, but as I said, on some systems you can just do a
#define FD_SETSIZE 4096
#include <sys/select.h>
and presto sizeof(fd_set) == 512 (4096 bits)
Just be careful not to hand file descriptors > 1024 to a library
function that uses select().
Mike.
--
| Miquel van Smoorenburg | "Sticky tape is like the Force - it has a |
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