Date: Sat, 14 Oct 1995 21:26:16 +0100 From: volf@oasis.IAEhv.nl (Frank Volf) To: FreeBSD-gnats-submit@freebsd.org Subject: kern/781: MAX_OPEN and FD_SETSIZE Message-ID: <199510142026.VAA01503@oasis> Resent-Message-ID: <199510142030.NAA16913@freefall.freebsd.org>
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>Number: 781
>Category: kern
>Synopsis: OPEN_MAX in kernel config and FD_SETSIZE in /usr/include/sys/types.h mismatch
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Oct 14 13:30:01 PDT 1995
>Last-Modified:
>Originator: Frank Volf
>Organization:
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>Release: FreeBSD 2.0-BUILT-19950603 i386
>Environment:
FreeBSD 2.0.5 from CD, nothing fancy in the kernel config
>Description:
The OPEN_MAX define in the kernel configuration can be used to have
a large number of open file descriptors (e.g. 512),
getdtablesize returns the value set by OPEN_MAX (this is ok),
FD_SETSIZE in /usr/include/sys/types.h is defined as 256.
sys_generic.c (containing the code for select()) is compiled with
this FD_SETSIZE set to 256.
The select() fails at runtime if it is called with a nfds > FD_SETSIZE,
because it is compiled with the FD_SETSIZE value, and does not
know about OPEN_MAX > 256
>How-To-Repeat:
See above.
>Fix:
Preferable automatic generation of the types.h file from kernel
configuration by /usr/sbin/config.
Please, let me know the status of this bug report (maybe I did something
wrong).
Frank
>Audit-Trail:
>Unformatted:
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