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/*
* Copyright (C) 1996-2025 The Squid Software Foundation and contributors
*
* Squid software is distributed under GPLv2+ license and includes
* contributions from numerous individuals and organizations.
* Please see the COPYING and CONTRIBUTORS files for details.
*/
#ifndef SQUID_COMPAT_FDSETSIZE_H
#define SQUID_COMPAT_FDSETSIZE_H
/****************************************************************************
*--------------------------------------------------------------------------*
* DO *NOT* MAKE ANY CHANGES below here unless you know what you're doing...*
*--------------------------------------------------------------------------*
****************************************************************************/
/*
* On some systems, FD_SETSIZE is set to something lower than the
* actual number of files which can be opened. IRIX is one case,
* NetBSD is another. So here we increase FD_SETSIZE to our
* configure-discovered maximum *before* any system includes.
*/
#define CHANGE_FD_SETSIZE 1
/*
* Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
* with glibc 2.2 (or later? remains to be seen). We do this by including
* bits/types.h which defines __FD_SETSIZE first, then we redefine
* __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
* directly, so this is a dirty hack!
*/
#if _SQUID_LINUX_ || _SQUID_KFREEBSD_
#undef CHANGE_FD_SETSIZE
#define CHANGE_FD_SETSIZE 0
#include <features.h>
#if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
#if SQUID_MAXFD > DEFAULT_FD_SETSIZE
#include <bits/types.h>
#if HAVE_LINUX_POSIX_TYPES_H
#include <linux/posix_types.h>
#endif
#undef __FD_SETSIZE
#define __FD_SETSIZE SQUID_MAXFD
#endif
#endif
#endif
/*
* Cannot increase FD_SETSIZE on FreeBSD before 2.2.0, causes select(2)
* to return EINVAL.
* --Marian Durkovic <marian@svf.stuba.sk>
* --Peter Wemm <peter@spinner.DIALix.COM>
*/
#if _SQUID_FREEBSD_
#include <osreldate.h>
#if __FreeBSD_version < 220000
#undef CHANGE_FD_SETSIZE
#define CHANGE_FD_SETSIZE 0
#endif
#endif
/*
* Trying to redefine CHANGE_FD_SETSIZE causes a slew of warnings
* on Mac OS X Server.
*/
#if _SQUID_APPLE_
#undef CHANGE_FD_SETSIZE
#define CHANGE_FD_SETSIZE 0
#endif
/* Increase FD_SETSIZE if SQUID_MAXFD is bigger */
#if CHANGE_FD_SETSIZE && SQUID_MAXFD > DEFAULT_FD_SETSIZE
#define FD_SETSIZE SQUID_MAXFD
#endif
/*
* Trap unintentional use of fd_set. Must not be used outside the
* select code as it only supports FD_SETSIZE number of filedescriptors
* and Squid may be running with a lot more..
* But only for code linked into Squid, not the helpers.. (unlinkd, pinger)
*/
#ifdef SQUID_FDSET_NOUSE
# ifndef SQUID_HELPER
# define fd_set ERROR_FD_SET_USED
# endif
#endif
#endif /* SQUID_COMPAT_FDSETSIZE_H */
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