compat/fdsetsize.h

   1 /*
   2  * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef SQUID_COMPAT_FDSETSIZE_H
  10 #define SQUID_COMPAT_FDSETSIZE_H
  11
  12 /****************************************************************************
  13  *--------------------------------------------------------------------------*
  14  * DO *NOT* MAKE ANY CHANGES below here unless you know what you're doing...*
  15  *--------------------------------------------------------------------------*
  16  ****************************************************************************/
  17
  18 /*
  19  * On some systems, FD_SETSIZE is set to something lower than the
  20  * actual number of files which can be opened.  IRIX is one case,
  21  * NetBSD is another.  So here we increase FD_SETSIZE to our
  22  * configure-discovered maximum *before* any system includes.
  23  */
  24 #define CHANGE_FD_SETSIZE 1
  25
  26 /*
  27  * Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
  28  * with glibc 2.2 (or later? remains to be seen). We do this by including
  29  * bits/types.h which defines __FD_SETSIZE first, then we redefine
  30  * __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
  31  * directly, so this is a dirty hack!
  32  */
  33 #if _SQUID_LINUX_ || _SQUID_KFREEBSD_
  34 #undef CHANGE_FD_SETSIZE
  35 #define CHANGE_FD_SETSIZE 0
  36 #include <features.h>
  37 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
  38 #if SQUID_MAXFD > DEFAULT_FD_SETSIZE
  39 #include <bits/types.h>
  40 #if HAVE_LINUX_POSIX_TYPES_H
  41 #include <linux/posix_types.h>
  42 #endif
  43 #undef __FD_SETSIZE
  44 #define __FD_SETSIZE SQUID_MAXFD
  45 #endif
  46 #endif
  47 #endif
  48
  49 /*
  50  * Cannot increase FD_SETSIZE on FreeBSD before 2.2.0, causes select(2)
  51  * to return EINVAL.
  52  * --Marian Durkovic <marian@svf.stuba.sk>
  53  * --Peter Wemm <peter@spinner.DIALix.COM>
  54  */
  55 #if _SQUID_FREEBSD_
  56 #include <osreldate.h>
  57 #if __FreeBSD_version < 220000
  58 #undef CHANGE_FD_SETSIZE
  59 #define CHANGE_FD_SETSIZE 0
  60 #endif
  61 #endif
  62
  63 /*
  64  * Trying to redefine CHANGE_FD_SETSIZE causes a slew of warnings
  65  * on Mac OS X Server.
  66  */
  67 #if _SQUID_APPLE_
  68 #undef CHANGE_FD_SETSIZE
  69 #define CHANGE_FD_SETSIZE 0
  70 #endif
  71
  72 /* Increase FD_SETSIZE if SQUID_MAXFD is bigger */
  73 #if CHANGE_FD_SETSIZE && SQUID_MAXFD > DEFAULT_FD_SETSIZE
  74 #define FD_SETSIZE SQUID_MAXFD
  75 #endif
  76
  77 /*
  78  * Trap unintentional use of fd_set. Must not be used outside the
  79  * select code as it only supports FD_SETSIZE number of filedescriptors
  80  * and Squid may be running with a lot more..
  81  * But only for code linked into Squid, not the helpers.. (unlinkd, pinger)
  82  */
  83 #ifdef SQUID_FDSET_NOUSE
  84 # ifndef SQUID_HELPER
  85 #  define fd_set ERROR_FD_SET_USED
  86 # endif
  87 #endif
  88
  89 #endif /* SQUID_COMPAT_FDSETSIZE_H */
  90