compat/fdsetsize.h

   1 /*
   2  * Copyright (C) 1996-2014 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_FDSETSIZE_H
  10 #define SQUID_FDSETSIZE_H
  11
  12 /****************************************************************************
  13  *--------------------------------------------------------------------------*
  14  * DO *NOT* MAKE ANY CHANGES below here unless you know what you're doing...*
  15  *--------------------------------------------------------------------------*
  16  ****************************************************************************/
  17
  18 /* FD_SETSIZE must be redefined before including sys/types.h */
  19 #if 0
  20 /* AYJ: would dearly like to use this to enforce include order
  21     but at present some helpers don't follow the squid include methodology.
  22     that will need fixing later.
  23 */
  24 #ifdef _SYS_TYPES_H
  25 #error squid_fdsetsize.h for FDSETSIZE must be included before sys/types.h
  26 #error Make sure that squid.h is the first file included by your .cc
  27 #endif
  28 #endif /* 0 */
  29 /*
  30  * On some systems, FD_SETSIZE is set to something lower than the
  31  * actual number of files which can be opened.  IRIX is one case,
  32  * NetBSD is another.  So here we increase FD_SETSIZE to our
  33  * configure-discovered maximum *before* any system includes.
  34  */
  35 #define CHANGE_FD_SETSIZE 1
  36
  37 /*
  38  * Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
  39  * with glibc 2.2 (or later? remains to be seen). We do this by including
  40  * bits/types.h which defines __FD_SETSIZE first, then we redefine
  41  * __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
  42  * directly, so this is a dirty hack!
  43  */
  44 #if _SQUID_LINUX_ || _SQUID_KFREEBSD_
  45 #undef CHANGE_FD_SETSIZE
  46 #define CHANGE_FD_SETSIZE 0
  47 #include <features.h>
  48 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
  49 #if SQUID_MAXFD > DEFAULT_FD_SETSIZE
  50 #include <bits/types.h>
  51 #if HAVE_LINUX_POSIX_TYPES_H
  52 #include <linux/posix_types.h>
  53 #endif
  54 #undef __FD_SETSIZE
  55 #define __FD_SETSIZE SQUID_MAXFD
  56 #endif
  57 #endif
  58 #endif
  59
  60 /*
  61  * Cannot increase FD_SETSIZE on FreeBSD before 2.2.0, causes select(2)
  62  * to return EINVAL.
  63  * --Marian Durkovic <marian@svf.stuba.sk>
  64  * --Peter Wemm <peter@spinner.DIALix.COM>
  65  */
  66 #if _SQUID_FREEBSD_
  67 #include <osreldate.h>
  68 #if __FreeBSD_version < 220000
  69 #undef CHANGE_FD_SETSIZE
  70 #define CHANGE_FD_SETSIZE 0
  71 #endif
  72 #endif
  73
  74 /*
  75  * Trying to redefine CHANGE_FD_SETSIZE causes a slew of warnings
  76  * on Mac OS X Server.
  77  */
  78 #if _SQUID_APPLE_
  79 #undef CHANGE_FD_SETSIZE
  80 #define CHANGE_FD_SETSIZE 0
  81 #endif
  82
  83 /* Increase FD_SETSIZE if SQUID_MAXFD is bigger */
  84 #if CHANGE_FD_SETSIZE && SQUID_MAXFD > DEFAULT_FD_SETSIZE
  85 #define FD_SETSIZE SQUID_MAXFD
  86 #endif
  87
  88 /*
  89  * Trap unintentional use of fd_set. Must not be used outside the
  90  * select code as it only supports FD_SETSIZE number of filedescriptors
  91  * and Squid may be running with a lot more..
  92  * But only for code linked into Squid, not the helpers.. (unlinkd, pinger)
  93  */
  94 #ifdef SQUID_FDSET_NOUSE
  95 # ifndef SQUID_HELPER
  96 #  define fd_set ERROR_FD_SET_USED
  97 # endif
  98 #endif
  99
 100 #endif /* SQUID_FDSETSIZE_H */
 101