compat/fdsetsize.h

   1 #ifndef SQUID_FDSETSIZE_H
   2 #define SQUID_FDSETSIZE_H
   3
   4 /****************************************************************************
   5  *--------------------------------------------------------------------------*
   6  * DO *NOT* MAKE ANY CHANGES below here unless you know what you're doing...*
   7  *--------------------------------------------------------------------------*
   8  ****************************************************************************/
   9
  10 /* FD_SETSIZE must be redefined before including sys/types.h */
  11 #if 0
  12 /* AYJ: would dearly like to use this to enforce include order
  13         but at present some helpers don't follow the squid include methodology.
  14         that will need fixing later.
  15 */
  16 #ifdef _SYS_TYPES_H
  17 #error squid_fdsetsize.h for FDSETSIZE must be included before sys/types.h
  18 #error Make sure that squid.h or squid-old.h is the first file included by your .cc
  19 #endif
  20 #endif /* 0 */
  21 /*
  22  * On some systems, FD_SETSIZE is set to something lower than the
  23  * actual number of files which can be opened.  IRIX is one case,
  24  * NetBSD is another.  So here we increase FD_SETSIZE to our
  25  * configure-discovered maximum *before* any system includes.
  26  */
  27 #define CHANGE_FD_SETSIZE 1
  28
  29 /*
  30  * Cannot increase FD_SETSIZE on Linux, but we can increase __FD_SETSIZE
  31  * with glibc 2.2 (or later? remains to be seen). We do this by including
  32  * bits/types.h which defines __FD_SETSIZE first, then we redefine
  33  * __FD_SETSIZE. Ofcourse a user program may NEVER include bits/whatever.h
  34  * directly, so this is a dirty hack!
  35  */
  36 #if _SQUID_LINUX_ || _SQUID_KFREEBSD_
  37 #undef CHANGE_FD_SETSIZE
  38 #define CHANGE_FD_SETSIZE 0
  39 #include <features.h>
  40 #if (__GLIBC__ > 2) || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)
  41 #if SQUID_MAXFD > DEFAULT_FD_SETSIZE
  42 #include <bits/types.h>
  43 #if HAVE_LINUX_POSIX_TYPES_H
  44 #include <linux/posix_types.h>
  45 #endif
  46 #undef __FD_SETSIZE
  47 #define __FD_SETSIZE SQUID_MAXFD
  48 #endif
  49 #endif
  50 #endif
  51
  52 /*
  53  * Cannot increase FD_SETSIZE on FreeBSD before 2.2.0, causes select(2)
  54  * to return EINVAL.
  55  * --Marian Durkovic <marian@svf.stuba.sk>
  56  * --Peter Wemm <peter@spinner.DIALix.COM>
  57  */
  58 #if _SQUID_FREEBSD_
  59 #include <osreldate.h>
  60 #if __FreeBSD_version < 220000
  61 #undef CHANGE_FD_SETSIZE
  62 #define CHANGE_FD_SETSIZE 0
  63 #endif
  64 #endif
  65
  66 /*
  67  * Trying to redefine CHANGE_FD_SETSIZE causes a slew of warnings
  68  * on Mac OS X Server.
  69  */
  70 #if _SQUID_APPLE_
  71 #undef CHANGE_FD_SETSIZE
  72 #define CHANGE_FD_SETSIZE 0
  73 #endif
  74
  75 /* Increase FD_SETSIZE if SQUID_MAXFD is bigger */
  76 #if CHANGE_FD_SETSIZE && SQUID_MAXFD > DEFAULT_FD_SETSIZE
  77 #define FD_SETSIZE SQUID_MAXFD
  78 #endif
  79
  80
  81 /*
  82  * Trap unintentional use of fd_set. Must not be used outside the
  83  * select code as it only supports FD_SETSIZE number of filedescriptors
  84  * and Squid may be running with a lot more..
  85  * But only for code linked into Squid, not the helpers.. (unlinkd, pinger)
  86  */
  87 #ifdef SQUID_FDSET_NOUSE
  88 # ifndef SQUID_HELPER
  89 #  define fd_set ERROR_FD_SET_USED
  90 # endif
  91 #endif
  92
  93 #endif /* SQUID_FDSETSIZE_H */