compat/shm.cc

   1 /*
   2  * Copyright (C) 1996-2015 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 #include "squid.h"
  10 #include "compat/shm.h"
  11
  12 #if _SQUID_FREEBSD_ && (__FreeBSD__ >= 7)
  13 #include <sys/sysctl.h>
  14 #endif
  15
  16 /*
  17  * Some systems have filesystem-based resources and interpret segment names
  18  * as file paths. The so-called 'portable' "/name" format does not work well
  19  * for them. And, according to Boost::interprocess, recent FreeBSD versions
  20  * make this decision depending on whether the shm_open() caller is jailed!
  21  */
  22 bool
  23 shm_portable_segment_name_is_path()
  24 {
  25 #if _SQUID_HPUX_ || _SQUID_OSF_ || defined(__vms) || (_SQUID_FREEBSD_ && (__FreeBSD__ < 7)) || _SQUID_DRAGONFLY_
  26     return true;
  27 #elif _SQUID_FREEBSD_
  28     int jailed = 0;
  29     size_t len = sizeof(jailed);
  30     ::sysctlbyname("security.jail.jailed", &jailed, &len, NULL, 0);
  31     return !jailed;
  32 #else
  33     return false;
  34 #endif
  35 }
  36