contrib/bind-9.5.2/lib/isc/unix/os.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: os.c,v 1.18 2007/06/19 23:47:18 tbox Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <isc/os.h>
  23
  24
  25 #ifdef HAVE_SYSCONF
  26
  27 #include <unistd.h>
  28
  29 #ifndef __hpux
  30 static inline long
  31 sysconf_ncpus(void) {
  32 #if defined(_SC_NPROCESSORS_ONLN)
  33         return sysconf((_SC_NPROCESSORS_ONLN));
  34 #elif defined(_SC_NPROC_ONLN)
  35         return sysconf((_SC_NPROC_ONLN));
  36 #else
  37         return (0);
  38 #endif
  39 }
  40 #endif
  41 #endif /* HAVE_SYSCONF */
  42
  43
  44 #ifdef __hpux
  45
  46 #include <sys/pstat.h>
  47
  48 static inline int
  49 hpux_ncpus(void) {
  50         struct pst_dynamic psd;
  51         if (pstat_getdynamic(&psd, sizeof(psd), 1, 0) != -1)
  52                 return (psd.psd_proc_cnt);
  53         else
  54                 return (0);
  55 }
  56
  57 #endif /* __hpux */
  58
  59 #if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
  60 #include <sys/types.h>  /* for FreeBSD */
  61 #include <sys/param.h>  /* for NetBSD */
  62 #include <sys/sysctl.h>
  63
  64 static int
  65 sysctl_ncpus(void) {
  66         int ncpu, result;
  67         size_t len;
  68
  69         len = sizeof(ncpu);
  70         result = sysctlbyname("hw.ncpu", &ncpu, &len , 0, 0);
  71         if (result != -1)
  72                 return (ncpu);
  73         return (0);
  74 }
  75 #endif
  76
  77 unsigned int
  78 isc_os_ncpus(void) {
  79         long ncpus = 0;
  80
  81 #ifdef __hpux
  82         ncpus = hpux_ncpus();
  83 #elif defined(HAVE_SYSCONF)
  84         ncpus = sysconf_ncpus();
  85 #endif
  86 #if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
  87         if (ncpus <= 0)
  88                 ncpus = sysctl_ncpus();
  89 #endif
  90         if (ncpus <= 0)
  91                 ncpus = 1;
  92
  93         return ((unsigned int)ncpus);
  94 }