contrib/bind-9.2.4rc7/lib/isc/unix/os.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and 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 1.11.2.2 2004/05/18 01:38:39 marka 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 static inline long
  30 sysconf_ncpus(void) {
  31 #if defined(_SC_NPROCESSORS_ONLN)
  32         return sysconf((_SC_NPROCESSORS_ONLN));
  33 #elif defined(_SC_NPROC_ONLN)
  34         return sysconf((_SC_NPROC_ONLN));
  35 #else
  36         return (0);
  37 #endif
  38 }
  39 #endif /* HAVE_SYSCONF */
  40
  41
  42 #ifdef __hpux
  43
  44 #include <sys/pstat.h>
  45
  46 static inline int
  47 hpux_ncpus(void) {
  48         struct pst_dynamic psd;
  49         if (pstat_getdynamic(&psd, sizeof(psd), 1, 0) != -1)
  50                 return (psd.psd_proc_cnt);
  51         else
  52                 return (0);
  53 }
  54
  55 #endif /* __hpux */
  56
  57 #if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
  58 #include <sys/types.h>  /* for FreeBSD */
  59 #include <sys/param.h>  /* for NetBSD */
  60 #include <sys/sysctl.h>
  61
  62 static int
  63 sysctl_ncpus(void) {
  64         int ncpu, result;
  65         size_t len;
  66
  67         len = sizeof ncpu;
  68         result = sysctlbyname("hw.ncpu", &ncpu, &len , 0, 0);
  69         if (result != -1)
  70                 return (ncpu);
  71         return (0);
  72 }
  73 #endif
  74
  75 unsigned int
  76 isc_os_ncpus(void) {
  77         long ncpus = 0;
  78
  79 #ifdef __hpux
  80         ncpus = hpux_ncpus();
  81 #elif defined(HAVE_SYSCONF)
  82         ncpus = sysconf_ncpus();
  83 #endif
  84 #if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
  85         if (ncpus <= 0)
  86                 ncpus = sysctl_ncpus();
  87 #endif
  88         if (ncpus <= 0)
  89                 ncpus = 1;
  90
  91         return ((unsigned int)ncpus);
  92 }