external/bsd/ntp/dist/lib/isc/unix/os.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: os.c,v 1.18 2007/06/19 23:47:18 tbox Exp */
  21
  22 #include <config.h>
  23
  24 #include <isc/os.h>
  25
  26
  27 #ifdef HAVE_SYSCONF
  28
  29 #include <unistd.h>
  30
  31 #ifndef __hpux
  32 static inline long
  33 sysconf_ncpus(void) {
  34 #if defined(_SC_NPROCESSORS_ONLN)
  35         return sysconf((_SC_NPROCESSORS_ONLN));
  36 #elif defined(_SC_NPROC_ONLN)
  37         return sysconf((_SC_NPROC_ONLN));
  38 #else
  39         return (0);
  40 #endif
  41 }
  42 #endif
  43 #endif /* HAVE_SYSCONF */
  44
  45
  46 #ifdef __hpux
  47
  48 #include <sys/pstat.h>
  49
  50 static inline int
  51 hpux_ncpus(void) {
  52         struct pst_dynamic psd;
  53         if (pstat_getdynamic(&psd, sizeof(psd), 1, 0) != -1)
  54                 return (psd.psd_proc_cnt);
  55         else
  56                 return (0);
  57 }
  58
  59 #endif /* __hpux */
  60
  61 #if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
  62 #include <sys/types.h>  /* for FreeBSD */
  63 #include <sys/param.h>  /* for NetBSD */
  64 #include <sys/sysctl.h>
  65
  66 static int
  67 sysctl_ncpus(void) {
  68         int ncpu, result;
  69         size_t len;
  70
  71         len = sizeof(ncpu);
  72         result = sysctlbyname("hw.ncpu", &ncpu, &len , 0, 0);
  73         if (result != -1)
  74                 return (ncpu);
  75         return (0);
  76 }
  77 #endif
  78
  79 unsigned int
  80 isc_os_ncpus(void) {
  81         long ncpus = 0;
  82
  83 #ifdef __hpux
  84         ncpus = hpux_ncpus();
  85 #elif defined(HAVE_SYSCONF)
  86         ncpus = sysconf_ncpus();
  87 #endif
  88 #if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTLBYNAME)
  89         if (ncpus <= 0)
  90                 ncpus = sysctl_ncpus();
  91 #endif
  92         if (ncpus <= 0)
  93                 ncpus = 1;
  94
  95         return ((unsigned int)ncpus);
  96 }