m4/getloadavg.m4

   1 # Check for getloadavg.
   2
   3 # Copyright (C) 1992-1996, 1999-2000, 2002-2003, 2006, 2008-2011 Free Software
   4 # Foundation, Inc.
   5
   6 # This file is free software; the Free Software Foundation
   7 # gives unlimited permission to copy and/or distribute it,
   8 # with or without modifications, as long as this notice is preserved.
   9
  10 #serial 3
  11
  12 # Autoconf defines AC_FUNC_GETLOADAVG, but that is obsolescent.
  13 # New applications should use gl_GETLOADAVG instead.
  14
  15 # gl_GETLOADAVG
  16 # -------------
  17 AC_DEFUN([gl_GETLOADAVG],
  18 [AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  19
  20 # Persuade glibc <stdlib.h> to declare getloadavg().
  21 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  22
  23 gl_save_LIBS=$LIBS
  24
  25 # getloadvg is present in libc on glibc >= 2.2, MacOS X, FreeBSD >= 2.0,
  26 # NetBSD >= 0.9, OpenBSD >= 2.0, Solaris >= 7.
  27 AC_CHECK_FUNC([getloadavg], [],
  28   [gl_have_func=no
  29
  30    # Some systems with -lutil have (and need) -lkvm as well, some do not.
  31    # On Solaris, -lkvm requires nlist from -lelf, so check that first
  32    # to get the right answer into the cache.
  33    # For kstat on solaris, we need to test for libelf and libkvm to force the
  34    # definition of SVR4 below.
  35    if test $gl_have_func = no; then
  36      AC_CHECK_LIB([elf], [elf_begin], [LIBS="-lelf $LIBS"])
  37      AC_CHECK_LIB([kvm], [kvm_open], [LIBS="-lkvm $LIBS"])
  38      # Check for the 4.4BSD definition of getloadavg.
  39      AC_CHECK_LIB([util], [getloadavg],
  40        [LIBS="-lutil $LIBS" gl_have_func=yes])
  41    fi
  42
  43    if test $gl_have_func = no; then
  44      # There is a commonly available library for RS/6000 AIX.
  45      # Since it is not a standard part of AIX, it might be installed locally.
  46      gl_getloadavg_LIBS=$LIBS
  47      LIBS="-L/usr/local/lib $LIBS"
  48      AC_CHECK_LIB([getloadavg], [getloadavg],
  49                   [LIBS="-lgetloadavg $LIBS" gl_have_func=yes],
  50                   [LIBS=$gl_getloadavg_LIBS])
  51    fi
  52
  53    # Set up the replacement function if necessary.
  54    if test $gl_have_func = no; then
  55      AC_LIBOBJ([getloadavg])
  56      gl_PREREQ_GETLOADAVG
  57    fi])
  58
  59 if test "x$gl_save_LIBS" = x; then
  60   GETLOADAVG_LIBS=$LIBS
  61 else
  62   GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$gl_save_LIBS!!"`
  63 fi
  64 LIBS=$gl_save_LIBS
  65
  66 AC_SUBST([GETLOADAVG_LIBS])dnl
  67
  68 # Test whether the system declares getloadavg. Solaris has the function
  69 # but declares it in <sys/loadavg.h>, not <stdlib.h>.
  70 AC_CHECK_HEADERS([sys/loadavg.h])
  71 if test $ac_cv_header_sys_loadavg_h = yes; then
  72   HAVE_SYS_LOADAVG_H=1
  73 else
  74   HAVE_SYS_LOADAVG_H=0
  75 fi
  76 AC_CHECK_DECL([getloadavg], [], [HAVE_DECL_GETLOADAVG=0],
  77   [#if HAVE_SYS_LOADAVG_H
  78    # include <sys/loadavg.h>
  79    #endif
  80    #include <stdlib.h>])
  81 ])# gl_GETLOADAVG
  82
  83
  84 # gl_PREREQ_GETLOADAVG
  85 # --------------------
  86 # Set up the AC_LIBOBJ replacement of `getloadavg'.
  87 AC_DEFUN([gl_PREREQ_GETLOADAVG],
  88 [
  89 # Figure out what our getloadavg.c needs.
  90
  91 # Solaris has libkstat which does not require root.
  92 AC_CHECK_LIB([kstat], [kstat_open])
  93 test $ac_cv_lib_kstat_kstat_open = yes && gl_have_func=yes
  94
  95 # On HPUX9, an unprivileged user can get load averages this way.
  96 if test $gl_have_func = no; then
  97   AC_CHECK_FUNCS([pstat_getdynamic], [gl_have_func=yes])
  98 fi
  99
 100 # AIX has libperfstat which does not require root
 101 if test $gl_have_func = no; then
 102   AC_CHECK_LIB([perfstat], [perfstat_cpu_total])
 103   test $ac_cv_lib_perfstat_perfstat_cpu_total = yes && gl_have_func=yes
 104 fi
 105
 106 if test $gl_have_func = no; then
 107   AC_CHECK_HEADER([sys/dg_sys_info.h],
 108     [gl_have_func=yes
 109      AC_DEFINE([DGUX], [1], [Define to 1 for DGUX with <sys/dg_sys_info.h>.])
 110      AC_CHECK_LIB([dgc], [dg_sys_info])])
 111 fi
 112
 113 # We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
 114 # uses stabs), but it is still SVR4.  We cannot check for <elf.h> because
 115 # Irix 4.0.5F has the header but not the library.
 116 if test $gl_have_func = no && test "$ac_cv_lib_elf_elf_begin" = yes \
 117     && test "$ac_cv_lib_kvm_kvm_open" = yes; then
 118   gl_have_func=yes
 119   AC_DEFINE([SVR4], [1], [Define to 1 on System V Release 4.])
 120 fi
 121
 122 if test $gl_have_func = no; then
 123   AC_CHECK_HEADER([inq_stats/cpustats.h],
 124   [gl_have_func=yes
 125    AC_DEFINE([UMAX], [1], [Define to 1 for Encore UMAX.])
 126    AC_DEFINE([UMAX4_3], [1],
 127              [Define to 1 for Encore UMAX 4.3 that has <inq_status/cpustats.h>
 128               instead of <sys/cpustats.h>.])])
 129 fi
 130
 131 if test $gl_have_func = no; then
 132   AC_CHECK_HEADER([sys/cpustats.h],
 133   [gl_have_func=yes; AC_DEFINE([UMAX])])
 134 fi
 135
 136 if test $gl_have_func = no; then
 137   AC_CHECK_HEADERS([mach/mach.h])
 138 fi
 139
 140 AC_CHECK_HEADERS([nlist.h],
 141 [AC_CHECK_MEMBERS([struct nlist.n_un.n_name],
 142                   [], [],
 143                   [@%:@include <nlist.h>])
 144  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <nlist.h>]],
 145                    [[struct nlist x;
 146                     #ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
 147                     x.n_un.n_name = "";
 148                     #else
 149                     x.n_name = "";
 150                     #endif]])],
 151                 [AC_DEFINE([N_NAME_POINTER], [1],
 152                            [Define to 1 if the nlist n_name member is a pointer])])
 153 ])dnl
 154 ])# gl_PREREQ_GETLOADAVG