m4/getloadavg.m4

   1 # Check for getloadavg.
   2
   3 # Copyright (C) 1992-1996, 1999-2000, 2002-2003, 2006, 2008-2014 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 6
  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, Mac OS X, FreeBSD >= 2.0,
  26 # NetBSD >= 0.9, OpenBSD >= 2.0, Solaris >= 7.
  27 HAVE_GETLOADAVG=1
  28 AC_CHECK_FUNC([getloadavg], [],
  29   [gl_func_getloadavg_done=no
  30
  31    # Some systems with -lutil have (and need) -lkvm as well, some do not.
  32    # On Solaris, -lkvm requires nlist from -lelf, so check that first
  33    # to get the right answer into the cache.
  34    # For kstat on solaris, we need to test for libelf and libkvm to force the
  35    # definition of SVR4 below.
  36    if test $gl_func_getloadavg_done = no; then
  37      AC_CHECK_LIB([elf], [elf_begin], [LIBS="-lelf $LIBS"])
  38      AC_CHECK_LIB([kvm], [kvm_open], [LIBS="-lkvm $LIBS"])
  39      # Check for the 4.4BSD definition of getloadavg.
  40      AC_CHECK_LIB([util], [getloadavg],
  41        [LIBS="-lutil $LIBS" gl_func_getloadavg_done=yes])
  42    fi
  43
  44    if test $gl_func_getloadavg_done = no; then
  45      # There is a commonly available library for RS/6000 AIX.
  46      # Since it is not a standard part of AIX, it might be installed locally.
  47      gl_getloadavg_LIBS=$LIBS
  48      LIBS="-L/usr/local/lib $LIBS"
  49      AC_CHECK_LIB([getloadavg], [getloadavg],
  50                   [LIBS="-lgetloadavg $LIBS" gl_func_getloadavg_done=yes],
  51                   [LIBS=$gl_getloadavg_LIBS])
  52    fi
  53
  54    # Set up the replacement function if necessary.
  55    if test $gl_func_getloadavg_done = no; then
  56      HAVE_GETLOADAVG=0
  57
  58      # Solaris has libkstat which does not require root.
  59      AC_CHECK_LIB([kstat], [kstat_open])
  60      test $ac_cv_lib_kstat_kstat_open = yes && gl_func_getloadavg_done=yes
  61
  62      # AIX has libperfstat which does not require root
  63      if test $gl_func_getloadavg_done = no; then
  64        AC_CHECK_LIB([perfstat], [perfstat_cpu_total])
  65        test $ac_cv_lib_perfstat_perfstat_cpu_total = yes && gl_func_getloadavg_done=yes
  66      fi
  67
  68      if test $gl_func_getloadavg_done = no; then
  69        AC_CHECK_HEADER([sys/dg_sys_info.h],
  70          [gl_func_getloadavg_done=yes
  71           AC_DEFINE([DGUX], [1], [Define to 1 for DGUX with <sys/dg_sys_info.h>.])
  72           AC_CHECK_LIB([dgc], [dg_sys_info])])
  73      fi
  74    fi])
  75
  76 if test "x$gl_save_LIBS" = x; then
  77   GETLOADAVG_LIBS=$LIBS
  78 else
  79   GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$gl_save_LIBS!!"`
  80 fi
  81 LIBS=$gl_save_LIBS
  82
  83 AC_SUBST([GETLOADAVG_LIBS])dnl
  84
  85 # Test whether the system declares getloadavg. Solaris has the function
  86 # but declares it in <sys/loadavg.h>, not <stdlib.h>.
  87 AC_CHECK_HEADERS([sys/loadavg.h])
  88 if test $ac_cv_header_sys_loadavg_h = yes; then
  89   HAVE_SYS_LOADAVG_H=1
  90 else
  91   HAVE_SYS_LOADAVG_H=0
  92 fi
  93 AC_CHECK_DECL([getloadavg], [], [HAVE_DECL_GETLOADAVG=0],
  94   [[#if HAVE_SYS_LOADAVG_H
  95     # include <sys/loadavg.h>
  96     #endif
  97     #include <stdlib.h>]])
  98 ])# gl_GETLOADAVG
  99
 100
 101 # gl_PREREQ_GETLOADAVG
 102 # --------------------
 103 # Set up the AC_LIBOBJ replacement of 'getloadavg'.
 104 AC_DEFUN([gl_PREREQ_GETLOADAVG],
 105 [
 106 # Figure out what our getloadavg.c needs.
 107
 108 AC_CHECK_HEADERS_ONCE([sys/param.h])
 109
 110 # On HPUX9, an unprivileged user can get load averages this way.
 111 if test $gl_func_getloadavg_done = no; then
 112   AC_CHECK_FUNCS([pstat_getdynamic], [gl_func_getloadavg_done=yes])
 113 fi
 114
 115 # We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
 116 # uses stabs), but it is still SVR4.  We cannot check for <elf.h> because
 117 # Irix 4.0.5F has the header but not the library.
 118 if test $gl_func_getloadavg_done = no && test "$ac_cv_lib_elf_elf_begin" = yes \
 119     && test "$ac_cv_lib_kvm_kvm_open" = yes; then
 120   gl_func_getloadavg_done=yes
 121   AC_DEFINE([SVR4], [1], [Define to 1 on System V Release 4.])
 122 fi
 123
 124 if test $gl_func_getloadavg_done = no; then
 125   AC_CHECK_HEADER([inq_stats/cpustats.h],
 126   [gl_func_getloadavg_done=yes
 127    AC_DEFINE([UMAX], [1], [Define to 1 for Encore UMAX.])
 128    AC_DEFINE([UMAX4_3], [1],
 129              [Define to 1 for Encore UMAX 4.3 that has <inq_status/cpustats.h>
 130               instead of <sys/cpustats.h>.])])
 131 fi
 132
 133 if test $gl_func_getloadavg_done = no; then
 134   AC_CHECK_HEADER([sys/cpustats.h],
 135   [gl_func_getloadavg_done=yes; AC_DEFINE([UMAX])])
 136 fi
 137
 138 if test $gl_func_getloadavg_done = no; then
 139   AC_CHECK_HEADERS([mach/mach.h])
 140 fi
 141
 142 AC_CHECK_HEADERS([nlist.h],
 143 [AC_CHECK_MEMBERS([struct nlist.n_un.n_name],
 144                   [], [],
 145                   [@%:@include <nlist.h>])
 146  AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <nlist.h>]],
 147                    [[struct nlist x;
 148                     #ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
 149                     x.n_un.n_name = "";
 150                     #else
 151                     x.n_name = "";
 152                     #endif]])],
 153                 [AC_DEFINE([N_NAME_POINTER], [1],
 154                            [Define to 1 if the nlist n_name member is a pointer])])
 155 ])dnl
 156 ])# gl_PREREQ_GETLOADAVG