code.delx.au - gnu-emacs/blob - 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 2
  11
  12 # Autoconf defines AC_FUNC_GETLOADAVG, but that is obsolescent.
  13 # New applications should use gl_GETLOADAVG instead.
  14
  15 # gl_GETLOADAVG(LIBOBJDIR)
  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 # Make sure getloadavg.c is where it belongs, at configure-time.
  24 test -f "$srcdir/$1/getloadavg.c" ||
  25   AC_MSG_ERROR([$srcdir/$1/getloadavg.c is missing])
  26
  27 gl_save_LIBS=$LIBS
  28
  29 AC_CHECK_FUNC([getloadavg], [],
  30   [gl_have_func=no
  31
  32    # Some systems with -lutil have (and need) -lkvm as well, some do not.
  33    # On Solaris, -lkvm requires nlist from -lelf, so check that first
  34    # to get the right answer into the cache.
  35    # For kstat on solaris, we need to test for libelf and libkvm to force the
  36    # definition of SVR4 below.
  37    if test $gl_have_func = no; then
  38      AC_CHECK_LIB([elf], [elf_begin], [LIBS="-lelf $LIBS"])
  39      AC_CHECK_LIB([kvm], [kvm_open], [LIBS="-lkvm $LIBS"])
  40      # Check for the 4.4BSD definition of getloadavg.
  41      AC_CHECK_LIB([util], [getloadavg],
  42        [LIBS="-lutil $LIBS" gl_have_func=yes])
  43    fi
  44
  45    if test $gl_have_func = no; then
  46      # There is a commonly available library for RS/6000 AIX.
  47      # Since it is not a standard part of AIX, it might be installed locally.
  48      gl_getloadavg_LIBS=$LIBS
  49      LIBS="-L/usr/local/lib $LIBS"
  50      AC_CHECK_LIB([getloadavg], [getloadavg],
  51                   [LIBS="-lgetloadavg $LIBS" gl_have_func=yes],
  52                   [LIBS=$gl_getloadavg_LIBS])
  53    fi
  54
  55    # Set up the replacement function if necessary.
  56    if test $gl_have_func = no; then
  57      AC_LIBOBJ([getloadavg])
  58      gl_PREREQ_GETLOADAVG
  59    fi])
  60
  61 if test "x$gl_save_LIBS" = x; then
  62   GETLOADAVG_LIBS=$LIBS
  63 else
  64   GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$gl_save_LIBS!!"`
  65 fi
  66 LIBS=$gl_save_LIBS
  67
  68 AC_SUBST([GETLOADAVG_LIBS])dnl
  69
  70 # Test whether the system declares getloadavg. Solaris has the function
  71 # but declares it in <sys/loadavg.h>, not <stdlib.h>.
  72 AC_CHECK_HEADERS([sys/loadavg.h])
  73 if test $ac_cv_header_sys_loadavg_h = yes; then
  74   HAVE_SYS_LOADAVG_H=1
  75 else
  76   HAVE_SYS_LOADAVG_H=0
  77 fi
  78 AC_CHECK_DECL([getloadavg], [], [HAVE_DECL_GETLOADAVG=0],
  79   [#if HAVE_SYS_LOADAVG_H
  80    # include <sys/loadavg.h>
  81    #endif
  82    #include <stdlib.h>])
  83 ])# gl_GETLOADAVG
  84
  85
  86 # gl_PREREQ_GETLOADAVG
  87 # --------------------
  88 # Set up the AC_LIBOBJ replacement of `getloadavg'.
  89 AC_DEFUN([gl_PREREQ_GETLOADAVG],
  90 [
  91 # Figure out what our getloadavg.c needs.
  92
  93 # Solaris has libkstat which does not require root.
  94 AC_CHECK_LIB([kstat], [kstat_open])
  95 test $ac_cv_lib_kstat_kstat_open = yes && gl_have_func=yes
  96
  97 # On HPUX9, an unprivileged user can get load averages this way.
  98 if test $gl_have_func = no; then
  99   AC_CHECK_FUNCS([pstat_getdynamic], [gl_have_func=yes])
 100 fi
 101
 102 # AIX has libperfstat which does not require root
 103 if test $gl_have_func = no; then
 104   AC_CHECK_LIB([perfstat], [perfstat_cpu_total])
 105   test $ac_cv_lib_perfstat_perfstat_cpu_total = yes && gl_have_func=yes
 106 fi
 107
 108 if test $gl_have_func = no; then
 109   AC_CHECK_HEADER([sys/dg_sys_info.h],
 110     [gl_have_func=yes
 111      AC_DEFINE([DGUX], [1], [Define to 1 for DGUX with <sys/dg_sys_info.h>.])
 112      AC_CHECK_LIB([dgc], [dg_sys_info])])
 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 $gl_have_func = no && test "$ac_cv_lib_elf_elf_begin" = yes \
 119     && test "$ac_cv_lib_kvm_kvm_open" = yes; then
 120   gl_have_func=yes
 121   AC_DEFINE([SVR4], [1], [Define to 1 on System V Release 4.])
 122 fi
 123
 124 if test $gl_have_func = no; then
 125   AC_CHECK_HEADER([inq_stats/cpustats.h],
 126   [gl_have_func=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_have_func = no; then
 134   AC_CHECK_HEADER([sys/cpustats.h],
 135   [gl_have_func=yes; AC_DEFINE([UMAX])])
 136 fi
 137
 138 if test $gl_have_func = 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