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annotate m4/getloadavg.m4 @ 37246:5cfb3a67238d

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regex: avoid glibc deadlock during configure glibc has a known bug where certain corruptions of the heap can cause malloc to default to printing a debug message that includes a backtrace, but the act of getting the backtrace uses dlopen which in turn calls into malloc, causing a recursive lock ending in deadlock. Thus, when configure is probing for a known glibc heap corruption bug, the overall configure would hang. The solution suggested by glibc developers is to force malloc to quit printing debug messages, which avoids recursive malloc. * m4/regex.m4 (gl_REGEX): Avoid recursive malloc deadlock when glibc bug 15078 in turn triggers bug 16159. Reported by Michal Privoznik. Signed-off-by: Eric Blake <eblake@redhat.com>
author Eric Blake <eblake@redhat.com>
date Tue, 03 Dec 2013 10:34:13 -0700
parents c741bc27922a
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # Check for getloadavg.
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2
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3 # Copyright (C) 1992-1996, 1999-2000, 2002-2003, 2006, 2008-2013 Free Software
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4 # Foundation, Inc.
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5
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6 # This file is free software; the Free Software Foundation
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7 # gives unlimited permission to copy and/or distribute it,
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8 # with or without modifications, as long as this notice is preserved.
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9
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10 #serial 6
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11
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12 # Autoconf defines AC_FUNC_GETLOADAVG, but that is obsolescent.
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13 # New applications should use gl_GETLOADAVG instead.
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14
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15 # gl_GETLOADAVG
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16 # -------------
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17 AC_DEFUN([gl_GETLOADAVG],
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18 [AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
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19
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20 # Persuade glibc <stdlib.h> to declare getloadavg().
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21 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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22
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23 gl_save_LIBS=$LIBS
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24
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25 # getloadvg is present in libc on glibc >= 2.2, Mac OS X, FreeBSD >= 2.0,
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26 # NetBSD >= 0.9, OpenBSD >= 2.0, Solaris >= 7.
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27 HAVE_GETLOADAVG=1
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28 AC_CHECK_FUNC([getloadavg], [],
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29 [gl_func_getloadavg_done=no
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30
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31 # Some systems with -lutil have (and need) -lkvm as well, some do not.
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32 # On Solaris, -lkvm requires nlist from -lelf, so check that first
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33 # to get the right answer into the cache.
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34 # For kstat on solaris, we need to test for libelf and libkvm to force the
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35 # definition of SVR4 below.
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36 if test $gl_func_getloadavg_done = no; then
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37 AC_CHECK_LIB([elf], [elf_begin], [LIBS="-lelf $LIBS"])
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38 AC_CHECK_LIB([kvm], [kvm_open], [LIBS="-lkvm $LIBS"])
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39 # Check for the 4.4BSD definition of getloadavg.
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40 AC_CHECK_LIB([util], [getloadavg],
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41 [LIBS="-lutil $LIBS" gl_func_getloadavg_done=yes])
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42 fi
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43
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44 if test $gl_func_getloadavg_done = no; then
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45 # There is a commonly available library for RS/6000 AIX.
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46 # Since it is not a standard part of AIX, it might be installed locally.
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47 gl_getloadavg_LIBS=$LIBS
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48 LIBS="-L/usr/local/lib $LIBS"
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49 AC_CHECK_LIB([getloadavg], [getloadavg],
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50 [LIBS="-lgetloadavg $LIBS" gl_func_getloadavg_done=yes],
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51 [LIBS=$gl_getloadavg_LIBS])
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52 fi
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53
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54 # Set up the replacement function if necessary.
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55 if test $gl_func_getloadavg_done = no; then
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56 HAVE_GETLOADAVG=0
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57
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58 # Solaris has libkstat which does not require root.
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59 AC_CHECK_LIB([kstat], [kstat_open])
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60 test $ac_cv_lib_kstat_kstat_open = yes && gl_func_getloadavg_done=yes
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61
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62 # AIX has libperfstat which does not require root
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63 if test $gl_func_getloadavg_done = no; then
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64 AC_CHECK_LIB([perfstat], [perfstat_cpu_total])
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65 test $ac_cv_lib_perfstat_perfstat_cpu_total = yes && gl_func_getloadavg_done=yes
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66 fi
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67
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68 if test $gl_func_getloadavg_done = no; then
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69 AC_CHECK_HEADER([sys/dg_sys_info.h],
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70 [gl_func_getloadavg_done=yes
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71 AC_DEFINE([DGUX], [1], [Define to 1 for DGUX with <sys/dg_sys_info.h>.])
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72 AC_CHECK_LIB([dgc], [dg_sys_info])])
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73 fi
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74 fi])
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75
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76 if test "x$gl_save_LIBS" = x; then
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77 GETLOADAVG_LIBS=$LIBS
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78 else
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79 GETLOADAVG_LIBS=`echo "$LIBS" | sed "s!$gl_save_LIBS!!"`
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80 fi
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81 LIBS=$gl_save_LIBS
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82
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83 AC_SUBST([GETLOADAVG_LIBS])dnl
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84
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85 # Test whether the system declares getloadavg. Solaris has the function
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86 # but declares it in <sys/loadavg.h>, not <stdlib.h>.
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87 AC_CHECK_HEADERS([sys/loadavg.h])
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88 if test $ac_cv_header_sys_loadavg_h = yes; then
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89 HAVE_SYS_LOADAVG_H=1
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90 else
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91 HAVE_SYS_LOADAVG_H=0
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92 fi
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93 AC_CHECK_DECL([getloadavg], [], [HAVE_DECL_GETLOADAVG=0],
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94 [[#if HAVE_SYS_LOADAVG_H
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95 # include <sys/loadavg.h>
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96 #endif
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97 #include <stdlib.h>]])
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98 ])# gl_GETLOADAVG
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99
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100
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101 # gl_PREREQ_GETLOADAVG
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102 # --------------------
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103 # Set up the AC_LIBOBJ replacement of 'getloadavg'.
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104 AC_DEFUN([gl_PREREQ_GETLOADAVG],
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105 [
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106 # Figure out what our getloadavg.c needs.
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107
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108 AC_CHECK_HEADERS_ONCE([sys/param.h])
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109
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110 # On HPUX9, an unprivileged user can get load averages this way.
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111 if test $gl_func_getloadavg_done = no; then
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112 AC_CHECK_FUNCS([pstat_getdynamic], [gl_func_getloadavg_done=yes])
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113 fi
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114
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115 # We cannot check for <dwarf.h>, because Solaris 2 does not use dwarf (it
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116 # uses stabs), but it is still SVR4. We cannot check for <elf.h> because
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117 # Irix 4.0.5F has the header but not the library.
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118 if test $gl_func_getloadavg_done = no && test "$ac_cv_lib_elf_elf_begin" = yes \
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119 && test "$ac_cv_lib_kvm_kvm_open" = yes; then
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120 gl_func_getloadavg_done=yes
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121 AC_DEFINE([SVR4], [1], [Define to 1 on System V Release 4.])
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122 fi
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123
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124 if test $gl_func_getloadavg_done = no; then
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125 AC_CHECK_HEADER([inq_stats/cpustats.h],
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126 [gl_func_getloadavg_done=yes
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127 AC_DEFINE([UMAX], [1], [Define to 1 for Encore UMAX.])
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128 AC_DEFINE([UMAX4_3], [1],
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129 [Define to 1 for Encore UMAX 4.3 that has <inq_status/cpustats.h>
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130 instead of <sys/cpustats.h>.])])
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131 fi
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132
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133 if test $gl_func_getloadavg_done = no; then
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134 AC_CHECK_HEADER([sys/cpustats.h],
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135 [gl_func_getloadavg_done=yes; AC_DEFINE([UMAX])])
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136 fi
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parents: 26934
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137
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parents: 34656
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138 if test $gl_func_getloadavg_done = no; then
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139 AC_CHECK_HEADERS([mach/mach.h])
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140 fi
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141
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142 AC_CHECK_HEADERS([nlist.h],
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143 [AC_CHECK_MEMBERS([struct nlist.n_un.n_name],
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parents: 33770
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144 [], [],
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Bruno Haible <bruno@clisp.org>
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145 [@%:@include <nlist.h>])
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Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
parents: 31437
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146 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <nlist.h>]],
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147 [[struct nlist x;
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148 #ifdef HAVE_STRUCT_NLIST_N_UN_N_NAME
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149 x.n_un.n_name = "";
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150 #else
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151 x.n_name = "";
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152 #endif]])],
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153 [AC_DEFINE([N_NAME_POINTER], [1],
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154 [Define to 1 if the nlist n_name member is a pointer])])
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155 ])dnl
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Paul Eggert <eggert@cs.ucla.edu>
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156 ])# gl_PREREQ_GETLOADAVG