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annotate m4/euidaccess.m4 @ 17848:ab58d4870664

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version-etc: new year * doc/gnulib.texi: * lib/version-etc.c (COPYRIGHT_YEAR): Update copyright date. * all files: Run 'make update-copyright'.
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 01 Jan 2015 01:38:23 +0000
parents 344018b6e5d7
children
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1 # euidaccess.m4 serial 15
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2 dnl Copyright (C) 2002-2015 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_NONREENTRANT_EUIDACCESS],
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8 [
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9 AC_REQUIRE([gl_FUNC_EUIDACCESS])
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10 AC_CHECK_DECLS([setregid])
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11 AC_DEFINE([PREFER_NONREENTRANT_EUIDACCESS], [1],
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12 [Define this if you prefer euidaccess to return the correct result
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13 even if this would make it nonreentrant. Define this only if your
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14 entire application is safe even if the uid or gid might temporarily
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15 change. If your application uses signal handlers or threads it
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16 is probably not safe.])
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17 ])
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18
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19 AC_DEFUN([gl_FUNC_EUIDACCESS],
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20 [
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21 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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22
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23 dnl Persuade glibc <unistd.h> to declare euidaccess().
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24 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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25
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26 AC_CHECK_FUNCS([euidaccess])
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27 if test $ac_cv_func_euidaccess = no; then
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28 HAVE_EUIDACCESS=0
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29 fi
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30 ])
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31
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32 # Prerequisites of lib/euidaccess.c.
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33 AC_DEFUN([gl_PREREQ_EUIDACCESS], [
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34 dnl Prefer POSIX faccessat over non-standard euidaccess.
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35 AC_CHECK_FUNCS_ONCE([faccessat])
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36 dnl Try various other non-standard fallbacks.
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37 AC_CHECK_HEADERS([libgen.h])
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38 AC_FUNC_GETGROUPS
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39
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40 # Solaris 9 and 10 need -lgen to get the eaccess function.
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41 # Save and restore LIBS so -lgen isn't added to it. Otherwise, *all*
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42 # programs in the package would end up linked with that potentially-shared
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43 # library, inducing unnecessary run-time overhead.
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44 LIB_EACCESS=
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45 AC_SUBST([LIB_EACCESS])
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46 gl_saved_libs=$LIBS
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47 AC_SEARCH_LIBS([eaccess], [gen],
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48 [test "$ac_cv_search_eaccess" = "none required" ||
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49 LIB_EACCESS=$ac_cv_search_eaccess])
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50 AC_CHECK_FUNCS([eaccess])
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51 LIBS=$gl_saved_libs
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52 ])