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annotate m4/linkat.m4 @ 17908:074ad7ba0d73

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linkat_nofollow: Add fallback case for cross compiling * m4/linkat.m4: Guess no for Darwin, yes otherwise.
author Kevin Cernekee <cernekee@google.com>
date Wed, 11 Feb 2015 15:22:55 -0800
parents ab58d4870664
children 301a9d4b8f5a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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15025
5cec5df6b606 linkat: Move AC_LIBOBJ invocations to module description.
Bruno Haible <bruno@clisp.org>
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1 # serial 6
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2 # See if we need to provide linkat replacement.
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3
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4 dnl Copyright (C) 2009-2015 Free Software Foundation, Inc.
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5 dnl This file is free software; the Free Software Foundation
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6 dnl gives unlimited permission to copy and/or distribute it,
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7 dnl with or without modifications, as long as this notice is preserved.
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8
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9 # Written by Eric Blake.
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10
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11 AC_DEFUN([gl_FUNC_LINKAT],
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12 [
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13 AC_REQUIRE([gl_FUNC_OPENAT])
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14 AC_REQUIRE([gl_FUNC_LINK_FOLLOWS_SYMLINK])
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15 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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16 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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17 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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18 AC_CHECK_FUNCS_ONCE([linkat symlink])
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19 AC_CHECK_HEADERS_ONCE([sys/param.h])
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20 if test $ac_cv_func_linkat = no; then
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21 HAVE_LINKAT=0
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22 else
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23 dnl OS X Yosemite has linkat() but it's not sufficient
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24 dnl to our needs since it doesn't support creating
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25 dnl hardlinks to symlinks. Therefore check for that
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26 dnl capability before considering using the system version.
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27 AC_CACHE_CHECK([whether linkat() can link symlinks],
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28 [gl_cv_func_linkat_nofollow],
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29 [rm -rf conftest.l1 conftest.l2
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30 ln -s target conftest.l1
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31 AC_RUN_IFELSE([AC_LANG_PROGRAM(
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32 [[#include <fcntl.h>
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33 #include <unistd.h>
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34 ]],
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35 [return linkat (AT_FDCWD, "conftest.l1", AT_FDCWD,
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36 "conftest.l2", 0);
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37 ])],
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38 [gl_cv_func_linkat_nofollow=yes
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39 LINKAT_SYMLINK_NOTSUP=0],
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40 [gl_cv_func_linkat_nofollow=no
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41 LINKAT_SYMLINK_NOTSUP=1],
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42 [case "$host_os" in
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43 darwin*)
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44 gl_cv_func_linkat_nofollow="guessing no"
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45 LINKAT_SYMLINK_NOTSUP=1 ;;
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46 *)
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47 gl_cv_func_linkat_nofollow="guessing yes"
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48 LINKAT_SYMLINK_NOTSUP=0 ;;
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49 esac])
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50
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51 rm -rf conftest.l1 conftest.l2])
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52
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53 AC_CACHE_CHECK([whether linkat handles trailing slash correctly],
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54 [gl_cv_func_linkat_slash],
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55 [rm -rf conftest.a conftest.b conftest.c conftest.d
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56 AC_RUN_IFELSE(
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57 [AC_LANG_PROGRAM(
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58 [[#include <unistd.h>
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59 #include <fcntl.h>
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60 #include <errno.h>
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61 #include <stdio.h>
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62 ]],
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63 [[int result;
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64 int fd;
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65 /* Create a regular file. */
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66 fd = open ("conftest.a", O_CREAT | O_EXCL | O_WRONLY, 0600);
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67 if (fd < 0)
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68 return 1;
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69 if (write (fd, "hello", 5) < 5)
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70 return 2;
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71 if (close (fd) < 0)
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72 return 3;
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73 /* Test whether hard links are supported on the current
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74 device. */
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75 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.b",
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76 AT_SYMLINK_FOLLOW) < 0)
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77 return 0;
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78 result = 0;
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79 /* Test whether a trailing "/" is treated like "/.". */
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80 if (linkat (AT_FDCWD, "conftest.a/", AT_FDCWD, "conftest.c",
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81 AT_SYMLINK_FOLLOW) == 0)
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82 result |= 4;
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83 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.d/",
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84 AT_SYMLINK_FOLLOW) == 0)
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85 result |= 8;
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86 return result;
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87 ]])],
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88 [gl_cv_func_linkat_slash=yes],
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89 [gl_cv_func_linkat_slash=no],
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90 [# Guess yes on glibc systems, no otherwise.
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91 case "$host_os" in
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92 *-gnu*) gl_cv_func_linkat_slash="guessing yes";;
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93 *) gl_cv_func_linkat_slash="guessing no";;
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94 esac
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95 ])
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96 rm -rf conftest.a conftest.b conftest.c conftest.d])
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97 case "$gl_cv_func_linkat_slash" in
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98 *yes) gl_linkat_slash_bug=0 ;;
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99 *) gl_linkat_slash_bug=1 ;;
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100 esac
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101
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102 case "$gl_cv_func_linkat_nofollow" in
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103 *yes) linkat_nofollow=yes ;;
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104 *) linkat_nofollow=no ;;
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105 esac
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106
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107 if test "$linkat_nofollow" != yes \
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108 || test $gl_linkat_slash_bug = 1; then
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109 REPLACE_LINKAT=1
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110 AC_DEFINE_UNQUOTED([LINKAT_TRAILING_SLASH_BUG], [$gl_linkat_slash_bug],
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111 [Define to 1 if linkat fails to recognize a trailing slash.])
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112 AC_DEFINE_UNQUOTED([LINKAT_SYMLINK_NOTSUP], [$LINKAT_SYMLINK_NOTSUP],
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113 [Define to 1 if linkat can create hardlinks to symlinks])
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114 fi
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115 fi
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116 ])