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author Karl Berry <karl@freefriends.org>
date Mon, 24 Aug 2015 06:09:19 -0700
parents bbdce0795bb7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # serial 7
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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 $ac_cv_func_linkat = no; then
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21 HAVE_LINKAT=0
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22 else
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23 dnl OS X Yosemite has linkat() but it's not sufficient
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24 dnl to our needs since it doesn't support creating
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25 dnl hardlinks to symlinks. Therefore check for that
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26 dnl capability before considering using the system version.
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27 AC_CACHE_CHECK([whether linkat() can link symlinks],
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28 [gl_cv_func_linkat_nofollow],
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29 [rm -rf conftest.l1 conftest.l2
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30 ln -s target conftest.l1
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31 AC_RUN_IFELSE([AC_LANG_PROGRAM(
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32 [[#include <fcntl.h>
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33 #include <unistd.h>
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34 ]],
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35 [return linkat (AT_FDCWD, "conftest.l1", AT_FDCWD,
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36 "conftest.l2", 0);
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37 ])],
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38 [gl_cv_func_linkat_nofollow=yes],
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39 [gl_cv_func_linkat_nofollow=no],
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40 [case "$host_os" in
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41 darwin*) gl_cv_func_linkat_nofollow="guessing no" ;;
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42 *) gl_cv_func_linkat_nofollow="guessing yes" ;;
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43 esac])
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44
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45 rm -rf conftest.l1 conftest.l2])
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46
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47 case $gl_cv_func_linkat_nofollow in
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48 *no) LINKAT_SYMLINK_NOTSUP=1 ;;
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49 *yes) LINKAT_SYMLINK_NOTSUP=0 ;;
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50 esac
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51
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52 AC_CACHE_CHECK([whether linkat handles trailing slash correctly],
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53 [gl_cv_func_linkat_slash],
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54 [rm -rf conftest.a conftest.b conftest.c conftest.d conftest.e conftest.s
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55 AC_RUN_IFELSE(
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56 [AC_LANG_PROGRAM(
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57 [[#include <unistd.h>
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58 #include <fcntl.h>
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59 #include <errno.h>
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60 #include <stdio.h>
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61 ]],
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62 [[int result;
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63 int fd;
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64 /* Create a regular file. */
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65 fd = open ("conftest.a", O_CREAT | O_EXCL | O_WRONLY, 0600);
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66 if (fd < 0)
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67 return 1;
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68 if (write (fd, "hello", 5) < 5)
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69 return 2;
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70 if (close (fd) < 0)
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71 return 3;
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72 /* Test whether hard links are supported on the current
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73 device. */
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74 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.b",
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75 AT_SYMLINK_FOLLOW) < 0)
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76 return 0;
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77 result = 0;
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78 /* Test whether a trailing "/" is treated like "/.". */
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79 if (linkat (AT_FDCWD, "conftest.a/", AT_FDCWD, "conftest.c",
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80 AT_SYMLINK_FOLLOW) == 0)
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81 result |= 4;
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82 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.d/",
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83 AT_SYMLINK_FOLLOW) == 0)
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84 result |= 8;
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85
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86 /* On OS X 10.10 a trailing "/" will cause the second path to be
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87 dereferenced, and thus will succeed on a dangling symlink. */
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88 if (symlink ("conftest.e", "conftest.s") == 0)
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89 {
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90 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.s/",
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91 AT_SYMLINK_FOLLOW) == 0)
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92 result |= 16;
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93 }
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94
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95 return result;
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96 ]])],
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97 [gl_cv_func_linkat_slash=yes],
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98 [gl_cv_func_linkat_slash=no],
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99 [# Guess yes on glibc systems, no otherwise.
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100 case "$host_os" in
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101 *-gnu*) gl_cv_func_linkat_slash="guessing yes";;
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102 *) gl_cv_func_linkat_slash="guessing no";;
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103 esac
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104 ])
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105 rm -rf conftest.a conftest.b conftest.c conftest.d conftest.e conftest.s])
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106 case "$gl_cv_func_linkat_slash" in
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107 *yes) gl_linkat_slash_bug=0 ;;
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108 *) gl_linkat_slash_bug=1 ;;
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109 esac
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110
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111 case "$gl_cv_func_linkat_nofollow" in
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112 *yes) linkat_nofollow=yes ;;
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113 *) linkat_nofollow=no ;;
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114 esac
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115
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116 if test "$linkat_nofollow" != yes \
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117 || test $gl_linkat_slash_bug = 1; then
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118 REPLACE_LINKAT=1
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119 AC_DEFINE_UNQUOTED([LINKAT_TRAILING_SLASH_BUG], [$gl_linkat_slash_bug],
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120 [Define to 1 if linkat fails to recognize a trailing slash.])
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121 AC_DEFINE_UNQUOTED([LINKAT_SYMLINK_NOTSUP], [$LINKAT_SYMLINK_NOTSUP],
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122 [Define to 1 if linkat can create hardlinks to symlinks])
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123 fi
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124 fi
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125 ])