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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 6eb23dad34b3
children 074ad7ba0d73
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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15025
5cec5df6b606 linkat: Move AC_LIBOBJ invocations to module description.
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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 rm -rf conftest.l1 conftest.l2])
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43
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44 AC_CACHE_CHECK([whether linkat handles trailing slash correctly],
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45 [gl_cv_func_linkat_slash],
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46 [rm -rf conftest.a conftest.b conftest.c conftest.d
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47 AC_RUN_IFELSE(
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48 [AC_LANG_PROGRAM(
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49 [[#include <unistd.h>
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50 #include <fcntl.h>
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51 #include <errno.h>
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52 #include <stdio.h>
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53 ]],
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54 [[int result;
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55 int fd;
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56 /* Create a regular file. */
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57 fd = open ("conftest.a", O_CREAT | O_EXCL | O_WRONLY, 0600);
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58 if (fd < 0)
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59 return 1;
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60 if (write (fd, "hello", 5) < 5)
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61 return 2;
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62 if (close (fd) < 0)
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63 return 3;
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64 /* Test whether hard links are supported on the current
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65 device. */
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66 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.b",
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67 AT_SYMLINK_FOLLOW) < 0)
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68 return 0;
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69 result = 0;
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70 /* Test whether a trailing "/" is treated like "/.". */
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71 if (linkat (AT_FDCWD, "conftest.a/", AT_FDCWD, "conftest.c",
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72 AT_SYMLINK_FOLLOW) == 0)
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73 result |= 4;
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74 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.d/",
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75 AT_SYMLINK_FOLLOW) == 0)
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76 result |= 8;
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77 return result;
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78 ]])],
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79 [gl_cv_func_linkat_slash=yes],
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80 [gl_cv_func_linkat_slash=no],
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81 [# Guess yes on glibc systems, no otherwise.
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82 case "$host_os" in
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83 *-gnu*) gl_cv_func_linkat_slash="guessing yes";;
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84 *) gl_cv_func_linkat_slash="guessing no";;
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85 esac
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86 ])
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87 rm -rf conftest.a conftest.b conftest.c conftest.d])
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88 case "$gl_cv_func_linkat_slash" in
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89 *yes) gl_linkat_slash_bug=0 ;;
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90 *) gl_linkat_slash_bug=1 ;;
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91 esac
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92
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93 if test "$gl_cv_func_linkat_nofollow" != yes \
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94 || test $gl_linkat_slash_bug = 1; then
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95 REPLACE_LINKAT=1
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96 AC_DEFINE_UNQUOTED([LINKAT_TRAILING_SLASH_BUG], [$gl_linkat_slash_bug],
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97 [Define to 1 if linkat fails to recognize a trailing slash.])
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98 AC_DEFINE_UNQUOTED([LINKAT_SYMLINK_NOTSUP], [$LINKAT_SYMLINK_NOTSUP],
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99 [Define to 1 if linkat can create hardlinks to symlinks])
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100 fi
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101 fi
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102 ])