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maint: update almost all copyright ranges to include 2011 Run the new "make update-copyright" rule.
author Jim Meyering <meyering@redhat.com>
date Sat, 01 Jan 2011 20:17:23 +0100
parents d5a74c6ec06b
children ec1d0cf8bdba
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1 # serial 4
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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) 2009-2011 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])
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15 AC_REQUIRE([gl_FUNC_LINK_FOLLOWS_SYMLINK])
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16 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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17 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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18 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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19 AC_CHECK_FUNCS_ONCE([linkat symlink])
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20 AC_CHECK_HEADERS_ONCE([sys/param.h])
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21 if test $ac_cv_func_linkat = no; then
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22 HAVE_LINKAT=0
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23 AC_LIBOBJ([linkat])
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24 AC_LIBOBJ([at-func2])
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25 else
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26 AC_CACHE_CHECK([whether linkat(,AT_SYMLINK_FOLLOW) works],
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27 [gl_cv_func_linkat_follow],
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28 [rm -rf conftest.f1 conftest.f2
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29 touch conftest.f1
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30 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
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31 #include <fcntl.h>
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32 #include <unistd.h>
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33 #ifdef __linux__
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34 /* Linux added linkat in 2.6.16, but did not add AT_SYMLINK_FOLLOW
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35 until 2.6.18. Always replace linkat to support older kernels. */
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36 choke me
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37 #endif
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38 ]], [return linkat (AT_FDCWD, "conftest.f1", AT_FDCWD, "conftest.f2",
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39 AT_SYMLINK_FOLLOW);])],
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40 [gl_cv_func_linkat_follow=yes],
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41 [gl_cv_func_linkat_follow="need runtime check"])
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42 rm -rf conftest.f1 conftest.f2])
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43 AC_CACHE_CHECK([whether linkat handles trailing slash correctly],
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44 [gl_cv_func_linkat_slash],
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45 [rm -rf conftest.a conftest.b conftest.c conftest.d
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46 AC_RUN_IFELSE(
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47 [AC_LANG_PROGRAM(
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48 [[#include <unistd.h>
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49 #include <fcntl.h>
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50 #include <errno.h>
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51 #include <stdio.h>
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52 ]],
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53 [[int result;
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54 int fd;
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55 /* Create a regular file. */
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56 fd = open ("conftest.a", O_CREAT | O_EXCL | O_WRONLY, 0600);
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57 if (fd < 0)
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58 return 1;
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59 if (write (fd, "hello", 5) < 5)
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60 return 2;
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61 if (close (fd) < 0)
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62 return 3;
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63 /* Test whether hard links are supported on the current
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64 device. */
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65 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.b",
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66 AT_SYMLINK_FOLLOW) < 0)
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67 return 0;
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68 result = 0;
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69 /* Test whether a trailing "/" is treated like "/.". */
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70 if (linkat (AT_FDCWD, "conftest.a/", AT_FDCWD, "conftest.c",
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71 AT_SYMLINK_FOLLOW) == 0)
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72 result |= 4;
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73 if (linkat (AT_FDCWD, "conftest.a", AT_FDCWD, "conftest.d/",
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74 AT_SYMLINK_FOLLOW) == 0)
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75 result |= 8;
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76 return result;
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77 ]])],
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78 [gl_cv_func_linkat_slash=yes],
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79 [gl_cv_func_linkat_slash=no],
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80 [# Guess yes on glibc systems, no otherwise.
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81 case "$host_os" in
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82 *-gnu*) gl_cv_func_linkat_slash="guessing yes";;
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83 *) gl_cv_func_linkat_slash="guessing no";;
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84 esac
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85 ])
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86 rm -rf conftest.a conftest.b conftest.c conftest.d])
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87 case "$gl_cv_func_linkat_slash" in
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88 *yes) gl_linkat_slash_bug=0 ;;
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89 *) gl_linkat_slash_bug=1 ;;
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90 esac
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91 if test "$gl_cv_func_linkat_follow" != yes \
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92 || test $gl_linkat_slash_bug = 1; then
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93 REPLACE_LINKAT=1
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94 AC_LIBOBJ([linkat])
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95 AC_DEFINE_UNQUOTED([LINKAT_TRAILING_SLASH_BUG], [$gl_linkat_slash_bug],
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96 [Define to 1 if linkat fails to recognize a trailing slash.])
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97 fi
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98 fi
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99 ])