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annotate lib/link.c @ 11583:dc80f2cc1327

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Second attempt to work around an AIX 5.3, 6.1 compiler bug with include_next.
author Eric Blake <ebb9@byu.net>
date Thu, 21 May 2009 16:48:12 +0200
parents 2921cdaa1164
children 7e5f9267c62e
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11041
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1 /* Emulate link on platforms that lack it, namely native Windows platforms.
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2
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3 Copyright (C) 2009 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 #include <config.h>
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20
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21 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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22
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23 #define WIN32_LEAN_AND_MEAN
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24 #include <unistd.h>
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25 #include <windows.h>
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26
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27 #include <errno.h>
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28
11063
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29 /* CreateHardLink was introduced only in Windows 2000. */
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30 typedef BOOL (WINAPI * CreateHardLinkFuncType) (LPCTSTR lpFileName,
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31 LPCTSTR lpExistingFileName,
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32 LPSECURITY_ATTRIBUTES lpSecurityAttributes);
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33 static CreateHardLinkFuncType CreateHardLinkFunc = NULL;
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34 static BOOL initialized = FALSE;
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35
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36 static void
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37 initialize (void)
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38 {
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39 HMODULE kernel32 = LoadLibrary ("kernel32.dll");
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40 if (kernel32 != NULL)
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41 {
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42 CreateHardLinkFunc =
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43 (CreateHardLinkFuncType) GetProcAddress (kernel32, "CreateHardLinkA");
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44 }
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45 initialized = TRUE;
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46 }
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47
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48 int
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49 link (const char *path1, const char *path2)
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50 {
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51 if (!initialized)
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52 initialize ();
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53 if (CreateHardLinkFunc == NULL)
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54 {
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55 /* System does not support hard links. */
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56 errno = EPERM;
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57 return -1;
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58 }
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59 if (CreateHardLinkFunc (path2, path1, NULL) == 0)
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60 {
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61 /* It is not documented which errors CreateHardLink() can produce.
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62 * The following conversions are based on tests on a Windows XP SP2
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63 * system. */
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64 DWORD err = GetLastError ();
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65 switch (err)
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66 {
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67 case ERROR_ACCESS_DENIED:
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68 errno = EACCES;
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69 break;
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70
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71 case ERROR_INVALID_FUNCTION: /* fs does not support hard links */
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72 errno = EPERM;
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73 break;
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74
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75 case ERROR_NOT_SAME_DEVICE:
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76 errno = EXDEV;
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77 break;
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78
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79 case ERROR_PATH_NOT_FOUND:
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80 case ERROR_FILE_NOT_FOUND:
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81 errno = ENOENT;
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82 break;
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83
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84 case ERROR_INVALID_PARAMETER:
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85 errno = ENAMETOOLONG;
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86 break;
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87
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88 case ERROR_TOO_MANY_LINKS:
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89 errno = EMLINK;
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90 break;
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91
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92 case ERROR_ALREADY_EXISTS:
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93 errno = EEXIST;
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94 break;
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95
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96 default:
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97 errno = EIO;
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98 }
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99 return -1;
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100 }
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101
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102 return 0;
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103 }
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104
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105 #else /* !Windows */
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106
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107 #error "This platform lacks a link function, and Gnulib doesn't provide a replacement. This is a bug in Gnulib."
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108
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109 #endif /* !Windows */