Hello Martin,
Your patch did a '#define _WIN32_WINNT 0x0500' in order to access the
CreateHardLink() function. This means, this function did not exist on
Windows NT 4.
Unfortunately, my mingw test system is running in a Windows NT 4 SP5
machine; this is the only version of Windows that I can use without
paying bucks to Microsoft. And on this system, the 'test-link.exe'
exits with exit code 128 - not 0, 1, or 77. It's a failure in the
runtime linking, and would affect any executable that includes the
compiled link.c code.
In general I am not in favour of supporting systems more than 8 years
old. But since this is the only Windows machine I have access to, after
the shutdown of testdrive...
With the attached patch, I can link and run test-link.exe, and it
exits with code 77 - as expected for a platform that does not support
hard links.
Transforming code that works for Windows 2000 or newer into code
that works also for older versions is tedious but straightforward:
- Look up the types of the functions,
- Look up the decorated names of the functions, and the DLLs where
they come from,
- Use LoadLibrary and GetProcAddress to get the function pointers.
2009-01-20 Bruno Haible <br...@clisp.org>
Make the 'link' module link on Windows NT 4.
* lib/link.c (_WIN32_WINNT): Don't define.
(CreateHardLinkFuncType): New type.
(CreateHardLinkFunc, initialized): New variables.
(initialize): New function.
(link): Invoke CreateHardLink indirectly through the function pointer.
*** lib/link.c.orig 2009-01-21 00:34:52.000000000 +0100
--- lib/link.c 2009-01-21 00:34:24.000000000 +0100
***************
*** 21,36 ****
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
#define WIN32_LEAN_AND_MEAN
- #define _WIN32_WINNT 0x0500
#include <unistd.h>
#include <windows.h>
#include <errno.h>
int
link (const char *path1, const char *path2)
{
! if (CreateHardLink (path2, path1, NULL) == 0)
{
/* It is not documented which errors CreateHardLink() can produce.
* The following conversions are based on tests on a Windows XP SP2
--- 21,62 ----
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
#define WIN32_LEAN_AND_MEAN
#include <unistd.h>
#include <windows.h>
#include <errno.h>
+ /* CreateHardLink was introduced only in Windows 2000. */
+ typedef BOOL (WINAPI * CreateHardLinkFuncType) (LPCTSTR lpFileName,
+ LPCTSTR lpExistingFileName,
+ LPSECURITY_ATTRIBUTES
lpSecurityAttributes);
+ static CreateHardLinkFuncType CreateHardLinkFunc = NULL;
+ static BOOL initialized = FALSE;
+
+ static void
+ initialize (void)
+ {
+ HMODULE kernel32 = LoadLibrary ("kernel32.dll");
+ if (kernel32 != NULL)
+ {
+ CreateHardLinkFunc =
+ (CreateHardLinkFuncType) GetProcAddress (kernel32, "CreateHardLinkA");
+ }
+ initialized = TRUE;
+ }
+
int
link (const char *path1, const char *path2)
{
! if (!initialized)
! initialize ();
! if (CreateHardLinkFunc == NULL)
! {
! /* System does not support hard links. */
! errno = EPERM;
! return -1;
! }
! if (CreateHardLinkFunc (path2, path1, NULL) == 0)
{
/* It is not documented which errors CreateHardLink() can produce.
* The following conversions are based on tests on a Windows XP SP2
