[PATCH 2/2] MinGW: a hardlink implementation

[Johannes Sixt <j6t@kdbg.org>]

From: Petr Kodl <petrkodl@gmail.com>
Date: Sat, 24 Jan 2009 15:04:39 +0100

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Johannes Sixt <j6t@kdbg.org>
---
  This is the meat of Petr's original patch with the fixup that was
  discussed in the msysgit mailing list (WINAPI was added in the
  typedef).

  -- Hannes

  compat/mingw.c |   21 +++++++++++++++++++++
  compat/mingw.h |    3 +--
  2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index f66ad56..171fa85 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1118,3 +1118,24 @@ void mingw_open_html(const char *unixpath)
  	printf("Launching default browser to display HTML ...\n");
  	ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
  }
+
+int link(const char *oldpath, const char *newpath)
+{
+	typedef BOOL WINAPI (*T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
+	static T create_hard_link = NULL;
+	if (!create_hard_link) {
+		create_hard_link = (T) GetProcAddress(
+			GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
+		if (!create_hard_link)
+			create_hard_link = (T)-1;
+	}
+	if (create_hard_link == (T)-1) {
+		errno = ENOSYS;
+		return -1;
+	}
+	if (!create_hard_link(newpath, oldpath, NULL)) {
+		errno = err_win_to_posix(GetLastError());
+		return -1;
+	}
+	return 0;
+}
diff --git a/compat/mingw.h b/compat/mingw.h
index f5da647..762eb14 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -67,8 +67,6 @@ static inline int readlink(const char *path, char *buf, size_t bufsiz)
  { errno = ENOSYS; return -1; }
  static inline int symlink(const char *oldpath, const char *newpath)
  { errno = ENOSYS; return -1; }
-static inline int link(const char *oldpath, const char *newpath)
-{ errno = ENOSYS; return -1; }
  static inline int fchmod(int fildes, mode_t mode)
  { errno = ENOSYS; return -1; }
  static inline int fork(void)
@@ -134,6 +132,7 @@ int getpagesize(void);	/* defined in MinGW's libgcc.a */
  struct passwd *getpwuid(int uid);
  int setitimer(int type, struct itimerval *in, struct itimerval *out);
  int sigaction(int sig, struct sigaction *in, struct sigaction *out);
+int link(const char *oldpath, const char *newpath);

  /*
   * replacements of existing functions
-- 
1.6.2.rc2.971.g14d5