MinGW: a hardlink implementation

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/compat/mingw.c b/compat/mingw.c
index f66ad56aae969e93643915db8fd6272f5f662975..171fa85e4ae9fa026bbb72e2e8b8b098d2ba22ed 100644 (file)
--- 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 6e246864429e276f116761e64bf89eb6e036fc28..7e52f3607f82d58141086b627c2e7167f2c05323 100644 (file)
--- 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