win32: add link()

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>

2 files changed, 22 insertions, 1 deletions

diff --git a/include/mingw.h b/include/mingw.h
index c26e16bc7..963a87104 100644
--- a/include/mingw.h
+++ b/include/mingw.h
@@ -258,7 +258,7 @@ NOIMPL(fcntl,int fd UNUSED_PARAM, int cmd UNUSED_PARAM, ...);
 #define fork() -1
 IMPL(fsync,int,0,int fd UNUSED_PARAM);
 NOIMPL(kill,pid_t pid UNUSED_PARAM, int sig UNUSED_PARAM);
-NOIMPL(link,const char *oldpath UNUSED_PARAM, const char *newpath UNUSED_PARAM);
+int link(const char *oldpath, const char *newpath);
 NOIMPL(mknod,const char *name UNUSED_PARAM, mode_t mode UNUSED_PARAM, dev_t device UNUSED_PARAM);
 int pipe(int filedes[2]);
 NOIMPL(readlink,const char *path UNUSED_PARAM, char *buf UNUSED_PARAM, size_t bufsiz UNUSED_PARAM);
diff --git a/win32/mingw.c b/win32/mingw.c
index afd017e87..eccd37cc3 100644
--- a/win32/mingw.c
+++ b/win32/mingw.c
@@ -327,3 +327,24 @@ sighandler_t mingw_signal(int sig, sighandler_t handler)
         timer_fn = handler;
         return old;
 }
+
+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;
+}