From fcdae0a1129886e78f1ed7933f8e300f6a4be9a8 Mon Sep 17 00:00:00 2001
From: Erik Faye-Lund <kusmabite@gmail.com>
Date: Mon, 23 Aug 2010 16:52:29 +0200
Subject: [PATCH] mingw: implement getppid

---
 compat/mingw.c | 32 ++++++++++++++++++++++++++++++++
 compat/mingw.h |  3 +--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/compat/mingw.c b/compat/mingw.c
index 9a8e336582..8fa561964a 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1431,6 +1431,38 @@ char *getpass(const char *prompt)
 	return strbuf_detach(&buf, NULL);
 }
 
+pid_t getppid(void)
+{
+	typedef ULONG (WINAPI *pfnNTQIP)(HANDLE, ULONG, PVOID, ULONG, PULONG);
+
+	static int first = 1;
+	static pfnNTQIP NtQueryInformationProcess;
+
+	if (first) {
+		first = 0;
+
+		NtQueryInformationProcess = (pfnNTQIP)GetProcAddress(
+		    GetModuleHandle("NTDLL.DLL"),
+		    "NtQueryInformationProcess");
+	}
+
+	if (NtQueryInformationProcess) {
+		struct {
+			long ExitStatus;
+			void* PebBaseAddress;
+			ULONG AffinityMask;
+			ULONG BasePriority;
+			ULONG UniqueProcessId;
+			ULONG ParentProcessId;
+		} pbi;
+		if (!NtQueryInformationProcess(GetCurrentProcess(),
+		    0, &pbi, sizeof(pbi), 0))
+			return pbi.ParentProcessId;
+	}
+
+	return 0;
+}
+
 #ifndef NO_MINGW_REPLACE_READDIR
 /* MinGW readdir implementation to avoid extra lstats for Git */
 struct mingw_DIR
diff --git a/compat/mingw.h b/compat/mingw.h
index 3b2477be5f..d79943099e 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -81,8 +81,7 @@ static inline unsigned int alarm(unsigned int seconds)
 { return 0; }
 static inline int fsync(int fd)
 { return _commit(fd); }
-static inline int getppid(void)
-{ return 1; }
+pid_t getppid(void);
 static inline void sync(void)
 {}
 static inline int getuid()
-- 
2.11.4.GIT