From 4e8b0938d90793d6e1e200d6b25e6581b72bd4d0 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 20 Jun 2012 22:16:47 -0400
Subject: proper error handling for fcntl F_GETOWN on modern kernels

on old kernels, there's no way to detect errors; we must assume
negative syscall return values are pgrp ids. but if the F_GETOWN_EX
fcntl works, we can get a reliable answer.
---
 include/fcntl.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'include/fcntl.h')

diff --git a/include/fcntl.h b/include/fcntl.h
index 36fb24bc..fcb622a2 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -99,6 +99,17 @@ int posix_fallocate(int, off_t, off_t);
 int lockf(int, int, off_t);
 #endif
 
+#if defined(_GNU_SOURCE)
+#define F_OWNER_TID 0
+#define F_OWNER_PID 1
+#define F_OWNER_PGRP 2
+#define F_OWNER_GID 2
+struct f_owner_ex {
+	int type;
+	pid_t pid;
+};
+#endif
+
 #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE)
 #define open64 open
 #define openat64 openat
-- 
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