macro: introduce steal_fd()

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

macro: introduce steal_fd()
4c5a103a · Christian Brauner · d9c4e404 · 4c5a103a
Unverified Commit 4c5a103a authored Feb 17, 2019 by Christian Brauner
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macro.h src/lxc/macro.h +7 -0

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--- a/src/lxc/macro.h
+++ b/src/lxc/macro.h
@@ -407,4 +407,11 @@ enum {
 		__internal_fd__;            \
 	})

+#define steal_fd(fd)             \
+	({                       \
+		int _fd_ = (fd); \
+		(fd) = -EBADF;   \
+		_fd_;            \
+	})
+
 #endif /* __LXC_MACRO_H */