[Xen-devel] [PATCH XEN v3 20/22] tools/libs/foreignmemory: Mention restrictions on fork in docs.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/libs/foreignmemory/include/xenforeignmemory.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/libs/foreignmemory/include/xenforeignmemory.h 
b/tools/libs/foreignmemory/include/xenforeignmemory.h
index 1bcdf6a..5897fb8 100644
--- a/tools/libs/foreignmemory/include/xenforeignmemory.h
+++ b/tools/libs/foreignmemory/include/xenforeignmemory.h
@@ -32,7 +32,12 @@ typedef struct xentoollog_logger xentoollog_logger;
 typedef struct xenforeignmemory_handle xenforeignmemory_handle;
 
 /*
- * Return a handle onto the hypercall driver.  Logs errors.
+ * Return a handle onto the foreign memory mapping driver.  Logs errors.
+ *
+ * Note: After fork a child process must not use any opened handle
+ * inherited from their parent. Any existing mappings should be
+ * assumed to become invalid. Therefore children must open a new
+ * handle and make new mappings if necessary.
  */
 xenforeignmemory_handle *xenforeignmemory_open(xentoollog_logger *logger,
                                                unsigned open_flags);
-- 
2.1.4


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