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-rw-r--r--include/qapi/error.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/qapi/error.h b/include/qapi/error.h
index 0576659603..7e532d00e9 100644
--- a/include/qapi/error.h
+++ b/include/qapi/error.h
@@ -170,6 +170,9 @@ void error_setg_internal(Error **errp,
* Just like error_setg(), with @os_error info added to the message.
* If @os_error is non-zero, ": " + strerror(os_error) is appended to
* the human-readable error message.
+ *
+ * The value of errno (which usually can get clobbered by almost any
+ * function call) will be preserved.
*/
#define error_setg_errno(errp, os_error, fmt, ...) \
error_setg_errno_internal((errp), __FILE__, __LINE__, __func__, \