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-rw-r--r--linux-user/errno_defs.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/linux-user/errno_defs.h b/linux-user/errno_defs.h
index 8a1cf76cdb..b7a8c9ff95 100644
--- a/linux-user/errno_defs.h
+++ b/linux-user/errno_defs.h
@@ -139,3 +139,11 @@
 /* for robust mutexes */
 #define TARGET_EOWNERDEAD      130     /* Owner died */
 #define TARGET_ENOTRECOVERABLE 131     /* State not recoverable */
+
+/* QEMU internal, not visible to the guest. This is returned when a
+ * system call should be restarted, to tell the main loop that it
+ * should wind the guest PC backwards so it will re-execute the syscall
+ * after handling any pending signals. They match with the ones the guest
+ * kernel uses for the same purpose.
+ */
+#define TARGET_ERESTARTSYS     512     /* Restart system call (if SA_RESTART) */