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-rw-r--r--include/linux/errno.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/errno.h b/include/linux/errno.h
index d90b80f9b28..46685832ed9 100644
--- a/include/linux/errno.h
+++ b/include/linux/errno.h
@@ -5,7 +5,12 @@
#ifdef __KERNEL__
-/* Should never be seen by user programs */
+/*
+ * These should never be seen by user programs. To return one of ERESTART*
+ * codes, signal_pending() MUST be set. Note that ptrace can observe these
+ * at syscall exit tracing, but they will never be left for the debugged user
+ * process to see.
+ */
#define ERESTARTSYS 512
#define ERESTARTNOINTR 513
#define ERESTARTNOHAND 514 /* restart if no handler.. */