At Wed, 30 May 2007 18:08:55 -0700 (PDT),
Roland McGrath wrote:
>
> Aside from typos, I think it should be more clearly and strongly worded.
>
> "These should never be seen by user programs. To return one of these
> 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."
Thanks, is that better?
Satoru
---
Add comment for errnos related to restart syscall to avoid the leakage of
them to user programs.
Signed-off-by: Satoru Takeuchi <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Roland McGrath <[email protected]>
Index: linux-2.6.22-rc3/include/linux/errno.h
===================================================================
--- linux-2.6.22-rc3.orig/include/linux/errno.h 2007-04-26 12:08:32.000000000 +0900
+++ linux-2.6.22-rc3/include/linux/errno.h 2007-05-31 10:47:40.000000000 +0900
@@ -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.. */
-
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