Commit:     62e5b05db6cd5dd9cf9614cc5d2d0702c1e339bb
Parent:     d7083174a2ca5ff80de773d2054caee2f77bf9f9
Author:     Satoru Takeuchi <[EMAIL PROTECTED]>
AuthorDate: Fri Jun 1 00:47:06 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Jun 1 08:18:29 2007 -0700

    Better documentation for ERESTARTSYS
    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]>
    Acked-by: Roland McGrath <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 include/linux/errno.h |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/include/linux/errno.h b/include/linux/errno.h
index d90b80f..4668583 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 ERESTARTNOHAND 514     /* restart if no handler.. */
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