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authorSatoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>2007-06-01 00:47:06 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-01 08:18:29 -0700
commit62e5b05db6cd5dd9cf9614cc5d2d0702c1e339bb (patch)
treebd1800cc229a196cb36c90db8432577f5421c060
parentd7083174a2ca5ff80de773d2054caee2f77bf9f9 (diff)
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 <takeuchi_satoru@jp.fujitsu.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-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 d90b80f9b28c..46685832ed99 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.. */