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Better documentation for ERESTARTSYS

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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>
This commit is contained in:
Satoru Takeuchi 2007-06-01 00:47:06 -07:00 committed by Linus Torvalds
parent d7083174a2
commit 62e5b05db6
1 changed files with 6 additions and 1 deletions
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7
include/linux/errno.h
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@ -5,7 +5,12 @@
#ifdef __KERNEL__ #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 ERESTARTSYS 512
#define ERESTARTNOINTR 513 #define ERESTARTNOINTR 513
#define ERESTARTNOHAND 514 /* restart if no handler.. */ #define ERESTARTNOHAND 514 /* restart if no handler.. */