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tracehook: tracehook_consider_fatal_signal

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This defines tracehook_consider_fatal_signal() has a fine-grained hook for
deciding to skip the special cases for a fatal signal, as ptrace does.
There is no change, only cleanup.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roland McGrath 2008-07-25 19:45:52 -07:00 • committed by Linus Torvalds
parent 35de254dc6
commit 445a91d2fe
2 changed files with 26 additions and 4 deletions
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21
include/linux/tracehook.h
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@ -331,4 +331,25 @@ static inline int tracehook_consider_ignored_signal(struct task_struct *task,
return (task_ptrace(task) & PT_PTRACED) != 0;
}
/**
* tracehook_consider_fatal_signal - suppress special handling of fatal signal
* @task: task receiving the signal
* @sig: signal number being sent
* @handler: %SIG_DFL or %SIG_IGN
*
* Return nonzero to prevent special handling of this termination signal.
* Normally @handler is %SIG_DFL. It can be %SIG_IGN if @sig is ignored,
* in which case force_sig() is about to reset it to %SIG_DFL.
* When this returns zero, this signal might cause a quick termination
* that does not give the debugger a chance to intercept the signal.
*
* Called with or without @task->sighand->siglock held.
*/
static inline int tracehook_consider_fatal_signal(struct task_struct *task,
int sig,
void __user *handler)
{
return (task_ptrace(task) & PT_PTRACED) != 0;
}
#endif /* <linux/tracehook.h> */