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| author | Roland McGrath <roland@redhat.com> | 2008-07-25 19:45:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-26 12:00:09 -0700 |
| commit | 35de254dc60f91004b3b5ebb1fc7b2c3093d6032 (patch) | |
| tree | 101e174247bb3174c8abe0fb8d1405ed6a4db6d1 /include | |
| parent | c45aea27617d6a1e0aacddc3b0233f704222fcbd (diff) | |
| download | op-kernel-dev-35de254dc60f91004b3b5ebb1fc7b2c3093d6032.zip op-kernel-dev-35de254dc60f91004b3b5ebb1fc7b2c3093d6032.tar.gz | |
tracehook: tracehook_consider_ignored_signal
This defines tracehook_consider_ignored_signal() has a fine-grained hook
for deciding to prevent the normal short-circuit of sending an ignored
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tracehook.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h index 2d1426f..8cffd34 100644 --- a/include/linux/tracehook.h +++ b/include/linux/tracehook.h @@ -312,4 +312,23 @@ static inline void tracehook_signal_handler(int sig, siginfo_t *info, ptrace_notify(SIGTRAP); } +/** + * tracehook_consider_ignored_signal - suppress short-circuit of ignored signal + * @task: task receiving the signal + * @sig: signal number being sent + * @handler: %SIG_IGN or %SIG_DFL + * + * Return zero iff tracing doesn't care to examine this ignored signal, + * so it can short-circuit normal delivery and never even get queued. + * Either @handler is %SIG_DFL and @sig's default is ignore, or it's %SIG_IGN. + * + * Called with @task->sighand->siglock held. + */ +static inline int tracehook_consider_ignored_signal(struct task_struct *task, + int sig, + void __user *handler) +{ + return (task_ptrace(task) & PT_PTRACED) != 0; +} + #endif /* <linux/tracehook.h> */ |
