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authorRoland McGrath <roland@redhat.com>2008-04-18 05:44:38 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-18 19:17:57 +0400
commit18c98b65279c00c3c983a4525161207f1aa6a04b (patch)
tree21ddeaf029407a08a81843bf35aeb338b2d67dd7
parent0e04388f0189fa1f6812a8e1cb6172136eada87e (diff)
downloadlinux-18c98b65279c00c3c983a4525161207f1aa6a04b.tar.xz
ptrace_signal subroutine
This breaks out the ptrace handling from get_signal_to_deliver into a new subroutine. The actual code there doesn't change, and it gets inlined into nearly identical compiled code. This makes the function substantially shorter and thus easier to read, and it nicely isolates the ptrace magic. Signed-off-by: Roland McGrath <roland@redhat.com> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/signal.c71
1 files changed, 42 insertions, 29 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index 6af1210092c3..cc8303cd093d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1757,6 +1757,45 @@ static int do_signal_stop(int signr)
return 1;
}
+static int ptrace_signal(int signr, siginfo_t *info,
+ struct pt_regs *regs, void *cookie)
+{
+ if (!(current->ptrace & PT_PTRACED))
+ return signr;
+
+ ptrace_signal_deliver(regs, cookie);
+
+ /* Let the debugger run. */
+ ptrace_stop(signr, 0, info);
+
+ /* We're back. Did the debugger cancel the sig? */
+ signr = current->exit_code;
+ if (signr == 0)
+ return signr;
+
+ current->exit_code = 0;
+
+ /* Update the siginfo structure if the signal has
+ changed. If the debugger wanted something
+ specific in the siginfo structure then it should
+ have updated *info via PTRACE_SETSIGINFO. */
+ if (signr != info->si_signo) {
+ info->si_signo = signr;
+ info->si_errno = 0;
+ info->si_code = SI_USER;
+ info->si_pid = task_pid_vnr(current->parent);
+ info->si_uid = current->parent->uid;
+ }
+
+ /* If the (new) signal is now blocked, requeue it. */
+ if (sigismember(&current->blocked, signr)) {
+ specific_send_sig_info(signr, info, current);
+ signr = 0;
+ }
+
+ return signr;
+}
+
int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
struct pt_regs *regs, void *cookie)
{
@@ -1785,36 +1824,10 @@ relock:
if (!signr)
break; /* will return 0 */
- if ((current->ptrace & PT_PTRACED) && signr != SIGKILL) {
- ptrace_signal_deliver(regs, cookie);
-
- /* Let the debugger run. */
- ptrace_stop(signr, 0, info);
-
- /* We're back. Did the debugger cancel the sig? */
- signr = current->exit_code;
- if (signr == 0)
- continue;
-
- current->exit_code = 0;
-
- /* Update the siginfo structure if the signal has
- changed. If the debugger wanted something
- specific in the siginfo structure then it should
- have updated *info via PTRACE_SETSIGINFO. */
- if (signr != info->si_signo) {
- info->si_signo = signr;
- info->si_errno = 0;
- info->si_code = SI_USER;
- info->si_pid = task_pid_vnr(current->parent);
- info->si_uid = current->parent->uid;
- }
-
- /* If the (new) signal is now blocked, requeue it. */
- if (sigismember(&current->blocked, signr)) {
- specific_send_sig_info(signr, info, current);
+ if (signr != SIGKILL) {
+ signr = ptrace_signal(signr, info, regs, cookie);
+ if (!signr)
continue;
- }
}
ka = &current->sighand->action[signr-1];