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Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c30
1 files changed, 18 insertions, 12 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 167e1e3ad7c6..0c06b9efae3b 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1417,6 +1417,18 @@ static int wait_task_zombie(struct task_struct *p, int options,
return retval;
}
+static int *task_stopped_code(struct task_struct *p, bool ptrace)
+{
+ if (ptrace) {
+ if (task_is_stopped_or_traced(p))
+ return &p->exit_code;
+ } else {
+ if (p->signal->flags & SIGNAL_STOP_STOPPED)
+ return &p->signal->group_exit_code;
+ }
+ return NULL;
+}
+
/*
* Handle sys_wait4 work for one task in state TASK_STOPPED. We hold
* read_lock(&tasklist_lock) on entry. If we return zero, we still hold
@@ -1427,7 +1439,7 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
int options, struct siginfo __user *infop,
int __user *stat_addr, struct rusage __user *ru)
{
- int retval, exit_code, why;
+ int retval, exit_code, *p_code, why;
uid_t uid = 0; /* unneeded, required by compiler */
pid_t pid;
@@ -1437,22 +1449,16 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
exit_code = 0;
spin_lock_irq(&p->sighand->siglock);
- if (unlikely(!task_is_stopped_or_traced(p)))
- goto unlock_sig;
-
- if (!ptrace && p->signal->group_stop_count > 0)
- /*
- * A group stop is in progress and this is the group leader.
- * We won't report until all threads have stopped.
- */
+ p_code = task_stopped_code(p, ptrace);
+ if (unlikely(!p_code))
goto unlock_sig;
- exit_code = p->exit_code;
+ exit_code = *p_code;
if (!exit_code)
goto unlock_sig;
if (!unlikely(options & WNOWAIT))
- p->exit_code = 0;
+ *p_code = 0;
/* don't need the RCU readlock here as we're holding a spinlock */
uid = __task_cred(p)->uid;
@@ -1608,7 +1614,7 @@ static int wait_consider_task(struct task_struct *parent, int ptrace,
*/
*notask_error = 0;
- if (task_is_stopped_or_traced(p))
+ if (task_stopped_code(p, ptrace))
return wait_task_stopped(ptrace, p, options,
infop, stat_addr, ru);