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authorOleg Nesterov <oleg@redhat.com>2011-04-27 21:44:14 +0200
committerOleg Nesterov <oleg@redhat.com>2011-04-28 13:01:38 +0200
commit943df1485a8ff0e600729e082e568ece04d4de9e (patch)
treed2d4b7b41f163e011cb7a373376c9ae87e5941be /kernel/signal.c
parentfe0faa005d43bc44c357631d51c273806086caa4 (diff)
signal: introduce do_sigtimedwait() to factor out compat/native code
Factor out the common code in sys_rt_sigtimedwait/compat_sys_rt_sigtimedwait to the new helper, do_sigtimedwait(). Add the comment to document the extra tick we add to timespec_to_jiffies(ts), thanks to Linus who explained this to me. Perhaps it would be better to move compat_sys_rt_sigtimedwait() into signal.c under CONFIG_COMPAT, then we can make do_sigtimedwait() static. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Tejun Heo <tj@kernel.org> Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com>
Diffstat (limited to 'kernel/signal.c')
-rw-r--r--kernel/signal.c110
1 files changed, 65 insertions, 45 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index c734619554f..1ab89f67742 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2504,6 +2504,66 @@ int copy_siginfo_to_user(siginfo_t __user *to, siginfo_t *from)
#endif
/**
+ * do_sigtimedwait - wait for queued signals specified in @which
+ * @which: queued signals to wait for
+ * @info: if non-null, the signal's siginfo is returned here
+ * @ts: upper bound on process time suspension
+ */
+int do_sigtimedwait(const sigset_t *which, siginfo_t *info,
+ const struct timespec *ts)
+{
+ struct task_struct *tsk = current;
+ long timeout = MAX_SCHEDULE_TIMEOUT;
+ sigset_t mask = *which;
+ int sig;
+
+ if (ts) {
+ if (!timespec_valid(ts))
+ return -EINVAL;
+ timeout = timespec_to_jiffies(ts);
+ /*
+ * We can be close to the next tick, add another one
+ * to ensure we will wait at least the time asked for.
+ */
+ if (ts->tv_sec || ts->tv_nsec)
+ timeout++;
+ }
+
+ /*
+ * Invert the set of allowed signals to get those we want to block.
+ */
+ sigdelsetmask(&mask, sigmask(SIGKILL) | sigmask(SIGSTOP));
+ signotset(&mask);
+
+ spin_lock_irq(&tsk->sighand->siglock);
+ sig = dequeue_signal(tsk, &mask, info);
+ if (!sig && timeout) {
+ /*
+ * None ready, temporarily unblock those we're interested
+ * while we are sleeping in so that we'll be awakened when
+ * they arrive.
+ */
+ tsk->real_blocked = tsk->blocked;
+ sigandsets(&tsk->blocked, &tsk->blocked, &mask);
+ recalc_sigpending();
+ spin_unlock_irq(&tsk->sighand->siglock);
+
+ timeout = schedule_timeout_interruptible(timeout);
+
+ spin_lock_irq(&tsk->sighand->siglock);
+ sig = dequeue_signal(tsk, &mask, info);
+ tsk->blocked = tsk->real_blocked;
+ siginitset(&tsk->real_blocked, 0);
+ recalc_sigpending();
+ }
+ spin_unlock_irq(&tsk->sighand->siglock);
+
+ if (sig)
+ return sig;
+ return timeout ? -EINTR : -EAGAIN;
+}
+
+/**
* sys_rt_sigtimedwait - synchronously wait for queued signals specified
* in @uthese
* @uthese: queued signals to wait for
@@ -2515,11 +2575,10 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
siginfo_t __user *, uinfo, const struct timespec __user *, uts,
size_t, sigsetsize)
{
- int ret, sig;
sigset_t these;
struct timespec ts;
siginfo_t info;
- long timeout;
+ int ret;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(sigset_t))
@@ -2528,55 +2587,16 @@ SYSCALL_DEFINE4(rt_sigtimedwait, const sigset_t __user *, uthese,
if (copy_from_user(&these, uthese, sizeof(these)))
return -EFAULT;
- /*
- * Invert the set of allowed signals to get those we
- * want to block.
- */
- sigdelsetmask(&these, sigmask(SIGKILL)|sigmask(SIGSTOP));
- signotset(&these);
-
- timeout = MAX_SCHEDULE_TIMEOUT;
if (uts) {
if (copy_from_user(&ts, uts, sizeof(ts)))
return -EFAULT;
- if (!timespec_valid(&ts))
- return -EINVAL;
- timeout = timespec_to_jiffies(&ts) + (ts.tv_sec || ts.tv_nsec);
}
- spin_lock_irq(&current->sighand->siglock);
- sig = dequeue_signal(current, &these, &info);
- if (!sig && timeout) {
- /*
- * None ready -- temporarily unblock those we're
- * interested while we are sleeping in so that we'll
- * be awakened when they arrive.
- */
- current->real_blocked = current->blocked;
- sigandsets(&current->blocked, &current->blocked, &these);
- recalc_sigpending();
- spin_unlock_irq(&current->sighand->siglock);
-
- timeout = schedule_timeout_interruptible(timeout);
-
- spin_lock_irq(&current->sighand->siglock);
- sig = dequeue_signal(current, &these, &info);
- current->blocked = current->real_blocked;
- siginitset(&current->real_blocked, 0);
- recalc_sigpending();
- }
- spin_unlock_irq(&current->sighand->siglock);
+ ret = do_sigtimedwait(&these, &info, uts ? &ts : NULL);
- if (sig) {
- ret = sig;
- if (uinfo) {
- if (copy_siginfo_to_user(uinfo, &info))
- ret = -EFAULT;
- }
- } else {
- ret = -EAGAIN;
- if (timeout)
- ret = -EINTR;
+ if (ret > 0 && uinfo) {
+ if (copy_siginfo_to_user(uinfo, &info))
+ ret = -EFAULT;
}
return ret;