From: David van Moolenbroek <david@minix3.org>
Date: Sat, 22 Oct 2016 11:46:28 +0000 (+0000)
Subject: PM: fix alarm signal delivery
X-Git-Url: http://zhaoyanbai.com/repos/man.nsupdate.html?a=commitdiff_plain;h=286d266fd0c2c6853131c62e77f8edab8f6dc2bb;p=minix.git

PM: fix alarm signal delivery

As of change git-87c599d, when processing CLOCK notifications, PM no
longer set the current process pointer 'mp'.  That pointer is however
used when delivering signals through check_sig(), to see whether the
current process may deliver a signal to the target process.  As a
result, delivering SIGALARM signals used a previous pointer in these
checks, causing alarm signals not to be delivered in some cases.
This patch ensures that alarm signals are again delivered with PM as
current process.

Change-Id: I94ccbe8b71289df0e1d6d67928e55297bbc28360
---

diff --git a/minix/servers/pm/alarm.c b/minix/servers/pm/alarm.c
index e10f84dca..560a1b279 100644
--- a/minix/servers/pm/alarm.c
+++ b/minix/servers/pm/alarm.c
@@ -338,5 +338,7 @@ cause_sigalrm(int arg)
 	set_alarm(rmp, rmp->mp_interval[ITIMER_REAL]);
   else rmp->mp_flags &= ~ALARM_ON;
 
+  mp = &mproc[0];		/* pretend the signal comes from PM */
+
   check_sig(rmp->mp_pid, SIGALRM, FALSE /* ksig */);
 }