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From 37725f3e22edb50e0ca2d1fff971321a5a4d5112 Mon Sep 17 00:00:00 2001
From: Hongxu Jia <hongxu.jia@windriver.com>
Date: Wed, 12 Jul 2017 03:05:13 -0400
Subject: [PATCH 11/11] Moved the call to isc_app_ctxstart() to not get signal
block by all threads
Signed-off-by: Francis Dupont <fdupont@isc.org>
In https://source.isc.org/git/bind9.git, since the following
commit applied:
...
commit b99bfa184bc9375421b5df915eea7dfac6a68a99
Author: Evan Hunt <each@isc.org>
Date: Wed Apr 10 13:49:57 2013 -0700
[master] unify internal and export libraries
3550. [func] Unified the internal and export versions of the
BIND libraries, allowing external clients to use
the same libraries as BIND. [RT #33131]
...
(git show b99bfa184bc9375421b5df915eea7dfac6a68a99 -- ./lib/isc/unix/app.c)
In this commit, if bind9 enable threads(ISC_PLATFORM_USETHREADS),
it blocks signal SIGHUP, SIGINT and SIGTERM in isc__app_ctxstart.
Which caused dhclient/dhcpd could not be stopped by SIGTERM.
It caused systemd's reboot hung which send SIGTERM by default.
Upstream-Status: Backport [https://source.isc.org/git/dhcp.git]
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
omapip/isclib.c | 25 +++++++++++++++----------
1 file changed, 15 insertions(+), 10 deletions(-)
diff --git a/omapip/isclib.c b/omapip/isclib.c
index ce86490..6a04345 100644
--- a/omapip/isclib.c
+++ b/omapip/isclib.c
@@ -185,16 +185,6 @@ dhcp_context_create(int flags,
if (result != ISC_R_SUCCESS)
goto cleanup;
- result = isc_app_ctxstart(dhcp_gbl_ctx.actx);
- if (result != ISC_R_SUCCESS)
- return (result);
- dhcp_gbl_ctx.actx_started = ISC_TRUE;
-
- /* Not all OSs support suppressing SIGPIPE through socket
- * options, so set the sigal action to be ignore. This allows
- * broken connections to fail gracefully with EPIPE on writes */
- handle_signal(SIGPIPE, SIG_IGN);
-
result = isc_taskmgr_createinctx(dhcp_gbl_ctx.mctx,
dhcp_gbl_ctx.actx,
1, 0,
@@ -217,6 +207,21 @@ dhcp_context_create(int flags,
result = isc_task_create(dhcp_gbl_ctx.taskmgr, 0, &dhcp_gbl_ctx.task);
if (result != ISC_R_SUCCESS)
goto cleanup;
+
+ result = isc_app_ctxstart(dhcp_gbl_ctx.actx);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+ dhcp_gbl_ctx.actx_started = ISC_TRUE;
+
+ /* Not all OSs support suppressing SIGPIPE through socket
+ * options, so set the sigal action to be ignore. This allows
+ * broken connections to fail gracefully with EPIPE on writes */
+ handle_signal(SIGPIPE, SIG_IGN);
+
+ /* Reset handlers installed by isc_app_ctxstart()
+ * to default for control-c and kill */
+ handle_signal(SIGINT, SIG_DFL);
+ handle_signal(SIGTERM, SIG_DFL);
}
#if defined (NSUPDATE)
--
1.8.3.1
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