dhcp/0015-Ignore-SIGPIPE-to-not-die-in-socket-code.patch

From d9b443ef38da92bd325f5118a2a6ddc21fae098e Mon Sep 17 00:00:00 2001
From: Marius Tomaschewski <mt@suse.de>
Date: Thu, 20 Dec 2012 10:25:53 +0100
Subject: [PATCH] Ignore SIGPIPE to not die in socket code

Installed SIG_IGN handler for SIGPIPE to not die before
the errno==EPIPE checks in the socket code are reached.
Unlike isc_app_start(), the isc_app_ctxstart() used by
dhcp, does not set any signal handlers.

Reported upstream as [ISC-Bugs #32222], IMO regression
to [ISC-Bugs #22269] as the SO_NOSIGPIPE socket option
isn't available e.g. on Linux.
---
 omapip/isclib.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/omapip/isclib.c b/omapip/isclib.c
index afab262..9b7ff5f 100644
--- a/omapip/isclib.c
+++ b/omapip/isclib.c
@@ -69,6 +69,23 @@ isclib_cleanup(void)
 	return;
 }
 
+static isc_result_t
+handle_signal(int sig, void (*handler)(int)) {
+	struct sigaction sa;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = handler;
+
+	if (sigfillset(&sa.sa_mask) != 0 ||
+	    sigaction(sig, &sa, NULL) < 0) {
+		log_error("handle_signal() %d setup: %s",
+				sig, strerror(errno));
+		return (ISC_R_UNEXPECTED);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
 isc_result_t
 dhcp_context_create(void) {
 	isc_result_t result;
@@ -106,7 +123,20 @@ dhcp_context_create(void) {
 
 	result = isc_app_ctxstart(dhcp_gbl_ctx.actx);
 	if (result != ISC_R_SUCCESS)
-		return (result);
+		goto cleanup;
+
+	/*
+	 * Always ignore SIGPIPE.
+	 * Otherwise we will die before the errno == EPIPE
+	 * checks in the socket code are reached.
+	 *
+	 * Note: unlike isc_app_start(), isc_app_ctxstart()
+	 *       does not set any signal handlers.
+	 */
+	result = handle_signal(SIGPIPE, SIG_IGN);
+	if (result != ISC_R_SUCCESS)
+		goto cleanup;
+
 	dhcp_gbl_ctx.actx_started = ISC_TRUE;
 
 	result = isc_taskmgr_createinctx(dhcp_gbl_ctx.mctx,
-- 
1.8.4