!9 backport ppswatch: Fix quitting after signal

From: @liyy9 
Reviewed-by: @Charlie_li 
Signed-off-by: @Charlie_li

0001-ppswatch-Fix-quitting-after-signal.patch

@@ -0,0 +1,79 @@
+From 6deb88a80529f76a1ff1bdc9f1d0eb15c46c87e4 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Konrad=20Gr=C3=A4fe?= <konradgraefe@aol.com>
+Date: Fri, 10 Aug 2018 09:47:33 +0200
+Subject: [PATCH] ppswatch: Fix quitting after signal
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The ppswatch quitting mechanism relies on time_pps_fetch() being
+interrupted by a signal. Therefore when ppswatch receives a signal while
+it's not within time_pps_fetch() it would print the stastics but not
+quit the application.
+
+I can reliably reproduce the issue on my embedded machine (using the
+pps-gpio driver) by running the following snippet:
+    ./ppswatch -a /dev/pps3 &
+    pid=$!
+    sleep 3
+    kill $pid
+
+This patch fixes the issue.
+
+Signed-off-by: Konrad Gräfe <konradgraefe@aol.com>
+---
+ ppswatch.c | 10 +++++++---
+ 1 file changed, 7 insertions(+), 3 deletions(-)
+
+diff --git a/ppswatch.c b/ppswatch.c
+index eb0500c..5c6202b 100644
+--- a/ppswatch.c
++++ b/ppswatch.c
+@@ -14,6 +14,7 @@
+  *   GNU General Public License for more details.
+  */
+ 
++#include <stdbool.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <unistd.h>
+@@ -39,6 +40,8 @@ static int max_divergence = 0;
+ static double mean = 0.0;
+ static double M2 = 0.0;
+ 
++static volatile bool quit = false;
++
+ int find_source(char *path, pps_handle_t *handle, int *avail_mode)
+ {
+ 	pps_params_t params;
+@@ -112,8 +115,8 @@ int fetch_source(pps_handle_t handle, int avail_mode)
+ 		ret = time_pps_fetch(handle, PPS_TSFMT_TSPEC, &infobuf,
+ 				   &timeout);
+ 	}
+-	if (ret < 0) {
+-		if (errno == EINTR) {
++	if (ret < 0 || quit) {
++		if (errno == EINTR || quit) {
+ 			return -1;
+ 		}
+ 
+@@ -244,6 +247,7 @@ void print_stats()
+ 
+ static void sighandler_exit(int signum) {
+ 	print_stats();
++	quit = true;
+ }
+ 
+ int main(int argc, char *argv[])
+@@ -272,7 +276,7 @@ int main(int argc, char *argv[])
+ 	/* loop, printing the most recent timestamp every second or so */
+ 	while (1) {
+ 		ret = fetch_source(handle, avail_mode);
+-		if (ret < 0 && errno == EINTR) {
++		if ((ret < 0 && errno == EINTR) || quit) {
+ 			ret = 0;
+ 			break;
+ 		}
+-- 
+2.33.0
+

pps-tools.spec

@@ -1,11 +1,13 @@
 Name:             pps-tools
 Version:          1.0.2
-Release:          3
+Release:          4
 Summary:          User-space tools for LinuxPPS
 License:          GPLv2+
 URL:              https://github.com/redlab-i/pps-tools
 Source0:          https://github.com/redlab-i/pps-tools/archive/v%{version}/%{name}-%{version}.tar.gz
 
+Patch0001:        0001-ppswatch-Fix-quitting-after-signal.patch
+
 BuildRequires:    gcc
 
 %description
@@ -43,6 +45,9 @@ install -p -m644 -t $RPM_BUILD_ROOT%{_includedir}/sys timepps.h
 %{_includedir}/sys/timepps.h
 
 %changelog
+* Thu Oct 12 2023 liyuanyuan <liyuanyuan@xfusion.com> - 1.0.2-4
+- ppswatch: Fix quitting after signal
+
 * Mon Dec 9 2019 openEuler Buildteam <buildteam@openeuler.org> - 1.0.2-3
 - Package init