[PATCH 1/2] app/dumpcap: handle SIGTERM and SIGHUP

[Stephen Hemminger <stephen@networkplumber.org>]

If application is killed (SIGTERM), or the console session
ends (SIGHUP) or the write to the output file fails (SIGPIPE)
then do cleanup before exiting.

This also makes DPDK dumpcap behave more like Wireshark dumpcap.

Suggested-by: Isaac Boukris <iboukris@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 app/dumpcap/main.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/app/dumpcap/main.c b/app/dumpcap/main.c
index d57db0589a3f..76c747511444 100644
--- a/app/dumpcap/main.c
+++ b/app/dumpcap/main.c
@@ -939,6 +939,11 @@ int main(int argc, char **argv)
 {
 	struct rte_ring *r;
 	struct rte_mempool *mp;
+	struct sigaction action = {
+		.sa_flags = SA_RESTART,
+		.sa_handler = signal_handler,
+	};
+	struct sigaction origaction;
 	dumpcap_out_t out;
 	char *p;
 
@@ -964,8 +969,13 @@ int main(int argc, char **argv)
 
 	compile_filters();
 
-	signal(SIGINT, signal_handler);
-	signal(SIGPIPE, SIG_IGN);
+	sigemptyset(&action.sa_mask);
+	sigaction(SIGTERM, &action, NULL);
+	sigaction(SIGINT, &action, NULL);
+	sigaction(SIGPIPE, &action, NULL);
+	sigaction(SIGHUP, NULL, &origaction);
+	if (origaction.sa_handler == SIG_DFL)
+		sigaction(SIGHUP, &action, NULL);
 
 	enable_primary_monitor();
 
-- 
2.43.0