[PATCH 06/11] nfsdcld: Add graceful exit handling and resource cleanup

[Doug Nazar <nazard@xxxxxxxx>]

Signed-off-by: Doug Nazar <nazard@xxxxxxxx>
---
 utils/nfsdcld/nfsdcld.c | 32 ++++++++++++++++++++++++++++++--
 utils/nfsdcld/sqlite.c  | 15 +++++++++++++++
 utils/nfsdcld/sqlite.h  |  1 +
 3 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/utils/nfsdcld/nfsdcld.c b/utils/nfsdcld/nfsdcld.c
index 5ad94ce2..636c3983 100644
--- a/utils/nfsdcld/nfsdcld.c
+++ b/utils/nfsdcld/nfsdcld.c
@@ -27,6 +27,7 @@
 #include <event2/event.h>
 #include <stdbool.h>
 #include <getopt.h>
+#include <signal.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -69,6 +70,7 @@ static int 		inotify_fd = -1;
 static struct event	 *pipedir_event;
 static struct event_base *evbase;
 static bool old_kernel = false;
+static bool signal_received = false;
 
 uint64_t current_epoch;
 uint64_t recovery_epoch;
@@ -89,6 +91,19 @@ static struct option longopts[] =
 /* forward declarations */
 static void cldcb(int UNUSED(fd), short which, void *data);
 
+static void
+sig_die(int signal)
+{
+	if (signal_received) {
+		xlog(D_GENERAL, "forced exiting on signal %d\n", signal);
+		exit(0);
+	}
+
+	signal_received = true;
+	xlog(D_GENERAL, "exiting on signal %d\n", signal);
+	event_base_loopexit(evbase, NULL);
+}
+
 static void
 usage(char *progname)
 {
@@ -881,14 +896,27 @@ main(int argc, char **argv)
 	if (rc)
 		goto out;
 
+	signal(SIGINT, sig_die);
+	signal(SIGTERM, sig_die);
+
 	xlog(D_GENERAL, "%s: Starting event dispatch handler.", __func__);
 	rc = event_base_dispatch(evbase);
 	if (rc < 0)
 		xlog(L_ERROR, "%s: event_dispatch failed: %m", __func__);
 
-	close(clnt.cl_fd);
-	close(inotify_fd);
 out:
+	if (clnt.cl_event)
+		event_free(clnt.cl_event);
+	if (clnt.cl_fd != -1)
+		close(clnt.cl_fd);
+	if (pipedir_event)
+		event_free(pipedir_event);
+	if (inotify_fd != -1)
+		close(inotify_fd);
+
+	event_base_free(evbase);
+	sqlite_shutdown();
+
 	free(progname);
 	return rc;
 }
diff --git a/utils/nfsdcld/sqlite.c b/utils/nfsdcld/sqlite.c
index e2586c39..8fd1d0c2 100644
--- a/utils/nfsdcld/sqlite.c
+++ b/utils/nfsdcld/sqlite.c
@@ -1404,3 +1404,18 @@ sqlite_first_time_done(void)
 	sqlite3_free(err);
 	return ret;
 }
+
+/*
+ * Closes all sqlite3 resources and shuts down the library.
+ *
+ */
+void
+sqlite_shutdown(void)
+{
+	if (dbh != NULL) {
+		sqlite3_close(dbh);
+		dbh = NULL;
+	}
+
+	sqlite3_shutdown();
+}
diff --git a/utils/nfsdcld/sqlite.h b/utils/nfsdcld/sqlite.h
index 0a26ad67..044236cf 100644
--- a/utils/nfsdcld/sqlite.h
+++ b/utils/nfsdcld/sqlite.h
@@ -34,4 +34,5 @@ int sqlite_iterate_recovery(int (*cb)(struct cld_client *clnt), struct cld_clien
 int sqlite_delete_cltrack_records(void);
 int sqlite_first_time_done(void);
 
+void sqlite_shutdown(void);
 #endif /* _SQLITE_H */
-- 
2.26.2