From 73a7133b6e42edc218da5b8011c580ed48c7731a Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sat, 28 Mar 2015 18:12:21 +0100
Subject: [PATCH] properly handle return codes

Signed-off-by: John Crispin <blogic@openwrt.org>
---
 src/config.c    | 11 ++++++-----
 src/dhcpv6-ia.c |  2 +-
 src/ndp.c       |  4 ++--
 src/odhcpd.c    |  4 ++--
 src/odhcpd.h    |  2 +-
 5 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/src/config.c b/src/config.c
index 5fbb921..9dbe7f0 100644
--- a/src/config.c
+++ b/src/config.c
@@ -683,9 +683,10 @@ void odhcpd_reload(void)
 static void handle_signal(int signal)
 {
 	char b[1] = {0};
-	if (signal == SIGHUP)
-		write(reload_pipe[1], b, sizeof(b));
-	else
+
+	if (signal == SIGHUP) {
+		if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
+	} else
 		uloop_end();
 }
 
@@ -694,7 +695,7 @@ static void handle_signal(int signal)
 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 {
 	char b[512];
-	read(u->fd, b, sizeof(b));
+	if (read(u->fd, b, sizeof(b) < 0)) {}
 	odhcpd_reload();
 }
 
@@ -702,7 +703,7 @@ static struct uloop_fd reload_fd = { .cb = reload_cb };
 
 void odhcpd_run(void)
 {
-	pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC);
+	if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 	reload_fd.fd = reload_pipe[0];
 	uloop_fd_add(&reload_fd, ULOOP_READ);
 
diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c
index 7db4cee..74e3441 100644
--- a/src/dhcpv6-ia.c
+++ b/src/dhcpv6-ia.c
@@ -219,7 +219,7 @@ void dhcpv6_write_statefile(void)
 			return;
 
 		lockf(fd, F_LOCK, 0);
-		ftruncate(fd, 0);
+		if (ftruncate(fd, 0) < 0) {}
 
 		FILE *fp = fdopen(fd, "w");
 		if (!fp) {
diff --git a/src/ndp.c b/src/ndp.c
index 45bb9db..5e8b5ac 100644
--- a/src/ndp.c
+++ b/src/ndp.c
@@ -132,7 +132,7 @@ int setup_ndp_interface(struct interface *iface, bool enable)
 		iface->ndp_event.uloop.fd = -1;
 
 		if (!enable || iface->ndp != RELAYD_RELAY)
-			write(procfd, "0\n", 2);
+			if (write(procfd, "0\n", 2) < 0) {}
 
 		dump_neigh = true;
 	}
@@ -152,7 +152,7 @@ int setup_ndp_interface(struct interface *iface, bool enable)
 	}
 
 	if (enable && iface->ndp == RELAYD_RELAY) {
-		write(procfd, "1\n", 2);
+		if (write(procfd, "1\n", 2) < 0) {}
 		close(procfd);
 
 		int sock = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, htons(ETH_P_IPV6));
diff --git a/src/odhcpd.c b/src/odhcpd.c
index 76dee9e..52bca13 100644
--- a/src/odhcpd.c
+++ b/src/odhcpd.c
@@ -415,9 +415,9 @@ void odhcpd_process(struct odhcpd_event *event)
 	odhcpd_receive_packets(&event->uloop, 0);
 }
 
-void odhcpd_urandom(void *data, size_t len)
+int odhcpd_urandom(void *data, size_t len)
 {
-	read(urandom_fd, data, len);
+	return read(urandom_fd, data, len);
 }
 
 
diff --git a/src/odhcpd.h b/src/odhcpd.h
index 1ada4aa..21dc99f 100644
--- a/src/odhcpd.h
+++ b/src/odhcpd.h
@@ -190,7 +190,7 @@ int odhcpd_get_interface_mtu(const char *ifname);
 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 struct interface* odhcpd_get_interface_by_index(int ifindex);
 struct interface* odhcpd_get_master_interface(void);
-void odhcpd_urandom(void *data, size_t len);
+int odhcpd_urandom(void *data, size_t len);
 void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
 		const struct interface *iface, const struct in6_addr *gw, bool add);
 
-- 
2.11.0