fixes for 4.3.3 GCC warnings/errors

After fetching current git code and compiling with gcc 4.3.3 got errors
related to Werror (2 functions was ignoring return value), and ulimits.h was
not declared, but INT_MAX used
Here is fix, so rstp compile fine with gcc 4.3.3

Signed-off-by: Denys Fedoryschenko <denys@visp.net.lb>

Author: nuclearcat

bridge_track.c

@@ -386,14 +386,19 @@ void delete_if(struct ifdata *ifc)
 static int stp_enabled(struct ifdata *br)
 {
 	char path[40 + IFNAMSIZ];
+	int ret;
 	sprintf(path, "/sys/class/net/%s/bridge/stp_state", br->name);
 	FILE *f = fopen(path, "r");
 	if (!f) {
 		LOG("Open %s failed", path);
 		return 0;
 	}
 	int enabled = 0;
-	fscanf(f, "%d", &enabled);
+	ret = fscanf(f, "%d", &enabled);
+	if (!ret) {
+		LOG("%s, stp_state parsing error", path);
+		return 0;
+	}
 	fclose(f);
 	INFO("STP on %s state %d", br->name, enabled);
 

ctl_main.c

@@ -16,6 +16,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <limits.h>
 
 #include "ctl_socket_client.h"
 #include "ctl_functions.h"

main.c

@@ -42,7 +42,7 @@ int log_level = LOG_LEVEL_DEFAULT;
 
 int main(int argc, char *argv[])
 {
-	int c;
+	int c,ret;
 	while ((c = getopt(argc, argv, "dv:")) != -1) {
 		switch (c) {
 		case 'd':
@@ -78,7 +78,11 @@ int main(int argc, char *argv[])
 			return -1;
 		}
 		openlog("rstpd", 0, LOG_DAEMON);
-		daemon(0, 0);
+		ret = daemon(0, 0);
+		if (ret) {
+			ERROR("daemon() failed");
+			return -1;		    
+		}
 		is_daemon = 1;
 		fprintf(f, "%d", getpid());
 		fclose(f);

netif_utils.c

@@ -32,6 +32,7 @@
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
+#include <limits.h>
 
 #include <net/if.h>
 #include <linux/if_ether.h>