preparatory patch for -Wwrite-strings #5

networking/libiproute/ip_common.h

@@ -14,7 +14,8 @@
 #endif
 
 extern int preferred_family;
-extern char * _SL_;
+//FIXME! Appears in two .h files!
+extern const char * _SL_;
 
 extern void ip_parse_common_args(int *argcp, char ***argvp);
 extern int print_neigh(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);

networking/libiproute/ip_parse_common_args.c

@@ -24,7 +24,7 @@
 
 int preferred_family = AF_UNSPEC;
 int oneline = 0;
-char * _SL_ = NULL;
+const char * _SL_ = NULL;
 
 void ip_parse_common_args(int *argcp, char ***argvp)
 {

networking/libiproute/iplink.c

@@ -25,7 +25,7 @@
 /* take from linux/sockios.h */
 #define SIOCSIFNAME	0x8923		/* set interface name */
 
-static int on_off(char *msg)
+static int on_off(const char *msg)
 {
 	bb_error_msg("error: argument of \"%s\" must be \"on\" or \"off\"", msg);
 	return -1;

networking/libiproute/iproute.c

@@ -469,21 +469,15 @@ static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 
 static int iproute_flush_cache(void)
 {
-#define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
-
-	int len;
-	int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
-	char *buffer = "-1";
-
+	static const char fn[] = "/proc/sys/net/ipv4/route/flush";
+	int flush_fd = open(fn, O_WRONLY);
 	if (flush_fd < 0) {
-		fprintf(stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
+		bb_perror_msg("cannot open '%s'", fn);
 		return -1;
 	}
 
-	len = strlen (buffer);
-
-	if ((write (flush_fd, (void *)buffer, len)) < len) {
-		fprintf(stderr, "Cannot flush routing cache\n");
+	if (write(flush_fd, "-1", 2) < 2) {
+		bb_perror_msg("cannot flush routing cache");
 		return -1;
 	}
 	close(flush_fd);

networking/libiproute/utils.h

@@ -14,7 +14,8 @@ extern int show_details;
 extern int show_raw;
 extern int resolve_hosts;
 extern int oneline;
-extern char * _SL_;
+//FIXME! Appears in two .h files!
+extern const char * _SL_;
 
 #ifndef IPPROTO_ESP
 #define IPPROTO_ESP	50