Index: grepcidr.c
--- grepcidr.c.orig
+++ grepcidr.c
@@ -580,6 +580,12 @@ int main(int argc, char* argv[])
 	char* pat_strings = NULL;		/* pattern strings on command line */
 	int foundopt;
 	
+	if (pledge("stdio rpath", NULL) == -1)
+	{
+		fprintf(stderr, "grepcidr: pledge()");
+		return EXIT_ERROR;
+	}
+
 	if ((CHAR_BIT != 8) || (sizeof(unsigned int) < 4) ||
 		(sizeof(struct in_addr) != 4) || (sizeof(struct in6_addr) != 16))
 	{
@@ -660,8 +666,15 @@ int main(int argc, char* argv[])
 	{	/* Search each specified file name, or just stdin */
 		const char* curfilename = NULL;
 		FILE* inp_stream;
-		if (optind >= argc)
+		if (optind >= argc) {
 			inp_stream = stdin;
+
+			if (pledge("stdio", NULL) == -1)
+			{
+				fprintf(stderr, "grepcidr: pledge()");
+				return EXIT_ERROR;
+			}
+		}
 		else
 		{
 			/* One or more file names are specified on the command line */