Get seed from /dev/urandom instead of using time(2)

main.c

@@ -18,13 +18,28 @@
 
 #include "sud.h"
 
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <time.h>
+
+static uint32_t getseed(void)
+{
+	FILE *urandom = fopen("/dev/urandom", "rb");
+	if (urandom == NULL)
+		fprintf(stderr, "Failed to open /dev/urandom\n");
+
+	uint32_t seed = 0;
+	for (unsigned i = 0; i < 4; ++i)
+		seed = seed << 8 | fgetc(urandom);
+
+	fclose(urandom);
+
+	return seed;
+}
 
 int main(void)
 {
-	unsigned seed = time(NULL);
+	uint32_t seed = getseed();
 	printf("Seed: %u\n\n", seed);
 	srand(seed);