core: add random number generator

core/sys/darwin/random.c

@@ -0,0 +1,35 @@
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+
+uint64_t z__b_platform_random_seed()
+{
+	int fd = open("/dev/urandom", O_RDONLY);
+	if (fd == -1) {
+		return (uint64_t)-1;
+	}
+
+	uint64_t v = 0;
+	if (read(fd, &v, sizeof v) != sizeof v) {
+		close(fd);
+		return (uint64_t)-1;
+	}
+
+	return v;
+}
+
+uint64_t z__b_platform_random_seed_secure()
+{
+	int fd = open("/dev/random", O_RDONLY);
+	if (fd == -1) {
+		return (uint64_t)-1;
+	}
+
+	uint64_t v = 0;
+	if (read(fd, &v, sizeof v) != sizeof v) {
+		close(fd);
+		return (uint64_t)-1;
+	}
+
+	return v;
+}

core/sys/linux/random.c

@@ -0,0 +1,35 @@
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+uint64_t z__c_platform_random_seed()
+{
+	int fd = open("/dev/urandom", O_RDONLY);
+	if (fd == -1) {
+		return (uint64_t)-1;
+	}
+
+	uint64_t v = 0;
+	if (read(fd, &v, sizeof v) != sizeof v) {
+		close(fd);
+		return (uint64_t)-1;
+	}
+
+	return v;
+}
+
+uint64_t z__c_platform_random_seed_secure()
+{
+	int fd = open("/dev/random", O_RDONLY);
+	if (fd == -1) {
+		return (uint64_t)-1;
+	}
+
+	uint64_t v = 0;
+	if (read(fd, &v, sizeof v) != sizeof v) {
+		close(fd);
+		return (uint64_t)-1;
+	}
+
+	return v;
+}