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-rw-r--r--tools/testing/selftests/bpf/urandom_read.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/urandom_read.c b/tools/testing/selftests/bpf/urandom_read.c
new file mode 100644
index 000000000..db7810527
--- /dev/null
+++ b/tools/testing/selftests/bpf/urandom_read.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+#define BUF_SIZE 256
+
+static __attribute__((noinline))
+void urandom_read(int fd, int count)
+{
+ char buf[BUF_SIZE];
+ int i;
+
+ for (i = 0; i < count; ++i)
+ read(fd, buf, BUF_SIZE);
+}
+
+int main(int argc, char *argv[])
+{
+ int fd = open("/dev/urandom", O_RDONLY);
+ int count = 4;
+
+ if (fd < 0)
+ return 1;
+
+ if (argc == 2)
+ count = atoi(argv[1]);
+
+ urandom_read(fd, count);
+
+ close(fd);
+ return 0;
+}