1 files changed, 62 insertions, 0 deletions
diff --git a/src/tests/filesys/extended/grow-two-files.c b/src/tests/filesys/extended/grow-two-files.c
new file mode 100644
index 0000000..6a8fb1c
--- /dev/null
+++ b/src/tests/filesys/extended/grow-two-files.c
@@ -0,0 +1,62 @@
+/* Grows two files in parallel and checks that their contents are
+   correct. */
+
+#include <random.h>
+#include <syscall.h>
+#include "tests/lib.h"
+#include "tests/main.h"
+
+#define FILE_SIZE 8143
+static char buf_a[FILE_SIZE];
+static char buf_b[FILE_SIZE];
+
+static void
+write_some_bytes (const char *file_name, int fd, const char *buf, size_t *ofs) 
+{
+  if (*ofs < FILE_SIZE) 
+    {
+      size_t block_size = random_ulong () % (FILE_SIZE / 8) + 1;
+      size_t ret_val;
+      if (block_size > FILE_SIZE - *ofs)
+        block_size = FILE_SIZE - *ofs;
+
+      ret_val = write (fd, buf + *ofs, block_size);
+      if (ret_val != block_size)
+        fail ("write %zu bytes at offset %zu in \"%s\" returned %zu",
+              block_size, *ofs, file_name, ret_val);
+      *ofs += block_size;
+    }
+}
+
+void
+test_main (void) 
+{
+  int fd_a, fd_b;
+  size_t ofs_a = 0, ofs_b = 0;
+
+  random_init (0);
+  random_bytes (buf_a, sizeof buf_a);
+  random_bytes (buf_b, sizeof buf_b);
+
+  CHECK (create ("a", 0), "create \"a\"");
+  CHECK (create ("b", 0), "create \"b\"");
+
+  CHECK ((fd_a = open ("a")) > 1, "open \"a\"");
+  CHECK ((fd_b = open ("b")) > 1, "open \"b\"");
+
+  msg ("write \"a\" and \"b\" alternately");
+  while (ofs_a < FILE_SIZE || ofs_b < FILE_SIZE) 
+    {
+      write_some_bytes ("a", fd_a, buf_a, &ofs_a);
+      write_some_bytes ("b", fd_b, buf_b, &ofs_b);
+    }
+
+  msg ("close \"a\"");
+  close (fd_a);
+
+  msg ("close \"b\"");
+  close (fd_b);
+
+  check_file ("a", buf_a, FILE_SIZE);
+  check_file ("b", buf_b, FILE_SIZE);
+}