1 files changed, 2 insertions, 2 deletions
diff --git a/mymalloc.h b/mymalloc.h
index e781b43..eda669f 100644
--- a/mymalloc.h
+++ b/mymalloc.h
@@ -69,9 +69,9 @@ static void *my_mmap(size_t size)
          if (fd < 0) {
                  flags |= MAP_ANONYMOUS;
          } else {
-                ssize_t w = pwrite(fd, "", 1, size - 1); /* sparse file */
+                int t = ftruncate(fd, size); /* sparse file */
  
-                if (w <= 0) { /* 0 may be ENOSPC */
+                if (t < 0) {
                          flags |= MAP_ANONYMOUS;
                          close(fd);
                          fd = -1;