streamline copyin/copyout code in usertests

fix bugs in read/write return values when there's an error

3 files changed, 3 insertions, 3 deletions

diff --git a/kernel/console.c b/kernel/console.c
index 9a18cd9..2b1ed3c 100644
--- a/kernel/console.c
+++ b/kernel/console.c
@@ -76,7 +76,7 @@ consolewrite(int user_src, uint64 src, int n)
   }
   release(&cons.lock);
 
-  return n;
+  return i;
 }
 
 //
diff --git a/kernel/fs.c b/kernel/fs.c
index e33ec30..ec68cd7 100644
--- a/kernel/fs.c
+++ b/kernel/fs.c
@@ -472,7 +472,7 @@ readi(struct inode *ip, int user_dst, uint64 dst, uint off, uint n)
     }
     brelse(bp);
   }
-  return n;
+  return tot;
 }
 
 // Write data to inode.
diff --git a/kernel/pipe.c b/kernel/pipe.c
index c066afb..7ed402d 100644
--- a/kernel/pipe.c
+++ b/kernel/pipe.c
@@ -96,7 +96,7 @@ pipewrite(struct pipe *pi, uint64 addr, int n)
   }
   wakeup(&pi->nread);
   release(&pi->lock);
-  return n;
+  return i;
 }
 
 int