kernel: Add ref count to filedesc

Keep track of how many threads are currently using the file descriptor.
This will be useful when fork() is implemented.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 371c1a5..937ae87 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -90,6 +90,7 @@ fd_alloc(struct filedesc **fd_out)
             return -ENOMEM;
         }
 
+        fd->refcnt = 1;
         fd->fdno = i;
         td->fds[i] = fd;