5 files changed, 11 insertions, 0 deletions
diff --git a/sys/include/sys/fcntl.h b/sys/include/sys/fcntl.h
index 7a62cdd..122a378 100644
--- a/sys/include/sys/fcntl.h
+++ b/sys/include/sys/fcntl.h
@@ -34,4 +34,9 @@
 #define O_WRONLY    0x0001
 #define O_RDWR      0x0002
 
+/* Makes seal checking easier */
+#if defined(_KERNEL)
+#define O_ALLOW_WR (O_RDWR | O_WRONLY)
+#endif
+
 #endif  /* !_SYS_FCTNL_H_ */
diff --git a/sys/include/sys/filedesc.h b/sys/include/sys/filedesc.h
index 9a6230a..a544811 100644
--- a/sys/include/sys/filedesc.h
+++ b/sys/include/sys/filedesc.h
@@ -39,12 +39,14 @@ struct filedesc {
     off_t offset;
     bool is_dir;
     int refcnt;
+    int flags;
     struct vnode *vp;
     struct spinlock lock;
 };
 
 int fd_close(unsigned int fd);
 int fd_read(unsigned int fd, void *buf, size_t count);
+int fd_write(unsigned int fd, void *buf, size_t count);
 
 int fd_alloc(struct filedesc **fd_out);
 int fd_open(const char *pathname, int flags);
diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index b724e8b..41d1e78 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -42,6 +42,7 @@
 #define SYS_close   4
 #define SYS_stat    5
 #define SYS_sysctl  6
+#define SYS_write   7
 
 #if defined(_KERNEL)
 /* Syscall return value and arg type */
diff --git a/sys/include/sys/vfs.h b/sys/include/sys/vfs.h
index 61f6673..1ff722a 100644
--- a/sys/include/sys/vfs.h
+++ b/sys/include/sys/vfs.h
@@ -38,6 +38,7 @@
 scret_t sys_open(struct syscall_args *scargs);
 scret_t sys_close(struct syscall_args *args);
 scret_t sys_read(struct syscall_args *scargs);
+scret_t sys_write(struct syscall_args *sargs);
 scret_t sys_stat(struct syscall_args *scargs);
 
 #endif  /* _KERNEL */
diff --git a/sys/include/sys/vnode.h b/sys/include/sys/vnode.h
index 5cbaa15..33092f9 100644
--- a/sys/include/sys/vnode.h
+++ b/sys/include/sys/vnode.h
@@ -101,6 +101,7 @@ struct vops {
     int(*lookup)(struct vop_lookup_args *args);
     int(*getattr)(struct vop_getattr_args *args);
     int(*read)(struct vnode *vp, struct sio_txn *sio);
+    int(*write)(struct vnode *vp, struct sio_txn *sio);
     int(*reclaim)(struct vnode *vp);
 };
 
@@ -117,6 +118,7 @@ int vfs_release_vnode(struct vnode *vp);
 
 int vfs_vop_lookup(struct vnode *vp, struct vop_lookup_args *args);
 int vfs_vop_read(struct vnode *vp, struct sio_txn *sio);
+int vfs_vop_write(struct vnode *vp, struct sio_txn *sio);
 int vfs_vop_getattr(struct vnode *vp, struct vop_getattr_args *args);
 
 #endif  /* _KERNEL */