2 files changed, 61 insertions, 1 deletions

diff --git a/src/sys/include/os/filedesc.h b/src/sys/include/os/filedesc.h
index a6a2ac5..95400ed 100644
--- a/src/sys/include/os/filedesc.h
+++ b/src/sys/include/os/filedesc.h
@@ -30,6 +30,7 @@
 #ifndef _OS_FILEDESC_H_
 #define _OS_FILEDESC_H_ 1
 
+#include <sys/seek.h>
 #include <sys/types.h>
 #include <os/vnode.h>
 
@@ -51,6 +52,18 @@ struct filedesc {
 };
 
 /*
+ * Allocate a file descriptor from a specific process's
+ * file descriptor table
+ *
+ * @procp: Process to allocate fd from
+ * @fd_res: Result pointer is written here
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value upon failure
+ */
+int fd_alloc(struct proc *procp, struct filedesc **fd_res);
+
+/*
  * Duplicate a file descriptor
  *
  * @procp: Process to duplicate from
@@ -62,6 +75,18 @@ struct filedesc {
 struct filedesc *fd_dup(struct proc *procp, int fd);
 
 /*
+ * Look up a file descriptor that belongs to a specific
+ * process by using its fd number
+ *
+ * @procp: Process to look up
+ * @fd: File descriptor number
+ *
+ * Returns the file descriptor pointer on success,
+ * otherwise a less than zero value on failure
+ */
+struct filedesc *fd_get(struct proc *procp, int fd);
+
+/*
  * Initialize a process file descriptor table
  * and set up standard streams
  *
@@ -117,4 +142,13 @@ ssize_t write(int fd, const void *buf, size_t count);
  */
 ssize_t read(int fd, void *buf, size_t count);
 
+/*
+ * Reposition the file offset of a file
+ *
+ * @fd: File descriptor to reposition
+ * @offset: Offset to move `fd' to
+ * @whence: How it should be repositioned
+ */
+off_t lseek(int fd, off_t offset, int whence);
+
 #endif  /* !_OS_FILEDESC_H_ */
diff --git a/src/sys/include/os/vnode.h b/src/sys/include/os/vnode.h
index 628ba68..8cdcded 100644
--- a/src/sys/include/os/vnode.h
+++ b/src/sys/include/os/vnode.h
@@ -44,12 +44,14 @@ struct vop;
  * @VTYPE_NONE: Vnode is yet to be assigned a type
  * @VTYPE_FILE: Vnode references a file
  * @VTYPE_DIR:  Vnode references a directory
+ * @VTYPE_SOCK: Vnode references a socket
  * @__N_VTYPE:  Number of valid nodes on the system
  */
 typedef enum {
     VTYPE_NONE,
     VTYPE_FILE,
     VTYPE_DIR,
+    VTYPE_SOCK,
     __N_VTYPE
 } vtype_t;
 
@@ -88,9 +90,20 @@ struct vop_rw_data {
  * filesystem
  *
  * @ndp: Path component to create
+ * @vtype: Vnode type
  */
 struct vop_create_args {
     struct nameidata *ndp;
+    vtype_t vtype;
+};
+
+/*
+ * Represents attributes of a vnode
+ *
+ * @size: File size in bytes
+ */
+struct vattr {
+    size_t size;
 };
 
 /*
@@ -98,6 +111,7 @@ struct vop_create_args {
  * a specific vnode. These are implemented as callbacks
  */
 struct vop {
+    int(*getattr)(struct vnode *vp, struct vattr *res);
     int(*lookup)(struct vop_lookup_args *args);
     int(*reclaim)(struct vnode *vp, int flags);
     int(*create)(struct vop_create_args *args);
@@ -194,10 +208,22 @@ int vop_reclaim(struct vnode *vp, int flags);
  *
  * @vp: Vnode of parent directory
  * @ndp: Namei descriptor of path component
+ * @type: Vnode type to create with
  *
  * Returns zero on success, otherwise a less than zero
  * value on failure.
  */
-int vop_create(struct vnode *vp, struct nameidata *ndp);
+int vop_create(struct vnode *vp, struct nameidata *ndp, vtype_t type);
+
+/*
+ * Get the attributes of a file
+ *
+ * @vp: Vnode of file to get attributes of
+ * @res: Result of file to get attr of
+ *
+ * Returns zero on success, otherwise a less than
+ * zero value on failure
+ */
+int vop_getattr(struct vnode *vp, struct vattr *res);
 
 #endif  /* !_OS_VNODE_H_ */