Reads the contents of a symbolic link.
int vn_readlink (vp, uio, crp) struct vnode *vp; struct uio *uio; struct ucred *crp;
| vp | Points to a virtual node (v-node) structure. The vn_readlink entry point holds this v-node for the duration of the routine. |
| uio | Points to a uio structure. This structure contains the information required to read the link. In addition, it contains the return buffer for the vn_readlink entry point. |
| crp | Points to the cred structure. This structure contains data that the file system can use to validate access permission. |
The vn_readlink entry point is used by the logical file system to get the contents of a symbolic link, if the file system supports symbolic links. The logical file system finds the v-node (virtual node) for the symbolic link, so this routine simply reads the data blocks for the symbol link.
The vn_readlink entry point can be called from the process environment only.
| 0 | Indicates success. |
Nonzero return values are returned from the /usr/include/sys/errno.h file to indicate failure.
The uio structure.
Virtual File System Overview, Virtual File System Kernel Extensions Overview, Logical File System Overview, Understanding Virtual Nodes (V-nodes) in AIX Kernel Extensions and Device Support Programming Concepts.
List of Virtual File System Operations.