FreeBSD Manual Pages
VOP_OPEN(9) Kernel Developer's Manual VOP_OPEN(9) NAME VOP_OPEN, VOP_CLOSE -- open or close a file SYNOPSIS #include <sys/param.h> #include <sys/vnode.h> int VOP_OPEN(struct vnode *vp, int mode, struct ucred *cred, struct thread *td, struct file *fp); int VOP_CLOSE(struct vnode *vp, int mode, struct ucred *cred, struct thread *td); DESCRIPTION The VOP_OPEN() entry point is called before a file is accessed by a process and the VOP_CLOSE() entry point is called after a file is fin- ished with by the process. The arguments are: vp The vnode of the file. mode The access mode required by the calling process. cred The caller's credentials. td The thread which is accessing the file. fp The file being opened. Pointer to the file fp is useful for file systems which require such information, e.g., fdescfs(5). Use `NULL' as fp argument to VOP_OPEN() for in-kernel opens. The access mode is a set of flags, including FREAD, FWRITE, O_NONBLOCK, O_APPEND. The thread td passed to VOP_CLOSE() may be `NULL' if the last reference to the open file is released from a kernel context, e.g., the destruc- tion of a socket buffer containing the file reference in a SCM_RIGHTS message. LOCKS VOP_OPEN() expects vp to be locked on entry and will leave it locked on return. VOP_CLOSE() expects at least a reference to be associated with the vn- ode and does not care whether the vnode is locked or not. The lock and reference state is left unchanged on return. Note that vn_close ex- pects an unlocked, referenced vnode and will dereference the vnode prior to returning. RETURN VALUES Zero is returned on success, otherwise an error code is returned. SEE ALSO vnode(9), VOP_LOOKUP(9) AUTHORS This manual page was written by Doug Rabson. FreeBSD ports 15.quarterly October 17, 2025 VOP_OPEN(9)
NAME | SYNOPSIS | DESCRIPTION | LOCKS | RETURN VALUES | SEE ALSO | AUTHORS
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