VOP_ACCESS(9) BSD Kernel Developer's Manual VOP_ACCESS(9)NAME
VOP_ACCESS, VOP_ACCESSX — check access permissions of a file or Unix
domain socket
SYNOPSIS
#include <sys/param.h>
#include <sys/vnode.h>
int
VOP_ACCESS(struct vnode *vp, accmode_t accmode, struct ucred *cred,
struct thread *td);
int
VOP_ACCESSX(struct vnode *vp, accmode_t accmode, struct ucred *cred,
struct thread *td);
DESCRIPTION
This entry point checks the access permissions of the file against the
given credentials.
Its arguments are:
vp The vnode of the file to check.
accmode The type of access required.
cred The user credentials to check.
td The thread which is checking.
The accmode is a mask which can contain flags described in <sys/vnode.h>,
e.g. VREAD, VWRITE or VEXEC. For VOP_ACCESS(), the only flags that may
be set in accmode are VEXEC, VWRITE, VREAD, VADMIN and VAPPEND. To check
for other flags, one has to use VOP_ACCESSX() instead.
LOCKS
The vnode will be locked on entry and should remain locked on return.
RETURN VALUES
If the file is accessible in the specified way, then zero is returned,
otherwise an appropriate error code is returned.
ERRORS
[EPERM] An attempt was made to change an immutable file.
[EACCES] The permission bits the file mode or the ACL do not
permit the requested access.
SEE ALSOvaccess(9), vaccess_acl_nfs4(9), vaccess_acl_posix1e(9), vnode(9)AUTHORS
This manual page was written by Doug Rabson.
BSD September 18, 2009 BSD
