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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 ALSO

     vaccess(9), vaccess_acl_nfs4(9), vaccess_acl_posix1e(9), vnode(9)

AUTHORS

     This manual page was written by Doug Rabson.