VOP_ACCESS, VOP_ACCESSX — check access permissions of a file or Unix domain socket

       This manual page was written by Doug Rabson.

Debian                                         September 18, 2009                                  VOP_ACCESS(9)

       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.

       [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.

       The vnode will be locked on entry and should remain locked on return.

       VOP_ACCESS, VOP_ACCESSX — check access permissions of a file or Unix domain socket

       If the file is accessible in the specified way, then zero is returned,  otherwise  an  appropriate  error
       code is returned.

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

#include<sys/param.h>#include<sys/vnode.h>intVOP_ACCESS(structvnode*vp, accmode_taccmode, structucred*cred, structthread*td);

       intVOP_ACCESSX(structvnode*vp, accmode_taccmode, structucred*cred, structthread*td);