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.