vop_ioctl(9) [posix man page]

VOP_IOCTL(9)						   BSD Kernel Developer's Manual					      VOP_IOCTL(9)

NAME

     VOP_IOCTL -- device specific control

SYNOPSIS

     #include <sys/param.h>
     #include <sys/vnode.h>

     int
     VOP_IOCTL(struct vnode *vp, u_long command, caddr_t data, int fflag, struct ucred *cred, struct thread *td);

DESCRIPTION

     Manipulate a file in device dependent ways.

     Its arguments are:

     vp       The vnode of the file (normally representing a device).

     command  The device specific operation to perform.

     data     Extra data for the specified operation.

     fflag    Some flags ???

     cred     The caller's credentials.

     td       The calling thread.

     Most file systems do not implement this entry point.

LOCKS

     The file should not be locked on entry.

RETURN VALUES

     If successful, zero is returned, otherwise an appropriate error code.

     If the ioctl is not recognized or not handled, ENOTTY should be returned.

SEE ALSO

     vnode(9)

AUTHORS

     This manual page was written by Doug Rabson.

BSD
								   July 24, 1996							       BSD

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 ALSO

     vaccess(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