freebsd-skq/share/man/man9/VOP_IOCTL.9
2001-11-20 18:19:19 +00:00

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.\" Copyright (c) 1996 Doug Rabson
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.Dd July 24, 1996
.Os
.Dt VOP_IOCTL 9
.Sh NAME
.Nm VOP_IOCTL
.Nd device specific control
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fn VOP_IOCTL "struct vnode *vp" "u_long command" "caddr_t data" "int fflag" "struct ucred *cred" "struct thread *td"
.Sh DESCRIPTION
Manipulate a file in device dependent ways.
.Pp
Its arguments are:
.Bl -tag -width command
.It Ar vp
the vnode of the file (normally representing a device)
.It Ar command
the device specific operation to perform
.It Ar cnp
extra data for the specified operation
.It Ar fflag
some flags ???
.It Ar cred
the caller's credentials
.It Ar td
the calling thread
.El
.Pp
Most filesystems do not implement this entry point.
.Sh LOCKS
The file should not be locked on entry.
.Sh RETURN VALUES
If successful, zero is returned, otherwise an appropriate error code.
.Sh PSEUDOCODE
.Bd -literal
int
vop_ioctl(struct vnode *vp, int command, caddr_t data, int fflag,
struct ucred *cred, struct thread *td)
{
return EOPNOTSUPP;
}
.Ed
.Sh SEE ALSO
.Xr vnode 9
.Sh AUTHORS
This man page was written by
.An Doug Rabson .