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VOP_IOCTL (9) | Kernel routines | Unix Manual Pages | :man

NAME

VOP_IOCTL - device specific control

CONTENTS

Synopsis
Description
Locks
Return Values
Pseudocode
See Also
Authors

SYNOPSIS


.In sys/param.h
.In 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.

PSEUDOCODE


int
vop_ioctl(struct vnode *vp, int command, caddr_t data, int fflag,
struct ucred *cred, struct thread *td)
{


return ENOTTY;
}

SEE ALSO

vnode(9)

AUTHORS


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