projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 13fec989 A |
1 | <h2>device_close</h2> |
| 2 | <hr> | |
| 3 | <p> | |
| 4 | <strong>Function</strong> - De-establish a connection to a device. | |
| 5 | <h3>SYNOPSIS</h3> | |
| 6 | <pre> | |
| 7 | <strong>#include< device/device.h></strong> | |
| 8 | ||
| 9 | <strong>kern_return_t device_close</strong> | |
| 10 | <strong>(mach_port_t</strong> <var>device</var><strong>);</strong> | |
| 11 | </pre> | |
| 12 | <h3>PARAMETERS</h3> | |
| 13 | <dl> | |
| 14 | <p> | |
| 15 | <dt> <var>device</var> | |
| 16 | <dd> | |
| 17 | [in device send right] | |
| 18 | A device port to the device to be closed. | |
| 19 | </dl> | |
| 20 | <h3>DESCRIPTION</h3> | |
| 21 | <p> | |
| 22 | The <strong>device_close</strong> function destroys the associated device | |
| 23 | port. The open count | |
| 24 | for the named device is decremented. If this count reaches zero, the close | |
| 25 | operation of the device driver is invoked, closing the device. | |
| 26 | <h3>NOTES</h3> | |
| 27 | <p> | |
| 28 | <strong>device_close</strong> will destroy any mapped device windows | |
| 29 | obtained through this | |
| 30 | device port. | |
| 31 | <h3>RETURN VALUES</h3> | |
| 32 | <dl> | |
| 33 | <p> | |
| 34 | <dt> <strong>D_NO_SUCH_DEVICE</strong> | |
| 35 | <dd> | |
| 36 | No device with that name, or the device is not operational. | |
| 37 | </dl> | |
| 38 | <h3>RELATED INFORMATION</h3> | |
| 39 | <p> | |
| 40 | Functions: | |
| 41 | <a href="device_open.html"><strong>device_open</strong></a>. |