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Test Your Knowledge in Computers #535
Difficulty: Medium
In C, the Boolean type false is associated with zero while any non-zero value is associated with true.
True or False?
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removable-media(9p) [bsd man page]

removable-media(9P)					   Kernel Properties for Drivers				       removable-media(9P)

NAME
removable-media - removable media device property DESCRIPTION
A device that supports removable media--such as CDROM, JAZZ, and ZIP drives--and that supports power management and expects automatic mounting of the device via the volume manager should export the boolean (zero length) property removable-media. This property enables the system to make the power state of the device dependent on the power state of the frame buffer and monitor. See the power.conf(4) discussion of the device-dependency-property entry for more information. Devices that behave like removable devices (such as PC ATA cards, where the controller and media both are removed at the same time) should also export this property. EXAMPLES
Example 1: removable-media Entry An example of a removable-media entry from the .conf file of a driver is shown below. # This entry keeps removable media from being powered down unless # the console framebuffer and monitor are powered down # removable-media=1; Example 2: Implementation in attach() Below is an example of how the entry above would be implemented in the attach(9E) function of the driver. xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd) { ... if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP, "removable-media", NULL, 0)) != DDI_PROP_SUCCESS) goto failed; ... } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
power.conf(4), pm(7D), attach(9E), detach(9E), ddi_prop_create(9F) Writing Device Drivers SunOS 5.10 15 Jun 2001 removable-media(9P)

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removable-media(9P)					   Kernel Properties for Drivers				       removable-media(9P)

NAME
removable-media - removable media device property DESCRIPTION
A device that supports removable media--such as CDROM, JAZZ, and ZIP drives--and that supports power management and expects automatic mounting of the device via the volume manager should export the boolean (zero length) property removable-media. This property enables the system to make the power state of the device dependent on the power state of the frame buffer and monitor. See the power.conf(4) discussion of the device-dependency-property entry for more information. Devices that behave like removable devices (such as PC ATA cards, where the controller and media both are removed at the same time) should also export this property. EXAMPLES
Example 1: removable-media Entry An example of a removable-media entry from the .conf file of a driver is shown below. # This entry keeps removable media from being powered down unless # the console framebuffer and monitor are powered down # removable-media=1; Example 2: Implementation in attach() Below is an example of how the entry above would be implemented in the attach(9E) function of the driver. xxattach(dev_info_t *dip, ddi_attach_cmd_t cmd) { ... if (ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP, "removable-media", NULL, 0)) != DDI_PROP_SUCCESS) goto failed; ... } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
power.conf(4), pm(7D), attach(9E), detach(9E), ddi_prop_create(9F) Writing Device Drivers SunOS 5.10 15 Jun 2001 removable-media(9P)

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