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Test Your Knowledge in Computers #510
Difficulty: Easy
Variable names cannot be the same as any reserved word as the language would not be able to distinguish between them.
True or False?
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idr_replace(9) [centos man page]

IDR_REPLACE(9)						  Basic Kernel Library Functions					    IDR_REPLACE(9)

idr_replace - replace pointer for given id SYNOPSIS
void * idr_replace(struct idr * idp, void * ptr, int id); ARGUMENTS
idp idr handle ptr pointer you want associated with the id id lookup key DESCRIPTION
Replace the pointer registered with an id and return the old value. A -ENOENT return indicates that id was not found. A -EINVAL return indicates that id was not within valid constraints. The caller must serialize with writers. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 IDR_REPLACE(9)

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DEVICE_CREATE_VARGS(9)					   Device drivers infrastructure				    DEVICE_CREATE_VARGS(9)

device_create_vargs - creates a device and registers it with sysfs SYNOPSIS
struct device * device_create_vargs(struct class * class, struct device * parent, dev_t devt, void * drvdata, const char * fmt, va_list args); ARGUMENTS
class pointer to the struct class that this device should be registered to parent pointer to the parent struct device of this new device, if any devt the dev_t for the char device to be added drvdata the data to be added to the device for callbacks fmt string for the device's name args va_list for the device's name DESCRIPTION
This function can be used by char device classes. A struct device will be created in sysfs, registered to the specified class. A "dev" file will be created, showing the dev_t for the device, if the dev_t is not 0,0. If a pointer to a parent struct device is passed in, the newly created struct device will be a child of that device in sysfs. The pointer to the struct device will be returned from the call. Any further sysfs files that might be required can be created using this pointer. Returns struct device pointer on success, or ERR_PTR on error. NOTE
the struct class passed to this function must have previously been created with a call to class_create. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 DEVICE_CREATE_VARGS(9)

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