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“Linux Sysfs frequently Asked Questions in various Linux Sysfs job Interviews by interviewer. The set of questions here ensures that you offer a perfect answer posed to you. So get preparation for your new job hunting”

50 Linux Sysfs Questions And Answers

1⟩ The directories of /sys directory a) are created at system startup when the subsystems register themselves with object core b) are created when any device is connects with the system c) are created at the time of kernel compilation d) none of the mentioned

a) are created at system startup when the subsystems register themselves with kobject core

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2⟩ The directory /sys/block contains a) sub-directories for each block device b) symbolic link for each block device only c) device file for each block device only d) none of the mentioned

a) sub-directories for each block device

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3⟩ In sysfs, each represented bus type has two directories named as a) attributes and kobjects b) devices and drivers c) devices and kobjects d) none of the mentioned

b) devices and drivers

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4⟩ A device class describes the ____ type of device. a) physical b) stuctural c) functional d) none of the mentioned

c) functional

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5⟩ Which one of the following directory contains every physical device that has been discovered by the bus types registered with the kernel? a) /sys/devices b) /sys/bus/devices c) /devices d) none of the mentioned

a) /sys/devices

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6⟩ Which type of devices are peripheral devices? a) platform devices b) system devices c) both (a) and (b) d) none of the mentioned

b) system devices

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7⟩ Which one of the following is not a system device? a) CPU b) APIC c) timer d) none of the mentioned

d) none of the mentioned

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8⟩ Which one of the following is not a platform specific code? a) x86 BIOS b) EFI on ia64 c) both (a) and (b) d) none of the mentioned

d) none of the mentioned

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9⟩ In device driver model bus_type object contains the a) name of the bus type b) set of kobjects of the drivers c) set of kobjects of the devices d) all of the mentioned

d) all of the mentioned

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10⟩ The file fs/sysfs/sysfs.h contains the a) internal header files for sysfs b) function definitions shared locally among the sysfs source c) both (a) and (b) d) none of the mentioned

c) both (a) and (b)

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11⟩ In sysfs.h which one of the following structure represents the directory entries? a) struct sysfs_dirent b) struct sysfs_dir c) struct sysfs d) none of the mentioned

a) struct sysfs_dirent

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12⟩ Which one of the following is not true? a) kobjects are included in a hierarchic organisation b) kobjects can have a parent c) kobjects can be included in a kset d) none of the mentioned

d) none of the mentioned

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13⟩ The name pointer of the attribute data structure represents the _____ in sysfs. a) directory b) file c) symbolic link d) none of the mentioned

b) file

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14⟩ To read/write attribute, which one of the following method is required? a) show b) store c) both (a) and (b) d) none of the mentioned

c) both (a) and (b)

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15⟩ Which one of the following is not contained in the kobject data structure? a) pointer to the kobject type descriptor b) pointer to the containing kset c) pointer to the parent kobject d) none of the mentioned

d) none of the mentioned

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16⟩ The kobjects can be organized in a hierarchical tree by means of a) ksets b) kref c) ktype d) none of the mentioned

a) ksets

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17⟩ Which one of the following is a element of a kset data structure? a) pointer to the subsystem descriptor b) pointer to the kobject type descriptor of the kset c) both (a) and (b) d) none of the mentioned

c) both (a) and (b)

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18⟩ Which one of the following function is used to add the kobject to sysfs? a) kobject_add() b) kobject_register() c) kobject_init() d) all of the mentioned

d) all of the mentioned

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19⟩ Which one of the following function is used to create a new attribute? a) sysfs_create_file() b) sysfs_attribute c) both (a) and (b) d) none of the mentioned

a) sysfs_create_file()

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20⟩ Sysfs attribute should export ____ value per file. a) one b) two c) three d) four

a) one

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