JP2020052608A - Information processor and information processing method and program - Google Patents

Abstract

To make it possible to remove an external storage device from an information processor properly even when an application cannot request unmount processing.SOLUTION: An information processor to which an external storage device is attachable comprises an exception determination means determining whether exception processing regarding a process occurs while executing the process controlling display of a user interface for accepting a request for removal processing of the external storage device and an execution means executing removal processing of the external storage device when it is determined that exception processing has occurred by the exception determination means.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an information processing device, an information processing method, and a program.

  In a host computer equipped with a Universal Serial Bus (USB) I / F, a USB storage, a USB card reader, or the like can be connected and used as one device of the host computer. When an external storage device such as a USB memory is connected and used, an operating system of a computer executes a process called mounting for connecting the connected external storage device to the system. By performing mounting, data can be read or written. When writing data to a USB memory, the write data is temporarily stored in a cache called a write cache.

  The USB memory can be easily attached and detached. However, if the USB memory is detached while data is being written, data in the USB memory may be destroyed. This can occur, for example, when the USB memory is removed while there is data that has not been written to the write cache. Therefore, the system performs a process called unmount for safely removing the USB memory. Executing the unmount makes the data in the USB memory consistent, and disconnects the USB memory from the system.

  Patent Literature 1 discloses a technique in which a plurality of applications independently request an operating system to mount and unmount an external storage device without requiring an explicit instruction from a user.

JP 2009-223699A

  Generally, when removing a USB memory, a user uses a user interface to instruct the device to unmount the USB memory. Then, the application that has received the instruction causes the operating system to execute the unmount processing. However, if the application that makes the unmount request stops due to an unexpected cause such as the occurrence of exception processing, there is a problem that the unmount processing cannot be performed.

  The present invention has been made in view of such a problem, and has an object to enable an external storage device to be appropriately detached from an information processing apparatus even when an application cannot make an unmount request. Aim.

  Therefore, the present invention is directed to an information processing apparatus to which an external storage device can be attached, wherein an exception related to the process is performed during execution of a process for controlling display of a user interface for receiving an instruction to remove the external storage device. An exception determining unit that determines whether a process has occurred; and an executing unit that executes an unmount process of the external storage device when the exception determining unit determines that the exception process has occurred. Features.

  According to the present invention, even when an application cannot make an unmount request, it is possible to appropriately remove the unit storage device from the information processing device.

FIG. 2 is a hardware configuration diagram of the image forming apparatus. FIG. 2 is a configuration diagram of a software module of the image forming apparatus. It is a figure showing an example of a display screen. It is a figure showing an example of a display screen. It is a flowchart which shows exception management processing. It is a flowchart which shows an unmount management process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a hardware configuration diagram of the image forming apparatus 1. Note that the image forming apparatus 1 is an example of an information processing apparatus. The CPU 101 controls the entire image forming apparatus 1. The system bus 102 connects the units. The HDD 103 stores various information and programs. Note that the image forming apparatus 1 may include a large-capacity nonvolatile memory such as a solid state drive (hereinafter, SSD) instead of, or in addition to, the HDD 103. The RAM 104 is used as a temporary storage area such as a main memory and a work area of the CPU 101. Note that functions and processes of the image forming apparatus 1 described later are realized by the CPU 101 reading a program stored in the HDD 103 or the like and executing the program.

  The network controller I / F 106 communicates with other devices on the network. The network controller 105 controls the network controller I / F 106. The USB host I / F 108 controls communication with a USB memory. The USB host I / F 108 is connected to a USB memory using a USB cable. However, as another example, the USB host I / F 108 may be directly connected to a USB memory without using a USB cable. The USB host controller 107 controls the USB host I / F 108. Although only one USB host I / F 108 is shown in FIG. 1, the image forming apparatus 1 has a plurality of USB host I / Fs. As described above, the image forming apparatus 1 can mount the USB memory. The USB memory is an example of an external storage device.

  The display 111 displays various information. The display 111 displays, for example, the operation status of the image forming apparatus 1. The display controller 110 controls the display 111. The input unit 113 receives an instruction from a user. The input unit 113 is, for example, a touch panel or a hard key. The input unit controller 112 controls the input unit 113.

  The clock (RCT) 114 is a clock function, and has an alarm function, a timer function, and the like. The nonvolatile memory 115 stores various information. The nonvolatile memory 115 may be a Static Random Access Memory (hereinafter, SRAM), an Electrically Erasable Programmable Read Only Memory (hereinafter, EEPROM), or the like. The scanner 117 reads an image. The scanner I / F 116 controls the scanner 117. The printer 119 forms an image. The printer I / F 118 controls the printer 119.

  FIG. 2 is a configuration diagram of a software module of the image forming apparatus 1. Each module illustrated in FIG. 2 is realized by the CPU 101. An operating system (OS) 201 manages hardware resources such as the CPU 101 and the RAM 104, and other software modules (hereinafter, processes) operate using resources allocated by the OS 201.

  The OS 201 performs a mounting process when the USB memory is connected to the image forming apparatus 1, and connects to the image forming apparatus 1 so that an application (process) can access the USB memory. The UI / Job execution process 202 is a process for displaying a user interface (UI) for accepting an instruction to remove a USB memory on the display 111 and executing a job such as printing or scanning. Here, mounting means that the OS 201 associates a physical device including a USB memory with a mount point managed by the file system. For example, an identifier is as follows. Assume that a device called / dev / usb1 is mounted on a mount point / media / usbdrive in a predetermined file system format. After mounting, the OS 201 can handle directories under / media / usbdrive as logical drives. When unmounting is performed, the mounted device is unmounted and detached from the file system.

  The exception handler registration process 203 has an exception handler that is executed when exception processing occurs, and has a function of registering an exception handler when another process requests the registration of an exception handler. The exception handling monitoring process 204 is a process for detecting that exception handling has occurred. The job management process 205 is a process for managing the execution order and job types of jobs executed by the UI / Job execution process 202.

  FIG. 3 is a diagram illustrating an example of the display screen 300 displayed on the display 111. The user can instruct execution of a function such as a printer or a scan by a touch operation on the display screen 300. When the USB memory is connected to the USB host I / F 108 and the mounting process is completed, an icon 301 is displayed on the display screen 300. The icon 301 is a button for instructing execution of the unmount processing. The user presses the icon 301 when the use of the USB memory is finished. When the icon 301 is pressed, a removal window 400 is superimposed on the display screen 300 as shown in FIG. The user can instruct the image forming apparatus 1 to remove the USB memory by selecting the memory medium to be removed from the memory medium list 401 and pressing the icon 402.

  FIG. 5 is a flowchart illustrating the exception management process. In step S <b> 501, the UI / Job execution process 202 requests the exception handler registration process 203 to register an exception handler, and registers an exception handler prepared in the exception handler registration process 203. Here, the exception handler is a process executed in response to a signal generated by the OS 201 when an unexpected process such as an illegal memory access occurs during the execution of the process. Registering an exception handler means specifying an exception handler. In the present embodiment, the exception handler registration process 203 registers an exception handler for signals of SIGSIGV, SIGILL, SIGFPE, SIGBUS, and SIGARBRT. Issuing signals of SIGSEV, SIGILL, SIGFPE, SIGBUS, and SIGARBR is an example of exception processing. Here, SIGSEV is a signal issued in response to an illegal memory access. SIGILL is a signal issued in response to an illegal instruction. SIGFPE is a signal issued in response to division by zero. SIGBUS is a signal issued in response to an address error or the like.

  In step S502, the exception handler registration process 203 monitors whether a registered signal has occurred. The exception handler registration process 203 waits until the registered signal is generated, and when a signal is generated (YES in S502), the process proceeds to S503. In step S503, the exception handler registration process 203 activates an exception handler. Next, in step S <b> 504, the exception handler registration process 203 writes the type of the generated signal, the name of the process in which the signal occurred, and the name of the task in an exception file on the RAM 104. Thus, the exception management processing ends.

  FIG. 6 is a flowchart showing the unmount management process. In step S601, the exception process monitoring process 204 performs polling for the exception file in the RAM 104 and reads the exception file. Next, in step S602, the exception handling monitoring process 204 determines whether exception handling has occurred by referring to the exception file. If an exception process has occurred (YES in S602), the exception process monitoring process 204 advances the process to 603. If no exception handling has occurred (NO in S602), the exception handling monitoring process 204 advances the processing to S601.

  In step S603, the exception handling monitoring process 204 determines whether the process in which the exception has occurred is the UI / Job execution process 202. If the exception process monitoring process 204 is the UI / Job execution process 202 (YES in S603), the process proceeds to S604. If the exception process monitoring process 204 is not the UI / Job execution process 202 (NO in S603), the process proceeds to S601. In step S604, the exception process monitoring process 204 determines whether there is a job being executed among the jobs of the UI / Job execution process 202. If there is a job being executed (YES in S604), the exception process monitoring process 204 advances the processing to S601. If there is no job being executed (NO in S604), the exception process monitoring process 204 advances the processing to S605. In step S605, the exception process monitoring process 204 instructs the OS 201 to perform an unmount process. In response, the OS 201 executes an unmount process. Note that the processing of S603 to S605 is an example of the exception determination processing. The process in S604 is an example of a job determination process.

  The OS 201 performs a process of writing cache data that has not been written to the external storage device and a process of releasing the connection with the system as an unmount process. The unmount command can be defined in the OS 201. The unmount process executed by the unmount command is also used to separate the external storage device from the logical hierarchical structure managed by the OS 201. When the unmount process is executed, the unmounted external storage device cannot be accessed via the OS 201 in principle. As a result, the image forming apparatus 1 is in a state where the external storage device can be appropriately removed.

  As described above, during the execution of the UI / Job execution process, the image forming apparatus 1 automatically performs the unmount process when the exception process related to the UI / Job execution process occurs. As a result, it is possible to prevent the user from being unable to input an instruction to execute the unmount process because the UI for removing the USB memory, which should be displayed by the UI / Job execution process, cannot be displayed. That is, even when the application cannot make an unmount request, the USB memory can be properly removed.

  Further, even when an exception process occurs during the execution of the UI / Job execution process, some jobs of the UI / Job execution process may continue to execute. In this case, there is a possibility that the USB memory is accessed by the job being executed. Therefore, in this case, the image forming apparatus 1 of the present embodiment does not perform the unmount processing. As a result, it is possible to prevent the unmount processing from being executed during access to the USB memory.

  As another example, when there is a job being executed (YES in S604), the exception process monitoring process 204 further determines whether the job being executed is a job that requires access to the USB memory. May be. Then, the exception process monitoring process 204 may instruct unmount processing when access to the USB memory is not involved (S605), and may proceed to S601 when access to the USB memory is involved.

  As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the specific embodiments, and various modifications may be made within the scope of the present invention described in the appended claims.・ Change is possible.

  The present invention supplies a program for realizing one or more functions of the above-described embodiments to a system or an apparatus via a network or a storage medium, and one or more processors in a computer of the system or the apparatus read and execute the program. This processing can be realized. Further, it can also be realized by a circuit (for example, an ASIC) that realizes one or more functions.

1 OS of image forming apparatus 201
202 UI / Job execution process 204 Exception process monitoring process

Claims (6)

An information processing device to which an external storage device can be attached,
During a process of controlling the display of a user interface for receiving an instruction to remove the external storage device, during execution of a process, an exception determination unit that determines whether or not exceptional processing related to the process has occurred.
An information processing apparatus comprising: an execution unit that executes an unmount process of the external storage device when the exception determination unit determines that the exception process has occurred. A job determination unit that determines whether a job included in the process is being executed;
2. The information processing apparatus according to claim 1, wherein the execution unit executes the unmount processing when it is determined that the exception processing has occurred and it is determined that a job is being executed. The job determination unit determines whether or not a job included in the process, and a job including access to the external storage device is being executed,
The execution unit executes the unmount process when it is determined that the exception process has occurred and when it is determined that a job including access to the external storage device is being executed. Item 3. The information processing device according to item 2. A registration unit for registering the exception processing,
4. The information processing apparatus according to claim 1, wherein the exception determination unit determines whether the exception process registered by the registration unit has occurred. 5. An information processing method executed by an information processing device to which an external storage device can be attached,
During a process of controlling the display of a user interface for receiving an instruction to remove the external storage device, during an execution of a process, an exception determination step of determining whether or not exceptional processing related to the process has occurred;
An execution step of executing an unmount process of the external storage device when it is determined in the exception determination step that the exception process has occurred.   A program for causing a computer to function as each unit of the information processing apparatus according to claim 1.

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