Application developers often do not have direct access to the mechanism calls, butcan accessibility them with an application programming user interface (API).The functions that are had in the API invoke the actual system calls.By utilizing the API, particular benefits have the right to be gained:

Portability: as long a system supports one API, any kind of program utilizing that API cancompile and run.Ease of Use: utilizing the API can be considerably easier than using the actualsystem call.

You are watching: Three general methods for passing parameters to the operating system


1.13.1. System call Parameters¶

Three general methods exist because that passing parameters come the OS:

Parameters can be passed in registers.When there are more parameters 보다 registers, parameters deserve to bestored in a block and also the block resolve can it is in passed as aparameter to a register.Parameters can additionally be thrust on or popped off the ridge by theoperating system.
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1.13.2. Types of device Calls¶

There room 5 various categories of device calls:process control, record manipulation, an equipment manipulation,information maintenance, and communication.

1.13.2.1. Procedure Control¶

A to run program demands to be able to stop execution either usually orabnormally. Once execution is stopped abnormally, regularly a recording of memory istaken and can be examined v a debugger.


1.13.2.2. Document Management¶

Some usual system calls room create, delete, read, write,reposition, or close. Also, there is a need to determine the fileattributes – get and set record attribute.Many time the OS provides an API to make these device calls.


1.13.2.3. Device Management¶

Process usually call for several sources to execute, if these sources areavailable, they will certainly be granted and control returned to the user process.These sources are additionally thought of together devices. Some are physical, such together avideo card, and also others are abstract, such together a file.

User program request the device, and when perfect they release thedevice. Similar to files, we can read, write, and reposition the device.


1.13.2.4. Info Management¶

Some device calls exist purely for transferring information between the userprogram and the operation system. An instance of this is time, or date.

The OS additionally keeps information around all that is processes and provides device callsto report this information.


1.13.2.5. Communication¶

There are two models of interprocess communication, the message-passing modeland the mutual memory model.

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Message-passing uses a usual mailbox to pass messages between processes.Shared memory use details system calls to create and gain access to createand gain accessibility to areas of storage owned by various other processes. The twoprocesses exchange info by reading and also writing in the mutual data.

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Table that Contents

1.13. Device Calls1.13.2. Types of mechanism Calls Previous topic

1.12. The Operating device Environment