Types of System Calls

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Process control

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 end, abort
 load, execute
 create process, terminate process
 get process attributes, set process attributes
 wait for time
 wait event, signal event
 allocate and free memory

File management

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 create file, delete file
 open, close file
 read, write, reposition
 get and set file attributes

Process control

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 end, abort
 load, execute
 create process, terminate process
 get process attributes, set process attributes
 wait for time
 wait event, signal event
 allocate and free memory

File management

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 create file, delete file
 open, close file
 read, write, reposition
 get and set file attributes

Device management

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 request device, release device
 read, write, reposition
 get device attributes, set device attributes
 logically attach or detach devices

Information maintenance

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 get time or date, set time or date
 get system data, set system data
 get and set process, file, or device attributes

Communications

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 create, delete communication connection
 send, receive messages
 transfer status information
 attach and detach remote devices

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