It is the system in which user can do manipulation of data, edit, reuse, mashup and alter the content in the programming system. In other words, we can say that open system is that system which access anyone without any restriction it means here authorization of user is not necessary. It is basically computer system which includes interoperability and portability etc. UNIX is an example of open system, it can be modify and collaborate.
It is open system and supports API. It basically works on File management, Process management, and error handling. In file management it helps in making and creation of new file, editing and reusing of files.
It is type of system call process in which creating, editing and altering the data processes are done. Like disk-based files, terminals, printers, and interprocess communication facilities like pipes and sockets.
Command to use and access any file is :
Int fd; /* File descriptor */
Fd = open(filename,…); /* Open file
Read(fd,…..); /* read from file */
$ cc revese.c -o reverse ---> compile the program.
$ cat test ---> list the test file.
In unix system some attributes are used for each and every process such as codes (a.k.a. text), data, stack, unique process ID num (PID). And each and every process have six possible states:
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