Describe in details the system calls (operating services) that must be used to implement file copying (file copy, Windows/MSDOS: copy source_file destination_file, Linux/Unix: cp source_file destination_file), and what must be met for the copy operation to take place ?
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Describe in details the system calls (operating services) that must be used to implement file copying (file copy, Windows/MSDOS: copy source_file destination_file, Linux/Unix: cp source_file destination_file), and what must be met for the copy operation to take place ?
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- Compilers and assemblers are responsible for turning source files into files containing object code. First, the object files need to be linked together before they can be executed. Compilers have the potential to produce final executable files even in the absence of linking. What are some of the problems associated with using the second approach?UNIX-like operating system use two internal tables to keep track of open files – the per-process file descriptor table and the system-wide file table. Suppose on a UNIX-like operating system, process A has two files open and process B has three files open. Two files are shared between the two processes. How many entries are in the per-process table of process A, the per-process table of process B, and the system-wide tables respectively? A. 5, 5, 5 B. 2, 3, 3 C. 2, 3, 5 D. 2, 3, 1PostgreSQL normally uses a small buffer, leaving it to the operating systembuffer manager to manage the rest of main memory available for file system buffering. Explain (a) what is the benefit of this approach, and (b) one key limitation of this approach
- Please describe the shmat system function, including what a shared memory file is, how a process is generated, and why such a call is necessary.Named pipe is for a bidirection communication. A named pipe (also known as a FIFO) is one of the methods for inter-process communication. Usually a named pipe appears as a file and generally processes attach to it for inter-process communication. A FIFO file is a special kind of file on the local storage which allows two or more processes to communicate with each other by reading/writing to/from this file. A FIFO special file is entered into the file system by calling mkfifo() in C. Once we have created a FIFO special file in this way, any process can open it for reading or writing, in the same way as an ordinary file. The following code is for the code file namedpipe_p1.c. // This process writes first, then reads #include <stdio.h> #include <string.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/types.h> #include <unistd.h> int main() { int fd; // FIFO file path char * myfifo = "./myfifo"; // Creating the named…What is the best file system property, the long-term exixtence, sharable between processes or good internal structure? why?
- You are developing a system that stores its data on a Unix file system. You anticipate that you will port future versions of the system to other operating systems that provide different file systems. Propose a subsystem decomposition that anticipates this change.To what extent is an operating system designed to accomplish these two primary goals, as well as its two separate modes of operation? To be more explicit, what is the most critical job that the file system plays?What are the benefits and drawbacks of a batch system with direct file access?
- Compilers and Assemblers translate each source file individually to generate object code files. Hence the object files need to be linked together before they can be executed. Theoretically, however, it is possible to skip the linking step and directly have compilers generate the final executable file. What would be the down side of taking the latter approach?The system wide open-file table is used to maintain information about files that are currently open. Should the operating system maintain a separate table for each user or just maintain one table that contains references to files that are being accessed by all users at the current time? If two different programs or users are accessing the same file, should there be separate entries in the open file table?Explain in your own words the differences between the file management capabilities and the process management features that are given by operating systems in medical computer systems and/or embedded systems.