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Dear candidates you will find MCQ questions of Operating System Architecture here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
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Q. 431) What is the use of fcntl function?
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Q. 432) Which function can be used instead of the dup2 to duplicate the file descriptor?
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Q. 434) read() system call on success returns
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Q. 435) Which system call is used to create a hard link?
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Q. 438) What is stored in logfile as per below mentioned code if we execute ./a.out > logfile?nt main() {
int fd; close(1);
fd = open(“logfile”,O_RDWR, 0744); write(fd, “Hello”, 5); printf(“World\n”);
return 0;
}
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Q. 439) For the below mentioned codeint main() { int fd;
fd = open(“logfile”, O_CREAT|O_RDWR, 0600);
lseek(fd, 5, SEEK_CUR);
write(fd, “Hello”, 5);
return 0;
},
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Q. 440) Given a code snippet below? #define PERMS (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
int main() { int fd1, fd2; umask(0);
fd1 = open(“file1”, O_CREAT | O_RDWR, PERMS)
umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fd2 = open(“file2”, O_CREAT | O_RDWR, PERMS)
return 0;
}
The newly created files file1 and file2 will have the permissions respectively
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