Linux OS Management Question:

Which function can be used instead of the dup2 to duplicate the file descriptor?
a) read()
b) open()
c) stat()
d) fcntl()

Linux Operating System Management Interview Question
Linux Operating System Management Interview Question

Answer:

d) fcntl()


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If one of the thread in multi-threaded process is blocked on an I/O, which of the following is true?
a) The entire process with block if their is no kernel supported threads
b) Other threads of the process will continue to execute even if there is no kernel supported threads
c) It depends on specific implementatation
d) All of the above		Below is the code:

int main() {
int fd1, fd2;
struct stat buff1, buff2;
fd1 = open("1.txt", O_RDWR);
fd2 = open("2.txt", O_RDWR | O_APPEND);
lseek(fd1, 10000, SEEK_SET);
write(fd1, "abcdefghij", 10);
write(fd2, "abcdefghij", 10);
fstat(fd1, &buff1);
fstat(fd2, &buff2);
printf(" %d %d", buff1.st_size, buff2.st_size);
return 0;
}

Before running the program, the file 1.txt and 2.txt size is 20 each. What is the output?
a) 30 30
b) 100020 20
c) 100030 30
d) 100010 30