⟩ Which of the following enables multi-tasking in UNIX? a) Time Sharing b) Multi programming c) Multi user d) Modularity
a) Time Sharing
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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);
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umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
fd2 = open("file2", O_CREAT | O_RDWR, PERMS)
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The newly created files file1 and file2 will have the permissions respectively
a) rw-rw-rw- r---
b) r--- rw-rw-rw-
c) rw-rw-rw- rw---
d) None of the aboveWhat is stored in logfile as per below mentioned code if we execute ./a.out > logfile?
int main() {
int fd;
close(1);
fd = open("logfile",O_RDWR, 0744);
write(fd, "Hello", 5);
printf("Worldn");
return 0;
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a) Hello
b) HelloWorld
c) World
d) None
