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[BasicOS] Fundamentals in Operating Systems (APVRILLE, Ludovic)

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Which following claims are correct? Thee claims are related to the differences between system calls and functions of libraries.

Function of libraries cannot call memory allocations routines while system calls can

❌

The manual pages of system calls are listed in a different section than the ones of library functions

✅

System calls can execute privileged assembly instructions but functions of libraries cannot

✅

There are more system calls than functions of libraries

❌

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Check all the correct claims which concern the code below.

The following code makes it

possible to exchange signals between a sender and a receiver. We assume

that the receiver is started a few seconds before the sender. Also, the

command line to start the sender provides the process id of receiver.

Last but not least, we assume that all works as

expected (no process is killed during execution, etc.)

Receiver code:

void getSignal(int signo) {

if (signo == SIGUSR1) {

printf("Received SIGUSR1\n");

} else {

printf("Received%d\n", signo);

}

int main(void)

{

printf("Registering SIGUSR1 signal / #SIGUSR1=%d\n", SIGUSR1);

signal(SIGUSR1, getSignal);

sleep(30);

}

Sender code:

int main(int argc, char**argv) {

int pid;

if (argc <2) {

printf("Usage: sender <destination process pid>\n");

exit(-1);

}

pid = atoi(argv[1]);

printf("Sending SIGURG to %d\n", pid);

kill(pid, SIGURG);

printf("Sending SIGUSR1 to %d\n", pid);

kill(pid, SIGUSR1);

printf("Sending SIGUSR1 to %d\n", pid);

kill(pid, SIGUSR1);

}

The return values of all system calls are checked for errors

getSignal() is called one time

✅

If SIGKILL were to be sent at first by sender instead of SIGURG, the behavior of receiver would be the same.

getSignal() is called two times

❌

getSignal() is called three times

❌

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