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22.
What is the output of this program?
#include<stdio.h>

int main()
{
    int fd_socket;
    fd_socket = socket(AF_UNIX,SOCK_STREAM,0);
    printf("%d\n",fd_socket);
    return 0;
}

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29.
What is the output of this program?
#include<stdio.h>
#include<pthread.h>
#include<semaphore.h>
 
sem_t st;
void *fun_t(void *arg);
void *fun_t(void *arg)
{
    pthread_exit("Bye");
}
int main()
{
    pthread_t pt;
    void *res_t;
    if(pthread_create(&pt,NULL,fun_t,NULL) == -1)
        perror("pthread_create");
    if(sem_init(st,1,2) != 0)
        perror("sem_init");
    if(pthread_join(pt,&res_t) == -1)
        perror("pthread_join");
    if(sem_destroy(&st) != 0)
        perror("sem_destroy");
    return 0;
}

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30.
This program will print . . . . . . . . as output.
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
 
int main()
{
    pid_t child;
    child = fork();
    switch(child){
        case -1 :
            perror("fork");
            exit(1);
        case 0 :
            sleep(10);
            printf("%d\n",getppid());
            break;
        default :
            break;
    }
   return 0;
}

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