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‎Programs/10a.py

+18
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import os
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rows, columns = os.popen('stty size', 'r').read().split()
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r=int(rows)
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c=int(columns)
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n = int(input("Enter number of rows:"))
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for i in range(int(r/2-n/2)):
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print()
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for i in range(n):
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for k in range(int(c/2)-int(n/2)):
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print(" ",end="")
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for k in range(n-i-1):
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print(" ",end="")
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for k in range(2*i+1):
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print("*",end="")
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print("\n",end="")
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for i in range(int(r/2-n/2)):
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print()
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‎Programs/10b.py

+10
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lower = int(input("Enter lower range: "))
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upper = int(input("Enter upper range: "))
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for num in range(lower,upper + 1):
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if num > 1:
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for i in range(2,num):
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if (num % i) == 0:
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break
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else:
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print(num)

‎Programs/1b

16.4 KB
Binary file not shown.

‎Programs/1b.c

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#include<stdio.h>
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#include<stdlib.h>
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#include<unistd.h>
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int main()
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{
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char *args[]={"./EXEC",NULL};
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execvp(args[0],args);
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printf("Ending\n");
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return 0;
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}
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‎Programs/1c.c

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/*#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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int main()
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{
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fork();
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printf("Hello world!\n");
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return 0;
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}
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*//*
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#include <stdio.h>
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#include <sys/types.h>
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#include <unistd.h>
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void forkexample()
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{
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if (fork() == 0)
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printf("Hello from Child!\n");
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else
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printf("Hello from Parent!\n");
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}
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int main()
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{
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forkexample();
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return 0;
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}
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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int main()
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{
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int n =10;
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pid_t pid = vfork();
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if (pid == 0)
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{
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printf("Child process started\n");
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}
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else
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{
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printf("Now i am coming back to parent process\n");
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}
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printf("value of n: %d \n",n);
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return 0;
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}

‎Programs/1d.c

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1+
#include<stdlib.h>
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#include<stdio.h>
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#include<unistd.h>
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#include<sys/wait.h>
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void main()
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{
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pid_t id=fork();
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if(id==0)
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{
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printf("Child Process Started..ProcessID = %d\n", getpid());
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printf("In Child\n");
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for(int i=0;i<5;i++)
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{
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printf("In Child : %d\n",i);
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}
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printf("Child Finished\n");
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exit(0);
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}
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else
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{
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printf("Parent Process Started..ProcessID = %d\n", getpid());
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printf("In Parent\n");
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printf("Parent waiting\n");
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wait(NULL);
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printf("Parent Resumed\n");
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for(int i=0;i<5;i++)
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{
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printf("In parent : %d\n",i);
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}
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printf("Parent Finished\n");
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}
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}

‎Programs/1e.c

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#include<stdio.h>
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#include<stdlib.h>
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int main()
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{
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char str[256], buf[256];
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printf("Enter command ");
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scanf("%s",str);
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sprintf(buf, "/bin/sh -c %s", str);
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system(buf);
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return 0;
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}

‎Programs/2a.c

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1+
#include<signal.h>
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#include<stdio.h>
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#include<unistd.h>
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#include<stdbool.h>
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#include<stdlib.h>
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bool flag=false;
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void alarmhandle(int sig)
8+
{
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printf("Input time expired\n");
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exit(1);
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}
12+
int main()
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{
14+
int a=0;
15+
printf("Input now in 10 seconds\n");
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sleep(1);
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alarm(10);
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signal(SIGALRM,alarmhandle);
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scanf("%d",&a);
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printf("You entered %d\n",a);
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}

‎Programs/2b.c

+52
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1+
#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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void sighup();
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void sigint();
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void sigquit();
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void main()
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{
11+
int pid;
12+
13+
if ((pid = fork()) < 0) {
14+
perror("fork");
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exit(1);
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}
17+
if (pid == 0) {
18+
signal(SIGHUP, sighup);
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signal(SIGINT, sigint);
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signal(SIGQUIT, sigquit);
21+
for (;;) ;
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}
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else
24+
{
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printf("\nPARENT: sending SIGHUP\n\n");
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kill(pid, SIGHUP);
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sleep(3);
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printf("\nPARENT: sending SIGINT\n\n");
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kill(pid, SIGINT);
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sleep(3);
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printf("\nPARENT: sending SIGQUIT\n\n");
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kill(pid, SIGQUIT);
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sleep(3);
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}
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}
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37+
38+
void sighup()
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{
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signal(SIGHUP, sighup);
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printf("CHILD: I have received a SIGHUP\n");
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}
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void sigint()
44+
{
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signal(SIGINT, sigint);
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printf("CHILD: I have received a SIGINT\n");
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}
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void sigquit()
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{
50+
printf("My DADDY has Killed me!!!\n");
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exit(0);
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}

‎Programs/2c.c

+50
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1+
#include <stdio.h>
2+
#include <sys/types.h>
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#include <signal.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include<stdlib.h>
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#include<unistd.h>
8+
void SIGINT_handler(int);
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void SIGQUIT_handler(int);
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int ShmID;
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pid_t *ShmPTR;
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void main(void)
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{
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int i;
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pid_t pid = getpid();
16+
key_t MyKey;
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if (signal(SIGINT, SIGINT_handler) == SIG_ERR) {
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printf("SIGINT install error\n");
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exit(1);
20+
}
21+
if (signal(SIGQUIT, SIGQUIT_handler) == SIG_ERR) {
22+
printf("SIGQUIT install error\n");
23+
exit(2);
24+
}
25+
MyKey = ftok(".", 's');
26+
ShmID = shmget(MyKey, sizeof(pid_t), IPC_CREAT | 0666);
27+
ShmPTR = (pid_t *) shmat(ShmID, NULL, 0);
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*ShmPTR = pid;
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for (i = 0; ; i++) {
30+
printf("From process %d: %d\n", pid, i);
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sleep(1);
32+
}
33+
}
34+
void SIGINT_handler(int sig)
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{
36+
signal(sig, SIG_IGN);
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printf("From SIGINT: just got a %d (SIGINT ^C) signal\n",
38+
sig); signal(sig, SIGINT_handler);
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}
40+
void SIGQUIT_handler(int sig)
41+
{
42+
signal(sig, SIG_IGN);
43+
printf("From SIGQUIT: just got a %d (SIGQUIT ^\\) signal"
44+
" and is about to quit\n",
45+
sig); shmdt(ShmPTR);
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shmctl(ShmID, IPC_RMID, NULL);
47+
exit(3);
48+
}
49+
50+

‎Programs/3a.c

+58
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1+
#include<stdio.h>
2+
3+
#include<unistd.h>
4+
5+
#include<sys/types.h>
6+
7+
#include<sys/stat.h>
8+
9+
int main(int argc, char **argv)
10+
11+
{
12+
13+
struct stat fileStat;
14+
15+
stat("/home/sumit/Documents/UOS/abc.txt",&fileStat);
16+
17+
if(stat("/home/sumit/Documents/UOS/abc.txt",&fileStat) < 0)
18+
19+
{
20+
21+
printf("Failed\n");
22+
23+
return 1;
24+
25+
}
26+
27+
printf("---------------------------\n");
28+
29+
printf("File Size: \t\t%ld bytes\n",(long)fileStat.st_size);
30+
31+
printf("Number of Links: \t%ld\n",(long)fileStat.st_nlink);\
32+
printf("File inode: \t\t%ld\n",(long)fileStat.st_ino);
33+
34+
printf("File Permissions: \t");
35+
36+
37+
38+
printf( (S_ISDIR(fileStat.st_mode)) ? "d" : "-");
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40+
printf( (fileStat.st_mode & S_IRUSR) ? "r" : "-");
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printf( (fileStat.st_mode & S_IWUSR) ? "w" : "-");
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44+
printf( (fileStat.st_mode & S_IXUSR) ? "x" : "-");
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46+
printf( (fileStat.st_mode & S_IRGRP) ? "r" : "-");
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48+
printf( (fileStat.st_mode & S_IWGRP) ? "w" : "-");
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50+
printf( (fileStat.st_mode & S_IXGRP) ? "x" : "-");
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52+
printf( (fileStat.st_mode & S_IROTH) ? "r" : "-");
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54+
printf( (fileStat.st_mode & S_IWOTH) ? "w" : "-"); printf( (fileStat.st_mode & S_IXOTH) ? "x" : "-"); printf("\n\n");
55+
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printf("The file %s a symbolic link\n", (S_ISLNK(fileStat.st_mode)) ? "is" : "is not"); return 0;
57+
58+
}

‎Programs/3b.c

+63
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1+
#include<stdio.h>
2+
#include<stdlib.h>
3+
#include <sys/stat.h>
4+
#include <sys/types.h>
5+
#include <unistd.h>
6+
int main()
7+
{
8+
char s[100];
9+
gets(s);
10+
//printf("%s",s);
11+
FILE *fp;
12+
if((fp=fopen(s,"r"))==NULL)
13+
return 1;
14+
int fn=0;
15+
fn=fileno(fp);
16+
struct stat sta;
17+
if(fstat(fn,&sta) < 0) return 1;
18+
printf("File size : %ld\n",(long)sta.st_size);
19+
printf("File INode Number : %ld\n",sta.st_ino);
20+
printf("File UID : %ld\n",(long)sta.st_uid);
21+
printf("File GID : %ld\nA",(long)sta.st_gid);
22+
printf("File Permissions: \t");
23+
printf( (S_ISDIR(sta.st_mode)) ? "d" : "-");
24+
printf( (sta.st_mode & S_IRUSR) ? "r" : "-");
25+
printf( (sta.st_mode & S_IWUSR) ? "w" : "-");
26+
printf( (sta.st_mode & S_IXUSR) ? "x" : "-");
27+
printf( (sta.st_mode & S_IRGRP) ? "r" : "-");
28+
printf( (sta.st_mode & S_IWGRP) ? "w" : "-");
29+
printf( (sta.st_mode & S_IXGRP) ? "x" : "-");
30+
printf( (sta.st_mode & S_IROTH) ? "r" : "-");
31+
printf( (sta.st_mode & S_IWOTH) ? "w" : "-");
32+
printf( (sta.st_mode & S_IXOTH) ? "x" : "-");
33+
printf("\n\n");
34+
printf("File type: ");
35+
switch (sta.st_mode & S_IFMT)
36+
{
37+
case S_IFBLK:
38+
printf("block device\n");
39+
break;
40+
case S_IFCHR:
41+
printf("character device\n");
42+
break;
43+
case S_IFDIR:
44+
printf("directory\n");
45+
break;
46+
case S_IFIFO:
47+
printf("FIFO/pipe\n");
48+
break;
49+
case S_IFLNK:
50+
printf("symlink\n");
51+
break;
52+
case S_IFREG:
53+
printf("regular file\n");
54+
break;
55+
case S_IFSOCK:
56+
printf("socket\n");
57+
break;
58+
default:
59+
printf("unknown?\n");
60+
break;
61+
}
62+
return 0;
63+
}

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