Simple program to create Zombie @ Linux

shiv@ubuntu:~/ds/unix$ cat zmb.c
/*
* simple program to create a Zombie
* ps command display Zombie with Z under flags in ps output
*/

#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>

int main()
{
pid_t pid;

/* create child process */
pid=fork();

if(pid == 0){
   /* child process exits and becomes Zombie
    */
   exit(0);
}

sleep(20);
printf("Done ....\n");
return 0;

}

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C Program to Simulate Linux Cat command

/* * C program to Simulate Implementation of Linux *cat* command * This program will not handle redirection * you can try to improve this program to handle redirection of file contents */ #include<stdio.h> #include<string.h> #define MAX_FILE_NAME_CHARS 255 int main(int argc, char *argv[]) { FILE *fp; char file_name[MAX_FILE_NAME_CHARS], ch; int i; /* * after creating a.out, rename it as mycat for our own cat command * and it usage is same as standard cat command */ if(argc<1){ printf("Usage mycat <filename> \n"); return 0; } /* * cat handles more than one file * so we need this loop to handle all the files provided * on command line */ for(i=1; i<=argc;i++){ /* no need of copy but for understanding purpose, i have created * string for each file name */ strncpy(file_name, argv[i], MAX_FILE_NAME_CHARS); fp=fopen(file_name, "r"); if(fp == NULL) {

simple program to create Orphan process

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Interactive C program to implement stack using doubly linked list

shiv@ubuntu:~/ds/stack$ cat stack.c /* * Copy right by Shiv Yaragatti * you are free to use, modify and redistribute code on own risk * Interactive C Program to implement STACK using Doubly linked list */ #include "header.h" struct stack { int data; struct stack *next; struct stack *prev; }; typedef struct stack *S; /*Push elements in to stack */ void push(S *stack) { int e; S temp; temp=malloc(sizeof(struct stack)); if(!temp){ printf("Can't allocate memory\n"); return; } printf("Enter element to push\n"); scanf("%d", &e); temp->data=e; if(*stack == NULL){ temp->next = temp->prev = NULL; *stack=temp; } else { temp->next = *stack; (*stack)->prev = temp; temp->prev = NULL; *stack=temp; } } /* Display elements in the stack */ void display(S s){ S temp; temp=s; printf("Elements are ...\n"); while(temp) { printf("%d\n", temp->data

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