initial commit

Makefile

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+main: main.c
+	gcc -pedantic -Wall -o main main.c

README.md

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+# Simple Fork Example
+A simple example using fork() in C.
+
+## Compile
+```bash
+make
+```
+## Run 
+```bash
+./main
+``` 

main.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  main.c
+ *
+ *    Description: basic example of multi processing with fork() 
+ *
+ *        Version:  1.0
+ *        Created:  06/03/2020 01:54:39 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  Leon Löchner 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define NUM_PROCESS 3
+
+void errExit(char* msg){
+	perror(msg);
+	exit(EXIT_FAILURE);
+}
+
+int main(){
+	pid_t *pids = malloc(NUM_PROCESS * sizeof(pid_t));
+	for (int i = 0 ; i < NUM_PROCESS ; i++){
+		pids[i] = fork();
+		if (pids[i] < 0){
+			errExit("fork failed");
+		}
+		if (pids[i] == 0 ){
+			printf("child is running...\n");
+			sleep(10);
+			exit(0);
+		}
+	}
+	printf("parent waiting for children...\n");
+	int status, pid;
+	while ((pid = wait(&status)) > 0){
+		printf("child process %d terminated with status %d\n", pid, WEXITSTATUS(status));
+	}
+}