From e479d5f7396a50af2b8234c960c869a492f183a1 Mon Sep 17 00:00:00 2001
From: Xike Wang <zekewang918@gmail.com>
Date: Fri, 26 Sep 2014 21:27:53 -0300
Subject: [PATCH] Fix #3: Make mm.c fork(), parent call mean() and child call
 median()

---
 mm    | Bin 8848 -> 8976 bytes
 mm.c  |  31 ++++++++++++++++++++++++++-----
 mm.c~ |  40 +++++++++++++++++++++++++++++++++++++---
 3 files changed, 63 insertions(+), 8 deletions(-)

diff --git a/mm b/mm
index 7f02c880b4540474dbc460c01207346b2828f5ed..5fb1da54a51fc67184396bc3bbb590be6b73686f 100755
GIT binary patch
delta 1576
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delta 1106
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diff --git a/mm.c b/mm.c
index 8d60c00..9306ab1 100644
--- a/mm.c
+++ b/mm.c
@@ -1,7 +1,14 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #define debug 0
+#define FAILED 1
+
+// Declare Function
+int numcmp (const void *a, const void *b);
+float mean(int *num, int length);
+float median(int *num, int length);
 
 // Comparison function for qsort()
 int numcmp (const void *a, const void *b) {
@@ -30,12 +37,12 @@ float mean(int *num, int length) {
 // Median function that outputs median
 float median(int *num, int length){
   // If the length of array is even
-  if(length%2==0){
+  if (length%2==0){
     //return the average number between two median numbers
     return (num[length/2-1]+num[length/2])/(float)2;
   // If the length of array is odd 
   }else{
-    // Return the median
+  // Return the median
     return num[length/2+1];
   }
 }
@@ -74,10 +81,24 @@ int main(int argc, char *argv[]) {
     for (i=0; i<length; i++) {
         fprintf(stdout, "%d ", pt[i]);
     }
+    
+    // Initilaztion fork() for process
+    int rc = fork();
 
-    fprintf(stdout, "\nMean: %f", mean(pt, length));
-    fprintf(stdout, "\nMedian: %f", median(pt, length));
-    fprintf(stdout, "\n%s: FIN. \n", argv[0]);
+    // If there is no arugment
+    if (rc < 0){
+      fprintf(stderr, "Fork Failed %s\n", argv[0]);
+      exit(FAILED);
+    // If the process is child
+    } else if (rc == 0){
+      fprintf(stdout, "This is child process(pid:%d)\n", (int)getpid());
+      fprintf(stdout, "The median is: %f", median(pt, length));
+    // If the process is parent
+    } else if (rc > 0){
+      fprintf(stdout, "This is parent prcesss(pid:%d)", (int)getpid());
+      fprintf(stdout, "The mean is: %f", mean(pt, length));
+      fprintf(stdout, "\n%s: FIN. \n",argv[0]);
+    }
 
     return 0;
    
diff --git a/mm.c~ b/mm.c~
index 6c2b9bd..61ca529 100644
--- a/mm.c~
+++ b/mm.c~
@@ -1,7 +1,14 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <unistd.h>
 
 #define debug 0
+#define FAILED 1
+
+// Declare Function
+int numcmp (const void *a, const void *b);
+float mean(int *num, int length);
+float median(int *num, int length);
 
 // Comparison function for qsort()
 int numcmp (const void *a, const void *b) {
@@ -12,19 +19,30 @@ int numcmp (const void *a, const void *b) {
     return 0;
 }
 
+//Mean functiont that outputs mean of an array
 float mean(int *num, int length) {
+  // Initialization of vars
+  // sum -> sum of ints of array
+  // i -> num used for doing iteation
   float sum = 0;
   int i;
+  // For loop to add every number to sum
   for(i=0; i<length;i++){
     sum += num[i];
   }
+  // Return mean
   return sum/length;
 }
 
+// Median function that outputs median
 float median(int *num, int length){
-  if(length%2==0){
+  // If the length of array is even
+  if (length%2==0){
+    //return the average number between two median numbers
     return (num[length/2-1]+num[length/2])/(float)2;
+  // If the length of array is odd 
   }else{
+  // Return the median
     return num[length/2+1];
   }
 }
@@ -63,9 +81,25 @@ int main(int argc, char *argv[]) {
     for (i=0; i<length; i++) {
         fprintf(stdout, "%d ", pt[i]);
     }
+    
+    // Initilaztion fork() for process
+    int rc = fork();
 
-    fprintf(stdout, "\nMean: %f", mean(pt, length));
-    fprintf(stdout, "\nMedian: %f", median(pt, length));
+    // If there is no arugment
+    if (rc < 0){
+      fprintf(stderr, "Fork Failed %s\n", argv[0]);
+      exit(FAILED);
+    // If the process is child
+    } else if (rc == 0){
+      fprintf(stdout, "This is child process(pid:%d)\n", (int)getpid());
+      fprintf(stdout, "The median is: %f", median(pt, length));
+    // If the process is parent
+    } else if (rc > 0){
+      fprintf(stdout, "This is parent prcesss(pid:%d)", (int)getpid());
+      fprintf(stdout, "The mean is: %f", mean(pt, length));
+    }
+    
+    // Print FIN
     fprintf(stdout, "\n%s: FIN. \n", argv[0]);
 
     return 0;