From e2a806a832ce40976b1a52f19ebc48366dd3f05a Mon Sep 17 00:00:00 2001
From: Matt Strapp <strap012@umn.edu>
Date: Tue, 6 Oct 2020 19:32:32 -0500
Subject: Add more error handling

---
 P1/src/mapreduce.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/P1/src/mapreduce.c b/P1/src/mapreduce.c
index cb171bb..8243e17 100644
--- a/P1/src/mapreduce.c
+++ b/P1/src/mapreduce.c
@@ -26,6 +26,9 @@ int main(int argc, char *argv[]) {
 		//send chunks of data to the mappers in RR fashion
 		sendChunkData(inputFile, nMappers);
 		exit(0);
+	} else if (pid == -1) {
+		printf("Fork failed!\n");
+		return 1;
 	}
 	sleep(1);
 
@@ -38,13 +41,13 @@ int main(int argc, char *argv[]) {
 			sprintf(numMap, "%d", i);
 			execl("./mapper", "./mapper", &numMap, NULL);
 			printf("Mapper execution failed! Make sure \"mapper\" exists in the directory.\n");
-			return 4;
+			return 2;
 		} else if (mapperPid == -1) {
 			printf("Fork failed!\n");
 			return 1;
 		}
 	}
-	
+
     for (int i = 0; i <= nMappers; i++) {
 		int waitError = wait(NULL);
 		if (waitError == -1)
@@ -53,7 +56,6 @@ int main(int argc, char *argv[]) {
 			return 5;
 		}
 	}
-
 	// ###### DO NOT REMOVE ######
     // shuffle sends the word.txt files generated by mapper 
     // to reducer based on a hash function
@@ -61,6 +63,9 @@ int main(int argc, char *argv[]) {
 	if(pid == 0){
 		shuffle(nMappers, nReducers);
 		exit(0);
+	} else if (pid == -1) {
+		printf("Fork failed!\n");
+		return 1;
 	}
 	sleep(1);
 
@@ -73,10 +78,10 @@ int main(int argc, char *argv[]) {
 			sprintf(numRed, "%d", i);
 			execl("./reducer", "./reducer", &numRed, NULL);
 			printf("Reducer execution failed! Make sure \"reducer\" exists in the directory.\n");
-			return 3;
+			return 2;
 		} else if (reducerPid == -1) {
 			printf("Fork failed!\n");
-			return 2;
+			return 1;
 		}
 	}
 
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