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-rw-r--r--P2/lib/utils.c42
1 files changed, 11 insertions, 31 deletions
diff --git a/P2/lib/utils.c b/P2/lib/utils.c
index 3ec7526..b8922d4 100644
--- a/P2/lib/utils.c
+++ b/P2/lib/utils.c
@@ -2,8 +2,7 @@
int openQueue() {
char cwd [50];
- if(getcwd(cwd, 50) == NULL)
- return NULL;
+ getcwd(cwd, 50);
return msgget(ftok(cwd, 4061), 0666 | IPC_CREAT);
}
int closeQueue(int id) {
@@ -22,8 +21,7 @@ char *getChunkData(int mapperID) {
struct msgBuffer message = makeMessage();
//Queue ID
int mid = openQueue();
- if (msgrcv(mid, &message, MSGSIZE, mapperID, 0) == -1)
- exit(-1);
+ msgrcv(mid, &message, MSGSIZE, mapperID, 0);
if (strncmp("END", message.msgText, 3) == 0)
return NULL;
char* value = malloc(1024); // chunkSize or MSGSIZE?
@@ -35,18 +33,11 @@ char *getChunkData(int mapperID) {
void sendChunkData(char *inputFile, int nMappers) {
struct msgBuffer message = makeMessage();
// open message queue
- int msgid;
- if (msgid == NULL)
- exit(-1);
- if (closeQueue(msgid) == -1)
- exit(-1);
+ int msgid = openQueue();
+ closeQueue(msgid);
msgid = openQueue();
- if (msgid == NULL)
- exit(-1);
int map = 0;
FILE* file = fopen(inputFile, "r");
- if (file == NULL)
- exit(-1);
// construct chunks of 1024 bytes
while(fgets(message.msgText, chunkSize + 1, file) != NULL) {
@@ -54,19 +45,15 @@ void sendChunkData(char *inputFile, int nMappers) {
while(validChar(message.msgText[i])) {
message.msgText[i--] = '\0';
}
- if (fseek(file, (i - 1023), SEEK_CUR) == -1) {
- break;
- }
+ fseek(file, (i - 1023), SEEK_CUR);
message.msgType = (map++ % nMappers) + 1;
- if (msgsnd(msgid, &message, MSGSIZE, 0) == -1)
- exit(-1);
+ msgsnd(msgid, &message, MSGSIZE, 0);
}
for (int i = 1; i <= nMappers; i++) {
struct msgBuffer END = {i, "END"};
- if (msgsnd(msgid, &END, MSGSIZE, 0) == -1)
- exit(-1);
- }
+ msgsnd(msgid, &END, MSGSIZE, 0);
+ }
fclose(file);
}
@@ -86,10 +73,7 @@ int getInterData(char *Qkey, int reducerID) {
struct msgBuffer message= makeMessage();
//DEBUG! make sure it work.
int id = openQueue();
- if (id == NULL)
- exit(-1);
- if (msgrcv(id, &message, MSGSIZE, reducerID, 0) == -1)
- exit(-1);
+ msgrcv(id, &message, MSGSIZE, reducerID, 0);
strcpy(Qkey, message.msgText);
return (strncmp("END", message.msgText, 3) != 0);
}
@@ -103,23 +87,19 @@ void shuffle(int nMappers, int nReducers) {
char newpath[100];
sprintf(newpath, "output/MapOut/Map_%d", i); // Removed /, add to current dir
DIR *dir = opendir(newpath);
- if (dir == NULL)
- break;
struct dirent* entry;
while ((entry = readdir(dir)) != NULL) {
if (!strcmp(".", entry->d_name) || !strcmp("..", entry->d_name))
continue;
sprintf(message.msgText, "%s/%s", newpath, entry -> d_name);
message.msgType = (hashFunction(entry -> d_name, nReducers)+1);
- if (msgsnd(id, &message, MSGSIZE, 0) == NULL)
- exit(-1);
+ msgsnd(id, &message, MSGSIZE, 0);
}
closedir(dir);
}
for (int i = 1; i <= nReducers; i++) {
struct msgBuffer END = {i, "END"};
- if (msgsnd(id, &END, MSGSIZE, 0))
- break;
+ msgsnd(id, &END, MSGSIZE, 0);
}
}