15-213 Introduction to Computer Systems

Section B

Jiin Joo Ong
jiinjoo@andrew.cmu.edu
Office Hours: Tuesdays 8:00pm - 9:00pm, WeH 3108 (Try the 5th floor clusters if you can't find me there.)

Example Makefile

CC = gcc
CFLAGS = -O2 
LDFLAGS = -lpthread -L/usr/X11R6/lib -lX11

OBJS = proxy.o csapp.o display.o

TEAM = NOBODY
VERSION = 1
INDIR = /afs/cs/academic/class/15213-f02/L7/handin

all: proxy

csapp.o: csapp.c
	$(CC) $(CFLAGS) -c csapp.c

proxy.o: proxy.c
	$(CC) $(CFLAGS) -c proxy.c

display.o: display.c
	$(CC) $(CFLAGS) -I/usr/X11R6/include  -c display.c

proxy: $(OBJS)
# This will make your proxy, run it (and the webserver)
	$(CC) $(LDFLAGS) $(OBJS) -o proxy
	./tiny/tiny 8000
	./proxy 8001

handin:
	cp proxy.c $(INDIR)/$(TEAM)-$(VERSION)-proxy.c
	cp csapp.c $(INDIR)/$(TEAM)-$(VERSION)-csapp.c
	cp csapp.h $(INDIR)/$(TEAM)-$(VERSION)-csapp.h

clean:
	rm -f *~ csapp.o proxy proxy.o display.o core

Code for TracePrintf

void TracePrintf(int level, const char *format, ...) {
    va_list argp;
    if (level <= tracelevel) {
	va_start(argp, format);
	vfprintf(stdout, format, argp);
	va_end(argp);
	fflush(stdout);
    }
}

Then you will need a global variable tracelevel. Initialize it in the beginning to the level of verbosity you want, and hand up your code setting it to 0.

You should set the tracelevel for tracing localized bugs to a higher number and the tracelevel for tracing gloabl bugs / bugs accross threads lower. Similarly, you should set the tracelevel for "following" the code higher and the tracelevel for errors lower. The closer to 0 the more important the print statement is.