exo 1 + pgl

bac2/os/chap3/Makefile

@@ -0,0 +1,20 @@
+.PHONY: clean, mrproper
+CC = gcc
+CFLAGS = -g -Wall
+
+all: ex1
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+ex1: ex1.o
+	$(CC) $(CFLAGS) -o $@ $+
+
+clean:
+	rm -f *.o core.*
+
+mrproper: clean
+	rm -f ex1
+
+run: ex1
+	./$<

bac2/os/chap3/ex1.c

@@ -0,0 +1,17 @@
+#include <unistd.h>
+#include <stdio.h>
+
+#define printv(x) printf("%s = %d\n", (#x), (x))
+
+int main(void)
+{
+	int f1, f2, f3;
+	f1 = fork();
+	printv(f1);
+	f2 = fork();
+	printv(f2);
+	f3 = fork();
+	printv(f3);
+
+	printf(" all => %d, %d, %d\n", f1, f2, f3);
+}