add example program to fork a process

newlib/examples/Makefile

@@ -2,27 +2,28 @@ ARCH = x86
 NEWLIB = ../x86/i586-metalsvm-elf32
 MAKE = make
 CC = gcc
-CFLAGS = -m32 -O2 -nostdinc -Wall -fno-builtin -I$(NEWLIB)/include -I../../include -I../../arch/$(ARCH)/include #-fno-stack-protector 
+CFLAGS = -m32 -O2 -nostdinc -Wall -fno-builtin -I$(NEWLIB)/include -I../../include -I../../arch/$(ARCH)/include -fno-stack-protector 
 LDFLAGS = -m32 -nostdlib -L$(NEWLIB)/lib
 
 # other implicit rules
 %.o : %.c
 	$(CC) -c $(CFLAGS) -o $@ $< 
 
-default:
-	$(MAKE) hello
+default: all
 	
-all: 
-	$(MAKE) hello 
+all: hello test_fork
+	
+test_fork: test_fork.o
+	$(CC) -T link.ld -o $@ $(LDFLAGS) $<
 
 hello: hello.o
 	$(CC) -T link.ld -o $@ $(LDFLAGS) $< 
 
 clean:
-	$(RM) *.o *~ 
+	$(RM) hello test_fork *.o *~ 
 
 depend:
-	$(CC) -MM $(CFLAGS) hello.c > Makefile.dep
+	$(CC) -MM $(CFLAGS) *.c > Makefile.dep
 
 -include Makefile.dep
 # DO NOT DELETE

newlib/examples/test_fork.c

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2010 Stefan Lankes, Chair for Operating Systems,
+ *                               RWTH Aachen University
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of MetalSVM.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#undef errno
+extern int errno;
+
+int main(int argc, char** argv)
+{
+	pid_t pid = fork();
+
+	if (pid == 0) // child
+		printf("Hello from child process!\n");
+	else
+		printf("Hello from parent process! pid = %u\n", pid);
+
+	return errno;
+}