Test program for forks.

tests/hellofork/Makefile

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+# This is the default target, which will be built when
+# you invoke make
+.PHONY: all
+all: hellofork
+
+hellofork: hellofork.c
+	g++ -g -o hellofork hellofork.c
+
+.PHONY: clean
+clean:
+	rm -f hellofork hellofork.o
+

tests/hellofork/hellofork.c

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+#include <sys/types.h>
+#include <unistd.h>
+#include <stdio.h>
+
+void func(int pid, int ret)
+{
+    printf("My PID is %d, fork() returned %d\n", pid, ret);
+
+    if (ret)
+        printf("We are in the parent process\n");
+    else
+        printf("We are in the child process\n");
+}
+
+int main()
+{
+    int r = fork();
+    func(getpid(), r);
+    return 0;
+}