parlib: Prevent running ctors twice Previously, we only were protecting vcore_lib_init() and uthread_lib_init(). However, there are other ctors out there, some of which have external effects (devalarm). Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

diff --git a/user/parlib/alarm.c b/user/parlib/alarm.c
index 00d7eea..54eaad4 100644
--- a/user/parlib/alarm.c
+++ b/user/parlib/alarm.c

@@ -153,6 +153,8 @@
 	struct event_queue *ev_q;
 	static struct fork_cb devalarm_fork_cb = {.func = devalarm_forked};
 
+	if (__in_fake_parlib())
+		return;
 	/* Sets up timer chain (only one chain per process) */
 	spin_pdr_init(&global_tchain.lock);
 	TAILQ_INIT(&global_tchain.waiters);

diff --git a/user/parlib/panic.c b/user/parlib/panic.c
index ecac76c..dc796f5 100644
--- a/user/parlib/panic.c
+++ b/user/parlib/panic.c

@@ -7,6 +7,8 @@
 
 static void __attribute__((constructor)) parlib_stdio_init(void)
 {
+	if (__in_fake_parlib())
+		return;
 	/* This isn't ideal, since it might affect some stdout streams where our
 	 * parent tried to do something else.  Note that isatty() always returns
 	 * TRUE, due to how we fake tcgetattr(), and that doesn't affect whatever

diff --git a/user/parlib/vcore_tick.c b/user/parlib/vcore_tick.c
index d19ab95..fcd9e1d 100644
--- a/user/parlib/vcore_tick.c
+++ b/user/parlib/vcore_tick.c

@@ -35,6 +35,8 @@
 
 static void __attribute__((constructor)) vcore_tick_lib_init(void)
 {
+	if (__in_fake_parlib())
+		return;
 	__vc_ticks = calloc(max_vcores(), sizeof(struct vcore_tick));
 	assert(__vc_ticks);
 }