/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <signal.h>
#include <pthread.h>
#include <stdlib.h>
#include <errno.h>

#include "libc_private.h"

/*
 * Weak symbols: All libc internal usage of these functions should
 * use the weak symbol versions (_pthread_XXX).  If libpthread is
 * linked, it will override these functions with (non-weak) routines.
 * The _pthread_XXX functions are provided solely for internal libc
 * usage to avoid unwanted cancellation points and to differentiate
 * between application locks and libc locks (threads holding the
 * latter can't be allowed to exit/terminate).
 */

/* Define a null pthread structure just to satisfy _pthread_self. */
struct pthread {
};

static struct pthread	main_thread;

static int		stub_main(void);
static void		stub_void(void);
static void		*stub_null(void);
static struct pthread	*stub_self(void);
static int		stub_zero(void);
static int		stub_fail(void);
static int		stub_true(void);
static void		stub_exit(void);
static int		stub_esrch(void);
static int		stub_getname_np(pthread_t, char *, size_t);

#define	PJT_DUAL_ENTRY(entry)	\
	(pthread_func_t)entry, (pthread_func_t)entry

pthread_func_entry_t __thr_jtable[PJT_MAX] = {
	[PJT_ATFORK] =			{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_DESTROY] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETDETACHSTATE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETGUARDSIZE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETINHERITSCHED] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETSCHEDPARAM] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETSCHEDPOLICY] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETSCOPE] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETSTACKADDR] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GETSTACKSIZE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_INIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETDETACHSTATE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETGUARDSIZE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETINHERITSCHED] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETSCHEDPARAM] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETSCHEDPOLICY] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETSCOPE] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETSTACKADDR] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_SETSTACKSIZE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CANCEL] =			{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CLEANUP_POP] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CLEANUP_PUSH] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_COND_BROADCAST] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_COND_DESTROY] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_COND_INIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_COND_SIGNAL] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_COND_TIMEDWAIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_COND_WAIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_DETACH] =			{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_EQUAL] =			{PJT_DUAL_ENTRY(stub_true)},
	[PJT_EXIT] =			{PJT_DUAL_ENTRY(stub_exit)},
	[PJT_GETSPECIFIC] =		{PJT_DUAL_ENTRY(stub_null)},
	[PJT_JOIN] =			{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_KEY_CREATE] =		{PJT_DUAL_ENTRY(stub_fail)},
	[PJT_KEY_DELETE] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_KILL] =			{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MAIN_NP] =			{PJT_DUAL_ENTRY(stub_main)},
	[PJT_MUTEXATTR_DESTROY] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEXATTR_INIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEXATTR_SETTYPE] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEX_DESTROY] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEX_INIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEX_LOCK] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEX_TRYLOCK] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEX_UNLOCK] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ONCE] =			{PJT_DUAL_ENTRY(stub_fail)},
	[PJT_RWLOCK_DESTROY] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_RWLOCK_INIT] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_RWLOCK_RDLOCK] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_RWLOCK_TRYRDLOCK] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_RWLOCK_TRYWRLOCK] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_RWLOCK_UNLOCK] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_RWLOCK_WRLOCK] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_SELF] =			{PJT_DUAL_ENTRY(stub_self)},
	[PJT_SETCANCELSTATE] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_SETCANCELTYPE] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_SETSPECIFIC] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_SIGMASK] =			{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_TESTCANCEL] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CLEANUP_POP_IMP] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CLEANUP_PUSH_IMP] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CANCEL_ENTER] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_CANCEL_LEAVE] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEX_CONSISTENT] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEXATTR_GETROBUST] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_MUTEXATTR_SETROBUST] =	{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_GETTHREADID_NP] =		{PJT_DUAL_ENTRY(stub_zero)},
	[PJT_ATTR_GET_NP] =		{PJT_DUAL_ENTRY(stub_esrch)},
	[PJT_GETNAME_NP] =		{PJT_DUAL_ENTRY(stub_getname_np)},
	[PJT_SUSPEND_ALL_NP] =		{PJT_DUAL_ENTRY(stub_void)},
	[PJT_RESUME_ALL_NP] =		{PJT_DUAL_ENTRY(stub_void)},
};

/*
 * Weak aliases for exported (pthread_*) and internal (_pthread_*) routines.
 */
#define	WEAK_REF(sym, alias)	__weak_reference(sym, alias)

#define	FUNC_TYPE(name)		__CONCAT(name, _func_t)
#define	FUNC_INT(name)		__CONCAT(name, _int)
#define	FUNC_EXP(name)		__CONCAT(name, _exp)

#define	STUB_FUNC(name, idx, ret)				\
	static ret FUNC_EXP(name)(void) __used;			\
	static ret FUNC_INT(name)(void) __used;			\
	WEAK_REF(FUNC_EXP(name), name);				\
	WEAK_REF(FUNC_INT(name), __CONCAT(_, name));		\
	typedef ret (*FUNC_TYPE(name))(void);			\
	static ret FUNC_EXP(name)(void)				\
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][0];	\
		return (func());				\
	}							\
	static ret FUNC_INT(name)(void)				\
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][1];	\
		return (func());				\
	}

#define	STUB_FUNC1(name, idx, ret, p0_type)			\
	static ret FUNC_EXP(name)(p0_type) __used;		\
	static ret FUNC_INT(name)(p0_type) __used;		\
	WEAK_REF(FUNC_EXP(name), name);				\
	WEAK_REF(FUNC_INT(name), __CONCAT(_, name));		\
	typedef ret (*FUNC_TYPE(name))(p0_type);		\
	static ret FUNC_EXP(name)(p0_type p0)			\
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][0];	\
		return (func(p0));				\
	}							\
	static ret FUNC_INT(name)(p0_type p0)			\
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][1];	\
		return (func(p0));				\
	}

#define	STUB_FUNC2(name, idx, ret, p0_type, p1_type)		\
	static ret FUNC_EXP(name)(p0_type, p1_type) __used;	\
	static ret FUNC_INT(name)(p0_type, p1_type) __used;	\
	WEAK_REF(FUNC_EXP(name), name);				\
	WEAK_REF(FUNC_INT(name), __CONCAT(_, name));		\
	typedef ret (*FUNC_TYPE(name))(p0_type, p1_type);	\
	static ret FUNC_EXP(name)(p0_type p0, p1_type p1)	\
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][0];	\
		return (func(p0, p1));				\
	}							\
	static ret FUNC_INT(name)(p0_type p0, p1_type p1)	\
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][1];	\
		return (func(p0, p1));				\
	}

#define	STUB_FUNC3(name, idx, ret, p0_type, p1_type, p2_type)	\
	static ret FUNC_EXP(name)(p0_type, p1_type, p2_type) __used; \
	static ret FUNC_INT(name)(p0_type, p1_type, p2_type) __used; \
	WEAK_REF(FUNC_EXP(name), name);				\
	WEAK_REF(FUNC_INT(name), __CONCAT(_, name));		\
	typedef ret (*FUNC_TYPE(name))(p0_type, p1_type, p2_type); \
	static ret FUNC_EXP(name)(p0_type p0, p1_type p1, p2_type p2) \
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][0];	\
		return (func(p0, p1, p2));			\
	}							\
	static ret FUNC_INT(name)(p0_type p0, p1_type p1, p2_type p2) \
	{							\
		FUNC_TYPE(name) func;				\
		func = (FUNC_TYPE(name))__thr_jtable[idx][1];	\
		return (func(p0, p1, p2));			\
	}

STUB_FUNC1(pthread_cond_broadcast, PJT_COND_BROADCAST, int, void *)
STUB_FUNC1(pthread_cond_destroy, PJT_COND_DESTROY, int, void *)
STUB_FUNC2(pthread_cond_init,	PJT_COND_INIT, int, void *, void *)
STUB_FUNC1(pthread_cond_signal,	PJT_COND_SIGNAL, int, void *)
STUB_FUNC2(pthread_cond_wait,	PJT_COND_WAIT, int, void *, void *)
STUB_FUNC1(pthread_getspecific,	PJT_GETSPECIFIC, void *, pthread_key_t)
STUB_FUNC2(pthread_key_create,	PJT_KEY_CREATE, int, void *, void *)
STUB_FUNC1(pthread_key_delete,	PJT_KEY_DELETE, int, pthread_key_t)
STUB_FUNC(pthread_main_np,	PJT_MAIN_NP, int)
STUB_FUNC1(pthread_mutex_destroy, PJT_MUTEX_DESTROY, int, void *)
STUB_FUNC2(pthread_mutex_init,	PJT_MUTEX_INIT, int, void *, void *)
STUB_FUNC1(pthread_mutex_lock,	PJT_MUTEX_LOCK, int, void *)
STUB_FUNC1(pthread_mutex_trylock, PJT_MUTEX_TRYLOCK, int, void *)
STUB_FUNC1(pthread_mutex_unlock, PJT_MUTEX_UNLOCK, int, void *)
STUB_FUNC1(pthread_mutex_consistent, PJT_MUTEX_CONSISTENT, int, void *)
STUB_FUNC1(pthread_mutexattr_destroy, PJT_MUTEXATTR_DESTROY, int, void *)
STUB_FUNC1(pthread_mutexattr_init, PJT_MUTEXATTR_INIT, int, void *)
STUB_FUNC2(pthread_mutexattr_settype, PJT_MUTEXATTR_SETTYPE, int, void *, int)
STUB_FUNC2(pthread_mutexattr_getrobust, PJT_MUTEXATTR_GETROBUST, int, void *,
    int *)
STUB_FUNC2(pthread_mutexattr_setrobust, PJT_MUTEXATTR_SETROBUST, int, void *,
    int)
STUB_FUNC2(pthread_once,	PJT_ONCE, int, void *, void *)
STUB_FUNC1(pthread_rwlock_destroy, PJT_RWLOCK_DESTROY, int, void *)
STUB_FUNC2(pthread_rwlock_init,	PJT_RWLOCK_INIT, int, void *, void *)
STUB_FUNC1(pthread_rwlock_rdlock, PJT_RWLOCK_RDLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_tryrdlock, PJT_RWLOCK_TRYRDLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_trywrlock, PJT_RWLOCK_TRYWRLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_unlock, PJT_RWLOCK_UNLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_wrlock, PJT_RWLOCK_WRLOCK, int, void *)
STUB_FUNC(pthread_self,		PJT_SELF, pthread_t)
STUB_FUNC(pthread_getthreadid_np, PJT_GETTHREADID_NP, int)
STUB_FUNC2(pthread_setspecific, PJT_SETSPECIFIC, int, pthread_key_t, void *)
STUB_FUNC3(pthread_sigmask, PJT_SIGMASK, int, int, void *, void *)
STUB_FUNC3(pthread_atfork, PJT_ATFORK, int, void *, void *, void*)
STUB_FUNC1(pthread_attr_destroy, PJT_ATTR_DESTROY, int, void *);
STUB_FUNC2(pthread_attr_getdetachstate, PJT_ATTR_GETDETACHSTATE, int, void *, void *)
STUB_FUNC2(pthread_attr_getguardsize, PJT_ATTR_GETGUARDSIZE, int, void *, void *)
STUB_FUNC2(pthread_attr_getstackaddr, PJT_ATTR_GETSTACKADDR, int, void *, void *)
STUB_FUNC2(pthread_attr_getstacksize, PJT_ATTR_GETSTACKSIZE, int, void *, void *)
STUB_FUNC2(pthread_attr_getinheritsched, PJT_ATTR_GETINHERITSCHED, int, void *, void *)
STUB_FUNC2(pthread_attr_getschedparam, PJT_ATTR_GETSCHEDPARAM, int, void *, void *)
STUB_FUNC2(pthread_attr_getschedpolicy, PJT_ATTR_GETSCHEDPOLICY, int, void *, void *)
STUB_FUNC2(pthread_attr_getscope, PJT_ATTR_GETSCOPE, int, void *, void *)
STUB_FUNC1(pthread_attr_init, PJT_ATTR_INIT, int, void *)
STUB_FUNC2(pthread_attr_setdetachstate, PJT_ATTR_SETDETACHSTATE, int, void *, int)
STUB_FUNC2(pthread_attr_setguardsize, PJT_ATTR_SETGUARDSIZE, int, void *, size_t)
STUB_FUNC2(pthread_attr_setstackaddr, PJT_ATTR_SETSTACKADDR, int, void *, void *)
STUB_FUNC2(pthread_attr_setstacksize, PJT_ATTR_SETSTACKSIZE, int, void *, size_t)
STUB_FUNC2(pthread_attr_setinheritsched, PJT_ATTR_SETINHERITSCHED, int, void *, int)
STUB_FUNC2(pthread_attr_setschedparam, PJT_ATTR_SETSCHEDPARAM, int, void *, void *)
STUB_FUNC2(pthread_attr_setschedpolicy, PJT_ATTR_SETSCHEDPOLICY, int, void *, int)
STUB_FUNC2(pthread_attr_setscope, PJT_ATTR_SETSCOPE, int, void *, int)
STUB_FUNC1(pthread_cancel, PJT_CANCEL, int, void *)
STUB_FUNC1(pthread_cleanup_pop, PJT_CLEANUP_POP, int, int)
STUB_FUNC2(pthread_cleanup_push, PJT_CLEANUP_PUSH, void, void *, void *)
STUB_FUNC3(pthread_cond_timedwait, PJT_COND_TIMEDWAIT, int, void *, void *, void *)
STUB_FUNC1(pthread_detach, PJT_DETACH, int, void *)
STUB_FUNC2(pthread_equal, PJT_EQUAL, int, void *, void *)
STUB_FUNC1(pthread_exit, PJT_EXIT, void, void *)
STUB_FUNC2(pthread_join, PJT_JOIN, int, void *, void *)
STUB_FUNC2(pthread_kill, PJT_KILL, int, void *, int)
STUB_FUNC2(pthread_setcancelstate, PJT_SETCANCELSTATE, int, int, void *)
STUB_FUNC2(pthread_setcanceltype, PJT_SETCANCELTYPE, int, int, void *)
STUB_FUNC(pthread_testcancel, PJT_TESTCANCEL, void)
STUB_FUNC1(__pthread_cleanup_pop_imp, PJT_CLEANUP_POP_IMP, void, int)
STUB_FUNC3(__pthread_cleanup_push_imp, PJT_CLEANUP_PUSH_IMP, void, void *,
    void *, void *)
STUB_FUNC1(_pthread_cancel_enter, PJT_CANCEL_ENTER, void, int)
STUB_FUNC1(_pthread_cancel_leave, PJT_CANCEL_LEAVE, void, int)
STUB_FUNC2(pthread_attr_get_np, PJT_ATTR_GET_NP, int, pthread_t, pthread_attr_t *)
STUB_FUNC3(pthread_getname_np, PJT_GETNAME_NP, int, pthread_t, char *, size_t)
STUB_FUNC(pthread_suspend_all_np, PJT_SUSPEND_ALL_NP, void);
STUB_FUNC(pthread_resume_all_np, PJT_RESUME_ALL_NP, void);

static int
stub_zero(void)
{
	return (0);
}

static void
stub_void(void)
{

}

static void *
stub_null(void)
{
	return (NULL);
}

static struct pthread *
stub_self(void)
{
	return (&main_thread);
}

static int
stub_fail(void)
{
	return (ENOSYS);
}

static int
stub_main(void)
{
	return (-1);
}

static int
stub_true(void)
{
	return (1);
}

static void
stub_exit(void)
{
	exit(0);
}

static int
stub_esrch(void)
{
	return (ESRCH);
}

static int
stub_getname_np(pthread_t thread, char *buf, size_t len)
{
	if (thread != &main_thread)
		return (ESRCH);
	if (len >= 1)
		buf[0] = '\0';
	return (0);
}