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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix && !darwin
#ifndef _GNU_SOURCE // pthread_getattr_np
#define _GNU_SOURCE
#endif
#include <pthread.h>
#include "libcgo.h"
void
x_cgo_getstackbound(uintptr bounds[2])
{
pthread_attr_t attr;
void *addr;
size_t size;
#if defined(__GLIBC__) || (defined(__sun) && !defined(__illumos__))
// pthread_getattr_np is a GNU extension supported in glibc.
// Solaris is not glibc but does support pthread_getattr_np
// (and the fallback doesn't work...). Illumos does not.
pthread_getattr_np(pthread_self(), &attr); // GNU extension
pthread_attr_getstack(&attr, &addr, &size); // low address
#elif defined(__illumos__)
pthread_attr_init(&attr);
pthread_attr_get_np(pthread_self(), &attr);
pthread_attr_getstack(&attr, &addr, &size); // low address
#else
pthread_attr_init(&attr);
pthread_attr_getstacksize(&attr, &size);
addr = __builtin_frame_address(0) + 4096 - size;
#endif
pthread_attr_destroy(&attr);
bounds[0] = (uintptr)addr;
bounds[1] = (uintptr)addr + size;
}