1#define _GNU_SOURCE
2#include "pthread_impl.h"
3#include "libc.h"
4#include <sys/mman.h>
5
6int pthread_getattr_np(pthread_t t, pthread_attr_t *a)
7{
8	*a = (pthread_attr_t){0};
9	a->_a_detach = !!t->detached;
10	if (t->stack) {
11		a->_a_stackaddr = (uintptr_t)t->stack;
12		a->_a_stacksize = t->stack_size;
13	} else {
14		char *p = (void *)libc.auxv;
15		size_t l = PAGE_SIZE;
16		p += -(uintptr_t)p & PAGE_SIZE-1;
17		a->_a_stackaddr = (uintptr_t)p;
18		while (mremap(p-l-PAGE_SIZE, PAGE_SIZE, 2*PAGE_SIZE, 0)==MAP_FAILED && errno==ENOMEM)
19			l += PAGE_SIZE;
20		a->_a_stacksize = l;
21	}
22	return 0;
23}
24