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