1 #define _GNU_SOURCE 2 #include "pthread_impl.h" 3 #include "libc.h" 4 #include <sys/mman.h> 5 pthread_getattr_np(pthread_t t,pthread_attr_t * a)6int pthread_getattr_np(pthread_t t, pthread_attr_t *a) 7 { 8 *a = (pthread_attr_t){0}; 9 a->_a_detach = t->detach_state>=DT_DETACHED; 10 a->_a_guardsize = t->guard_size; 11 if (t->stack) { 12 a->_a_stackaddr = (uintptr_t)t->stack; 13 a->_a_stacksize = t->stack_size; 14 } else { 15 char *p = (void *)libc.auxv; 16 size_t l = PAGE_SIZE; 17 p += -(uintptr_t)p & PAGE_SIZE-1; 18 a->_a_stackaddr = (uintptr_t)p; 19 while (mremap(p-l-PAGE_SIZE, PAGE_SIZE, 2*PAGE_SIZE, 0)==MAP_FAILED && errno==ENOMEM) 20 l += PAGE_SIZE; 21 a->_a_stacksize = l; 22 } 23 return 0; 24 } 25