src/thread/pthread_getattr_np.c

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