src/thread/pthread_getattr_np.c

   1 #define _GNU_SOURCE
   2 #include "pthread_impl.h"
   3 #include "libc.h"
   4 #include <sys/mman.h>
   5
   6 int 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 }