github.com/afumu/libc@v0.0.6/musl/src/errno/__errno_location.c (about)

     1  #include <errno.h>
     2  #include "pthread_impl.h"
     3  
     4  int *__errno_location(void)
     5  {
     6  	return &__pthread_self()->errno_val;
     7  }
     8  
     9  weak_alias(__errno_location, ___errno_location);