user-space programs can not get the correct errno

[stevezhougs]

Below return -1 to user-space program:
fopskit_return(fopskit_eperm); //int fopskit_eperm(void) { return -EPERM; }
In user-space run with strace,I saw this:
creat("/tmp/test/create.txt", 0644) = 4294967295
Normally，display should be：
creat("/tmp/test/create.txt", 0644) = -1 EACCES (Permission denied)

So,how should I do?