I have not reproduce your test scenario, looking at code please see following comments:
If you check the function definition of pqsecure_raw_read() it actually do set errno like bellow SOCK_ERRNO_SET(result_errno); where result_errno = SOCK_ERRNO Means anybody using those function pqsecure_raw_read/write, does not need to take care of portable ERRNO. Regards Umar Hayat The new status of this patch is: Waiting on Author