ISWRITE
} else if (ISWRITE(what)) {
if (ISREAD(what) || ISWRITE(what)) {
(ISWRITE(what) && prismember(&writefd, fdp1))) {
long nb = ISWRITE(what) ? pri->sys_args[2] : pri->Rval1;
ssize_t nbyte = ISWRITE(syscall)? pri->sys_args[2] :