sysopen sysopen ck_fun s@ F S S S?
sysseek sysseek ck_fun s@ F S S
sysread sysread ck_fun imst@ F R S S?
-syswrite syswrite ck_fun imst@ F S S S?
+syswrite syswrite ck_fun imst@ F S S? S?
send send ck_fun imst@ F S S S?
recv recv ck_fun imst@ F R S S