(sorry for the cross-posting with hugs-user -- I 've found this ml later) Hi, I'm learning how to use ffi with hugs (latest version, on Solaris 8, gcc 3.0.2). I can compile this simple example without errors ----Test.hs----------------------- module Test where import Foreign.C.String import Foreign.C.Types foreign import ccall "test.h incr" incr :: Int->IO Int foreign import ccall "test.h times" times :: CChar->Int->IO CString testTimes = do{j<-times (castCharToCChar 'a') 3;c <- peekCString j ;putStr c} testIncr = do{j<-incr 1;putStr $show j} ----Test.hs----------------------- ----test.c----------------------- #include <stdlib.h> #include "test.h" int incr(int i){ return i+1; } char* times(char c,int i){ printf("times running %d\n",i); char* ret; char* itr; ret=(char*)malloc(i*sizeof(char)+1); for (itr=ret;itr<ret+i;itr++){ *itr=c; } *itr=0; return ret; } ----test.c----------------------- ----test.h----------------------- int incr(int); char* times(char,int); ----test.h----------------------- the command I use is ffihugs -P{Hugs}/libraries/:{Hugs}/oldlib +G +L"test.c" Test.hs and generates Test.c and Test.so Hugs loads correctly the module but fails one of the tests: [vezzoli@web:883] ffi ->hugs -P{Hugs}/libraries/:{Hugs}/oldlib Test.hs __ __ __ __ ____ ___ _________________________________________ || || || || || || ||__ Hugs 98: Based on the Haskell 98 standard ||___|| ||__|| ||__|| __|| Copyright (c) 1994-2002 ||---|| ___|| World Wide Web: http://haskell.org/hugs || || Report bugs to: hugs-bugs@haskell.org || || Version: November 2002 _________________________________________ Haskell 98 mode: Restart with command line option -98 to enable extensions [loading prints removed] Test.hs Type :? for help Test> testIncr 2 Test> testTimes Unexpected signal [vezzoli@web:884] ffi -> The C code compiles and works correctly with a stand-alone test. Thank you in advance for any help. Marco -- Marco Vezzoli tel. +39 039 603 6852 STMicroelectronics fax. +39 039 603 5055 -- Marco Vezzoli tel. +39 039 603 6852 STMicroelectronics fax. +39 039 603 5055