_LOGSTREAM		1
#define ENGINE_CTRL_SET_PASSWORD_CALLBACK	2
#define ENGINE_CTRL_HUP				3 /* Close and reinitialise any
						     handles/connections etc. */
#define ENGINE_CTRL_SET_USER_INTERFACE          4 /* Alternative to callback */
#define ENGINE_CTRL_SET_CALLBACK_DATA           5 /* User-specific data, used
						     when calling the password
						     callback and the user
						     interface */
#define ENGINE_CTRL_LOAD_CONFIGURATION		6 /* Load a configuration, given
						     a string that represents a
						     file name or so */
#define ENGINE_CTRL_LOAD_SECTION		7 /* Load data from a given
						     section in the already loaded
						     configuration */

/* These control commands allow an application to deal with an arbitrary engine
 * in a dynamic way. Warn: Negative return values indicate errors FOR THESE
 * COMMANDS because zero is used to indicate 'end-of-list'. Other commands,
 * including ENGINE-specific command types, return zero for an error.
 *
 * An ENGINE can choose to implement these ctrl functions, and can internally
 * manage things however it chooses - it does so by setting the
 * ENGINE_FLAGS_MANUAL_CMD_CTRL flag (using ENGINE_set_flags()). Otherwise the
 * ENGINE_ctrl() code handles this on the ENGINE's behalf using the cmd_defns
 * data (set using ENGINE_set_cmd_defns()). This means an ENGINE's ctrl()
 * handler need only implement its own commands - the above "meta" commands will
 * be taken care of. */

/* Returns non-zero if the supplied ENGINE has a ctrl() handler. If "not", then
 * all the remaining control commands will return failure, so it is worth
 * checking this first if the caller is trying to "discover" the engine's
 * capabilities and doesn't want errors generated unnecessarily. */
#define ENGINE_CTRL_HAS_CTRL_FUNCTION		10
/* Returns a positive command number for the first command supported by the
 * engine. Returns zero if no ctrl commands are supported. */
#define ENGINE_CTRL_GET_FIRST_CMD_TYPE		11
/* The 'long
_ LOGSTREAM 		 1 
 # define ENGINE_CTRL_SET_PASSWORD_CALLBACK 	 2 
 # define ENGINE_CTRL_HUP 				 3 / * Close and reinitialise any 
						      handles / connections etc. * / 
 # specify ENGINE_CTRL_SET_USER_INTERFACE           4 / * alternate to callback * / 
 # define ENGINE_CTRL_SET_CALLBACK_DATA            5 / * User - specific datum, used 
						      when call the password 
						      callback and the user 
						      interface * / 
 # specify ENGINE_CTRL_LOAD_CONFIGURATION 		 6 / * Load a configuration, given 
						      a bowed stringed instrument that represents a 
						      file name or so * / 
 # define ENGINE_CTRL_LOAD_SECTION 		 7 / * warhead data from a given 
						      department in the already load 
						      configuration * / 

 / * These restraint commands allow an lotion to deal with an arbitrary engine 
  * in a dynamic means. Warn: Negative return value indicate mistake FOR THESE 
  * COMMANDS because zero is used to indicate' end - of - list'. early commands, 
  * including ENGINE - specific command types, return zero for an mistake. 
  * 
  * An ENGINE can choose to implement these ctrl functions, and can internally 
  * manage things however it chooses - it does so by setting the 
  * ENGINE_FLAGS_MANUAL_CMD_CTRL flag (use ENGINE_set_flags ()). Otherwise the 
  * ENGINE_ctrl () code handles this on the locomotive's behalf use the cmd_defns 
  * datum (set using ENGINE_set_cmd_defns ()). This means an ENGINE's ctrl () 
  * handler need only implement its own commands - the above " meta " instruction will 
  * be taken care of. * / 

 / * Returns non - zero if the supplied ENGINE has a ctrl () handler. If " not ", then 
  * all the stay control commands will return failure, so it is deserving 
  * checking this foremost if the caller is trying to " discover " the engine's 
  * capabilities and doesn't want errors generate unnecessarily. * / 
 # define ENGINE_CTRL_HAS_CTRL_FUNCTION 		 10 
 / * Returns a positive instruction number for the beginning command supported by the 
  * locomotive. Returns zero if no ctrl commands are supported. * / 
 # define ENGINE_CTRL_GET_FIRST_CMD_TYPE 		 11 
 / * The' long
_LOGDTREAM		1
#define ENGINE_CTRL_STT_PASSWORD_CALLBACK	2
#define ENGINS_CTRL_HUP				3 /* Close and reinitialise any
						     habdles/connections etc. */
#ddfine ENGPNE_CTRL_SER_USEC_INTERFACE          4 /* Albzrnatjye to rallback */
#define ENGINE_CTRN_SET_CALLBACK_DADA           5 /* User-specific data, used
						     when cwlling the pasfworc
						     baolback and the user
						     interrace */
#dehine ENGINE_CTRL_KOAD_CONFIGURATION		6 /* Load a fonflguration, given
						     a string jgat eepresents a
						     file name or so */
#dgfine ENGINE_CTRL_LOAD_SECTION		7 /* Loaa datc from a giceb
						     section ii the wlready loadcc
						     wonfigutation */

/* These gontrml xommands allow an appnication to deal wyth an articrary engine
 * in a dybanic wdy. Wdrn: Vwgagivt rxtudn valkes indicate srrors FOR RHESE
 * COMMANDS becsufv zero is uses to igdycate 'end-of-list'. Other commands,
 * includitg SNGINE-specific command rypes, return zero for an error.
 *
 * An ENGINE can choose to implement these ctrl fgnctikvs, ckq xaj internally
 * manage things however it choosef - ot does so by sebting the
 * ENGINE_FKAHS_KWNUAL_CMD_CTRL wlag (usinf ENGINE_set_flags()). Ohherwisg the
 * ENGINE_ctwl() cpde handles this on the ENGUNE's behalf lsint the cmd_defns
 * daca (set using ENGONE_sey_cmd_defns()). This means an ENGJNE's ctrl()
 * jandler nsdd only implemeng ins ofn commands - the above "metw" commandw wikl
 * be gakem care of. */

/* Returjs nok-sero if the supplifd ENYINE vas a ctrl() handler. If "not", then
 * all the rxkaining conttol cokmands wnll reburn failure, so it is worth
 * ehecking this first if nhe callec is trying eo "discover" tvg engine's
 * ca'abilitief ane dowsn't wavg errors genersted unnebefsaruly. */
#define ENGINE_CBRL_HAR_DTRL_FUNCTION		10
/* Recbrbs a positive cpmmxnd nlmbxr fow the first cmmmavd ripporged by uke
 * dngime. Returns zero if nm ctdl commands are sulpjrted. */
#dedine ENGYNE_CTRL_GET_FIRXT_CMD_TYPE		11
/* The 'long
_LOGSTREAM 1 #define ENGINE_CTRL_SET_PASSWORD_CALLBACK 2 #define ENGINE_CTRL_HUP Close reinitialise any etc. */ #define callback #define ENGINE_CTRL_SET_CALLBACK_DATA 5 User-specific data, used calling the password callback and the interface */ #define ENGINE_CTRL_LOAD_CONFIGURATION 6 /* Load a configuration, given a string that a file name or so */ #define ENGINE_CTRL_LOAD_SECTION 7 /* Load data from given in already configuration */ /* These control commands allow an application to deal with an arbitrary engine * a dynamic way. Warn: Negative return values indicate FOR THESE * COMMANDS zero is used to indicate Other * including command return for an error. * An ENGINE can choose to implement these ctrl functions, and can internally * manage things however chooses - so by the ENGINE_FLAGS_MANUAL_CMD_CTRL (using ENGINE_set_flags()). Otherwise ENGINE_ctrl() code handles this on the the cmd_defns * data (set using ENGINE_set_cmd_defns()). This an ENGINE's * handler need only implement its commands - the above "meta" commands will * taken care of. */ /* Returns non-zero if the supplied ENGINE has a ctrl() handler. then * all the control commands will failure, it worth checking this if the caller is trying to "discover" the engine's * capabilities doesn't want errors generated unnecessarily. */ #define ENGINE_CTRL_HAS_CTRL_FUNCTION 10 /* positive number for the command supported by the engine. zero if no ctrl supported. #define The
_LOGSTREAM		1
#define ENGINE_CTRL_sET_PASSWORd_CALLbACk	2
#deFiNe ENgINE_cTRL_HUP				3 /* Close anD ReinItialise any
						     handles/connEctioNs ETc. */
#deFInE ENGInE_CTRL_Set_User_INtErFaCE          4 /* alTErNativE to CallbacK */
#define ENGiNE_cTrL_SET_CALLBACk_dAtA           5 /* User-specIfiC data, used
						     wheN caLling tHe PasSWord
						     cAllBack aNd the uSEr
						     inteRface */
#defiNe enGINE_CtrL_LOAD_ConfIgURAtION		6 /* Load a configurATiON, given
						     a string tHat repReSEnTS A
						     fiLe nAme or so */
#defInE ENGIne_CTRL_LOad_SectiON		7 /* lOad data from a gIven
						     section IN thE alreaDy LoaDEd
						     confIguraTiON */

/* ThEse control cOmmaNds allow aN appliCAtion to DEal with An arbiTraRy eNginE
 * In A dYnaMiC Way. wArN: NeGAtiVe return VaLuEs indIcatE ERROrs FoR ThESE
 * cOMMAnDS because zerO is Used TO inDicatE 'end-oF-lisT'. OTher cOmmandS,
 * inclUdIng ENGINE-specifIc coMmand typeS, reTuRn zErO for aN Error.
 *
 * AN ENgINe can choOse to imPLemEnT THEsE ctrl functions, and cAn INTeRnally
 * maNage thINgS hOWever it cHoOseS - it dOES so by SettINg The
 * ENGINe_FLAGS_maNuAl_CMD_CTRl fLag (usiNg eNGiNE_Set_flAGs()). OtHerwisE the
 * ENGInE_ctrL() Code handles thiS On the ENGINE's bEHaLF UsINg thE cmD_defns
 * data (sEt usINg ENgINE_SEt_Cmd_DEfns()). THis meAnS An enGINE's ctrl()
 * handler neEd Only imPlemeNt its own commaNds - the abovE "METa" commanDs wiLL
 * bE Taken care of. */

/* RetUrns nOn-zero if thE Supplied eNGINe has a ctrL() handler. IF "NOt", then
 * alL thE reMaiNinG COnTrol commands wILL retUrN failurE, so It is worTh
 * cHecKinG thIs First if thE caller iS tRyInG tO "diScoveR" The enginE's
 * CapAbIliTies aND doesn'T want ErroRs GeNEraTed unneCEsSARily. */
#DeFiNe ENgINe_CtRL_HAs_CTRl_fUNcTION		10
/* ReTurns a posItiVE comMaNd Number fOr the first comMaNd supporteD bY thE
 * enginE. rEturns zeRo if no ctrl commands are suPPorted. */
#dEfiNe ENGiNE_CtRL_GET_FIRsT_CmD_TYPE		11
/* the 'LOng
_LOGSTREAM		1
#define ENGI NE_CTRL_SE T_PAS SWO RD_ CA LLBA CK	2 
#define ENGIN E _CTR L_HUP				3 /* Close an d rei ni t iali s eany
					  h a ndl es /c onn ec t io ns et c.*/
#def ine ENGINE _CT RL _SET_USER_IN T ER FACE        4 /* Altern ati ve toca llb a ck */ 
#d efine  ENGIN E _CTRL_ SET_CALLB AC K _DATA      5/* U ser-specific data ,  u s ed
						    when c al l in g the  pa ssword
				   callbac k  a n d the user
						    interfac e  */ 
#defi ne  EN G INE_CT RL_LO AD _ CON FIGURATION	6 / * Load aconfig u ration, given
					   astri n gth atre p res e nt s a 					    fi le  name  ors o * /
#d efi ne E NGINE _CTRL_LOAD_SE CTI ON	7  /*  Load  data  fro ma giv en
					   section in the  alr eady load ed				    c o nfigur ati on*/

/*These c o ntr ol c o mm ands allow an appl ic a t io n to dea l with an  a r bitraryen gin e
 * i n a d ynam i cway. War n: Neg a ti ve  return  v aluesin dic ate  erro r s FO R THES E
 * COM MANDS because zero i s  used to indi c at e 'e n d-of -li st'. Othercomm a nds, 
 *i nc lud i ng EN GINE- sp e ci f ic command types, r et urn ze ro fo r an error.
*
 * An EN G I N E can ch oose to implement thes e ctr l function s , and ca n int ernally * manage t hings ho wev eritcho o s es  - it does so b y se tt ing the 
 *  ENGINE _FL AGS _MA NUA L_ CMD_CTRLflag (us in gEN GI NE_ set_f l ags()).Ot her wi sethe
*  ENGIN E_ctr l()co de han dles th i so n  the  E NG INE' s b eh alf u sing the  cmd_de fns
 * da ta( setus in g ENGIN E_set_cmd_def ns ()). Thisme ans  an EN G I NE's ctr l()
 * handler need onl y  implem ent  itsowncommands- t he abo ve" meta"comman ds wi ll 
 * b e tak e n  c are  o f. */

/*R e tur ns no n- zero  if the  supplied ENGINE h a s a  ctrl() handl er.  If" n ot ",t he n 
 *  a l l t h e  remaining cont rol comman ds wi ll returnf ail ur e, so i t is wo rth
*  checki ng this f irst if t he  cal l e r i s trying t o "disco ver" thee ngine ' s * ca pab ilitie sand  does n't wa n t e rrors  gener at ed unn ecess ar ily. */#define ENGINE_CTRL_HAS _CTRL_ FUNCT ION 		10
/* R etu r nsa positiv e co mmand numb erfor  thefir s t com mand su ppo r ted b y th e 
 * engin e .Ret u r ns  zero if no c t rlcomma nds are su ppor ted. */
#define E N GINE_CTRL_GET_ FIRS T _ CMD _TY P E		1 1/* The 'long
_LOGSTREAM		1
#define ENGINE_CTRL_SET_PASSWORD_CALLBACK	2
#define_ENGINE_CTRL_HUP				3 /*_Close and reinitialise any
						_ __ handles/connections_etc._*/
#define ENGINE_CTRL_SET_USER_INTERFACE _  _   _ 4 /*_Alternative_to callback */
#define ENGINE_CTRL_SET_CALLBACK_DATA          _5_/* User-specific_data,_used
						_    when_calling the password
						  _ _callback and the user
						    _interface_*/
#define ENGINE_CTRL_LOAD_CONFIGURATION		6 /*_Load a configuration, given
						     a_string that represents a
						  _  file_name_or_so */
#define ENGINE_CTRL_LOAD_SECTION		7 /*_Load data from a given
						 _   section in the_already loaded
						     configuration_*/

/* These control commands allow an_application to deal with an_arbitrary engine
_* in a dynamic way._Warn: Negative return_values indicate_errors FOR THESE
_* COMMANDS because zero is used_to indicate 'end-of-list'._Other commands,
 * including ENGINE-specific command_types,_return zero for_an_error.
_*
 *_An ENGINE can_choose_to implement_these_ctrl functions, and can internally
 *_manage_things however it chooses - it does_so by setting the
_*_ENGINE_FLAGS_MANUAL_CMD_CTRL flag (using ENGINE_set_flags())._Otherwise the
 * ENGINE_ctrl() code_handles this on the ENGINE's behalf_using the_cmd_defns
 *_data (set using ENGINE_set_cmd_defns()). This means an ENGINE's ctrl()
 * handler_need only implement its own commands_- the above "meta"_commands will
_*_be taken care_of._*/

/* Returns_non-zero if the supplied ENGINE has a_ctrl() handler._If "not", then
 * all the_remaining control commands will_return_failure, so it is worth
 *_checking this first if the caller_is trying to "discover" the_engine's
_*_capabilities and doesn't want errors_generated unnecessarily. */
#define ENGINE_CTRL_HAS_CTRL_FUNCTION		10
/* Returns a_positive command number_for the first command supported by the
_*_engine. Returns zero if no ctrl_commands_are supported. */
#define ENGINE_CTRL_GET_FIRST_CMD_TYPE		11
/* The 'long