Worked forth in order to make cdrskin fully newapi compliant
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@ -35,6 +35,51 @@ The implementation of an option would probably consist of
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existing methods
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See option blank= for an example.
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------------------------------------------------------------------------------
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About compliance with *strong urge* of API towards burn_drive_scan_and_grab()
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cdrskin was the initiator of the whitelist functionality within libburn.
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Now it has problems to obviously comply with the new API best practice
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presciptions literally. Therefore this explanation:
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On start it restricts the library to a single drive if it already knows the
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persistent address by option dev= . This is done with a combination of
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burn_drive_add_whitelist() and burn_drive_scan(). Not compliant to the
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literal strong urge but in fact exactly fulfilling the reason for that
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urge in the API: any scanned drive might be opened exclusively after
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burn_drive_scan(). It is kernel dependent wether this behavior is on, off
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or switchable. The sysdamin will want it on - but only for one drive.
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So with dev=... cdrskin complies to the spirit of the strong urge.
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Without dev=... it has to leave out the whitelist in order to enable bus
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scanning and implicit drive address 0. A tradition of 9 months shall not
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be broken. So burns without dev= will stay possible - and are now harmless.
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*
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Only if the new API compliance is enabled by macro Cdrskin_new_api_tesT .
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There is a flaw to be solved in libburn until new API compliance is in all
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aspects as good as the old handcrafted attempt to be sysadmin friendly.
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In many aspects it is already superior, note well.
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As soon as the flaw http://libburn.pykix.org/ticket/10 is removed,
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cdrskin will switch to its new way of API best practice compliance.
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*
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This is because Cdrskin_grab_drive() enforces a restart of the library
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with the desired drive's persistent address. This restart then really uses
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the strongly urged function burn_drive_scan_and_grab().
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Thus, cdrskin complies with the new spirit of API by closing down libburn
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as soon as the persistent drive address is known and the drive is to be
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used with a long running operation. To my knowlege all long running
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operations in cdrskin need a grabbed drive.
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This spaghetti approach seems necessary to keep small the impact of new API
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urge on cdrskin's stability. cdrskin suffers from having donated the body
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parts which have been transplanted to libburn in order to create
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burn_drive_scan_and_grab() . The desired sysadmin friendlyness was already
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achieved by most cdrskin runs. The remaining problem situations should now
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be defused by releasing any short time grabbed flocks of drives during the
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restart of libburn.
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------------------------------------------------------------------------------
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Compilation within cdrskin-* :
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@ -1794,6 +1839,7 @@ struct CdrskiN {
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};
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int Cdrskin_destroy(struct CdrskiN **o, int flag);
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int Cdrskin_grab_drive(struct CdrskiN *skin, int flag);
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int Cdrskin_release_drive(struct CdrskiN *skin, int flag);
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@ -2005,7 +2051,53 @@ int Cdrskin_adjust_speed(struct CdrskiN *skin, int flag)
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}
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/** Obtain access to a libburn drive for writing or information retrieval
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/** Shutdown library and restart again on single drive which gets grabbed.
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Does only work with a valid skin->driveno or with an already set
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skin->preskin->device_adr .
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@param flag Bitfield for control purposes:
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bit0= skin->driveno points to a valid drive. The library
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will get reopened with that drive listed as only one
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and already grabbed.
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@return 1 = success ,
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0 = failure, drive is released, library initialized
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-1 = failure, library is finished (and could not get initialized)
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*/
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int Cdrskin_reinit_lib_with_adr(struct CdrskiN *skin, int flag)
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{
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int ret;
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if(skin->drive_is_grabbed)
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Cdrskin_release_drive(skin,0);
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if(flag&1)
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burn_drive_get_adr(&(skin->drives[skin->driveno]),
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skin->preskin->device_adr);
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if(strlen(skin->preskin->device_adr)<=0) {
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fprintf(stderr,
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"cdrskin: FATAL : unable to determine persistent drive address\n");
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ret= 0; goto ex;
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}
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burn_finish();
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if(!burn_initialize()) {
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fflush(stdout);
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fprintf(stderr,"cdrskin : FATAL : Re-initialization of libburn failed\n");
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{ret= -1; goto ex;}
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}
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ret= Cdrskin_grab_drive(skin,1); /* uses burn_drive_scan_and_grab() */
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if(ret<=0)
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{ret=0; goto ex;}
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ret= 1;
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ex:
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return(ret);
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}
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/** Obtain access to a libburn drive for writing or information retrieval.
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Extended behavior with Cdrskin_new_api_tesT:
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If libburn is not restricted to a single persistent address then it
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gets shutdown and restarted with the wanted drive only. Thus, after
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this call, libburn is supposed to have open only the grabbed drive.
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All other drives should be free for other use.
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@param flag Bitfield for control purposes:
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bit0= bus is unscanned, device is known,
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use burn_drive_scan_and_grab()
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@ -2037,15 +2129,27 @@ int Cdrskin_grab_drive(struct CdrskiN *skin, int flag)
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#ifdef Cdrskin_new_api_tesT
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if(flag&1) {
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fprintf(stderr,
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"cdrskin: experimental: Cdrskin_grab_drive() on Cdrskin_new_api_tesT\n");
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"cdrskin: experimental: Cdrskin_grab_drive() from shutdown libburn\n");
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ret= burn_drive_scan_and_grab(&(skin->drives),skin->preskin->device_adr,1);
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if(ret<=0)
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if(ret<=0) {
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fprintf(stderr,"cdrskin: experimental: burn_drive_scan_and_grab ret=%d\n",
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ret);
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goto unable;
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}
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skin->driveno= 0;
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} else {
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fprintf(stderr,
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"cdrskin: experimental: Cdrskin_grab_drive() on active libburn\n");
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if(strlen(skin->preskin->device_adr)<=0) {
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fprintf(stderr,
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"cdrskin: experimental: Cdrskin_grab_drive() restarting libburn\n");
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ret= Cdrskin_reinit_lib_with_adr(skin,1);
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goto ex; /* this calls Cdrskin_grab() with persistent address or fails */
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}
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#else
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@ -4018,12 +4122,12 @@ int main(int argc, char **argv)
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if(skin->n_drives<=0) {
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fprintf(stderr,"cdrskin: NOTE : no usable drive detected.\n");
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if(getuid()!=0) {
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fprintf(stderr,
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"cdrskin: HINT : Busy drives are invisible. (Busy = open O_EXCL)\n");
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fprintf(stderr,
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"cdrskin: HINT : Run this program as superuser with option --devices\n");
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fprintf(stderr,
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"cdrskin: HINT : Allow rw-access to the dev='...' file of the burner.\n");
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fprintf(stderr,
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"cdrskin: HINT : Busy drives are invisible. (Busy = open O_EXCL)\n");
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}
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}
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