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Fixed an endless loop with cdrskin signal handling

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This commit is contained in:
Thomas Schmitt 2012-01-23 16:43:52 +00:00
parent 5a64c9ad2d
commit 78f40bd506
2 changed files with 74 additions and 36 deletions
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108
libburn/trunk/cdrskin/cdrskin.c
View File

@ -3500,8 +3500,14 @@ struct CdrskiN {
int lib_is_initialized;
pid_t control_pid; /* pid of the thread that calls libburn */
int drive_is_grabbed;
int drive_is_busy; /* Whether drive was told to do something cancel-worthy */
struct burn_drive *grabbed_drive;
/* Whether drive was told to do something cancel-worthy
0= no: directly call burn_abort
1= yes: A worker thread is busy (e.g. writing, formatting)
2= yes: A synchronous operation is busy (e.g. grabbing).
Do not wait but return -2.
*/
int drive_is_busy;
#ifndef Cdrskin_extra_leaN
/** Abort test facility */
@ -3892,6 +3898,34 @@ ex:;
}
int Cdrskin__is_aborting(int flag)
{
if(Cdrskin_abort_leveL)
return(-1);
return(burn_is_aborting(0));
}
int Cdrskin_abort(struct CdrskiN *skin, int flag)
{
int ret;
Cdrskin_abort_leveL= 1;
ret= burn_abort(skin->abort_max_wait, burn_abort_pacifier, "cdrskin: ");
if(ret<=0) {
fprintf(stderr,
"\ncdrskin: ABORT : Cannot cancel burn session and release drive.\n");
} else {
fprintf(stderr,
"cdrskin: ABORT : Drive is released and library is shut down now.\n");
}
fprintf(stderr,
"cdrskin: ABORT : Program done. Even if you do not see a shell prompt.\n");
fprintf(stderr,"\n");
exit(1);
}
/** Obtain access to a libburn drive for writing or information retrieval.
If libburn is not restricted to a single persistent address then the
unused drives are dropped. This might be done by shutting down and
@ -3913,7 +3947,7 @@ ex:;
*/
int Cdrskin_grab_drive(struct CdrskiN *skin, int flag)
{
int ret,i,profile_number;
int ret,i,profile_number, mem;
struct burn_drive *drive;
char profile_name[80];
enum burn_disc_status s;
@ -3933,16 +3967,31 @@ int Cdrskin_grab_drive(struct CdrskiN *skin, int flag)
}
if(skin->drive_is_grabbed) {
drive= skin->grabbed_drive;
mem= skin->drive_is_busy;
skin->drive_is_busy= 2;
ret= burn_drive_re_assess(skin->grabbed_drive, 0);
if(ret <=0 ) {
skin->drive_is_busy= mem;
if(Cdrskin__is_aborting(0)) {
fprintf(stderr,"cdrskin: ABORT : Drive re-assessment aborted\n");
Cdrskin_abort(skin, 0); /* Never comes back */
}
if(ret <= 0) {
if(!(flag&4))
fprintf(stderr,"cdrskin: FATAL : unable to re-assess drive '%s'\n",
skin->preskin->device_adr);
goto ex;
}
} else if(flag&1) {
mem= skin->drive_is_busy;
skin->drive_is_busy= 2;
ret= burn_drive_scan_and_grab(&(skin->drives),skin->preskin->device_adr,
!(flag&2));
skin->drive_is_busy= mem;
if(Cdrskin__is_aborting(0)) {
aborted:;
fprintf(stderr,"cdrskin: ABORT : Drive aquiration aborted\n");
Cdrskin_abort(skin, 0); /* Never comes back */
}
if(ret<=0) {
if(!(flag&4))
fprintf(stderr,"cdrskin: FATAL : unable to open drive '%s'\n",
@ -3974,7 +4023,12 @@ int Cdrskin_grab_drive(struct CdrskiN *skin, int flag)
}
}
mem= skin->drive_is_busy;
skin->drive_is_busy= 2;
ret= burn_drive_grab(drive,!(flag&2));
skin->drive_is_busy= mem;
if(Cdrskin__is_aborting(0))
goto aborted;
if(ret==0) {
if(!(flag&4))
fprintf(stderr,"cdrskin: FATAL : unable to open drive %d\n",
@ -4054,41 +4108,13 @@ int Cdrskin_release_drive(struct CdrskiN *skin, int flag)
}
int Cdrskin__is_aborting(int flag)
{
if(Cdrskin_abort_leveL)
return(-1);
return(burn_is_aborting(0));
}
int Cdrskin_abort(struct CdrskiN *skin, int flag)
{
int ret;
Cdrskin_abort_leveL= 1;
ret= burn_abort(skin->abort_max_wait, burn_abort_pacifier, "cdrskin: ");
if(ret<=0) {
fprintf(stderr,
"\ncdrskin: ABORT : Cannot cancel burn session and release drive.\n");
} else {
fprintf(stderr,
"cdrskin: ABORT : Drive is released and library is shut down now.\n");
}
fprintf(stderr,
"cdrskin: ABORT : Program done. Even if you do not see a shell prompt.\n");
fprintf(stderr,"\n");
exit(1);
}
/** Clean up resources in abort situations. To be called by Cleanup subsystem
but hardly ever by the application. The program must exit afterwards.
*/
int Cdrskin_abort_handler(struct CdrskiN *skin, int signum, int flag)
{
struct burn_progress p;
enum burn_drive_status drive_status= BURN_DRIVE_GRABBING;
enum burn_drive_status drive_status= BURN_DRIVE_SPAWNING;
/*
fprintf(stderr,
@ -4096,7 +4122,7 @@ int Cdrskin_abort_handler(struct CdrskiN *skin, int signum, int flag)
signum, flag, skin->drive_is_busy);
*/
if(!skin->drive_is_busy)
if(skin->drive_is_busy == 0)
Cdrskin_abort(skin, 0); /* Never comes back */
if(getpid()!=skin->control_pid) {
@ -4142,6 +4168,11 @@ int Cdrskin_abort_handler(struct CdrskiN *skin, int signum, int flag)
}
Cdrskin_abort_leveL= -1;
if(skin->drive_is_busy == 2 || drive_status == BURN_DRIVE_GRABBING) {
if(skin->grabbed_drive != NULL)
burn_drive_cancel(skin->grabbed_drive);
return(-2);
}
if (!(flag & 1)) {
if(skin->verbosity>=Cdrskin_verbose_debuG)
ClN(fprintf(stderr,"cdrskin_debug: ABORT : Calling burn_abort()\n"));
@ -8621,7 +8652,7 @@ ignore_unknown:;
int Cdrskin_create(struct CdrskiN **o, struct CdrpreskiN **preskin,
int *exit_value, int flag)
{
int ret, stdio_drive= 0;
int ret, stdio_drive= 0, mem;
struct CdrskiN *skin;
char reason[4096];
@ -8682,8 +8713,15 @@ int Cdrskin_create(struct CdrskiN **o, struct CdrpreskiN **preskin,
Cdrpreskin_queue_msgs(skin->preskin,1);
if(stdio_drive) {
mem= skin->drive_is_busy;
skin->drive_is_busy= 1;
ret= burn_drive_scan_and_grab(&(skin->drives),skin->preskin->device_adr,0);
if(ret<=0) {
skin->drive_is_busy= mem;
if(Cdrskin__is_aborting(0)) {
fprintf(stderr,"cdrskin: ABORT : Startup aborted\n");
Cdrskin_abort(skin, 0); /* Never comes back */
}
if(ret <= 0) {
fprintf(stderr,"cdrskin: FATAL : Failed to grab emulated stdio-drive\n");
{*exit_value= 2; goto ex;}
}

2
libburn/trunk/cdrskin/cdrskin_timestamp.h
View File

@ -1 +1 @@
#define Cdrskin_timestamP "2012.01.23.102720"
#define Cdrskin_timestamP "2012.01.23.164346"