Implemented new API function burn_set_signal_handling(), libburner uses it
This commit is contained in:
parent
b3bea43074
commit
3b16ef699f
@ -12,6 +12,8 @@ libburn_libburn_la_SOURCES = \
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libburn/async.c \
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libburn/async.h \
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libburn/back_hacks.h \
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libburn/cleanup.c \
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libburn/cleanup.h \
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libburn/crc.c \
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libburn/crc.h \
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libburn/debug.c \
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@ -119,7 +121,8 @@ test_iso_SOURCES = test/iso.c
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cdrskin_cdrskin_CPPFLAGS = -Ilibburn
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cdrskin_cdrskin_CFLAGS = -DCdrskin_libburn_0_2_3
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cdrskin_cdrskin_LDADD = $(libburn_libburn_la_OBJECTS) $(THREAD_LIBS)
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cdrskin_cdrskin_SOURCES = cdrskin/cdrskin.c cdrskin/cdrfifo.c cdrskin/cdrfifo.h cdrskin/cleanup.c cdrskin/cleanup.h cdrskin/cdrskin_timestamp.h
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cdrskin_cdrskin_SOURCES = cdrskin/cdrskin.c cdrskin/cdrfifo.c cdrskin/cdrfifo.h cdrskin/cdrskin_timestamp.h
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## cdrskin_cdrskin_SOURCES = cdrskin/cdrskin.c cdrskin/cdrfifo.c cdrskin/cdrfifo.h cdrskin/cleanup.c cdrskin/cleanup.h cdrskin/cdrskin_timestamp.h
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##
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## Open questions: how to compute $timestamp and express -DX="$timestamp"
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##
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@ -186,6 +186,7 @@ or
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#ifdef Cdrskin_new_api_tesT
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/* put macros under test caveat here */
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#define Cdrskin_libburn_has_cleanup_handleR 1
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#endif
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@ -273,7 +274,12 @@ or
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#include <libburn/libburn.h>
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#ifdef Cdrskin_libburn_has_cleanup_handleR
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#define Cleanup_set_handlers burn_set_signal_handling
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#define Cleanup_app_handler_T burn_abort_handler_t
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#else
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#include "cleanup.h"
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#endif
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/** The size of a string buffer for pathnames and similar texts */
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@ -2652,11 +2658,10 @@ int Cdrskin_abort_handler(struct CdrskiN *skin, int signum, int flag)
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if(getpid()!=skin->control_pid) {
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if(skin->verbosity>=Cdrskin_verbose_debuG)
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ClN(fprintf(stderr,
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"cdrskin_debug: ABORT : Thread rejected: pid=%d, signum=%d\n",
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getpid(),signum));
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return(2); /* do only process the control thread */
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"\ncdrskin_debug: ABORT : [%d] Thread rejected: pid=%d, signum=%d\n",
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skin->control_pid,getpid(),signum));
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return(-2); /* do only process the control thread */
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}
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if(skin->preskin->abort_handler==3)
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Cleanup_set_handlers(NULL,NULL,2); /* ignore all signals */
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else if(skin->preskin->abort_handler==4)
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@ -1 +1 @@
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#define Cdrskin_timestamP "2006.10.02.103418"
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#define Cdrskin_timestamP "2006.10.03.162719"
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@ -3,7 +3,7 @@
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A signal handler which cleans up an application and exits.
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Provided under GPL license within cdrskin and under BSD license elsewise.
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Provided under GPL license within GPL projects, BSD license elsewise.
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*/
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/*
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@ -65,7 +65,7 @@ static int Cleanup_handler_exit(int exit_value, int signum, int flag)
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if(cleanup_perform_app_handler_first)
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if(cleanup_app_handler!=NULL) {
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ret= (*cleanup_app_handler)(cleanup_app_handle,signum,0);
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if(ret==2)
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if(ret==2 || ret==-2)
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return(2);
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}
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if(cleanup_exiting) {
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@ -77,11 +77,14 @@ static int Cleanup_handler_exit(int exit_value, int signum, int flag)
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}
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cleanup_exiting= 1;
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if(cleanup_msg[0]!=0)
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fprintf(stderr,"%s\n",cleanup_msg);
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fprintf(stderr,"\n%s\n",cleanup_msg);
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alarm(0);
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if(!cleanup_perform_app_handler_first)
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if(cleanup_app_handler!=NULL)
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(*cleanup_app_handler)(cleanup_app_handle,signum,0);
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if(cleanup_app_handler!=NULL) {
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ret= (*cleanup_app_handler)(cleanup_app_handle,signum,0);
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if(ret==2 || ret==-2)
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return(2);
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}
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exit(exit_value);
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}
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@ -115,8 +118,12 @@ int Cleanup_set_handlers(void *handle, Cleanup_app_handler_T handler, int flag)
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cleanup_msg[0]= 0;
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cleanup_app_handle= handle;
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cleanup_app_handler= handler;
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/* <<< make cleanup_exiting thread safe to get rid of this */
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if(flag&4)
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cleanup_perform_app_handler_first= 1;
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if(flag&1)
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sig_handler= SIG_DFL;
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else if(flag&2)
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@ -3,7 +3,7 @@
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A signal handler which cleans up an application and exits.
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Provided under GPL license within cdrskin and under BSD license elsewise.
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Provided under GPL license within GPL projects, BSD license elsewise.
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*/
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#ifndef Cleanup_includeD
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@ -13,7 +13,7 @@
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/** Layout of an application provided cleanup function using an application
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provided handle as first argument and the signal number as second
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argument. The third argument is a flag bit field with no defined bits yet.
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If the handler returns 2 then it has delegated exit() to some other
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If the handler returns 2 or -2 then it has delegated exit() to some other
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instance and the Cleanup handler shall return rather than exit.
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*/
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typedef int (*Cleanup_app_handler_T)(void *, int, int);
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@ -7,6 +7,7 @@
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debug_opts=
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def_opts=
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libvers="-DCdrskin_libburn_0_2_3"
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cleanup_src_or_obj="cdrskin/cleanup.c"
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libdax_msgs_o="libburn/libdax_msgs.o"
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do_strip=0
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static_opts=
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@ -24,10 +25,12 @@ do
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then
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libvers="-DCdrskin_libburn_cvs_A60220_tS"
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libdax_msgs_o="libburn/message.o"
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cleanup_src_or_obj="cdrskin/cleanup.c"
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elif test "$i" = "-libburn_0_2_2"
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then
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libvers="-DCdrskin_libburn_0_2_2"
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libdax_msgs_o="libburn/message.o"
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cleanup_src_or_obj="cdrskin/cleanup.c"
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elif test "$i" = "-libburn_0_2_3"
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then
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libvers="-DCdrskin_libburn_0_2_3"
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@ -35,9 +38,11 @@ do
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elif test "$i" = "-newapi" -o "$i" = "-experimental"
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then
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def_opts="$def_opts -DCdrskin_new_api_tesT"
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cleanup_src_or_obj="libburn/cleanup.o"
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elif test "$i" = "-oldfashioned"
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then
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def_opts="$def_opts -DCdrskin_oldfashioned_api_usE"
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cleanup_src_or_obj="cdrskin/cleanup.c"
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elif test "$i" = "-do_not_compile_cdrskin"
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then
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compile_cdrskin=0
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@ -85,7 +90,7 @@ echo "Build timestamp : $timestamp"
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if test "$compile_cdrskin"
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then
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echo "compiling program cdrskin/cdrskin.c $static_opts $debug_opts $libvers $def_opts"
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echo "compiling program cdrskin/cdrskin.c $static_opts $debug_opts $libvers $def_opts $cleanup_src_or_obj"
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cc $warn_opts -I. $static_opts $debug_opts $libvers $def_opts \
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-DCdrskin_build_timestamP='"'"$timestamp"'"' \
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\
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@ -93,7 +98,8 @@ then
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\
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cdrskin/cdrskin.c \
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$fifo_source \
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cdrskin/cleanup.c \
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\
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$cleanup_src_or_obj \
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\
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libburn/async.o \
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libburn/debug.o \
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191
libburn/cleanup.c
Normal file
191
libburn/cleanup.c
Normal file
@ -0,0 +1,191 @@
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/*
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cleanup.c , Copyright 2006 Thomas Schmitt <scdbackup@gmx.net>
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A signal handler which cleans up an application and exits.
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Provided under GPL license within GPL projects, BSD license elsewise.
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*/
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/*
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cc -g -o cleanup -DCleanup_standalonE cleanup.c
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*/
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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typedef void (*sighandler_t)(int);
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#include "cleanup.h"
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/* Signals to be caught */
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static int signal_list[]= {
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SIGHUP, SIGINT, SIGQUIT, SIGILL, SIGABRT,
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SIGFPE, SIGSEGV, SIGPIPE, SIGALRM, SIGTERM,
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SIGUSR1, SIGUSR2, SIGXCPU, SIGTSTP, SIGTTIN,
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SIGTTOU,
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SIGBUS, SIGPOLL, SIGPROF, SIGSYS, SIGTRAP,
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SIGVTALRM, SIGXCPU, SIGXFSZ, -1
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};
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static char *signal_name_list[]= {
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"SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGABRT",
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"SIGFPE", "SIGSEGV", "SIGPIPE", "SIGALRM", "SIGTERM",
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"SIGUSR1", "SIGUSR2", "SIGXCPU", "SIGTSTP", "SIGTTIN",
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"SIGTTOU",
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"SIGBUS", "SIGPOLL", "SIGPROF", "SIGSYS", "SIGTRAP",
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"SIGVTALRM", "SIGXCPU", "SIGXFSZ", "@"
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};
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static int signal_list_count= 24;
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/* Signals not to be caught */
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static int non_signal_list[]= {
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SIGKILL, SIGCHLD, SIGSTOP, SIGURG, -1
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};
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static int non_signal_list_count= 4;
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/* run time dynamic part */
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static char cleanup_msg[4096]= {""};
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static int cleanup_exiting= 0;
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static void *cleanup_app_handle= NULL;
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static Cleanup_app_handler_T cleanup_app_handler= NULL;
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static int cleanup_perform_app_handler_first= 0;
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static int Cleanup_handler_exit(int exit_value, int signum, int flag)
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{
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int ret;
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if(cleanup_perform_app_handler_first)
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if(cleanup_app_handler!=NULL) {
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ret= (*cleanup_app_handler)(cleanup_app_handle,signum,0);
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if(ret==2 || ret==-2)
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return(2);
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}
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if(cleanup_exiting) {
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if(cleanup_msg[0]!=0)
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fprintf(stderr,"%s\n",cleanup_msg);
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fprintf(stderr,"cleanup: ABORT : repeat by pid=%d, signum=%d\n",
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getpid(),signum);
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return(0);
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}
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cleanup_exiting= 1;
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if(cleanup_msg[0]!=0)
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fprintf(stderr,"\n%s\n",cleanup_msg);
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alarm(0);
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if(!cleanup_perform_app_handler_first)
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if(cleanup_app_handler!=NULL) {
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ret= (*cleanup_app_handler)(cleanup_app_handle,signum,0);
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if(ret==2 || ret==-2)
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return(2);
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}
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exit(exit_value);
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}
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static void Cleanup_handler_generic(int signum)
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{
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int i;
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sprintf(cleanup_msg,"UNIX-SIGNAL caught: %d errno= %d",signum,errno);
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for(i= 0; i<signal_list_count; i++)
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if(signum==signal_list[i]) {
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sprintf(cleanup_msg,"UNIX-SIGNAL: %s errno= %d",
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signal_name_list[i],errno);
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break;
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}
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Cleanup_handler_exit(1,signum,0);
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}
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int Cleanup_set_handlers(void *handle, Cleanup_app_handler_T handler, int flag)
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/*
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bit0= set to default handlers
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bit1= set to ignore
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bit2= set cleanup_perform_app_handler_first
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bit3= set SIGABRT to handler (makes sense with bits 0 or 1)
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*/
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{
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int i,j,max_sig= -1,min_sig= 0x7fffffff;
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sighandler_t sig_handler;
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cleanup_msg[0]= 0;
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cleanup_app_handle= handle;
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cleanup_app_handler= handler;
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/* <<< make cleanup_exiting thread safe to get rid of this */
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if(flag&4)
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cleanup_perform_app_handler_first= 1;
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if(flag&1)
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sig_handler= SIG_DFL;
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else if(flag&2)
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sig_handler= SIG_IGN;
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else
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sig_handler= Cleanup_handler_generic;
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/* set all signal numbers between the lowest and highest in the list
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except those in the non-signal list */
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for(i= 0; i<signal_list_count; i++) {
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if(signal_list[i]>max_sig)
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max_sig= signal_list[i];
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if(signal_list[i]<min_sig)
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min_sig= signal_list[i];
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}
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for(i= min_sig; i<=max_sig; i++) {
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for(j= 0; j<non_signal_list_count; j++)
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if(i==non_signal_list[j])
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break;
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if(j>=non_signal_list_count) {
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if(i==SIGABRT && (flag&8))
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signal(i,Cleanup_handler_generic);
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else
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signal(i,sig_handler);
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}
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}
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return(1);
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}
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#ifdef Cleanup_standalonE
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struct Demo_apP {
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char *msg;
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};
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int Demo_app_handler(struct Demo_apP *demoapp, int signum, int flag)
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{
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printf("Handling exit of demo application on signal %d. msg=\"%s\"\n",
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signum,demoapp->msg);
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return(1);
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}
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main()
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{
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struct Demo_apP demoapp;
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demoapp.msg= "Good Bye";
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Cleanup_set_handlers(&demoapp,(Cleanup_app_handler_T) Demo_app_handler,0);
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if(1) { /* change to 0 in order to wait for external signals */
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char *cpt= NULL,c;
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printf("Intentionally provoking SIGSEGV ...\n");
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c= *cpt;
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} else {
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printf("killme: %d\n",getpid());
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sleep(3600);
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}
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Cleanup_set_handlers(NULL,NULL,1);
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exit(0);
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}
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#endif /* Cleanup_standalonE */
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34
libburn/cleanup.h
Normal file
34
libburn/cleanup.h
Normal file
@ -0,0 +1,34 @@
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/*
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cleanup.c , Copyright 2006 Thomas Schmitt <scdbackup@gmx.net>
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A signal handler which cleans up an application and exits.
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Provided under GPL license within GPL projects, BSD license elsewise.
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*/
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#ifndef Cleanup_includeD
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#define Cleanup_includeD 1
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/** Layout of an application provided cleanup function using an application
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provided handle as first argument and the signal number as second
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argument. The third argument is a flag bit field with no defined bits yet.
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If the handler returns 2 or -2 then it has delegated exit() to some other
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instance and the Cleanup handler shall return rather than exit.
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*/
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typedef int (*Cleanup_app_handler_T)(void *, int, int);
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/** Establish exiting signal handlers on (hopefully) all signals that are
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not ignored by default or non-catchable.
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@param handle Opaque object which knows how to cleanup application
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@param handler Function which uses handle to perform application cleanup
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@param flag Control Bitfield
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bit0= reset to default signal handling
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*/
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int Cleanup_set_handlers(void *handle, Cleanup_app_handler_T handler,
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int flag);
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#endif /* ! Cleanup_includeD */
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@ -38,6 +38,15 @@ int burn_sg_open_o_nonblock = 1;
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int burn_sg_open_abort_busy = 0;
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/* ts A61002 */
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#include "cleanup.h"
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/* Parameters for builtin abort handler */
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static char abort_message_prefix[81] = {"libburn : "};
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static pid_t abort_control_pid= 0;
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/* ts A60925 : ticket 74 */
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/** Create the messenger object for libburn. */
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int burn_msgs_initialize(void)
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@ -197,3 +206,40 @@ ex:
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return ret;
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}
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int burn_builtin_abort_handler(void *handle, int signum, int flag)
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{
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if(getpid() != abort_control_pid)
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return -2;
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Cleanup_set_handlers(NULL, NULL, 2);
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fprintf(stderr,"%sABORT : Trying to shut down drive and library\n",
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abort_message_prefix);
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fprintf(stderr,
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"%sABORT : Wait the normal burning time before any kill -9\n",
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abort_message_prefix);
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close(0); /* somehow stdin as input blocks abort until EOF */
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burn_abort(4440, burn_abort_pacifier, abort_message_prefix);
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fprintf(stderr,
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"\n%sABORT : Program done. Even if you do not see a shell prompt.\n\n",
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abort_message_prefix);
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return(1);
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}
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void burn_set_signal_handling(void *handle, burn_abort_handler_t handler,
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int mode)
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{
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if(handler == NULL && mode == 0) {
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handler = burn_builtin_abort_handler;
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/*
|
||||
fprintf(stderr, "libburn_experimental: activated burn_builtin_abort_handler() with handle '%s'\n",(handle==NULL ? "libburn : " : (char *) handle));
|
||||
*/
|
||||
|
||||
}
|
||||
strcpy(abort_message_prefix, "libburn : ");
|
||||
if(handle != NULL)
|
||||
strncpy(abort_message_prefix, (char *) handle,
|
||||
sizeof(abort_message_prefix)-1);
|
||||
abort_message_prefix[sizeof(abort_message_prefix)-1] = 0;
|
||||
abort_control_pid= getpid();
|
||||
Cleanup_set_handlers(handle, (Cleanup_app_handler_T) handler, mode|4);
|
||||
}
|
||||
|
||||
|
||||
@ -392,7 +392,14 @@ int burn_initialize(void);
|
||||
void burn_finish(void);
|
||||
|
||||
|
||||
/* ts A61002 */
|
||||
/** Abort any running drive operation and finally call burn_finish().
|
||||
You MUST calm down the busy drive if an aborting event occurs during a
|
||||
burn run. For that you may call this function either from your own signal
|
||||
handling code or indirectly by activating the builtin signal handling:
|
||||
burn_set_signal_handling("my_app_name : ", NULL, 0);
|
||||
Else you may eventually call burn_drive_cancel() on the active drive and
|
||||
wait for it to assume state BURN_DRIVE_IDLE.
|
||||
@param patience Maximum number of seconds to wait for drives to finish
|
||||
@param pacifier_func If not NULL: a function to produce appeasing messages.
|
||||
See burn_abort_pacifier() for an example.
|
||||
@ -406,6 +413,8 @@ int burn_abort(int patience,
|
||||
|
||||
/** A pacifier function suitable for burn_abort.
|
||||
@param handle If not NULL, a pointer to a text suitable for printf("%s")
|
||||
@param patience Maximum number of seconds to wait
|
||||
@param elapsed Elapsed number of seconds
|
||||
*/
|
||||
int burn_abort_pacifier(void *handle, int patience, int elapsed);
|
||||
|
||||
@ -1071,6 +1080,29 @@ int burn_msgs_obtain(char *minimum_severity,
|
||||
char severity[]);
|
||||
|
||||
|
||||
/* ts A61002 */
|
||||
/* The prototype of a handler function suitable for burn_set_abort_handling().
|
||||
Such a function has to return -2 if it does not want the process to
|
||||
exit with value 1.
|
||||
*/
|
||||
typedef int (*burn_abort_handler_t)(void *handle, int signum, int flag);
|
||||
|
||||
/** Control builtin signal handling. See also burn_abort().
|
||||
@param handle Opaque handle eventually pointing to an application
|
||||
provided memory object
|
||||
@param handler A function to be called on signals. It will get handle as
|
||||
argument. It should finally call burn_abort(). See there.
|
||||
@param mode : 0 call handler(handle, signum, 0) on nearly all signals
|
||||
1 enable system default reaction on all signals
|
||||
2 try to ignore nearly all signals
|
||||
10 like mode 2 but handle SIGABRT like with mode 0
|
||||
Arguments (text, NULL, 0) activate the builtin abort handler. It will
|
||||
eventually call burn_abort() and then perform exit(1). If text is not NULL
|
||||
then it is used as prefix for pacifier messages of burn_abort_pacifier().
|
||||
*/
|
||||
void burn_set_signal_handling(void *handle, burn_abort_handler_t handler,
|
||||
int mode);
|
||||
|
||||
#ifndef DOXYGEN
|
||||
|
||||
BURN_END_DECLS
|
||||
|
||||
@ -16,6 +16,8 @@
|
||||
|
||||
Before you can do anything, you have to initialize libburn by
|
||||
burn_initialize()
|
||||
and provide some signal and abort handling, e.g. by the builtin handler, by
|
||||
burn_set_signal_handling()
|
||||
as it is done in main() at the end of this file. Then you aquire a
|
||||
drive in an appropriate way conforming to the API. The two main
|
||||
approaches are shown here in application functions:
|
||||
@ -248,10 +250,8 @@ int libburner_aquire_by_driveno(int *driveno)
|
||||
|
||||
To our knowledge it is hardly possible to abort an ongoing blank operation
|
||||
because after start it is entirely handled by the drive.
|
||||
So expect a blank run to survive the end of the blanking process and be
|
||||
patient for the usual timespan of a normal blank run. Only after that
|
||||
time has surely elapsed, only then you should start any rescue attempts
|
||||
with the drive. If necessary at all.
|
||||
So expect signal handling to wait the normal blanking timespan until it
|
||||
can allow the process to end. External kill -9 will not help the drive.
|
||||
*/
|
||||
int libburner_blank_disc(struct burn_drive *drive, int blank_fast)
|
||||
{
|
||||
@ -322,25 +322,11 @@ int libburner_regrab(struct burn_drive *drive) {
|
||||
|
||||
|
||||
/** Brings the preformatted image (ISO 9660, afio, ext2, whatever) onto media.
|
||||
|
||||
To make sure your image is fully readable on any Linux machine, this
|
||||
function adds 300 kB of padding to the track.
|
||||
|
||||
Without a signal handler it is quite dangerous to abort the process
|
||||
while this function is active. See cdrskin/cdrskin.c and its usage
|
||||
of cdrskin/cleanup.[ch] for an example of application provided
|
||||
abort handling. It must cope with 2 of 3 threads reporting for
|
||||
being handled.
|
||||
|
||||
Without signal handler have ready a command line
|
||||
cdrecord dev=... -reset
|
||||
with a dev= previously inquired by cdrecord [dev=ATA] -scanbus
|
||||
in order to get your drive out of shock state after raw abort.
|
||||
Thanks to Joerg Schilling for helping out unquestioned. :)
|
||||
|
||||
In general, libburn is less prone to system problems than cdrecord,
|
||||
i believe. But cdrecord had long years of time to complete itself.
|
||||
We are still practicing. Help us with that. :))
|
||||
In case of external signals expect abort handling of an ongoing burn to
|
||||
last up to a minute. Wait the normal burning timespan before any kill -9.
|
||||
*/
|
||||
int libburner_payload(struct burn_drive *drive, const char *source_adr,
|
||||
off_t size)
|
||||
@ -590,6 +576,10 @@ int main(int argc, char **argv)
|
||||
exit(33);
|
||||
}
|
||||
|
||||
/* Activate the default signal handler which eventually will try to
|
||||
properly shutdown drive and library on aborting events. */
|
||||
burn_set_signal_handling("libburner : ", NULL, 0);
|
||||
|
||||
/** Note: driveno might change its value in this call */
|
||||
ret = libburner_aquire_drive(drive_adr, &driveno);
|
||||
if (ret<=0) {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user