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Do not build contrib and examples by default but require #4

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Do not build contrib and examples by default but require #4

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martinpaljak
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Those are probably not needed for most users and pollute the compilation with many warnings.

Require --enable-extras for those files.

@LudovicRousseau
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Good idea.
Your implementation does not work for me. In the generated Makefile.in the definition of EXTRA_SUBDIRS is made after it is used in SUBDIRS. So the extras are never build.
Does it work for you?
Is it a bug in autotools?

@martinpaljak
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Possible bug in the patch, I only checked that I extras would not be built by default. And I have no idea how the internals of autotools is working or supposed to work. I followed this: https://www.gnu.org/software/automake/manual/html_node/Subdirectories-with-AM_005fCONDITIONAL.html#Subdirectories-with-AM_005fCONDITIONAL

@LudovicRousseau
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I could not get a working patch.
Also "make dist" does not work as described in the documentation you mention. Something is missing/broken.

LudovicRousseau added a commit that referenced this pull request Nov 13, 2015
@LudovicRousseau
CreateChannelByNameOrChannel(): call FreeChannel() in case of error
522ebb2 
If the creation of a channel fails then call FreeChannel() instead of
IFDHCloseChannel().
The ressources are unalocated but with no access at the lower layer.

Since the creation failed the channel is not correctly created and
only part of the reader stucture is initialised.

The problem was discovered with the folowing problem:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff6fe2700 (LWP 6120)]
0x00007ffff5dca8f2 in CmdPowerOff (reader_index=0) at commands.c:1076
1076		cmd[6] = (*ccid_descriptor->pbSeq)++;
(gdb) print ccid_descriptor
$1 = (_ccid_descriptor *) 0x7ffff5fe0468 <usbDevice+40>
(gdb) print ccid_descriptor->pbSeq
$2 = (unsigned char *) 0x0

The pbSeq pointer is NULL and can't be dereferenced.

(gdb) bt
 #0  0x00007ffff5dca8f2 in CmdPowerOff (reader_index=0) at commands.c:1076
 #1  0x00007ffff5dce556 in IFDHCloseChannel (Lun=0) at ifdhandler.c:269
 #2  0x00007ffff5dce773 in CreateChannelByNameOrChannel (Lun=0,
     lpcDevice=0x269 <error: Cannot access memory at address 0x269>, Channel=0)
     at ifdhandler.c:194
 #3  0x000000000040673a in IFDOpenIFD (rContext=rContext@entry=0x61e010)
     at ifdwrapper.c:136
 #4  0x0000000000408151 in RFInitializeReader (rContext=0x61e010)
     at readerfactory.c:1036
 #5  0x0000000000408a93 in RFAddReader (readerNameLong=<optimized out>,
     port=2097152, library=<optimized out>,
     device=0x7ffff6fe1d30 "usb:08e6/3437:libusb-1.0:1:2:0")
     at readerfactory.c:329
 #6  0x000000000040d9d4 in HPAddHotPluggable (dev=0x0,
     bus_device=0x61d660 <readerTracker+32> "", interface=0,
     driver=<optimized out>, driver=<optimized out>, desc=...)
     at hotplug_libusb.c:608
 #7  0x000000000040dd2a in HPRescanUsbBus () at hotplug_libusb.c:373
 #8  0x000000000040dfa1 in HPEstablishUSBNotifications (pipefd=0x7fffffffe440)
     at hotplug_libusb.c:429
 #9  0x00007ffff75a30a4 in start_thread (arg=0x7ffff6fe2700)
     at pthread_create.c:309
 #10 0x00007ffff72d804d in clone ()
     at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
@draganafcb draganafcb mentioned this pull request Oct 5, 2018
Closed
LudovicRousseau added a commit that referenced this pull request Oct 23, 2023
@LudovicRousseau
Fix thread safe issue
72f2f23 
Declare LogLevel as _Atomic as it can be accessed from 2 different
threads.

==================
WARNING: ThreadSanitizer: data race (pid=35789)
  Write of size 4 at 0x7f123aafe310 by thread T3 (mutexes: write M0):
    #0 IFDHICCPresence CCID/src/ifdhandler.c:1986:12 (libccid.so+0xaa94) (BuildId: 34d145182e49b1532fafda06218243582b2f9366)
    #1 IFDStatusICC PCSC/src/ifdwrapper.c:349:7 (pcscd+0xd7725) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 EHStatusHandlerThread PCSC/src/eventhandler.c:332:8 (pcscd+0xd6b26) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Previous read of size 4 at 0x7f123aafe310 by thread T10:
    #0 IFDHSetCapabilities CCID/src/ifdhandler.c:696:2 (libccid.so+0xb032) (BuildId: 34d145182e49b1532fafda06218243582b2f9366)
    #1 IFDSetCapabilities PCSC/src/ifdwrapper.c:221:7 (pcscd+0xe6bc7) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 SCardSetAttrib PCSC/src/winscard.c:1470:7 (pcscd+0xe6bc7)
    #3 ContextThread PCSC/src/winscard_svc.c:792:16 (pcscd+0xe6bc7)
    #4 __tsan_thread_start_func <null> (pcscd+0x53d66) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #5 __tsan_thread_start_func <null> (pcscd+0x53d66) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  As if synchronized via sleep:
    #0 nanosleep <null> (pcscd+0x515ed) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 SYS_USleep PCSC/src/sys_unix.c:87:9 (pcscd+0xd709a) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 EHStatusHandlerThread PCSC/src/eventhandler.c (pcscd+0xd709a)
    #3 __tsan_thread_start_func <null> (pcscd+0x53d66) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Location is global 'LogLevel' of size 4 at 0x7f123aafe310 (libccid.so+0x22310)

  Mutex M0 (0x7b0c00000ed0) created at:
    #0 pthread_mutex_init <null> (pcscd+0x555cf) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 RFAddReader PCSC/src/readerfactory.c:355:9 (pcscd+0xdb5aa) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe33c9) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #3 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe29dd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #4 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe29dd)
    #5 main PCSC/src/pcscdaemon.c:766:7 (pcscd+0xd87e7) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Thread T3 (tid=35793, running) created by main thread at:
    #0 pthread_create <null> (pcscd+0x53dfd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 ThreadCreate PCSC/src/utils.c:184:8 (pcscd+0xe3c6b) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 EHSpawnEventHandler PCSC/src/eventhandler.c:233:7 (pcscd+0xd6910) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #3 RFAddReader PCSC/src/readerfactory.c:397:8 (pcscd+0xdb7ad) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #4 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe33c9) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #5 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe29dd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #6 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe29dd)
    #7 main PCSC/src/pcscdaemon.c:766:7 (pcscd+0xd87e7) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

  Thread T10 (tid=40070, running) created by main thread at:
    #0 pthread_create <null> (pcscd+0x53dfd) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #1 ThreadCreate PCSC/src/utils.c:184:8 (pcscd+0xe3c6b) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #2 CreateContextThread PCSC/src/winscard_svc.c:239:7 (pcscd+0xd931e) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #3 SVCServiceRunLoop PCSC/src/pcscdaemon.c:131:9 (pcscd+0xd931e)
    #4 main PCSC/src/pcscdaemon.c:799:2 (pcscd+0xd88e0) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)
    #5 main PCSC/src/pcscdaemon.c:799:2 (pcscd+0xd88e0) (BuildId: 4d1e07aaf5145539b5a42a2ed57bb9b51830ddfe)

SUMMARY: ThreadSanitizer: data race CCID/src/ifdhandler.c:1986:12 in IFDHICCPresence
==================
LudovicRousseau added a commit that referenced this pull request Oct 23, 2023
@LudovicRousseau
Fix thread safe issue
765b338 
Declare ReaderIndex[] as _Atomic as it can be accessed from 2 different
threads.

==================
WARNING: ThreadSanitizer: data race (pid=4017)
  Write of size 4 at 0x7fd1b32be970 by main thread (mutexes: write M0, write M1):
    #0 ReleaseReaderIndex CCID/src/utils.c:81:21 (libccid.so+0xa672) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #1 FreeChannel CCID/src/ifdhandler.c:92:2 (libccid.so+0xa672)
    #2 IFDHCloseChannel CCID/src/ifdhandler.c:302:2 (libccid.so+0xa672)
    #3 IFDCloseIFD PCSC/src/ifdwrapper.c:190:7 (pcscd+0xd9e30) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 RFUnInitializeReader PCSC/src/readerfactory.c:1153:9 (pcscd+0xd9e30)
    #5 removeReader PCSC/src/readerfactory.c:645:2 (pcscd+0xd9e30)
    #6 _UnrefReader PCSC/src/readerfactory.c:120:3 (pcscd+0xd9e30)
    #7 IFDCloseIFD PCSC/src/ifdwrapper.c:190:7 (pcscd+0xd9e30) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #8 RFUnInitializeReader PCSC/src/readerfactory.c:1153:9 (pcscd+0xd9e30)
    #9 removeReader PCSC/src/readerfactory.c:645:2 (pcscd+0xd9e30)
    #10 _UnrefReader PCSC/src/readerfactory.c:120:3 (pcscd+0xd9e30)
    #11 RFRemoveReader PCSC/src/readerfactory.c:624:5 (pcscd+0xdd282) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #12 RFRemoveReader PCSC/src/readerfactory.c:624:5 (pcscd+0xdd282) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #13 RFRemoveReader PCSC/src/readerfactory.c:624:5 (pcscd+0xdd282) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #14 RFCleanupReaders PCSC/src/readerfactory.c:1396:9 (pcscd+0xddb9e) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #15 SVCServiceRunLoop PCSC/src/pcscdaemon.c:123:4 (pcscd+0xd9574) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #16 main PCSC/src/pcscdaemon.c:801:2 (pcscd+0xd8810) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Previous read of size 4 at 0x7fd1b32be970 by thread T7:
    #0 LunToReaderIndex CCID/src/utils.c:72:14 (libccid.so+0xf8aa) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #1 IFDHPolling CCID/src/ifdhandler.c:313:28 (libccid.so+0xb1bf) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #2 EHStatusHandlerThread PCSC/src/eventhandler.c:467:10 (pcscd+0xd6f9b) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  As if synchronized via sleep:
    #0 nanosleep <null> (pcscd+0x515ed) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 SYS_Sleep PCSC/src/sys_unix.c:69:9 (pcscd+0xdfbf9) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #2 SVCServiceRunLoop PCSC/src/pcscdaemon.c:117:10 (pcscd+0xd956a) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #3 main PCSC/src/pcscdaemon.c:801:2 (pcscd+0xd8810) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Location is global 'ReaderIndex' of size 64 at 0x7fd1b32be970 (libccid.so+0x22970)

  Mutex M0 (0x7b0c00000ed0) created at:
    #0 pthread_mutex_init <null> (pcscd+0x555cf) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 RFAddReader PCSC/src/readerfactory.c:355:9 (pcscd+0xdb4b7) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #2 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe3409) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #3 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe2a1d) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe2a1d)
    #5 main PCSC/src/pcscdaemon.c:768:7 (pcscd+0xd8717) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Mutex M1 (0x7fd1b32be948) created at:
    #0 pthread_mutex_lock <null> (pcscd+0x71ada) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 CreateChannelByNameOrChannel CCID/src/ifdhandler.c:119:8 (libccid.so+0x82ae) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #2 IFDHCreateChannelByName CCID/src/ifdhandler.c:233:9 (libccid.so+0x7e55) (BuildId: 69b3a74d7af87f05c5edb71935a43b024a0fe968)
    #3 IFDOpenIFD PCSC/src/ifdwrapper.c:136:9 (pcscd+0xdd0cb) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 RFInitializeReader PCSC/src/readerfactory.c:1121:8 (pcscd+0xdd0cb)
    #5 RFAddReader PCSC/src/readerfactory.c:366:7 (pcscd+0xdb52a) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #6 RFAddReader PCSC/src/readerfactory.c:366:7 (pcscd+0xdb52a) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #7 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe3409) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #8 HPScanUSB PCSC/src/hotplug_libudev.c:579:3 (pcscd+0xe2a1d) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #9 HPRegisterForHotplugEvents PCSC/src/hotplug_libudev.c:761:2 (pcscd+0xe2a1d)
    #10 main PCSC/src/pcscdaemon.c:768:7 (pcscd+0xd8717) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

  Thread T7 (tid=4049, running) created by thread T4 at:
    #0 pthread_create <null> (pcscd+0x53dfd) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #1 ThreadCreate PCSC/src/utils.c:184:8 (pcscd+0xe3cab) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #2 EHSpawnEventHandler PCSC/src/eventhandler.c:233:7 (pcscd+0xd6840) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #3 RFAddReader PCSC/src/readerfactory.c:397:8 (pcscd+0xdb6ba) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #4 HPAddDevice PCSC/src/hotplug_libudev.c:512:8 (pcscd+0xe3409) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)
    #5 HPEstablishUSBNotifications PCSC/src/hotplug_libudev.c:646:6 (pcscd+0xe3783) (BuildId: 046d0874ce19c882d4f3b8ab5213aa4cd336cd5e)

SUMMARY: ThreadSanitizer: data race CCID/src/utils.c:81:21 in ReleaseReaderIndex
==================
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@martinpaljak @LudovicRousseau