# Patch from GPGTools/MacGPG2 repo
# https://github.com/GPGTools/MacGPG2/blob/dev/patches/gnupg/scdaemon_shared-access.patch
# Add the option "shared-access" to scdaemon.
# If set, pcsc_connect is called with PCSC_SHARE_SHARED instead of PCSC_SHARE_EXCLUSIVE.


--- a/scd/apdu.c
+++ b/scd/apdu.c
@@ -816,7 +816,7 @@ connect_pcsc_card (int slot)

   err = pcsc_connect (reader_table[slot].pcsc.context,
                       reader_table[slot].rdrname,
-                      PCSC_SHARE_EXCLUSIVE,
+                      opt.shared_access ? PCSC_SHARE_SHARED : PCSC_SHARE_EXCLUSIVE,
                       PCSC_PROTOCOL_T0|PCSC_PROTOCOL_T1,
                       &reader_table[slot].pcsc.card,
                       &reader_table[slot].pcsc.protocol);
--- a/scd/scdaemon.c
+++ b/scd/scdaemon.c
@@ -99,6 +99,7 @@ enum cmd_and_opt_values
   oDenyAdmin,
   oDisableApplication,
   oEnablePinpadVarlen,
+  oSharedAccess,
   oListenBacklog,

   oNoop
@@ -164,6 +165,8 @@ static ARGPARSE_OPTS opts[] = {
   /* Stubs for options which are implemented by 2.3 or later.  */
   ARGPARSE_s_s (oNoop, "application-priority", "@"),

+  ARGPARSE_s_n (oSharedAccess, "shared-access", N_("use PCSC_SHARE_SHARED for pcsc_connect")),
+
   ARGPARSE_end ()
 };

@@ -629,6 +632,8 @@ main (int argc, char **argv )

         case oNoop: break;

+        case oSharedAccess: opt.shared_access = 1; break;
+
         default:
           pargs.err = configfp? ARGPARSE_PRINT_WARNING:ARGPARSE_PRINT_ERROR;
           break;
@@ -727,6 +732,7 @@ main (int argc, char **argv )
       es_printf ("disable-pinpad:%lu:\n", GC_OPT_FLAG_NONE );
       es_printf ("card-timeout:%lu:%d:\n", GC_OPT_FLAG_DEFAULT, 0);
       es_printf ("enable-pinpad-varlen:%lu:\n", GC_OPT_FLAG_NONE );
+      es_printf ("shared-access:%lu:\n", GC_OPT_FLAG_NONE );

       scd_exit (0);
     }
--- a/scd/scdaemon.h
+++ b/scd/scdaemon.h
@@ -62,6 +62,8 @@ struct
   strlist_t disabled_applications;  /* Card applications we do not
                                        want to use. */
   unsigned long card_timeout; /* Disconnect after N seconds of inactivity.  */
+
+  int shared_access;
 } opt;


--- a/tools/gpgconf-comp.c
+++ b/tools/gpgconf-comp.c
@@ -653,6 +653,9 @@ static gc_option_t gc_options_scdaemon[] =
    { "card-timeout", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
      "gnupg", "|N|disconnect the card after N seconds of inactivity",
      GC_ARG_TYPE_UINT32, GC_BACKEND_SCDAEMON },
+   { "shared-access", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
+     "gnupg", "use PCSC_SHARE_SHARED for pcsc_connect",
+     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },

    { "Debug",
      GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,