ntdll: Use struct mtget.mt_blkno on those systems providing that (and

avoid using struct mtpos which may not be present on such systems).

configure

@@ -18299,6 +18299,119 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
+fi
+echo "$as_me:$LINENO: checking for struct mtget.mt_blkno" >&5
+echo $ECHO_N "checking for struct mtget.mt_blkno... $ECHO_C" >&6
+if test "${ac_cv_member_struct_mtget_mt_blkno+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#ifdef HAVE_SYS_MTIO_H
+#include <sys/mtio.h>
+#endif
+
+int
+main ()
+{
+static struct mtget ac_aggr;
+if (ac_aggr.mt_blkno)
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_member_struct_mtget_mt_blkno=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#ifdef HAVE_SYS_MTIO_H
+#include <sys/mtio.h>
+#endif
+
+int
+main ()
+{
+static struct mtget ac_aggr;
+if (sizeof ac_aggr.mt_blkno)
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_member_struct_mtget_mt_blkno=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_member_struct_mtget_mt_blkno=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+echo "$as_me:$LINENO: result: $ac_cv_member_struct_mtget_mt_blkno" >&5
+echo "${ECHO_T}$ac_cv_member_struct_mtget_mt_blkno" >&6
+if test $ac_cv_member_struct_mtget_mt_blkno = yes; then
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_STRUCT_MTGET_MT_BLKNO 1
+_ACEOF
+
+
 fi
 
 

configure.ac

@@ -1428,7 +1428,7 @@ dnl Check for siginfo_t members
 AC_CHECK_MEMBERS([siginfo_t.si_fd],,,[#include <signal.h>])
 
 dnl Check for struct mtget members
-AC_CHECK_MEMBERS([struct mtget.mt_blksiz, struct mtget.mt_gstat],,,
+AC_CHECK_MEMBERS([struct mtget.mt_blksiz, struct mtget.mt_gstat, struct mtget.mt_blkno],,,
 [#ifdef HAVE_SYS_MTIO_H
 #include <sys/mtio.h>
 #endif])

dlls/ntdll/tape.c

@@ -238,7 +238,9 @@ static NTSTATUS TAPE_GetPosition( int fd, ULONG type, TAPE_GET_POSITION *data )
 {
 #ifdef HAVE_SYS_MTIO_H
     struct mtget get;
+#ifndef HAVE_STRUCT_MTGET_MT_BLKNO
     struct mtpos pos;
+#endif
     NTSTATUS status;
 
     TRACE( "fd: %d type: 0x%08lx\n", fd, type );
@@ -249,16 +251,22 @@ static NTSTATUS TAPE_GetPosition( int fd, ULONG type, TAPE_GET_POSITION *data )
     if (status != STATUS_SUCCESS)
         return status;
 
+#ifndef HAVE_STRUCT_MTGET_MT_BLKNO
     status = TAPE_GetStatus( ioctl( fd, MTIOCPOS, &pos ) );
     if (status != STATUS_SUCCESS)
         return status;
+#endif
 
     switch (type)
     {
     case TAPE_ABSOLUTE_BLOCK:
         data->Type = type;
         data->Partition = get.mt_resid;
+#ifdef HAVE_STRUCT_MTGET_MT_BLKNO
+        data->OffsetLow = get.mt_blkno;
+#else
         data->OffsetLow = pos.mt_blkno;
+#endif
         break;
     case TAPE_LOGICAL_BLOCK:
     case TAPE_PSEUDO_LOGICAL_BLOCK:

include/config.h.in

@@ -614,6 +614,9 @@
 /* Define to 1 if `msg_accrights' is member of `struct msghdr'. */
 #undef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 
+/* Define to 1 if `mt_blkno' is member of `struct mtget'. */
+#undef HAVE_STRUCT_MTGET_MT_BLKNO
+
 /* Define to 1 if `mt_blksiz' is member of `struct mtget'. */
 #undef HAVE_STRUCT_MTGET_MT_BLKSIZ