Merge branch 'upstream' into dfsg-orig

[debian/gnuradio] / gr-howto-write-a-block / config / gr_sysv_shm.m4

diff --git a/gr-howto-write-a-block/config/gr_sysv_shm.m4 b/gr-howto-write-a-block/config/gr_sysv_shm.m4
new file mode 100644 (file)
index 0000000..db5c835
--- /dev/null
+++ b/gr-howto-write-a-block/config/gr_sysv_shm.m4
@@ -0,0 +1,36 @@
+# Check for IPC System V shm support.             -*- Autoconf -*-
+
+# Copyright 2003 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Boston, MA
+# 02110-1301, USA.
+
+AC_DEFUN([GR_SYSV_SHM],
+[
+       AC_LANG_SAVE
+       AC_LANG_C
+
+       AC_CHECK_HEADERS([sys/ipc.h sys/shm.h])
+
+        save_LIBS="$LIBS"
+       AC_SEARCH_LIBS(shmat, [cygipc ipc],
+         [ IPC_LIBS="$LIBS" ],
+         [ AC_MSG_WARN([SystemV IPC support not found. ]) ]
+       )
+        LIBS="$save_LIBS"
+
+       AC_LANG_RESTORE
+       AC_SUBST(IPC_LIBS)
+])