Introduce nat/linux-namespaces.[ch]

This commit introduces new shared files nat/linux-namespaces.[ch]
containing code to support Linux namespaces that will be used by
both GDB and gdbserver.

gdb/ChangeLog:

	* configure.ac (AC_CHECK_FUNCS): Add setns.
	* config.in: Regenerate.
	* configure: Likewise.
	* nat/linux-namespaces.h: New file.
	* nat/linux-namespaces.c: Likewise.
	* Makefile.in (HFILES_NO_SRCDIR): Add nat/linux-namespaces.h.
	(linux-namespaces.o): New rule.
	* config/aarch64/linux.mh (NATDEPFILES): Add linux-namespaces.o.
	* config/alpha/alpha-linux.mh (NATDEPFILES): Likewise.
	* config/arm/linux.mh (NATDEPFILES): Likewise.
	* config/i386/linux.mh (NATDEPFILES): Likewise.
	* config/i386/linux64.mh (NATDEPFILES): Likewise.
	* config/ia64/linux.mh (NATDEPFILES): Likewise.
	* config/m32r/linux.mh (NATDEPFILES): Likewise.
	* config/m68k/linux.mh (NATDEPFILES): Likewise.
	* config/mips/linux.mh (NATDEPFILES): Likewise.
	* config/pa/linux.mh (NATDEPFILES): Likewise.
	* config/powerpc/linux.mh (NATDEPFILES): Likewise.
	* config/powerpc/ppc64-linux.mh (NATDEPFILES): Likewise.
	* config/powerpc/spu-linux.mh (NATDEPFILES): Likewise.
	* config/s390/linux.mh (NATDEPFILES): Likewise.
	* config/sparc/linux.mh (NATDEPFILES): Likewise.
	* config/sparc/linux64.mh (NATDEPFILES): Likewise.
	* config/tilegx/linux.mh (NATDEPFILES): Likewise.
	* config/xtensa/linux.mh (NATDEPFILES): Likewise.

gdb/gdbserver/ChangeLog:

	* configure.ac (AC_CHECK_FUNCS): Add setns.
	* config.in: Regenerate.
	* configure: Likewise.
	* Makefile.in (SFILES): Add nat/linux-namespaces.c.
	(linux-namespaces.o): New rule.
	* configure.srv (srv_linux_obj): Add linux-namespaces.o.

6 files changed, 19 insertions, 4 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 4c2c52f..cb21f4b 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,12 @@
+2015-06-10  Gary Benson  <gbenson@redhat.com>
+
+	* configure.ac (AC_CHECK_FUNCS): Add setns.
+	* config.in: Regenerate.
+	* configure: Likewise.
+	* Makefile.in (SFILES): Add nat/linux-namespaces.c.
+	(linux-namespaces.o): New rule.
+	* configure.srv (srv_linux_obj): Add linux-namespaces.o.
+
 2015-06-09  Gary Benson <gbenson@redhat.com>
 
 	* hostio.c (handle_open): Process mode argument with
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index a981ee8..fc250fb 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -180,7 +180,7 @@ SFILES=	$(srcdir)/gdbreplay.c $(srcdir)/inferiors.c $(srcdir)/dll.c \
 	$(srcdir)/common/common-debug.c $(srcdir)/common/cleanups.c \
 	$(srcdir)/common/common-exceptions.c $(srcdir)/symbol.c \
 	$(srcdir)/common/btrace-common.c \
-	$(srcdir)/common/fileio.c
+	$(srcdir)/common/fileio.c $(srcdir)/nat/linux-namespaces.c
 
 DEPFILES = @GDBSERVER_DEPFILES@
 
@@ -615,6 +615,9 @@ x86-linux.o: ../nat/x86-linux.c
 x86-linux-dregs.o: ../nat/x86-linux-dregs.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)
+linux-namespaces.o: ../nat/linux-namespaces.c
+	$(COMPILE) $<
+	$(POSTCOMPILE)
 
 aarch64.c : $(srcdir)/../regformats/aarch64.dat $(regdat_sh)
 	$(SHELL) $(regdat_sh) $(srcdir)/../regformats/aarch64.dat aarch64.c
diff --git a/gdb/gdbserver/config.in b/gdb/gdbserver/config.in
index 9359ce5..f24e6bb 100644
--- a/gdb/gdbserver/config.in
+++ b/gdb/gdbserver/config.in
@@ -186,6 +186,9 @@
 /* Define to 1 if you have the `pwrite' function. */
 #undef HAVE_PWRITE
 
+/* Define to 1 if you have the `setns' function. */
+#undef HAVE_SETNS
+
 /* Define to 1 if you have the <sgtty.h> header file. */
 #undef HAVE_SGTTY_H
 
diff --git a/gdb/gdbserver/configure b/gdb/gdbserver/configure
index b5a2f85..e8cf136 100755
--- a/gdb/gdbserver/configure
+++ b/gdb/gdbserver/configure
@@ -5310,7 +5310,7 @@ fi
 
 done
 
-for ac_func in getauxval pread pwrite pread64
+for ac_func in getauxval pread pwrite pread64 setns
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
diff --git a/gdb/gdbserver/configure.ac b/gdb/gdbserver/configure.ac
index efbb346..b465c43 100644
--- a/gdb/gdbserver/configure.ac
+++ b/gdb/gdbserver/configure.ac
@@ -94,7 +94,7 @@ AC_CHECK_HEADERS(sgtty.h termio.h termios.h sys/reg.h string.h dnl
 		 fcntl.h signal.h sys/file.h dnl
 		 sys/ioctl.h netinet/in.h sys/socket.h netdb.h dnl
 		 netinet/tcp.h arpa/inet.h)
-AC_CHECK_FUNCS(getauxval pread pwrite pread64)
+AC_CHECK_FUNCS(getauxval pread pwrite pread64 setns)
 
 GDB_AC_COMMON
 
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index 81dd235..7f89f2f 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -42,7 +42,7 @@ srv_amd64_linux_xmlfiles="i386/amd64-linux.xml i386/amd64-avx-linux.xml i386/amd
 
 # Linux object files.  This is so we don't have to repeat
 # these files over and over again.
-srv_linux_obj="linux-low.o linux-osdata.o linux-procfs.o linux-ptrace.o linux-waitpid.o linux-personality.o"
+srv_linux_obj="linux-low.o linux-osdata.o linux-procfs.o linux-ptrace.o linux-waitpid.o linux-personality.o linux-namespaces.o"
 
 # Input is taken from the "${target}" variable.