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[ob 7.10 PATCH] Fix build issue with nat/linux-namespaces.c

Hi all,

This commit was pushed to gdb/master on July 14 but not pushed to
7.10.  It fixes a build issue on systems with a prototype for setns
in their header files but no working setns is detected by configure.
Pushed to 7.10 as obvious.



	PR gdb/18957
	* nat/linux-namespaces.c (setns): Rename from this ...
	(do_setns): ... to this.  Support calling setns if it exists.
	(mnsh_handle_setns): Call do_setns.
 gdb/ChangeLog              |    7 +++++++
 gdb/nat/linux-namespaces.c |   12 ++++++------
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/gdb/nat/linux-namespaces.c b/gdb/nat/linux-namespaces.c
index 6fb0a2b..4341429 100644
--- a/gdb/nat/linux-namespaces.c
+++ b/gdb/nat/linux-namespaces.c
@@ -34,18 +34,18 @@ int debug_linux_namespaces;
 /* Handle systems without setns.  */
-#ifndef HAVE_SETNS
-static int
-setns (int fd, int nstype)
+static inline int
+do_setns (int fd, int nstype)
-#ifdef __NR_setns
+#ifdef HAVE_SETNS
+  return setns (fd, nstype);
+#elif defined __NR_setns
   return syscall (__NR_setns, fd, nstype);
   errno = ENOSYS;
   return -1;
 /* Handle systems without MSG_CMSG_CLOEXEC.  */
@@ -495,7 +495,7 @@ mnsh_recv_message (int sock, enum mnsh_msg_type *type,
 static ssize_t
 mnsh_handle_setns (int sock, int fd, int nstype)
-  int result = setns (fd, nstype);
+  int result = do_setns (fd, nstype);
   return mnsh_return_int (sock, result, errno);

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