Fix: implement time.h wrapper for FD_ISSET

Kernels v3.4.0 to v3.4.7 still define FD_ISSET, but __FD_ISSET has been
removed. Therefore, we cannot use the FD_ISSET define to find out of we
need to use the new close_on_exec(). Implement a wrapper based on kernel
version detection instead.

Fixes #872

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/lttng-statedump-impl.c b/lttng-statedump-impl.c
index cf92aa44689a4587cc6ab4f0cd4cd441f4abb71b..b525a815c569087eeae7dbf3e32135ed7ca1f1b9 100644 (file)
--- a/lttng-statedump-impl.c
+++ b/lttng-statedump-impl.c
@@ -56,6 +56,7 @@
 #include "wrapper/irq.h"
 #include "wrapper/tracepoint.h"
 #include "wrapper/genhd.h"
+#include "wrapper/time.h"
 
 #ifdef CONFIG_LTTNG_HAS_LIST_IRQ
 #include <linux/irq.h>
@@ -213,18 +214,6 @@ int lttng_enumerate_network_ip_interface(struct lttng_session *session)
 }
 #endif /* CONFIG_INET */
 
-#ifdef FD_ISSET        /* For old kernels lacking close_on_exec() */
-static inline bool lttng_close_on_exec(int fd, const struct fdtable *fdt)
-{
-       return FD_ISSET(fd, fdt->close_on_exec);
-}
-#else
-static inline bool lttng_close_on_exec(int fd, const struct fdtable *fdt)
-{
-       return close_on_exec(fd, fdt);
-}
-#endif
-
 static
 int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
 {

diff --git a/wrapper/time.h b/wrapper/time.h
new file mode 100644 (file)
index 0000000..f33791f
--- /dev/null
+++ b/wrapper/time.h
@@ -0,0 +1,43 @@
+#ifndef _LTTNG_WRAPPER_TIME_H
+#define _LTTNG_WRAPPER_TIME_H
+
+/*
+ * wrapper/time.h
+ *
+ * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/version.h>
+#include <linux/time.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
+
+static inline bool lttng_close_on_exec(int fd, const struct fdtable *fdt)
+{
+       return close_on_exec(fd, fdt);
+}
+
+#else
+
+static inline bool lttng_close_on_exec(int fd, const struct fdtable *fdt)
+{
+       return FD_ISSET(fd, fdt->close_on_exec);
+}
+
+#endif
+
+#endif /* _LTTNG_WRAPPER_TIME_H */