syscalls/getrandom: add configure check for linux/random.h

Old distros (such as RHEL5.6) break, when they try to include
some kernel headers directly. Add configure check to make sure
linux/random.h kernel header can be compiled without errors.

Signed-off-by: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>

configure.ac

@@ -176,5 +176,6 @@ LTP_CHECK_TIMERFD
 LTP_CHECK_CAN_SUPPORT
 LTP_CHECK_IOVEC
 LTP_CHECK_KEYCTL
+LTP_CHECK_LINUXRANDOM
 
 AC_OUTPUT

include/lapi/getrandom.h

@@ -19,6 +19,12 @@
 #ifndef __GETRANDOM_H__
 #define __GETRANDOM_H__
 
+#include "config.h"
+
+#if HAVE_LINUX_RANDOM_H
+#include <linux/random.h>
+#endif
+
 /*
  * Flags for getrandom(2)
  *

m4/ltp-linuxrandom.m4

@@ -0,0 +1,21 @@
+dnl
+dnl Copyright (c) Linux Test Project, 2015
+dnl
+dnl This program is free software;  you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2 of the License, or
+dnl (at your option) any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY;  without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+dnl the GNU General Public License for more details.
+dnl
+
+dnl
+dnl LTP_CHECK_LINUXRANDOM
+dnl ----------------------------
+dnl
+AC_DEFUN([LTP_CHECK_LINUXRANDOM],[
+AC_CHECK_HEADERS(linux/random.h, [], [], [])]
+)

testcases/kernel/syscalls/getrandom/getrandom01.c

@@ -26,7 +26,6 @@
  *
  */
 
-#include <linux/random.h>
 #include "lapi/getrandom.h"
 #include "linux_syscall_numbers.h"
 #include "test.h"

testcases/kernel/syscalls/getrandom/getrandom02.c

@@ -27,7 +27,6 @@
  *
  */
 
-#include <linux/random.h>
 #include "lapi/getrandom.h"
 #include "linux_syscall_numbers.h"
 #include "test.h"

testcases/kernel/syscalls/getrandom/getrandom03.c

@@ -30,7 +30,6 @@
  *  number of bytes required and expects success.
  */
 
-#include <linux/random.h>
 #include "lapi/getrandom.h"
 #include "linux_syscall_numbers.h"
 #include "test.h"

testcases/kernel/syscalls/getrandom/getrandom04.c

@@ -30,7 +30,6 @@
  *  descriptors to 3 and expects success.
  */
 
-#include <linux/random.h>
 #include <sys/resource.h>
 #include "lapi/getrandom.h"
 #include "linux_syscall_numbers.h"