compat.h: added a set of extras for FreeBSD <> Linux compatability

If this file is used, it is wise to include it a fist include file
at the top of the code.

Things added to compat.h:
 - ENODATA versus ENOATTR
   This is a very tricky one since ENOATTR is also defined in boost,
   but with a totally diferent value again. We need to make sure
   that the same value is used alt all places.
 - O_DSYNC(freeBSD) versus O_SYNC(Linux)
   fortunately they have the same value.
 - HOST_NAME_MAX is undefined in FreeBSD
   So hardcoded to the value that Linux uses
 - pthread_set_name_np(FreeBSD) versus pthread_setname_np(Linux)
   and the NON-Posix code lives in a separate include file
 - Some compatiblility code for CLOCK_MONOTONIC_COARSE to rewite
   to the FreeBSD equivalent CLOCK_MONOTONIC_FAST

compat.h is added to:
 * src/common/Thread.cc
 * src/common/obj_bencher.cc
 * src/crush/CrushLocation.cc
 * src/include/compat.h
 * src/include/rados/librados.h
 * src/os/filestore/FileStore.cc
 * src/test/system/systest_runnable.cc

Signed-off-by: Willem Jan Withagen <wjw@digiware.nl>

7 files changed, 55 insertions, 5 deletions

diff --git a/src/common/Thread.cc b/src/common/Thread.cc
index c1c3be5bf7e..16591157d11 100644
--- a/src/common/Thread.cc
+++ b/src/common/Thread.cc
@@ -12,6 +12,7 @@
  *
  */
 
+#include "include/compat.h"
 #include "common/Thread.h"
 #include "common/code_environment.h"
 #include "common/debug.h"
@@ -22,6 +23,7 @@
 #include <errno.h>
 #include <iostream>
 #include <pthread.h>
+
 #include <signal.h>
 #include <sstream>
 #include <stdlib.h>
diff --git a/src/common/obj_bencher.cc b/src/common/obj_bencher.cc
index 0971ec9c0c9..b4ebc03183f 100644
--- a/src/common/obj_bencher.cc
+++ b/src/common/obj_bencher.cc
@@ -15,6 +15,7 @@
  * try and bench on a pool you don't have permission to access
  * it will just loop forever.
  */
+#include "include/compat.h"
 #include "common/Cond.h"
 #include "obj_bencher.h"
 
diff --git a/src/crush/CrushLocation.cc b/src/crush/CrushLocation.cc
index de648bc6241..310f14879de 100644
--- a/src/crush/CrushLocation.cc
+++ b/src/crush/CrushLocation.cc
@@ -1,6 +1,7 @@
 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
 // vim: ts=8 sw=2 smarttab
 
+#include "include/compat.h"
 #include "CrushLocation.h"
 #include "CrushWrapper.h"
 #include "common/config.h"
diff --git a/src/include/compat.h b/src/include/compat.h
index ec5905c82cd..1df098bc42f 100644
--- a/src/include/compat.h
+++ b/src/include/compat.h
@@ -13,8 +13,56 @@
 #define CEPH_COMPAT_H
 
 #if defined(__FreeBSD__)
+
+/* Make sure that ENODATA is defined in the correct way */
+#ifndef ENODATA
 #define	ENODATA	ENOATTR
+#else
+#if (ENODATA == 9919)
+// #warning ENODATA already defined to be 9919, redefining to fix
+// Silencing this warning because it fires at all files where compat.h
+// is included after boost files.
+//
+// This value stems from the definition in the boost library
+// And when this case occurs it is due to the fact that boost files
+// are included before this file. Redefinition might not help in this
+// case since already parsed code has evaluated to the wrong value.
+// This would warrrant for d definition that would actually be evaluated
+// at the location of usage and report a possible confict.
+// This is left up to a future improvement
+#elif (ENODATA != 87)
+#warning ENODATA already defined to a value different from 87 (ENOATRR), refining to fix
+#endif
+#undef ENODATA
+#define ENODATA ENOATTR
+#endif
+
+#ifndef MSG_MORE
 #define	MSG_MORE 0
+#endif
+
+#ifndef O_DSYNC
+#define O_DSYNC O_SYNC
+#endif
+
+#ifndef HOST_NAME_MAX
+#define HOST_NAME_MAX 64
+#endif
+
+// Fix clock accuracy
+#if !defined(CLOCK_MONOTONIC_COARSE)
+#if defined(CLOCK_MONOTONIC_FAST)
+#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC_FAST
+#else
+#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
+#endif
+#endif
+
+/* Fix a small name diff */
+#define pthread_setname_np pthread_set_name_np
+/* And include the extra required include file */
+#include <pthread_np.h>
+
 #endif /* !__FreeBSD__ */
 
 #if defined(__APPLE__)
diff --git a/src/include/rados/librados.h b/src/include/rados/librados.h
index b3d4818374e..d72f9e602f8 100644
--- a/src/include/rados/librados.h
+++ b/src/include/rados/librados.h
@@ -19,6 +19,7 @@
 extern "C" {
 #endif
 
+#include "../compat.h"
 #include <netinet/in.h>
 #if defined(__linux__)
 #include <linux/types.h>
diff --git a/src/os/filestore/FileStore.cc b/src/os/filestore/FileStore.cc
index 7939dfc195f..c34a722f01a 100644
--- a/src/os/filestore/FileStore.cc
+++ b/src/os/filestore/FileStore.cc
@@ -12,6 +12,7 @@
  * Foundation.  See file COPYING.
  *
  */
+#include "include/compat.h"
 #include "include/int_types.h"
 
 #include <unistd.h>
@@ -31,7 +32,6 @@
 #include <iostream>
 #include <map>
 
-#include "include/compat.h"
 #include "include/linux_fiemap.h"
 
 #include "common/xattr.h"
diff --git a/src/test/system/systest_runnable.cc b/src/test/system/systest_runnable.cc
index c7ed6aa72a2..95453391207 100644
--- a/src/test/system/systest_runnable.cc
+++ b/src/test/system/systest_runnable.cc
@@ -12,6 +12,7 @@
  *
  */
 
+#include "include/compat.h"
 #include "common/errno.h"
 #include "include/atomic.h"
 #include "systest_runnable.h"
@@ -31,10 +32,6 @@
 #include <unistd.h>
 #include <vector>
 
-#if defined(__FreeBSD__)
-#include <pthread_np.h>
-#endif
-
 using std::ostringstream;
 using std::string;