* Implemented flock() semantics to the advisory locking backend. Not tested

(must also compare to BSD; I've looked at their sources, but I might have
  missed something).
* Added sys/file.h and the flock() system call.
* common_fcntl() could forget to put back the file descriptor on some error
  conditions (I guess we should introduce and use a DescriptorGetter class).
* Cleaned up fcntl.h, moved the BSD extensions S_IREAD and S_IWRITE to
  sys/stat.h where they belong, and added the missing S_IEXEC to them.
* Added some more comments.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23836 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/syscalls.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2004-2007, Haiku Inc. All rights reserved.
+ * Copyright 2004-2008, Haiku Inc. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _KERNEL_SYSCALLS_H
@@ -151,6 +151,7 @@ extern int			_kern_open_parent_dir(int fd, char *name,
 						size_t nameLength);
 extern status_t		_kern_fcntl(int fd, int op, uint32 argument);
 extern status_t		_kern_fsync(int fd);
+extern status_t		_kern_flock(int fd, int op);
 extern off_t		_kern_seek(int fd, off_t pos, int seekType);
 extern status_t		_kern_create_dir_entry_ref(dev_t device, ino_t inode, const char *name, int perms);
 extern status_t		_kern_create_dir(int fd, const char *path, int perms);