Big commit: Added symlink support to the kernel.

- added needed syscalls to access symlink support from userland
- implemented lstat(), symlink(), and readlink()
- added dev_t to ktypes.h (for now - should be in a public header anyway)
- added symlink support to the "ls" command (now calls lstat() and shows the
  link target with the -l option)
- changed the sys_read_stat() call to support symlinks, and updated files
  using that function (it gets an extra argument: bool traverseLink)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@560 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/ksyscalls.h

@@ -22,8 +22,8 @@ enum {
 	SYSCALL_CREATE,
 	SYSCALL_UNLINK,
 	SYSCALL_RENAME,
-	SYSCALL_RSTAT,
-	SYSCALL_WSTAT,
+	SYSCALL_READ_STAT,
+	SYSCALL_WRITE_STAT,
 	SYSCALL_SYSTEM_TIME,
 	SYSCALL_SNOOZE,
 	SYSCALL_SEM_CREATE,
@@ -82,7 +82,7 @@ enum {
 	SYSCALL_SYSCTL,
 	SYSCALL_SOCKET,
 	SYSCALL_GETDTABLESIZE,
-	SYSCALL_FSTAT,
+	SYSCALL_FD_STAT,
 	SYSCALL_READ_DIR,
 	SYSCALL_REWIND_DIR,
 	SYSCALL_OPEN_DIR,
@@ -93,7 +93,9 @@ enum {
 	SYSCALL_OPEN_DIR_ENTRY_REF,
 	SYSCALL_OPEN_DIR_NODE_REF,
 	SYSCALL_CREATE_ENTRY_REF,
-	SYSCALL_CREATE_DIR_ENTRY_REF
+	SYSCALL_CREATE_DIR_ENTRY_REF,
+	SYSCALL_CREATE_SYMLINK,
+	SYSCALL_READ_LINK,
 };
 
 int syscall_dispatcher(unsigned long call_num, void *arg_buffer, uint64 *call_ret);