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

src/kernel/Jamfile

@@ -351,6 +351,7 @@ KernelStaticLibraryObjects libc.a :
 	<$(SOURCE_GRIST)!libc!unistd>lseek.o
 	<$(SOURCE_GRIST)!libc!unistd>open.o
 	<$(SOURCE_GRIST)!libc!unistd>opendir.o
+	<$(SOURCE_GRIST)!libc!unistd>link.o
 	<$(SOURCE_GRIST)!libc!unistd>pread.o
 	<$(SOURCE_GRIST)!libc!unistd>pwrite.o
 	<$(SOURCE_GRIST)!libc!unistd>read.o
@@ -467,6 +468,7 @@ KernelLd libc.so :
 	<$(SOURCE_GRIST)!libc!unistd>lseek.o
 	<$(SOURCE_GRIST)!libc!unistd>open.o
 	<$(SOURCE_GRIST)!libc!unistd>opendir.o
+	<$(SOURCE_GRIST)!libc!unistd>link.o
 	<$(SOURCE_GRIST)!libc!unistd>pread.o
 	<$(SOURCE_GRIST)!libc!unistd>pwrite.o
 	<$(SOURCE_GRIST)!libc!unistd>read.o
@@ -585,6 +587,19 @@ KernelLd ls :
 	bin/ls
 	;
 
+KernelLd symlink :
+	libglue2.o
+	<$(SOURCE_GRIST)!apps!symlink>main.o
+	libc.so
+	libm.so
+	:
+	$(SUBDIR)/ldscripts/$(OBOS_ARCH)/app.ld
+	:
+	:
+	:
+	bin/symlink
+	;
+
 # Note: shell is a built in target, thus we need the grist.
 KernelLd obos_shell :
 	libglue2.o