ChangeLog:

	* configure.ac [AC_CHECK_FUNCS]: Check for readlink.
	* config.in, configure: Regenerate.

	* target.h (struct target_ops): Add to_fileio_readlink.
	(target_fileio_readlink): Add prototype.
	* target.c (target_fileio_readlink): New function.

	* inf-child.c: Conditionally include <sys/param.h>.
	(inf_child_fileio_readlink): New function.
	(inf_child_target): Install it.

	* remote.c (PACKET_vFile_readlink): New enum value.
	(remote_hostio_readlink): New function.
	(init_remote_ops): Install it.
	(_initialize_remote): Handle vFile:readlink packet type.

doc/ChangeLog:

	* gdb.texinfo (Remote Configuration): Document
	"set remote hostio-readlink-packet" command.
	(General Query Packets): Document vFile:readlink packet.

gdbserver/ChangeLog:

	* hostio.c (handle_readlink): New function.
	(handle_vFile): Call it to handle "vFile:readlink" packets.

2 files changed, 38 insertions, 0 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 72f0286..0cb67da 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,8 @@
+2012-01-20  Ulrich Weigand  <ulrich.weigand@linaro.org>
+
+	* hostio.c (handle_readlink): New function.
+	(handle_vFile): Call it to handle "vFile:readlink" packets.
+
 2012-01-20  Pedro Alves  <palves@redhat.com>
 	    Ulrich Weigand  <ulrich.weigand@linaro.org>
 
diff --git a/gdb/gdbserver/hostio.c b/gdb/gdbserver/hostio.c
index b1508ec..34e4fa8 100644
--- a/gdb/gdbserver/hostio.c
+++ b/gdb/gdbserver/hostio.c
@@ -456,6 +456,37 @@ handle_unlink (char *own_buf)
   hostio_reply (own_buf, ret);
 }
 
+static void
+handle_readlink (char *own_buf, int *new_packet_len)
+{
+  char filename[PATH_MAX], linkname[PATH_MAX];
+  char *p;
+  int ret, bytes_sent;
+
+  p = own_buf + strlen ("vFile:readlink:");
+
+  if (require_filename (&p, filename)
+      || require_end (p))
+    {
+      hostio_packet_error (own_buf);
+      return;
+    }
+
+  ret = readlink (filename, linkname, sizeof linkname);
+  if (ret == -1)
+    {
+      hostio_error (own_buf);
+      return;
+    }
+
+  bytes_sent = hostio_reply_with_data (own_buf, linkname, ret, new_packet_len);
+
+  /* If the response does not fit into a single packet, do not attempt
+     to return a partial response, but simply fail.  */
+  if (bytes_sent < ret)
+    sprintf (own_buf, "F-1,%x", FILEIO_ENAMETOOLONG);
+}
+
 /* Handle all the 'F' file transfer packets.  */
 
 int
@@ -471,6 +502,8 @@ handle_vFile (char *own_buf, int packet_len, int *new_packet_len)
     handle_close (own_buf);
   else if (strncmp (own_buf, "vFile:unlink:", 13) == 0)
     handle_unlink (own_buf);
+  else if (strncmp (own_buf, "vFile:readlink:", 15) == 0)
+    handle_readlink (own_buf, new_packet_len);
   else
     return 0;