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[PATCH 3/3 v3] Implement vFile:fstat: packet in gdbserver


This patch adds a new packet "vFile:fstat:" to gdbserver.
This can be used by clients to retrieve information about
open files.

This was patch 2/3 in the original series, but it's been
moved to the end.  Also, all documentation has been moved
into what is now patch 2/3, the patch that adds the GDB side.

handle_fstat has been updated to fail with E01 if the response
doesn't fit in a single packet.

gdb/gdbserver/ChangeLog:

	* hostio.c (sys/types.h): New include.
	(sys/stat.h): Likewise.
	(common-remote-fileio.h): Likewise.
	(handle_fstat): New function.
	(handle_vFile): Handle vFile:fstat packets.
	* server.c (handle_query): Report vFile:fstat as supported.
---
 gdb/gdbserver/ChangeLog |    9 +++++++++
 gdb/gdbserver/hostio.c  |   41 +++++++++++++++++++++++++++++++++++++++++
 gdb/gdbserver/server.c  |    2 ++
 3 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/gdb/gdbserver/hostio.c b/gdb/gdbserver/hostio.c
index ec29eb9..df43e27 100644
--- a/gdb/gdbserver/hostio.c
+++ b/gdb/gdbserver/hostio.c
@@ -25,6 +25,9 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "common-remote-fileio.h"
 
 extern int remote_debug;
 
@@ -412,6 +415,42 @@ handle_pwrite (char *own_buf, int packet_len)
 }
 
 static void
+handle_fstat (char *own_buf, int *new_packet_len)
+{
+  int fd, bytes_sent;
+  char *p;
+  struct stat st;
+  struct fio_stat fst;
+
+  p = own_buf + strlen ("vFile:fstat:");
+
+  if (require_int (&p, &fd)
+      || require_valid_fd (fd)
+      || require_end (p))
+    {
+      hostio_packet_error (own_buf);
+      return;
+    }
+
+  if (fstat (fd, &st) == -1)
+    {
+      hostio_error (own_buf);
+      return;
+    }
+
+  remote_fileio_to_fio_stat (&st, &fst);
+
+  bytes_sent = hostio_reply_with_data (own_buf,
+				       (char *) &fst, sizeof (fst),
+				       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 < sizeof (fst))
+    strcpy (own_buf, "E01");
+}
+
+static void
 handle_close (char *own_buf)
 {
   int fd, ret;
@@ -517,6 +556,8 @@ handle_vFile (char *own_buf, int packet_len, int *new_packet_len)
     handle_pread (own_buf, new_packet_len);
   else if (startswith (own_buf, "vFile:pwrite:"))
     handle_pwrite (own_buf, packet_len);
+  else if (startswith (own_buf, "vFile:fstat:"))
+    handle_fstat (own_buf, new_packet_len);
   else if (startswith (own_buf, "vFile:close:"))
     handle_close (own_buf);
   else if (startswith (own_buf, "vFile:unlink:"))
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index 4189877..4d8faa3 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -2082,6 +2082,8 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
       if (target_supports_stopped_by_hw_breakpoint ())
 	strcat (own_buf, ";hwbreak+");
 
+      strcat (own_buf, ";vFile:fstat+");
+
       return;
     }
 
-- 
1.7.1


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