Implement vFile:fstat: in gdbserver

This commit implements the "vFile:fstat:" packet in gdbserver.

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.

3 files changed, 52 insertions, 0 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 1a57867..6b0492a 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,5 +1,14 @@
 2015-03-11  Gary Benson  <gbenson@redhat.com>
 
+	* 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.
+
+2015-03-11  Gary Benson  <gbenson@redhat.com>
+
 	* configure.ac (AC_CHECK_MEMBERS): Add checks for
 	struct stat.st_blocks and struct stat.st_blksize.
 	* configure: Regenerate.
diff --git a/gdb/gdbserver/hostio.c b/gdb/gdbserver/hostio.c
index ec29eb9..aa659e2 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))
+    write_enn (own_buf);
+}
+
+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 08dbb60..9ff2f8e 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;
     }