Introduce target_fileio_fstat

This commit introduces a new target method target_fileio_fstat
which can be used to retrieve information about files opened with
target_fileio_open.

gdb/ChangeLog:

	* target.h (struct target_ops) <to_fileio_fstat>: New field.
	(target_fileio_fstat): New declaration.
	* target.c (target_fileio_fstat): New function.
	* inf-child.c (inf_child_fileio_fstat): Likewise.
	(inf_child_target): Initialize to_fileio_fstat.
	* remote.c (init_remote_ops): Likewise.

gdb/ChangeLog

@@ -1,3 +1,12 @@
+2015-04-02  Gary Benson <gbenson@redhat.com>
+
+	* target.h (struct target_ops) <to_fileio_fstat>: New field.
+	(target_fileio_fstat): New declaration.
+	* target.c (target_fileio_fstat): New function.
+	* inf-child.c (inf_child_fileio_fstat): Likewise.
+	(inf_child_target): Initialize to_fileio_fstat.
+	* remote.c (init_remote_ops): Likewise.
+
 2015-04-01  Sasha Smundak  <asmundak@google.com>
 
 	* Makefile.in (SUBDIR_PYTHON_OBJS): Add py-unwind.o.

gdb/inf-child.c

@@ -374,6 +374,20 @@ inf_child_fileio_pread (struct target_ops *self,
   return ret;
 }
 
+/* Implementation of to_fileio_fstat.  */
+static int
+inf_child_fileio_fstat (struct target_ops *self, int fd,
+			struct stat *sb, int *target_errno)
+{
+  int ret;
+
+  ret = fstat (fd, sb);
+  if (ret == -1)
+    *target_errno = inf_child_errno_to_fileio_error (errno);
+
+  return ret;
+}
+
 /* Close FD on the target.  Return 0, or -1 if an error occurs
    (and set *TARGET_ERRNO).  */
 static int
@@ -500,6 +514,7 @@ inf_child_target (void)
   t->to_fileio_open = inf_child_fileio_open;
   t->to_fileio_pwrite = inf_child_fileio_pwrite;
   t->to_fileio_pread = inf_child_fileio_pread;
+  t->to_fileio_fstat = inf_child_fileio_fstat;
   t->to_fileio_close = inf_child_fileio_close;
   t->to_fileio_unlink = inf_child_fileio_unlink;
   t->to_fileio_readlink = inf_child_fileio_readlink;

gdb/remote.c

@@ -11817,6 +11817,7 @@ Specify the serial device it is connected to\n\
   remote_ops.to_fileio_open = remote_hostio_open;
   remote_ops.to_fileio_pwrite = remote_hostio_pwrite;
   remote_ops.to_fileio_pread = remote_hostio_pread;
+  remote_ops.to_fileio_fstat = remote_hostio_fstat;
   remote_ops.to_fileio_close = remote_hostio_close;
   remote_ops.to_fileio_unlink = remote_hostio_unlink;
   remote_ops.to_fileio_readlink = remote_hostio_readlink;

gdb/target.c

@@ -2839,6 +2839,25 @@ target_fileio_pread (int fd, gdb_byte *read_buf, int len,
   return ret;
 }
 
+/* See target.h.  */
+int
+target_fileio_fstat (int fd, struct stat *sb, int *target_errno)
+{
+  fileio_fh_t *fh = fileio_fd_to_fh (fd);
+  int ret = -1;
+
+  if (is_closed_fileio_fh (fh->fd))
+    *target_errno = EBADF;
+  else
+    ret = fh->t->to_fileio_fstat (fh->t, fh->fd, sb, target_errno);
+
+  if (targetdebug)
+    fprintf_unfiltered (gdb_stdlog,
+			"target_fileio_fstat (%d) = %d (%d)\n",
+			fd, ret, ret != -1 ? 0 : *target_errno);
+  return ret;
+}
+
 /* Close FD on the target.  Return 0, or -1 if an error occurs
    (and set *TARGET_ERRNO).  */
 int

gdb/target.h

@@ -846,6 +846,12 @@ struct target_ops
 			    int fd, gdb_byte *read_buf, int len,
 			    ULONGEST offset, int *target_errno);
 
+    /* Get information about the file opened as FD and put it in
+       SB.  Return 0 on success, or -1 if an error occurs (and set
+       *TARGET_ERRNO).  */
+    int (*to_fileio_fstat) (struct target_ops *,
+			    int fd, struct stat *sb, int *target_errno);
+
     /* Close FD on the target.  Return 0, or -1 if an error occurs
        (and set *TARGET_ERRNO).  */
     int (*to_fileio_close) (struct target_ops *, int fd, int *target_errno);
@@ -1933,6 +1939,12 @@ extern int target_fileio_pwrite (int fd, const gdb_byte *write_buf, int len,
 extern int target_fileio_pread (int fd, gdb_byte *read_buf, int len,
 				ULONGEST offset, int *target_errno);
 
+/* Get information about the file opened as FD on the target
+   and put it in SB.  Return 0 on success, or -1 if an error
+   occurs (and set *TARGET_ERRNO).  */
+extern int target_fileio_fstat (int fd, struct stat *sb,
+				int *target_errno);
+
 /* Close FD on the target.  Return 0, or -1 if an error occurs
    (and set *TARGET_ERRNO).  */
 extern int target_fileio_close (int fd, int *target_errno);