[PATCH 1/9] Introduce target_fileio_fstat

[Gary Benson <gbenson@redhat.com>]

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   |    9 +++++++++
 gdb/inf-child.c |   17 +++++++++++++++++
 gdb/remote.c    |    1 +
 gdb/target.c    |   21 +++++++++++++++++++++
 gdb/target.h    |   11 +++++++++++
 5 files changed, 59 insertions(+), 0 deletions(-)

diff --git a/gdb/inf-child.c b/gdb/inf-child.c
index 494f4b8..a0b786c 100644
--- a/gdb/inf-child.c
+++ b/gdb/inf-child.c
@@ -374,6 +374,22 @@ inf_child_fileio_pread (struct target_ops *self,
   return ret;
 }
 
+/* Get information about the file opened as FD and put it in SB.
+   Return 0, or -1 if an error occurs (and set *TARGET_ERRNO).  */
+
+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 +516,7 @@ 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;
diff --git a/gdb/remote.c b/gdb/remote.c
index dfa68b3..9c6d2e5 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -11844,6 +11844,7 @@ 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;
diff --git a/gdb/target.c b/gdb/target.c
index bb901b5..44ede10 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -2848,6 +2848,27 @@ target_fileio_pread (int fd, gdb_byte *read_buf, int len,
   return ret;
 }
 
+/* Get information about the file opened as FD on the target
+   and put it in SB.  Return 0, or -1 if an error occurs (and
+   set *TARGET_ERRNO).  */
+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
diff --git a/gdb/target.h b/gdb/target.h
index c95e1a4..d2bd152 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -846,6 +846,11 @@ 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, 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 +1938,12 @@ 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, 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);
-- 
1.7.1