1999-06-23 Roland McGrath <roland@baalperazim.frob.com>

	* sysdeps/mach/hurd/read.c (__libc_read): Just call __pread with
	OFFSET argument of (off_t) -1.
	* sysdeps/mach/hurd/write.c (__libc_write): Just call __pwrite with
	OFFSET argument of (off_t) -1.

	* sysdeps/mach/hurd/pwrite.c: New file.
	* sysdeps/mach/hurd/pread.c: New file.

	* hurd/fd-read.c (_hurd_fd_read): Take new parameter OFFSET and
	pass it in the RPC instead of always -1.
	* hurd/fd-write.c (_hurd_fd_write): Likewise.
	* hurd/hurd/fd.h: Update decls.

6 files changed, 92 insertions, 10 deletions

diff --git a/ChangeLog b/ChangeLog
index 9cb7b61..ac2bfae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,18 @@
+1999-06-23  Roland McGrath  <roland@baalperazim.frob.com>
+
+	* sysdeps/mach/hurd/read.c (__libc_read): Just call __pread with
+	OFFSET argument of (off_t) -1.
+	* sysdeps/mach/hurd/write.c (__libc_write): Just call __pwrite with
+	OFFSET argument of (off_t) -1.
+
+	* sysdeps/mach/hurd/pwrite.c: New file.
+	* sysdeps/mach/hurd/pread.c: New file.
+
+	* hurd/fd-read.c (_hurd_fd_read): Take new parameter OFFSET and
+	pass it in the RPC instead of always -1.
+	* hurd/fd-write.c (_hurd_fd_write): Likewise.
+	* hurd/hurd/fd.h: Update decls.
+
 1999-06-22  Andreas Jaeger  <aj@arthur.rhein-neckar.de>
 
 	* libio/wscanf.c: Include <wchar.h> for prototype.
diff --git a/hurd/fd-read.c b/hurd/fd-read.c
index 8bfc03a..d78cf5c 100644
--- a/hurd/fd-read.c
+++ b/hurd/fd-read.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1993,94,95,97,99 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -23,7 +23,7 @@
 #include <string.h>
 
 error_t
-_hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes)
+_hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes, off_t offset)
 {
   error_t err;
   char *data;
@@ -31,7 +31,7 @@ _hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes)
 
   error_t readfd (io_t port)
     {
-      return __io_read (port, &data, &nread, -1, *nbytes);
+      return __io_read (port, &data, &nread, offset, *nbytes);
     }
 
   data = buf;
diff --git a/hurd/fd-write.c b/hurd/fd-write.c
index 288ce6b..0af5829 100644
--- a/hurd/fd-write.c
+++ b/hurd/fd-write.c
@@ -1,5 +1,5 @@
 /* _hurd_fd_write -- write to a file descriptor; handles job control et al.
-   Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1993,94,95,97,99 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -23,14 +23,15 @@
 #include <hurd/fd.h>
 
 error_t
-_hurd_fd_write (struct hurd_fd *fd, const void *buf, size_t *nbytes)
+_hurd_fd_write (struct hurd_fd *fd,
+		const void *buf, size_t *nbytes, off_t offset)
 {
   error_t err;
   mach_msg_type_number_t wrote;
 
   error_t writefd (io_t port)
     {
-      return __io_write (port, buf, *nbytes, -1, &wrote);
+      return __io_write (port, buf, *nbytes, offset, &wrote);
     }
 
   err = HURD_FD_PORT_USE (fd, _hurd_ctty_output (port, ctty, writefd));
diff --git a/hurd/hurd/fd.h b/hurd/hurd/fd.h
index aa48f21..7e5a978 100644
--- a/hurd/hurd/fd.h
+++ b/hurd/hurd/fd.h
@@ -1,5 +1,5 @@
 /* File descriptors.
-   Copyright (C) 1993,94,95,96,97,98 Free Software Foundation, Inc.
+   Copyright (C) 1993,94,95,96,97,98, 99 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -208,12 +208,14 @@ extern struct hurd_fd *_hurd_new_fd (io_t port, io_t ctty);
 
 extern error_t _hurd_fd_close (struct hurd_fd *fd);
 
-/* Read and write data from a file descriptor; just like `read' and `write'.
+/* Read and write data from a file descriptor; just like `read' and `write'
+   if OFFSET is -1, or like `pread' and `pwrite' if OFFSET is not -1.
    If successful, stores the amount actually read or written in *NBYTES.  */
 
-extern error_t _hurd_fd_read (struct hurd_fd *fd, void *buf, size_t *nbytes);
+extern error_t _hurd_fd_read (struct hurd_fd *fd,
+			      void *buf, size_t *nbytes, off_t offset);
 extern error_t _hurd_fd_write (struct hurd_fd *fd,
-			       const void *buf, size_t *nbytes);
+			       const void *buf, size_t *nbytes, off_t offset);
 
 
 /* Call *RPC on PORT and/or CTTY; if a call on CTTY returns EBACKGROUND,
diff --git a/sysdeps/mach/hurd/pread.c b/sysdeps/mach/hurd/pread.c
new file mode 100644
index 0000000..6deb969
--- /dev/null
+++ b/sysdeps/mach/hurd/pread.c
@@ -0,0 +1,31 @@
+/* Read block from given position in file without changing file pointer.
+   Hurd version.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <unistd.h>
+
+ssize_t
+__pread (int fd, void *buf, size_t nbyte, off_t offset)
+{
+  error_t err = HURD_FD_USE (fd, _hurd_fd_read (descriptor,
+						buf, &nbytes, offset));
+  return err ? __hurd_dfail (fd, err) : nbytes;
+}
+weak_alias (__pread, pread)
diff --git a/sysdeps/mach/hurd/pwrite.c b/sysdeps/mach/hurd/pwrite.c
new file mode 100644
index 0000000..405c152
--- /dev/null
+++ b/sysdeps/mach/hurd/pwrite.c
@@ -0,0 +1,33 @@
+/* Write block at given position in file without changing file pointer.
+   Hurd version.
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <unistd.h>
+
+/* Write NBYTES of BUF to FD at given position OFFSET without changing
+   the file position.  Return the number written, or -1.  */
+ssize_t
+__pwrite (int fd, const void *buf, size_t nbytes, off_t offset)
+{
+  error_t err = HURD_FD_USE (fd, _hurd_fd_write (descriptor,
+						 buf, &nbytes, offset));
+  return err ? __hurd_dfail (fd, err) : nbytes;
+}
+weak_alias (__pwrite, pwrite)