Update.

2 files changed, 70 insertions, 0 deletions

diff --git a/lgl/lseek.c b/lgl/lseek.c
new file mode 100644
index 0000000000..be9cd81c6d
--- /dev/null
+++ b/lgl/lseek.c
@@ -0,0 +1,40 @@
+/* An lseek() function that detects pipes.
+   Copyright (C) 2007 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as published by
+   the Free Software Foundation; either version 2.1, or (at your option)
+   any later version.
+
+   This program 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License along
+   with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <unistd.h>
+
+/* Get GetFileType.  The replacement lseek is only used on mingw, so
+   this include can be unconditional.  */
+#include <windows.h>
+#include <errno.h>
+
+#undef lseek
+
+off_t
+rpl_lseek (int fd, off_t offset, int whence)
+{
+  /* mingw lseek mistakenly succeeds on pipes, sockets, and terminals.  */
+  if (GetFileType ((HANDLE) _get_osfhandle (fd)) != FILE_TYPE_DISK)
+    {
+      errno = ESPIPE;
+      return -1;
+    }
+  return lseek (fd, offset, whence);
+}
diff --git a/lgl/m4/lseek.m4 b/lgl/m4/lseek.m4
new file mode 100644
index 0000000000..075c2f42c2
--- /dev/null
+++ b/lgl/m4/lseek.m4
@@ -0,0 +1,30 @@
+# lseek.m4 serial 1
+dnl Copyright (C) 2007 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_LSEEK],
+[
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_PROG_CC])
+  AC_CACHE_CHECK([whether lseek detects pipes], [gl_cv_func_lseek_pipe],
+    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <unistd.h>],
+[#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* mingw mistakenly returns 0 when trying to seek on pipes.  */
+  Choke me.
+#endif])],
+      [gl_cv_func_lseek_pipe=yes], [gl_cv_func_lseek_pipe=no])])
+  if test $gl_cv_func_lseek_pipe = no; then
+    gl_REPLACE_LSEEK
+  fi
+])
+
+AC_DEFUN([gl_REPLACE_LSEEK],
+[
+  AC_LIBOBJ([lseek])
+  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  REPLACE_LSEEK=1
+  AC_DEFINE([LSEEK_PIPE_BROKEN], [1],
+	    [Define to 1 if lseek does not detect pipes.])
+])