/* An lseek() function that detects pipes.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
GNU General Public License for more details.
You should have received a copy of the GNU 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. */
+ with this program; if not, see <http://www.gnu.org/licenses/>. */
#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>
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+/* Windows platforms. */
+/* Get GetFileType. */
+# include <windows.h>
+/* Get _get_osfhandle. */
+# include "msvc-nothrow.h"
+#else
+# include <sys/stat.h>
+#endif
#include <errno.h>
#undef lseek
off_t
rpl_lseek (int fd, off_t offset, int whence)
{
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
/* mingw lseek mistakenly succeeds on pipes, sockets, and terminals. */
- if (GetFileType ((HANDLE) _get_osfhandle (fd)) != FILE_TYPE_DISK)
+ HANDLE h = (HANDLE) _get_osfhandle (fd);
+ if (h == INVALID_HANDLE_VALUE)
+ {
+ errno = EBADF;
+ return -1;
+ }
+ if (GetFileType (h) != FILE_TYPE_DISK)
+ {
+ errno = ESPIPE;
+ return -1;
+ }
+#else
+ /* BeOS lseek mistakenly succeeds on pipes... */
+ struct stat statbuf;
+ if (fstat (fd, &statbuf) < 0)
+ return -1;
+ if (!S_ISREG (statbuf.st_mode))
{
errno = ESPIPE;
return -1;
}
+#endif
return lseek (fd, offset, whence);
}