I think the Hurd libc implementation of tmpfile is at fault.
POSIX.1 says there must be a file descriptor. Try this libc patch.
Index: tmpfile.c
===================================================================
RCS file: /cvs/glibc/libc/sysdeps/mach/hurd/tmpfile.c,v
retrieving revision 1.1
diff -u -b -p -r1.1 tmpfile.c
--- tmpfile.c 13 Nov 2001 10:07:11 -0000 1.1
+++ tmpfile.c 17 Apr 2002 18:09:29 -0000
@@ -1,5 +1,5 @@
/* Open a stdio stream on an anonymous temporary file. Hurd version.
- Copyright (C) 2001 Free Software Foundation, Inc.
+ Copyright (C) 2001,02 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
@@ -20,6 +20,7 @@
#include <stdio.h>
#include <hurd.h>
#include <hurd/fs.h>
+#include <hurd/fd.h>
#include <fcntl.h>
#ifdef USE_IN_LIBIO
@@ -37,6 +38,7 @@ tmpfile (void)
{
error_t err;
file_t file;
+ int fd;
FILE *f;
/* Get a port to the directory that will contain the file. */
@@ -51,10 +53,15 @@ tmpfile (void)
if (err)
return __hurd_fail (err), NULL;
- /* Open a stream on the port to the unnamed file.
+ /* Get a file descriptor for that port. POSIX.1 requires that streams
+ returned by tmpfile allocate file descriptors as fopen would. */
+ if (_hurd_intern_fd (file, O_RDWR, &fd, 1) < 0) /* dealloc on error */
+ return -1;
+
+ /* Open a stream on the unnamed file.
It will cease to exist when this stream is closed. */
- if ((f = __fopenport (file, "w+b")) == NULL)
- __mach_port_deallocate (__mach_task_self (), file);
+ if ((f = __fdopen (fd, "w+b")) == NULL)
+ __close (fd);
return f;
}
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