On GNU/Hurd I see the following:
FAIL: test-fdutimensat
======================
test-utimens.h:80: assertion 'func (BASE "file", ts) == -1' failed
FAIL test-fdutimensat (exit status: 134)
FAIL: test-futimens
===================
test-futimens.h:106: assertion 'func (fd, ts) == -1' failed
FAIL test-futimens (exit status: 134)
This is similar to the utimensat issue [1]. Adding a similar configure
check for out-of-range tv_nsec values for futimens fixes both tests.
While there, I adjusted the configure check to return a bit mask instead
of exiting early.
Also reported the bug and mentioned it in the docs [2]. Looking at the
code, NetBSD has a similar situation so I documented that too [3].
Collin
[1] https://lists.gnu.org/archive/html/bug-gnulib/2025-03/msg00058.html
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=32803
[3] https://lists.gnu.org/archive/html/bug-gnulib/2024-09/msg00120.html
>From 23a3940f61f46e84067c4b472920e1c7d34459c2 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.fu...@gmail.com>
Date: Tue, 18 Mar 2025 21:50:00 -0700
Subject: [PATCH] futimens: Work around a GNU/Hurd bug.
* m4/futimens.m4 (gl_FUNC_FUTIMENS): Check if futimens validates the
tv_nsec values of the timespec argument. Set bits in a return value
instead of exiting early.
* doc/posix-functions/futimens.texi (futimens): Mention the GNU/Hurd
bug. Mention the same bug occurs on NetBSD 10.
---
ChangeLog | 7 ++++++
doc/posix-functions/futimens.texi | 5 ++++
m4/futimens.m4 | 39 ++++++++++++++++++++++++-------
3 files changed, 43 insertions(+), 8 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index a0a8763da1..eb51b0f33a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
2025-03-18 Collin Funk <collin.fu...@gmail.com>
+ futimens: Work around a GNU/Hurd bug.
+ * m4/futimens.m4 (gl_FUNC_FUTIMENS): Check if futimens validates the
+ tv_nsec values of the timespec argument. Set bits in a return value
+ instead of exiting early.
+ * doc/posix-functions/futimens.texi (futimens): Mention the GNU/Hurd
+ bug. Mention the same bug occurs on NetBSD 10.
+
mountlist: Add tests.
* modules/mountlist-tests: New file.
* tests/test-mountlist.c: New file.
diff --git a/doc/posix-functions/futimens.texi b/doc/posix-functions/futimens.texi
index 74c3301433..61520789c1 100644
--- a/doc/posix-functions/futimens.texi
+++ b/doc/posix-functions/futimens.texi
@@ -31,6 +31,11 @@ @node futimens
Passing @code{AT_FDCWD} as the fd argument does not properly fail with
@code{EBADF} on some systems:
glibc 2.11, musl libc, Solaris 11.
+@item
+Out-of-range values of @code{tv_nsec} do not lead to a failure on some
+platforms:
+@c https://sourceware.org/bugzilla/show_bug.cgi?id=32803
+NetBSD 10.0, GNU/Hurd.
@end itemize
Portability problems not fixed by Gnulib:
diff --git a/m4/futimens.m4 b/m4/futimens.m4
index fe89fdffa1..7252dd66d1 100644
--- a/m4/futimens.m4
+++ b/m4/futimens.m4
@@ -1,5 +1,5 @@
# futimens.m4
-# serial 11
+# serial 12
dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -32,22 +32,45 @@ AC_DEFUN([gl_FUNC_FUTIMENS]
]GL_MDA_DEFINES],
[[struct timespec ts[2];
int fd = creat ("conftest.file", 0600);
+ int result = 0;
struct stat st;
- if (fd < 0) return 1;
+ if (fd < 0)
+ return 1;
ts[0].tv_sec = 1;
ts[0].tv_nsec = UTIME_OMIT;
ts[1].tv_sec = 1;
ts[1].tv_nsec = UTIME_NOW;
errno = 0;
- if (futimens (AT_FDCWD, NULL) == 0) return 2;
- if (errno != EBADF) return 3;
- if (futimens (fd, ts)) return 4;
+ if (futimens (AT_FDCWD, NULL) == 0 || errno != EBADF)
+ result |= 2;
+ if (futimens (fd, ts))
+ result |= 4;
sleep (1);
ts[0].tv_nsec = UTIME_NOW;
ts[1].tv_nsec = UTIME_OMIT;
- if (futimens (fd, ts)) return 5;
- if (fstat (fd, &st)) return 6;
- if (st.st_ctime < st.st_atime) return 7;
+ if (futimens (fd, ts))
+ result |= 8;
+ if (fstat (fd, &st))
+ result |= 16;
+ if (st.st_ctime < st.st_atime)
+ result |= 32;
+ enum
+ {
+ BILLION = 1000 * 1000 * 1000,
+ /* Bogus positive and negative tv_nsec values closest to valid
+ range, but without colliding with UTIME_NOW or UTIME_OMIT. */
+ UTIME_BOGUS_POS = BILLION + ((UTIME_NOW == BILLION || UTIME_OMIT == BILLION)
+ ? (1 + (UTIME_NOW == BILLION + 1)
+ + (UTIME_OMIT == BILLION + 1))
+ : 0)
+ };
+ ts[0].tv_sec = 1;
+ ts[0].tv_nsec = UTIME_BOGUS_POS;
+ ts[1].tv_sec = 1;
+ ts[1].tv_nsec = 0;
+ if (futimens (fd, ts) == 0)
+ result |= 64;
+ return result;
]])],
[gl_cv_func_futimens_works=yes],
[gl_cv_func_futimens_works=no],
--
2.48.1
