-# serial 1
+# serial 6
# See if we need to provide futimens replacement.
-dnl Copyright (C) 2009 Free Software Foundation, Inc.
+dnl Copyright (C) 2009-2013 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_CHECK_FUNCS_ONCE([futimens])
if test $ac_cv_func_futimens = no; then
HAVE_FUTIMENS=0
- AC_LIBOBJ([futimens])
else
AC_CACHE_CHECK([whether futimens works],
[gl_cv_func_futimens_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <fcntl.h>
#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+]], [[struct timespec ts[2] = { { 1, UTIME_OMIT }, { 1, UTIME_NOW } };
+ int fd = creat ("conftest.file", 0600);
+ struct stat st;
+ if (fd < 0) return 1;
+ errno = 0;
+ if (futimens (AT_FDCWD, NULL) == 0) return 2;
+ if (errno != EBADF) return 3;
+ if (futimens (fd, ts)) return 4;
+ sleep (1);
+ ts[0].tv_nsec = UTIME_NOW;
+ ts[1].tv_nsec = UTIME_OMIT;
+ if (futimens (fd, ts)) return 5;
+ if (fstat (fd, &st)) return 6;
+ if (st.st_ctime < st.st_atime) return 7;
+ ]])],
+dnl FIXME: simplify this in 2012, when file system bugs are no longer common
+ [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifdef __linux__
-/* The Linux kernel added futimens in 2.6.22, but it had bugs until 2.6.26.
- Always replace futimens to support older kernels. */
+/* The Linux kernel added futimens in 2.6.22, but has bugs with UTIME_OMIT
+ in several file systems as recently as 2.6.32. Always replace futimens
+ to support older kernels. */
choke me
#endif
-]], [[struct timespec ts[2] = { { 1, UTIME_OMIT }, { 1, UTIME_OMIT } };
- if (futimens (AT_FDCWD, NULL)) return 1;
- return futimens (open (".", O_RDONLY), ts);]])],
- [gl_cv_func_futimens_works=yes],
- [gl_cv_func_futimens_works="needs runtime check"],
- [gl_cv_func_futimens_works="guessing no"])])
+ ]])],
+ [gl_cv_func_futimens_works=yes],
+ [gl_cv_func_futimens_works="needs runtime check"])],
+ [gl_cv_func_futimens_works=no],
+ [gl_cv_func_futimens_works="guessing no"])
+ rm -f conftest.file])
if test "$gl_cv_func_futimens_works" != yes; then
REPLACE_FUTIMENS=1
- AC_LIBOBJ([futimens])
fi
fi
])