File: utimensat.m4

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# serial 5
# See if we need to provide utimensat replacement.

dnl Copyright (C) 2009-2015 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.

# Written by Eric Blake.

AC_DEFUN([gl_FUNC_UTIMENSAT],
[
  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  AC_CHECK_FUNCS_ONCE([utimensat])
  if test $ac_cv_func_utimensat = no; then
    HAVE_UTIMENSAT=0
  else
    AC_CACHE_CHECK([whether utimensat works],
      [gl_cv_func_utimensat_works],
      [AC_RUN_IFELSE(
         [AC_LANG_PROGRAM([[
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
]],         [[int result = 0;
              const char *f = "conftest.file";
              if (close (creat (f, 0600)))
                return 1;
              /* Test whether the AT_SYMLINK_NOFOLLOW flag is supported.  */
              {
                if (utimensat (AT_FDCWD, f, NULL, AT_SYMLINK_NOFOLLOW))
                  result |= 2;
              }
              /* Test whether UTIME_NOW and UTIME_OMIT work.  */
              {
                struct timespec ts[2] = { { 1, UTIME_OMIT }, { 1, UTIME_NOW } };
                if (utimensat (AT_FDCWD, f, ts, 0))
                  result |= 4;
              }
              sleep (1);
              {
                struct timespec ts[2] = { { 1, UTIME_NOW }, { 1, UTIME_OMIT } };
                struct stat st;
                if (utimensat (AT_FDCWD, f, ts, 0))
                  result |= 8;
                if (stat (f, &st))
                  result |= 16;
                else if (st.st_ctime < st.st_atime)
                  result |= 32;
              }
              return result;
            ]])],
dnl FIXME: simplify this in 2012, when file system bugs are no longer common
         [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#ifdef __linux__
/* The Linux kernel added utimensat in 2.6.22, but has bugs with UTIME_OMIT
   in several file systems as recently as 2.6.32.  Always replace utimensat
   to support older kernels.  */
choke me
#endif
      ]])],
           [gl_cv_func_utimensat_works=yes],
           [gl_cv_func_utimensat_works="needs runtime check"])],
         [gl_cv_func_utimensat_works=no],
         [gl_cv_func_utimensat_works="guessing no"])])
    if test "$gl_cv_func_utimensat_works" != yes; then
      REPLACE_UTIMENSAT=1
    fi
  fi
])