summaryrefslogtreecommitdiff
path: root/m4/stat-time.m4
diff options
context:
space:
mode:
authorPaul Eggert <eggert@cs.ucla.edu>2012-06-22 14:26:37 -0700
committerPaul Eggert <eggert@cs.ucla.edu>2012-06-22 14:26:37 -0700
commitc8fff8630133fea7c4e279458d10d825e5028c62 (patch)
treef8b8261fdf3596e1306a3d072e13ec572c9e3e65 /m4/stat-time.m4
parent36cec983d4e680e28e7066fda505910cd549f509 (diff)
downloademacs-c8fff8630133fea7c4e279458d10d825e5028c62.tar.gz
Add gnulib files to support higher-resolution time stamps.
Fixes: debbugs:9000
Diffstat (limited to 'm4/stat-time.m4')
-rw-r--r--m4/stat-time.m485
1 files changed, 85 insertions, 0 deletions
diff --git a/m4/stat-time.m4 b/m4/stat-time.m4
new file mode 100644
index 00000000000..2dbb1f3c752
--- /dev/null
+++ b/m4/stat-time.m4
@@ -0,0 +1,85 @@
+# Checks for stat-related time functions.
+
+# Copyright (C) 1998-1999, 2001, 2003, 2005-2007, 2009-2012 Free Software
+# Foundation, Inc.
+
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+dnl From Paul Eggert.
+
+# st_atim.tv_nsec - Linux, Solaris, Cygwin
+# st_atimespec.tv_nsec - FreeBSD, NetBSD, if ! defined _POSIX_SOURCE
+# st_atimensec - FreeBSD, NetBSD, if defined _POSIX_SOURCE
+# st_atim.st__tim.tv_nsec - UnixWare (at least 2.1.2 through 7.1)
+
+# st_birthtimespec - FreeBSD, NetBSD (hidden on OpenBSD 3.9, anyway)
+# st_birthtim - Cygwin 1.7.0+
+
+AC_DEFUN([gl_STAT_TIME],
+[
+ AC_REQUIRE([AC_C_INLINE])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_HEADERS_ONCE([sys/time.h])
+
+ AC_CHECK_MEMBERS([struct stat.st_atim.tv_nsec],
+ [AC_CACHE_CHECK([whether struct stat.st_atim is of type struct timespec],
+ [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec],
+ [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+ [[
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #if HAVE_SYS_TIME_H
+ # include <sys/time.h>
+ #endif
+ #include <time.h>
+ struct timespec ts;
+ struct stat st;
+ ]],
+ [[
+ st.st_atim = ts;
+ ]])],
+ [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=yes],
+ [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=no])])
+ if test $ac_cv_typeof_struct_stat_st_atim_is_struct_timespec = yes; then
+ AC_DEFINE([TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC], [1],
+ [Define to 1 if the type of the st_atim member of a struct stat is
+ struct timespec.])
+ fi],
+ [AC_CHECK_MEMBERS([struct stat.st_atimespec.tv_nsec], [],
+ [AC_CHECK_MEMBERS([struct stat.st_atimensec], [],
+ [AC_CHECK_MEMBERS([struct stat.st_atim.st__tim.tv_nsec], [], [],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])
+])
+
+# Check for st_birthtime, a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.)
+# and NTFS (Cygwin).
+# There was a time when this field was named st_createtime (21 June
+# 2002 to 16 July 2002) But that window is very small and applied only
+# to development code, so systems still using that configuration are
+# not supported. See revisions 1.10 and 1.11 of FreeBSD's
+# src/sys/ufs/ufs/dinode.h.
+#
+AC_DEFUN([gl_STAT_BIRTHTIME],
+[
+ AC_REQUIRE([AC_C_INLINE])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_HEADERS_ONCE([sys/time.h])
+ AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec], [],
+ [AC_CHECK_MEMBERS([struct stat.st_birthtimensec], [],
+ [AC_CHECK_MEMBERS([struct stat.st_birthtim.tv_nsec], [], [],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])],
+ [#include <sys/types.h>
+ #include <sys/stat.h>])
+])