Patch #606592: Subsecond timestamps in stat_result.

Doc/lib/libos.tex

@@ -859,6 +859,9 @@ order
 More items may be added at the end by some implementations.  Note that
 on the Mac OS, the time values are floating point values, like all
 time values on the Mac OS.
+\versionchanged
+[On other systems, the values are floats if the system reports
+ fractions of a second]{2.3}
 The standard module \refmodule{stat}\refstmodindex{stat} defines
 functions and constants that are useful for extracting information
 from a \ctype{stat} structure.

Misc/NEWS

@@ -274,6 +274,9 @@ Core and builtins
 
 Extension modules
 
+- The time stamps in os.stat_result are floating point numbers now if
+  the system supports that.
+
 - If the size passed to mmap.mmap() is larger than the length of the
   file on non-Windows platforms, a ValueError is raised. [SF bug 585792]
 

Modules/posixmodule.c

@@ -612,11 +612,28 @@ static PyStructSequence_Desc statvfs_result_desc = {
 static PyTypeObject StatResultType;
 static PyTypeObject StatVFSResultType;
 
+static void
+fill_time(PyObject *v, int index, time_t sec, unsigned long nsec)
+{
+	PyObject *val;
+	if (nsec) {
+		val = PyFloat_FromDouble(sec + 1e-9*nsec);
+	} else {
+#if SIZEOF_TIME_T > SIZEOF_LONG
+		val = PyLong_FromLongLong((LONG_LONG)sec);
+#else
+		val = PyInt_FromLong((long)sec);
+#endif
+	}
+	PyStructSequence_SET_ITEM(v, index, val);
+}
+
 /* pack a system stat C structure into the Python stat tuple
    (used by posix_stat() and posix_fstat()) */
 static PyObject*
 _pystat_fromstructstat(STRUCT_STAT st)
 {
+	unsigned long ansec, mnsec, cnsec;
 	PyObject *v = PyStructSequence_New(&StatResultType);
 	if (v == NULL)
 		return NULL;
@@ -643,18 +660,17 @@ _pystat_fromstructstat(STRUCT_STAT st)
 #else
         PyStructSequence_SET_ITEM(v, 6, PyInt_FromLong(st.st_size));
 #endif
-#if SIZEOF_TIME_T > SIZEOF_LONG
-        PyStructSequence_SET_ITEM(v, 7,
-				  PyLong_FromLongLong((LONG_LONG)st.st_atime));
-        PyStructSequence_SET_ITEM(v, 8,
-				  PyLong_FromLongLong((LONG_LONG)st.st_mtime));
-        PyStructSequence_SET_ITEM(v, 9,
-				  PyLong_FromLongLong((LONG_LONG)st.st_ctime));
+
+#ifdef HAVE_STAT_TV_NSEC
+	ansec = st.st_atim.tv_nsec;
+	mnsec = st.st_mtim.tv_nsec;
+	cnsec = st.st_ctim.tv_nsec;
 #else
-	PyStructSequence_SET_ITEM(v, 7, PyInt_FromLong((long)st.st_atime));
-        PyStructSequence_SET_ITEM(v, 8, PyInt_FromLong((long)st.st_mtime));
-        PyStructSequence_SET_ITEM(v, 9, PyInt_FromLong((long)st.st_ctime));
+	ansec = mnsec = cnsec = 0;
 #endif
+	fill_time(v, 7, st.st_atime, ansec);
+	fill_time(v, 8, st.st_mtime, mnsec);
+	fill_time(v, 9, st.st_ctime, cnsec);
 
 #ifdef HAVE_ST_BLKSIZE
 	PyStructSequence_SET_ITEM(v, ST_BLKSIZE_IDX,

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 1.339 .
+# From configure.in Revision: 1.341 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53.
 #
@@ -15699,6 +15699,65 @@ _ACEOF
 
 fi
 
+# Look for subsecond timestamps in struct stat
+echo "$as_me:$LINENO: checking for tv_nsec in struct stat" >&5
+echo $ECHO_N "checking for tv_nsec in struct stat... $ECHO_C" >&6
+if test "${ac_cv_stat_tv_nsec+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+#line $LINENO "configure"
+#include "confdefs.h"
+#include <sys/stat.h>
+#ifdef F77_DUMMY_MAIN
+#  ifdef __cplusplus
+     extern "C"
+#  endif
+   int F77_DUMMY_MAIN() { return 1; }
+#endif
+int
+main ()
+{
+
+struct stat st;
+st.st_mtim.tv_nsec = 1;
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+         { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_cv_stat_tv_nsec = yes
+else
+  echo "$as_me: failed program was:" >&5
+cat conftest.$ac_ext >&5
+ac_cv_stat_tv_nsec=no
+fi
+rm -f conftest.$ac_objext conftest.$ac_ext
+fi
+
+echo "$as_me:$LINENO: result: $ac_cv_stat_tv_nsec" >&5
+echo "${ECHO_T}$ac_cv_stat_tv_nsec" >&6
+if test "$ac_cv_stat_tv_nsec" = yes
+then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_STAT_TV_NSEC 1
+_ACEOF
+
+fi
+
 # On HP/UX 11.0, mvwdelch is a block with a return statement
 echo "$as_me:$LINENO: checking whether mvwdelch is an expression" >&5
 echo $ECHO_N "checking whether mvwdelch is an expression... $ECHO_C" >&6

configure.in

@@ -2240,6 +2240,23 @@ then
   [Define if nice() returns success/failure instead of the new priority.])
 fi
 
+# Look for subsecond timestamps in struct stat
+AC_MSG_CHECKING(for tv_nsec in struct stat)
+AC_CACHE_VAL(ac_cv_stat_tv_nsec,
+AC_TRY_COMPILE([#include <sys/stat.h>], [
+struct stat st;
+st.st_mtim.tv_nsec = 1;
+],
+ac_cv_stat_tv_nsec = yes,
+ac_cv_stat_tv_nsec=no,
+ac_cv_stat_tv_nsec=no))
+AC_MSG_RESULT($ac_cv_stat_tv_nsec)
+if test "$ac_cv_stat_tv_nsec" = yes
+then
+  AC_DEFINE(HAVE_STAT_TV_NSEC, 1,
+  [Define if you have struct stat.st_mtim.tv_nsec])
+fi
+
 # On HP/UX 11.0, mvwdelch is a block with a return statement
 AC_MSG_CHECKING(whether mvwdelch is an expression)
 AC_CACHE_VAL(ac_cv_mvwdelch_is_expression,

pyconfig.h.in

@@ -388,6 +388,9 @@
 /* Define to 1 if you have the `statvfs' function. */
 #undef HAVE_STATVFS
 
+/* Define if you have struct stat.st_mtim.tv_nsec */
+#undef HAVE_STAT_TV_NSEC
+
 /* Define to 1 if you have the <stdarg.h> header file. */
 #undef HAVE_STDARG_H