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timemodule.c
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timemodule.c
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/* Time module */
#include "Python.h"
#include <ctype.h>
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if defined(HAVE_SYS_RESOURCE_H)
#include <sys/resource.h>
#endif
#ifdef QUICKWIN
#include <io.h>
#endif
#if defined(__WATCOMC__) && !defined(__QNX__)
#include <i86.h>
#else
#ifdef MS_WINDOWS
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "pythread.h"
#endif /* MS_WINDOWS */
#endif /* !__WATCOMC__ || __QNX__ */
/* Forward declarations */
static int pysleep(_PyTime_t);
static PyObject* floattime(_Py_clock_info_t *info);
static PyObject *
time_time(PyObject *self, PyObject *unused)
{
return floattime(NULL);
}
PyDoc_STRVAR(time_doc,
"time() -> floating point number\n\
\n\
Return the current time in seconds since the Epoch.\n\
Fractions of a second may be present if the system clock provides them.");
#if defined(HAVE_CLOCK)
#ifndef CLOCKS_PER_SEC
#ifdef CLK_TCK
#define CLOCKS_PER_SEC CLK_TCK
#else
#define CLOCKS_PER_SEC 1000000
#endif
#endif
static PyObject *
floatclock(_Py_clock_info_t *info)
{
clock_t value;
value = clock();
if (value == (clock_t)-1) {
PyErr_SetString(PyExc_RuntimeError,
"the processor time used is not available "
"or its value cannot be represented");
return NULL;
}
if (info) {
info->implementation = "clock()";
info->resolution = 1.0 / (double)CLOCKS_PER_SEC;
info->monotonic = 1;
info->adjustable = 0;
}
return PyFloat_FromDouble((double)value / CLOCKS_PER_SEC);
}
#endif /* HAVE_CLOCK */
#ifdef MS_WINDOWS
#define WIN32_PERF_COUNTER
/* Win32 has better clock replacement; we have our own version, due to Mark
Hammond and Tim Peters */
static PyObject*
win_perf_counter(_Py_clock_info_t *info)
{
static LONGLONG cpu_frequency = 0;
static LONGLONG ctrStart;
LARGE_INTEGER now;
double diff;
if (cpu_frequency == 0) {
LARGE_INTEGER freq;
QueryPerformanceCounter(&now);
ctrStart = now.QuadPart;
if (!QueryPerformanceFrequency(&freq) || freq.QuadPart == 0) {
PyErr_SetFromWindowsErr(0);
return NULL;
}
cpu_frequency = freq.QuadPart;
}
QueryPerformanceCounter(&now);
diff = (double)(now.QuadPart - ctrStart);
if (info) {
info->implementation = "QueryPerformanceCounter()";
info->resolution = 1.0 / (double)cpu_frequency;
info->monotonic = 1;
info->adjustable = 0;
}
return PyFloat_FromDouble(diff / (double)cpu_frequency);
}
#endif /* MS_WINDOWS */
#if defined(WIN32_PERF_COUNTER) || defined(HAVE_CLOCK)
#define PYCLOCK
static PyObject*
pyclock(_Py_clock_info_t *info)
{
#ifdef WIN32_PERF_COUNTER
return win_perf_counter(info);
#else
return floatclock(info);
#endif
}
static PyObject *
time_clock(PyObject *self, PyObject *unused)
{
return pyclock(NULL);
}
PyDoc_STRVAR(clock_doc,
"clock() -> floating point number\n\
\n\
Return the CPU time or real time since the start of the process or since\n\
the first call to clock(). This has as much precision as the system\n\
records.");
#endif
#ifdef HAVE_CLOCK_GETTIME
static PyObject *
time_clock_gettime(PyObject *self, PyObject *args)
{
int ret;
int clk_id;
struct timespec tp;
if (!PyArg_ParseTuple(args, "i:clock_gettime", &clk_id))
return NULL;
ret = clock_gettime((clockid_t)clk_id, &tp);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
return PyFloat_FromDouble(tp.tv_sec + tp.tv_nsec * 1e-9);
}
PyDoc_STRVAR(clock_gettime_doc,
"clock_gettime(clk_id) -> floating point number\n\
\n\
Return the time of the specified clock clk_id.");
#endif /* HAVE_CLOCK_GETTIME */
#ifdef HAVE_CLOCK_SETTIME
static PyObject *
time_clock_settime(PyObject *self, PyObject *args)
{
int clk_id;
PyObject *obj;
_PyTime_t t;
struct timespec tp;
int ret;
if (!PyArg_ParseTuple(args, "iO:clock_settime", &clk_id, &obj))
return NULL;
if (_PyTime_FromSecondsObject(&t, obj, _PyTime_ROUND_FLOOR) < 0)
return NULL;
if (_PyTime_AsTimespec(t, &tp) == -1)
return NULL;
ret = clock_settime((clockid_t)clk_id, &tp);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(clock_settime_doc,
"clock_settime(clk_id, time)\n\
\n\
Set the time of the specified clock clk_id.");
#endif /* HAVE_CLOCK_SETTIME */
#ifdef HAVE_CLOCK_GETRES
static PyObject *
time_clock_getres(PyObject *self, PyObject *args)
{
int ret;
int clk_id;
struct timespec tp;
if (!PyArg_ParseTuple(args, "i:clock_getres", &clk_id))
return NULL;
ret = clock_getres((clockid_t)clk_id, &tp);
if (ret != 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
return PyFloat_FromDouble(tp.tv_sec + tp.tv_nsec * 1e-9);
}
PyDoc_STRVAR(clock_getres_doc,
"clock_getres(clk_id) -> floating point number\n\
\n\
Return the resolution (precision) of the specified clock clk_id.");
#endif /* HAVE_CLOCK_GETRES */
static PyObject *
time_sleep(PyObject *self, PyObject *obj)
{
_PyTime_t secs;
if (_PyTime_FromSecondsObject(&secs, obj, _PyTime_ROUND_CEILING))
return NULL;
if (secs < 0) {
PyErr_SetString(PyExc_ValueError,
"sleep length must be non-negative");
return NULL;
}
if (pysleep(secs) != 0)
return NULL;
Py_RETURN_NONE;
}
PyDoc_STRVAR(sleep_doc,
"sleep(seconds)\n\
\n\
Delay execution for a given number of seconds. The argument may be\n\
a floating point number for subsecond precision.");
static PyStructSequence_Field struct_time_type_fields[] = {
{"tm_year", "year, for example, 1993"},
{"tm_mon", "month of year, range [1, 12]"},
{"tm_mday", "day of month, range [1, 31]"},
{"tm_hour", "hours, range [0, 23]"},
{"tm_min", "minutes, range [0, 59]"},
{"tm_sec", "seconds, range [0, 61])"},
{"tm_wday", "day of week, range [0, 6], Monday is 0"},
{"tm_yday", "day of year, range [1, 366]"},
{"tm_isdst", "1 if summer time is in effect, 0 if not, and -1 if unknown"},
{"tm_zone", "abbreviation of timezone name"},
{"tm_gmtoff", "offset from UTC in seconds"},
{0}
};
static PyStructSequence_Desc struct_time_type_desc = {
"time.struct_time",
"The time value as returned by gmtime(), localtime(), and strptime(), and\n"
" accepted by asctime(), mktime() and strftime(). May be considered as a\n"
" sequence of 9 integers.\n\n"
" Note that several fields' values are not the same as those defined by\n"
" the C language standard for struct tm. For example, the value of the\n"
" field tm_year is the actual year, not year - 1900. See individual\n"
" fields' descriptions for details.",
struct_time_type_fields,
9,
};
static int initialized;
static PyTypeObject StructTimeType;
static PyObject *
tmtotuple(struct tm *p
#ifndef HAVE_STRUCT_TM_TM_ZONE
, const char *zone, int gmtoff
#endif
)
{
PyObject *v = PyStructSequence_New(&StructTimeType);
if (v == NULL)
return NULL;
#define SET(i,val) PyStructSequence_SET_ITEM(v, i, PyLong_FromLong((long) val))
SET(0, p->tm_year + 1900);
SET(1, p->tm_mon + 1); /* Want January == 1 */
SET(2, p->tm_mday);
SET(3, p->tm_hour);
SET(4, p->tm_min);
SET(5, p->tm_sec);
SET(6, (p->tm_wday + 6) % 7); /* Want Monday == 0 */
SET(7, p->tm_yday + 1); /* Want January, 1 == 1 */
SET(8, p->tm_isdst);
#ifdef HAVE_STRUCT_TM_TM_ZONE
PyStructSequence_SET_ITEM(v, 9,
PyUnicode_DecodeLocale(p->tm_zone, "surrogateescape"));
SET(10, p->tm_gmtoff);
#else
PyStructSequence_SET_ITEM(v, 9,
PyUnicode_DecodeLocale(zone, "surrogateescape"));
SET(10, gmtoff);
#endif /* HAVE_STRUCT_TM_TM_ZONE */
#undef SET
if (PyErr_Occurred()) {
Py_XDECREF(v);
return NULL;
}
return v;
}
/* Parse arg tuple that can contain an optional float-or-None value;
format needs to be "|O:name".
Returns non-zero on success (parallels PyArg_ParseTuple).
*/
static int
parse_time_t_args(PyObject *args, const char *format, time_t *pwhen)
{
PyObject *ot = NULL;
time_t whent;
if (!PyArg_ParseTuple(args, format, &ot))
return 0;
if (ot == NULL || ot == Py_None) {
whent = time(NULL);
}
else {
if (_PyTime_ObjectToTime_t(ot, &whent, _PyTime_ROUND_FLOOR) == -1)
return 0;
}
*pwhen = whent;
return 1;
}
static PyObject *
time_gmtime(PyObject *self, PyObject *args)
{
time_t when;
struct tm buf;
if (!parse_time_t_args(args, "|O:gmtime", &when))
return NULL;
errno = 0;
if (_PyTime_gmtime(when, &buf) != 0)
return NULL;
#ifdef HAVE_STRUCT_TM_TM_ZONE
return tmtotuple(&buf);
#else
return tmtotuple(&buf, "UTC", 0);
#endif
}
#ifndef HAVE_TIMEGM
static time_t
timegm(struct tm *p)
{
/* XXX: the following implementation will not work for tm_year < 1970.
but it is likely that platforms that don't have timegm do not support
negative timestamps anyways. */
return p->tm_sec + p->tm_min*60 + p->tm_hour*3600 + p->tm_yday*86400 +
(p->tm_year-70)*31536000 + ((p->tm_year-69)/4)*86400 -
((p->tm_year-1)/100)*86400 + ((p->tm_year+299)/400)*86400;
}
#endif
PyDoc_STRVAR(gmtime_doc,
"gmtime([seconds]) -> (tm_year, tm_mon, tm_mday, tm_hour, tm_min,\n\
tm_sec, tm_wday, tm_yday, tm_isdst)\n\
\n\
Convert seconds since the Epoch to a time tuple expressing UTC (a.k.a.\n\
GMT). When 'seconds' is not passed in, convert the current time instead.\n\
\n\
If the platform supports the tm_gmtoff and tm_zone, they are available as\n\
attributes only.");
static PyObject *
time_localtime(PyObject *self, PyObject *args)
{
time_t when;
struct tm buf;
if (!parse_time_t_args(args, "|O:localtime", &when))
return NULL;
if (_PyTime_localtime(when, &buf) != 0)
return NULL;
#ifdef HAVE_STRUCT_TM_TM_ZONE
return tmtotuple(&buf);
#else
{
struct tm local = buf;
char zone[100];
int gmtoff;
strftime(zone, sizeof(zone), "%Z", &buf);
gmtoff = timegm(&buf) - when;
return tmtotuple(&local, zone, gmtoff);
}
#endif
}
PyDoc_STRVAR(localtime_doc,
"localtime([seconds]) -> (tm_year,tm_mon,tm_mday,tm_hour,tm_min,\n\
tm_sec,tm_wday,tm_yday,tm_isdst)\n\
\n\
Convert seconds since the Epoch to a time tuple expressing local time.\n\
When 'seconds' is not passed in, convert the current time instead.");
/* Convert 9-item tuple to tm structure. Return 1 on success, set
* an exception and return 0 on error.
*/
static int
gettmarg(PyObject *args, struct tm *p)
{
int y;
memset((void *) p, '\0', sizeof(struct tm));
if (!PyTuple_Check(args)) {
PyErr_SetString(PyExc_TypeError,
"Tuple or struct_time argument required");
return 0;
}
if (!PyArg_ParseTuple(args, "iiiiiiiii",
&y, &p->tm_mon, &p->tm_mday,
&p->tm_hour, &p->tm_min, &p->tm_sec,
&p->tm_wday, &p->tm_yday, &p->tm_isdst))
return 0;
p->tm_year = y - 1900;
p->tm_mon--;
p->tm_wday = (p->tm_wday + 1) % 7;
p->tm_yday--;
#ifdef HAVE_STRUCT_TM_TM_ZONE
if (Py_TYPE(args) == &StructTimeType) {
PyObject *item;
item = PyTuple_GET_ITEM(args, 9);
p->tm_zone = item == Py_None ? NULL : PyUnicode_AsUTF8(item);
item = PyTuple_GET_ITEM(args, 10);
p->tm_gmtoff = item == Py_None ? 0 : PyLong_AsLong(item);
if (PyErr_Occurred())
return 0;
}
#endif /* HAVE_STRUCT_TM_TM_ZONE */
return 1;
}
/* Check values of the struct tm fields before it is passed to strftime() and
* asctime(). Return 1 if all values are valid, otherwise set an exception
* and returns 0.
*/
static int
checktm(struct tm* buf)
{
/* Checks added to make sure strftime() and asctime() does not crash Python by
indexing blindly into some array for a textual representation
by some bad index (fixes bug #897625 and #6608).
Also support values of zero from Python code for arguments in which
that is out of range by forcing that value to the lowest value that
is valid (fixed bug #1520914).
Valid ranges based on what is allowed in struct tm:
- tm_year: [0, max(int)] (1)
- tm_mon: [0, 11] (2)
- tm_mday: [1, 31]
- tm_hour: [0, 23]
- tm_min: [0, 59]
- tm_sec: [0, 60]
- tm_wday: [0, 6] (1)
- tm_yday: [0, 365] (2)
- tm_isdst: [-max(int), max(int)]
(1) gettmarg() handles bounds-checking.
(2) Python's acceptable range is one greater than the range in C,
thus need to check against automatic decrement by gettmarg().
*/
if (buf->tm_mon == -1)
buf->tm_mon = 0;
else if (buf->tm_mon < 0 || buf->tm_mon > 11) {
PyErr_SetString(PyExc_ValueError, "month out of range");
return 0;
}
if (buf->tm_mday == 0)
buf->tm_mday = 1;
else if (buf->tm_mday < 0 || buf->tm_mday > 31) {
PyErr_SetString(PyExc_ValueError, "day of month out of range");
return 0;
}
if (buf->tm_hour < 0 || buf->tm_hour > 23) {
PyErr_SetString(PyExc_ValueError, "hour out of range");
return 0;
}
if (buf->tm_min < 0 || buf->tm_min > 59) {
PyErr_SetString(PyExc_ValueError, "minute out of range");
return 0;
}
if (buf->tm_sec < 0 || buf->tm_sec > 61) {
PyErr_SetString(PyExc_ValueError, "seconds out of range");
return 0;
}
/* tm_wday does not need checking of its upper-bound since taking
``% 7`` in gettmarg() automatically restricts the range. */
if (buf->tm_wday < 0) {
PyErr_SetString(PyExc_ValueError, "day of week out of range");
return 0;
}
if (buf->tm_yday == -1)
buf->tm_yday = 0;
else if (buf->tm_yday < 0 || buf->tm_yday > 365) {
PyErr_SetString(PyExc_ValueError, "day of year out of range");
return 0;
}
return 1;
}
#ifdef MS_WINDOWS
/* wcsftime() doesn't format correctly time zones, see issue #10653 */
# undef HAVE_WCSFTIME
#endif
#define STRFTIME_FORMAT_CODES \
"Commonly used format codes:\n\
\n\
%Y Year with century as a decimal number.\n\
%m Month as a decimal number [01,12].\n\
%d Day of the month as a decimal number [01,31].\n\
%H Hour (24-hour clock) as a decimal number [00,23].\n\
%M Minute as a decimal number [00,59].\n\
%S Second as a decimal number [00,61].\n\
%z Time zone offset from UTC.\n\
%a Locale's abbreviated weekday name.\n\
%A Locale's full weekday name.\n\
%b Locale's abbreviated month name.\n\
%B Locale's full month name.\n\
%c Locale's appropriate date and time representation.\n\
%I Hour (12-hour clock) as a decimal number [01,12].\n\
%p Locale's equivalent of either AM or PM.\n\
\n\
Other codes may be available on your platform. See documentation for\n\
the C library strftime function.\n"
#ifdef HAVE_STRFTIME
#ifdef HAVE_WCSFTIME
#define time_char wchar_t
#define format_time wcsftime
#define time_strlen wcslen
#else
#define time_char char
#define format_time strftime
#define time_strlen strlen
#endif
static PyObject *
time_strftime(PyObject *self, PyObject *args)
{
PyObject *tup = NULL;
struct tm buf;
const time_char *fmt;
#ifdef HAVE_WCSFTIME
wchar_t *format;
#else
PyObject *format;
#endif
PyObject *format_arg;
size_t fmtlen, buflen;
time_char *outbuf = NULL;
size_t i;
PyObject *ret = NULL;
memset((void *) &buf, '\0', sizeof(buf));
/* Will always expect a unicode string to be passed as format.
Given that there's no str type anymore in py3k this seems safe.
*/
if (!PyArg_ParseTuple(args, "U|O:strftime", &format_arg, &tup))
return NULL;
if (tup == NULL) {
time_t tt = time(NULL);
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
}
else if (!gettmarg(tup, &buf) || !checktm(&buf))
return NULL;
#if defined(_MSC_VER) || defined(sun) || defined(_AIX)
if (buf.tm_year + 1900 < 1 || 9999 < buf.tm_year + 1900) {
PyErr_SetString(PyExc_ValueError,
"strftime() requires year in [1; 9999]");
return NULL;
}
#endif
/* Normalize tm_isdst just in case someone foolishly implements %Z
based on the assumption that tm_isdst falls within the range of
[-1, 1] */
if (buf.tm_isdst < -1)
buf.tm_isdst = -1;
else if (buf.tm_isdst > 1)
buf.tm_isdst = 1;
#ifdef HAVE_WCSFTIME
format = PyUnicode_AsWideCharString(format_arg, NULL);
if (format == NULL)
return NULL;
fmt = format;
#else
/* Convert the unicode string to an ascii one */
format = PyUnicode_EncodeLocale(format_arg, "surrogateescape");
if (format == NULL)
return NULL;
fmt = PyBytes_AS_STRING(format);
#endif
#if defined(MS_WINDOWS) && !defined(HAVE_WCSFTIME)
/* check that the format string contains only valid directives */
for (outbuf = strchr(fmt, '%');
outbuf != NULL;
outbuf = strchr(outbuf+2, '%'))
{
if (outbuf[1] == '#')
++outbuf; /* not documented by python, */
if (outbuf[1] == '\0')
break;
if ((outbuf[1] == 'y') && buf.tm_year < 0) {
PyErr_SetString(PyExc_ValueError,
"format %y requires year >= 1900 on Windows");
Py_DECREF(format);
return NULL;
}
}
#elif (defined(_AIX) || defined(sun)) && defined(HAVE_WCSFTIME)
for (outbuf = wcschr(fmt, '%');
outbuf != NULL;
outbuf = wcschr(outbuf+2, '%'))
{
if (outbuf[1] == L'\0')
break;
/* Issue #19634: On AIX, wcsftime("y", (1899, 1, 1, 0, 0, 0, 0, 0, 0))
returns "0/" instead of "99" */
if (outbuf[1] == L'y' && buf.tm_year < 0) {
PyErr_SetString(PyExc_ValueError,
"format %y requires year >= 1900 on AIX");
return NULL;
}
}
#endif
fmtlen = time_strlen(fmt);
/* I hate these functions that presume you know how big the output
* will be ahead of time...
*/
for (i = 1024; ; i += i) {
outbuf = (time_char *)PyMem_Malloc(i*sizeof(time_char));
if (outbuf == NULL) {
PyErr_NoMemory();
break;
}
#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
errno = 0;
#endif
_Py_BEGIN_SUPPRESS_IPH
buflen = format_time(outbuf, i, fmt, &buf);
_Py_END_SUPPRESS_IPH
#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
/* VisualStudio .NET 2005 does this properly */
if (buflen == 0 && errno == EINVAL) {
PyErr_SetString(PyExc_ValueError, "Invalid format string");
PyMem_Free(outbuf);
break;
}
#endif
if (buflen > 0 || i >= 256 * fmtlen) {
/* If the buffer is 256 times as long as the format,
it's probably not failing for lack of room!
More likely, the format yields an empty result,
e.g. an empty format, or %Z when the timezone
is unknown. */
#ifdef HAVE_WCSFTIME
ret = PyUnicode_FromWideChar(outbuf, buflen);
#else
ret = PyUnicode_DecodeLocaleAndSize(outbuf, buflen,
"surrogateescape");
#endif
PyMem_Free(outbuf);
break;
}
PyMem_Free(outbuf);
}
#ifdef HAVE_WCSFTIME
PyMem_Free(format);
#else
Py_DECREF(format);
#endif
return ret;
}
#undef time_char
#undef format_time
PyDoc_STRVAR(strftime_doc,
"strftime(format[, tuple]) -> string\n\
\n\
Convert a time tuple to a string according to a format specification.\n\
See the library reference manual for formatting codes. When the time tuple\n\
is not present, current time as returned by localtime() is used.\n\
\n" STRFTIME_FORMAT_CODES);
#endif /* HAVE_STRFTIME */
static PyObject *
time_strptime(PyObject *self, PyObject *args)
{
PyObject *module, *func, *result;
_Py_IDENTIFIER(_strptime_time);
module = PyImport_ImportModuleNoBlock("_strptime");
if (!module)
return NULL;
func = _PyObject_GetAttrId(module, &PyId__strptime_time);
Py_DECREF(module);
if (!func) {
return NULL;
}
result = PyObject_Call(func, args, NULL);
Py_DECREF(func);
return result;
}
PyDoc_STRVAR(strptime_doc,
"strptime(string, format) -> struct_time\n\
\n\
Parse a string to a time tuple according to a format specification.\n\
See the library reference manual for formatting codes (same as\n\
strftime()).\n\
\n" STRFTIME_FORMAT_CODES);
static PyObject *
_asctime(struct tm *timeptr)
{
/* Inspired by Open Group reference implementation available at
* http://pubs.opengroup.org/onlinepubs/009695399/functions/asctime.html */
static const char wday_name[7][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char mon_name[12][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
return PyUnicode_FromFormat(
"%s %s%3d %.2d:%.2d:%.2d %d",
wday_name[timeptr->tm_wday],
mon_name[timeptr->tm_mon],
timeptr->tm_mday, timeptr->tm_hour,
timeptr->tm_min, timeptr->tm_sec,
1900 + timeptr->tm_year);
}
static PyObject *
time_asctime(PyObject *self, PyObject *args)
{
PyObject *tup = NULL;
struct tm buf;
if (!PyArg_UnpackTuple(args, "asctime", 0, 1, &tup))
return NULL;
if (tup == NULL) {
time_t tt = time(NULL);
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
} else if (!gettmarg(tup, &buf) || !checktm(&buf))
return NULL;
return _asctime(&buf);
}
PyDoc_STRVAR(asctime_doc,
"asctime([tuple]) -> string\n\
\n\
Convert a time tuple to a string, e.g. 'Sat Jun 06 16:26:11 1998'.\n\
When the time tuple is not present, current time as returned by localtime()\n\
is used.");
static PyObject *
time_ctime(PyObject *self, PyObject *args)
{
time_t tt;
struct tm buf;
if (!parse_time_t_args(args, "|O:ctime", &tt))
return NULL;
if (_PyTime_localtime(tt, &buf) != 0)
return NULL;
return _asctime(&buf);
}
PyDoc_STRVAR(ctime_doc,
"ctime(seconds) -> string\n\
\n\
Convert a time in seconds since the Epoch to a string in local time.\n\
This is equivalent to asctime(localtime(seconds)). When the time tuple is\n\
not present, current time as returned by localtime() is used.");
#ifdef HAVE_MKTIME
static PyObject *
time_mktime(PyObject *self, PyObject *tup)
{
struct tm buf;
time_t tt;
if (!gettmarg(tup, &buf))
return NULL;
#ifdef _AIX
/* year < 1902 or year > 2037 */
if (buf.tm_year < 2 || buf.tm_year > 137) {
/* Issue #19748: On AIX, mktime() doesn't report overflow error for
* timestamp < -2^31 or timestamp > 2**31-1. */
PyErr_SetString(PyExc_OverflowError,
"mktime argument out of range");
return NULL;
}
#else
buf.tm_wday = -1; /* sentinel; original value ignored */
#endif
tt = mktime(&buf);
/* Return value of -1 does not necessarily mean an error, but tm_wday
* cannot remain set to -1 if mktime succeeded. */
if (tt == (time_t)(-1)
#ifndef _AIX
/* Return value of -1 does not necessarily mean an error, but
* tm_wday cannot remain set to -1 if mktime succeeded. */
&& buf.tm_wday == -1
#else
/* on AIX, tm_wday is always sets, even on error */
#endif
)
{
PyErr_SetString(PyExc_OverflowError,
"mktime argument out of range");
return NULL;
}
return PyFloat_FromDouble((double)tt);
}
PyDoc_STRVAR(mktime_doc,
"mktime(tuple) -> floating point number\n\
\n\
Convert a time tuple in local time to seconds since the Epoch.\n\
Note that mktime(gmtime(0)) will not generally return zero for most\n\
time zones; instead the returned value will either be equal to that\n\
of the timezone or altzone attributes on the time module.");
#endif /* HAVE_MKTIME */
#ifdef HAVE_WORKING_TZSET
static void PyInit_timezone(PyObject *module);
static PyObject *
time_tzset(PyObject *self, PyObject *unused)
{
PyObject* m;
m = PyImport_ImportModuleNoBlock("time");
if (m == NULL) {
return NULL;
}
tzset();
/* Reset timezone, altzone, daylight and tzname */
PyInit_timezone(m);
Py_DECREF(m);
if (PyErr_Occurred())
return NULL;
Py_RETURN_NONE;
}
PyDoc_STRVAR(tzset_doc,
"tzset()\n\
\n\
Initialize, or reinitialize, the local timezone to the value stored in\n\
os.environ['TZ']. The TZ environment variable should be specified in\n\
standard Unix timezone format as documented in the tzset man page\n\
(eg. 'US/Eastern', 'Europe/Amsterdam'). Unknown timezones will silently\n\
fall back to UTC. If the TZ environment variable is not set, the local\n\
timezone is set to the systems best guess of wallclock time.\n\
Changing the TZ environment variable without calling tzset *may* change\n\
the local timezone used by methods such as localtime, but this behaviour\n\
should not be relied on.");
#endif /* HAVE_WORKING_TZSET */
static PyObject *
pymonotonic(_Py_clock_info_t *info)
{
_PyTime_t t;
double d;
if (_PyTime_GetMonotonicClockWithInfo(&t, info) < 0) {
assert(info != NULL);
return NULL;
}
d = _PyTime_AsSecondsDouble(t);
return PyFloat_FromDouble(d);
}
static PyObject *
time_monotonic(PyObject *self, PyObject *unused)
{
return pymonotonic(NULL);
}
PyDoc_STRVAR(monotonic_doc,
"monotonic() -> float\n\
\n\
Monotonic clock, cannot go backward.");
static PyObject*
perf_counter(_Py_clock_info_t *info)
{
#ifdef WIN32_PERF_COUNTER
return win_perf_counter(info);
#else
return pymonotonic(info);
#endif
}
static PyObject *
time_perf_counter(PyObject *self, PyObject *unused)
{
return perf_counter(NULL);
}
PyDoc_STRVAR(perf_counter_doc,
"perf_counter() -> float\n\
\n\
Performance counter for benchmarking.");
static PyObject*
py_process_time(_Py_clock_info_t *info)
{
#if defined(MS_WINDOWS)
HANDLE process;
FILETIME creation_time, exit_time, kernel_time, user_time;
ULARGE_INTEGER large;
double total;
BOOL ok;
process = GetCurrentProcess();
ok = GetProcessTimes(process, &creation_time, &exit_time, &kernel_time, &user_time);
if (!ok)
return PyErr_SetFromWindowsErr(0);
large.u.LowPart = kernel_time.dwLowDateTime;
large.u.HighPart = kernel_time.dwHighDateTime;
total = (double)large.QuadPart;
large.u.LowPart = user_time.dwLowDateTime;
large.u.HighPart = user_time.dwHighDateTime;
total += (double)large.QuadPart;
if (info) {
info->implementation = "GetProcessTimes()";
info->resolution = 1e-7;
info->monotonic = 1;
info->adjustable = 0;
}
return PyFloat_FromDouble(total * 1e-7);
#else
#if defined(HAVE_SYS_RESOURCE_H)
struct rusage ru;
#endif
#ifdef HAVE_TIMES
struct tms t;
static long ticks_per_second = -1;
#endif
#if defined(HAVE_CLOCK_GETTIME) \
&& (defined(CLOCK_PROCESS_CPUTIME_ID) || defined(CLOCK_PROF))
struct timespec tp;
#ifdef CLOCK_PROF
const clockid_t clk_id = CLOCK_PROF;
const char *function = "clock_gettime(CLOCK_PROF)";
#else
const clockid_t clk_id = CLOCK_PROCESS_CPUTIME_ID;
const char *function = "clock_gettime(CLOCK_PROCESS_CPUTIME_ID)";
#endif
if (clock_gettime(clk_id, &tp) == 0) {
if (info) {
struct timespec res;
info->implementation = function;
info->monotonic = 1;
info->adjustable = 0;
if (clock_getres(clk_id, &res) == 0)
info->resolution = res.tv_sec + res.tv_nsec * 1e-9;
else