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/*
* time.c - Builtin functions that provide time-related functions.
*/
/*
* Copyright (C) 2012, 2013, 2014
* the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef __VMS
#define HAVE_NANOSLEEP
#define HAVE_GETTIMEOFDAY
#ifdef gettimeofday
#undef gettimeofday
#endif
#ifdef __ia64__
/* nanosleep not working correctly on IA64 */
static int
vms_fake_nanosleep(struct timespec *rqdly, struct timespec *rmdly)
{
int result;
struct timespec mtime1, mtime2;
result = nanosleep(rqdly, &mtime1);
if (result == 0)
return 0;
/* On IA64 it returns 100 nanoseconds early with an error */
if ((mtime1.tv_sec == 0) && (mtime1.tv_nsec <= 100)) {
mtime1.tv_nsec += 100;
result = nanosleep(&mtime1, &mtime2);
if (result == 0)
return 0;
if ((mtime2.tv_sec == 0) && (mtime2.tv_nsec <= 100)) {
return 0;
}
}
return result;
}
#define nanosleep(x,y) vms_fake_nanosleep(x, y)
#endif
#endif
#include "gawkapi.h"
#include "gettext.h"
#define _(msgid) gettext(msgid)
#define N_(msgid) msgid
static const gawk_api_t *api; /* for convenience macros to work */
static awk_ext_id_t *ext_id;
static const char *ext_version = "time extension: version 1.0";
static awk_bool_t (*init_func)(void) = NULL;
int plugin_is_GPL_compatible;
#include <time.h>
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#endif
#if defined(HAVE_SELECT) && defined(HAVE_SYS_SELECT_H)
#include <sys/select.h>
#endif
#if defined(HAVE_GETSYSTEMTIMEASFILETIME)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#endif
/*
* Returns time since 1/1/1970 UTC as a floating point value; should
* have sub-second precision, but the actual precision will vary based
* on the platform
*/
static awk_value_t *
do_gettimeofday(int nargs, awk_value_t *result, struct awk_ext_func *unused)
{
double curtime;
assert(result != NULL);
#if defined(HAVE_GETTIMEOFDAY)
{
struct timeval tv;
gettimeofday(&tv,NULL);
curtime = tv.tv_sec+(tv.tv_usec/1000000.0);
}
#elif defined(HAVE_GETSYSTEMTIMEASFILETIME)
/* based on perl win32/win32.c:win32_gettimeofday() implementation */
{
union {
unsigned __int64 ft_i64;
FILETIME ft_val;
} ft;
/* # of 100-nanosecond intervals since January 1, 1601 (UTC) */
GetSystemTimeAsFileTime(&ft.ft_val);
#ifdef __GNUC__
#define Const64(x) x##LL
#else
#define Const64(x) x##i64
#endif
/* Number of 100 nanosecond units from 1/1/1601 to 1/1/1970 */
#define EPOCH_BIAS Const64(116444736000000000)
curtime = (ft.ft_i64 - EPOCH_BIAS)/10000000.0;
#undef Const64
}
#else
/* no way to retrieve system time on this platform */
curtime = -1;
update_ERRNO_string(_("gettimeofday: not supported on this platform"));
#endif
return make_number(curtime, result);
}
/*
* Returns 0 if successful in sleeping the requested time;
* returns -1 if there is no platform support, or if the sleep request
* did not complete successfully (perhaps interrupted)
*/
static awk_value_t *
do_sleep(int nargs, awk_value_t *result, struct awk_ext_func *unused)
{
awk_value_t num;
double secs;
int rc;
assert(result != NULL);
if (! get_argument(0, AWK_NUMBER, &num)) {
update_ERRNO_string(_("sleep: missing required numeric argument"));
return make_number(-1, result);
}
secs = num.num_value;
if (secs < 0) {
update_ERRNO_string(_("sleep: argument is negative"));
return make_number(-1, result);
}
#if defined(HAVE_NANOSLEEP)
{
struct timespec req;
req.tv_sec = secs;
req.tv_nsec = (secs-(double)req.tv_sec)*1000000000.0;
if ((rc = nanosleep(&req,NULL)) < 0)
/* probably interrupted */
update_ERRNO_int(errno);
}
#elif defined(HAVE_SELECT)
{
struct timeval timeout;
timeout.tv_sec = secs;
timeout.tv_usec = (secs-(double)timeout.tv_sec)*1000000.0;
if ((rc = select(0,NULL,NULL,NULL,&timeout)) < 0)
/* probably interrupted */
update_ERRNO_int(errno);
}
#elif defined(HAVE_GETSYSTEMTIMEASFILETIME)
{
DWORD milliseconds = secs * 1000;
Sleep (milliseconds);
rc = 0;
}
#else
/* no way to sleep on this platform */
rc = -1;
update_ERRNO_string(_("sleep: not supported on this platform"));
#endif
return make_number(rc, result);
}
static awk_ext_func_t func_table[] = {
{ "gettimeofday", do_gettimeofday, 0, 0, awk_false, NULL },
{ "sleep", do_sleep, 1, 1, awk_false, NULL },
};
/* define the dl_load function using the boilerplate macro */
dl_load_func(func_table, time, "")
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