/*

 * POSIX library for Lua 5.1, 5.2 & 5.3.

 * (c) Gary V. Vaughan <gary@vaughan.pe>, 2013-2015

 * (c) Reuben Thomas <rrt@sc3d.org> 2010-2013

 * (c) Natanael Copa <natanael.copa@gmail.com> 2008-2010

 * Clean up and bug fixes by Leo Razoumov <slonik.az@gmail.com> 2006-10-11

 * Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> 07 Apr 2006 23:17:49

 * Based on original by Claudio Terra for Lua 3.x.

 * With contributions by Roberto Ierusalimschy.

 * With documentation from Steve Donovan 2012

 */

/***

 Process Times.

@module posix.sys.times

*/

#include <config.h>

#include <sys/times.h>

#include "_helpers.c"

#define pushtimefield(k,x) pushintegerfield((k), ((lua_Integer)x)/clk_tck)

/***

Process times record.

All times are measured in cpu seconds.

@table PosixTms

@int tms_utime time spent executing user instructions

@int tms_stime time spent in system execution

@int tms_cutime sum of *tms_utime* for calling process and its children

@int tms_cstime sum of *tms_stime* for calling process and its children

*/

static int

pushtms(lua_State *L)

{

	static long clk_tck = 0;

	struct tms t;

	clock_t elapsed = times(&t);

	if (elapsed == (clock_t) -1)

		return pusherror(L, "times");

	if (clk_tck == 0)

		clk_tck = sysconf(_SC_CLK_TCK);

	lua_createtable(L, 0, 5);

	/* record elapsed time, and save accounting to struct */

	pushtimefield("elapsed", elapsed);

	/* record struct entries */

	pushtimefield("tms_utime", t.tms_utime);

	pushtimefield("tms_stime", t.tms_stime);

	pushtimefield("tms_cutime", t.tms_cutime);

	pushtimefield("tms_cstime", t.tms_cstime);

	settypemetatable("PosixTms");

	return 1;

}

/***

Get the current process times.

@function times

@treturn[1] PosixTms time accounting for this process, if successful

@return[2] nil

@treturn[2] string error message

@treturn[2] int errnum

@see times(2)

*/

static int

Ptimes(lua_State *L)

{

	checknargs(L, 0);

	return pushtms(L);

}

static const luaL_Reg posix_sys_times_fns[] =

{

	LPOSIX_FUNC( Ptimes		),

	{NULL, NULL}

};

LUALIB_API int

luaopen_posix_sys_times(lua_State *L)

{

	luaL_register(L, "posix.sys.times", posix_sys_times_fns);

	lua_pushliteral(L, "posix.sys.times for " LUA_VERSION " / " PACKAGE_STRING);

	lua_setfield(L, -2, "version");

	return 1;

}