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Add os_utils lua binding to get access to gettimeofday() and getPID().
Also small changes to deal with c/c++ errors/warnings.
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * This file is part of the Doodle3D project (http://doodle3d.com). | ||
| * | ||
| * Copyright (c) 2013-2014, Doodle3D | ||
| * This software is licensed under the terms of the GNU GPL v2 or later. | ||
| * See file LICENSE.txt or visit http://www.gnu.org/licenses/gpl.html for full license details. | ||
| */ | ||
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| #define LUA_LIB | ||
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| #include <unistd.h> | ||
| #include <sys/time.h> | ||
| #include "lua_compat.h" | ||
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| /********************* | ||
| * UTILITY FUNCTIONS * | ||
| * ******************* | ||
| * | ||
| * For microsecond-precision time and obtaining PID. | ||
| * Note: this should really be in the firmware repository but that would require | ||
| * a C(++) dependency on that package as well as duplicating lua_compat.h. | ||
| */ | ||
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| /* | ||
| * --- Get the current time with high precision. | ||
| * -- The returned values are as returned by the C function `gettimeofday()`, | ||
| * -- so it is in local time since epoch (1-1-1970). | ||
| * -- | ||
| * -- @return Seconds since epoch. | ||
| * -- @return Microseconds since epoch. | ||
| * -- @name getTime | ||
| */ | ||
| static int l_getTime(lua_State *L) { | ||
| struct timeval now; | ||
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| gettimeofday(&now, NULL); | ||
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| lua_pushinteger(L, now.tv_sec); | ||
| lua_pushinteger(L, now.tv_usec); | ||
| return 2; | ||
| } | ||
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| /* | ||
| * --- Get both the time elapsed since the given time in milliseconds. | ||
| * -- Additionally, the current time is returned in the same fashion as getTime, | ||
| * -- in order to allow for easy repeated measuring of elapsed time. | ||
| * -- If less than two arguments are passed, nil+msg is returned. | ||
| * -- | ||
| * -- @see getTime | ||
| * -- @param sec Seconds since epoch to measure elapsed time from. | ||
| * -- @param usec Microseconds since epoch to measure elapsed time from. | ||
| * -- @return The number of milliseconds elapsed since the given time. | ||
| * -- @return Current seconds since epoch. | ||
| * -- @return Current microseconds since epoch. | ||
| * -- @name getElapsedTime | ||
| */ | ||
| static int l_getElapsedTime(lua_State *L) { | ||
| struct timeval begin, now; | ||
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| if (lua_gettop(L) >= 2) { | ||
| begin.tv_sec = luaL_checkinteger(L, 1); | ||
| begin.tv_usec = luaL_checkinteger(L, 2); | ||
| } else { | ||
| lua_pushnil(L); | ||
| lua_pushstring(L, "two arguments required: seconds and microseconds"); | ||
| return 2; | ||
| } | ||
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| gettimeofday(&now, NULL); | ||
| //usec must be cast to int because if it has rolled over, the subtraction can be negative | ||
| int msec_diff = (now.tv_sec - begin.tv_sec) * 1000 + ((int)now.tv_usec - (int)begin.tv_usec) / 1000; | ||
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| lua_pushinteger(L, msec_diff); | ||
| lua_pushinteger(L, now.tv_sec); | ||
| lua_pushinteger(L, now.tv_usec); | ||
| return 3; | ||
| } | ||
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| /* | ||
| * --- Return the process ID of the current process. | ||
| * -- | ||
| * -- @return The PID as returned by the C function `getPID()`. | ||
| * -- @name getPID | ||
| */ | ||
| static int l_getPID(lua_State *L) { | ||
| lua_pushinteger(L, getpid()); | ||
| return 1; | ||
| } | ||
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| /************************** | ||
| * REGISTRATION FUNCTIONS * | ||
| **************************/ | ||
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| static const struct luaL_Reg os_utils_f[] = { | ||
| {"getTime", l_getTime}, | ||
| {"getElapsedTime", l_getElapsedTime}, | ||
| {"getPID", l_getPID}, | ||
| {NULL, NULL} | ||
| }; | ||
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| int luaopen_os_utils(lua_State *L) { | ||
| luaL_newlib(L, os_utils_f); | ||
| return 1; | ||
| } |