Support for gettime and sleep functions

Provide `gettime` and `sleep` functions with at least 1 millisecond
resolution.

14 files changed, 600 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..65b45dd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+**/.*.swp
+**/.*.swo
+*.o
+*.obj
+*.dll
+*.so
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..efc632b
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,23 @@
+language: c
+
+env:
+  - LUA='Lua 5.1'
+  - LUA='Lua 5.2'
+  - LUA='Lua 5.3'
+  - LUA='LuaJIT 2.0'
+
+before_install:
+  - bash .travis_setup.sh
+
+install:
+  - sudo luarocks install busted
+  - sudo luarocks make
+
+script: busted spec
+
+branches:
+  only:
+    - master
+
+notifications:
+  email: false
diff --git a/.travis_setup.sh b/.travis_setup.sh
new file mode 100644
index 0000000..f186230
--- /dev/null
+++ b/.travis_setup.sh
@@ -0,0 +1,45 @@
+# A script for setting up environment for travis-ci testing.
+# Sets up Lua and Luarocks.
+# LUA must be "Lua 5.1", "Lua 5.2", "Lua 5.3" or "LuaJIT 2.0".
+
+set -e
+
+echo 'rocks_servers = {
+  "http://luarocks.org/manifests/olivine-labs",
+  "http://rocks.moonscript.org/",
+  "http://luarocks.org/repositories/rocks",
+  "http://luarocks.logiceditor.com/rocks",
+  "http://liblua.so/luarocks/repositories/rocks"
+}' >> ~/config.lua
+
+
+if [ "$LUA" == "LuaJIT 2.0" ]; then
+  wget -O - http://luajit.org/download/LuaJIT-2.0.4.tar.gz | tar xz
+  cd LuaJIT-2.0.4
+  make && sudo make install INSTALL_TSYMNAME=lua;
+else
+  if [ "$LUA" == "Lua 5.1" ]; then
+    wget -O - http://www.lua.org/ftp/lua-5.1.5.tar.gz | tar xz
+    cd lua-5.1.5;
+  elif [ "$LUA" == "Lua 5.2" ]; then
+    wget -O - http://www.lua.org/ftp/lua-5.2.4.tar.gz | tar xz
+    cd lua-5.2.4;
+  elif [ "$LUA" == "Lua 5.3" ]; then
+    wget -O - http://www.lua.org/ftp/lua-5.3.2.tar.gz | tar xz
+    cd lua-5.3.2;
+  fi
+  sudo make linux install;
+fi
+
+cd ..
+wget -O - http://luarocks.org/releases/luarocks-2.3.0.tar.gz | tar xz || wget -O - http://keplerproject.github.io/luarocks/releases/luarocks-2.3.0.tar.gz | tar xz
+cd luarocks-2.3.0
+
+if [ "$LUA" == "LuaJIT 2.0" ]; then
+  ./configure --with-lua-include=/usr/local/include/luajit-2.0;
+else
+  ./configure;
+fi
+
+make build && sudo make install
+cd ..
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..0421a4a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+MIT License Terms
+=================
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of 
+this software and associated documentation files (the "Software"), to deal in 
+the Software without restriction, including without limitation the rights to 
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
+of the Software, and to permit persons to whom the Software is furnished to do 
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all 
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
+SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..4d83c2a
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,32 @@
+# busted_time makefile
+#
+# see csrc/makefile for description of how to customize the build
+#
+# Targets:
+#   install            install system independent support
+#   install-all        install for lua51 lua52 lua53
+#   print              print the build settings
+
+PLAT?= linux
+PLATS= macosx linux win32 mingw freebsd
+
+all: $(PLAT)
+
+$(PLATS) none install local clean:
+        $(MAKE) -C src $@
+
+print:
+        $(MAKE) -C src $@
+
+install-all:
+        $(MAKE) clean
+        @cd src && $(MAKE) $(PLAT) LUA_VERSION=5.1
+        @cd src && $(MAKE) install LUA_VERSION=5.1
+        $(MAKE) clean
+        @cd src && $(MAKE) $(PLAT) LUA_VERSION=5.2
+        @cd src && $(MAKE) install LUA_VERSION=5.2
+        $(MAKE) clean
+        @cd src && $(MAKE) $(PLAT) LUA_VERSION=5.3
+        @cd src && $(MAKE) install LUA_VERSION=5.3
+
+.PHONY: test
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..240c478
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+LuaSystem
+======
+
+[![travis-ci status](https://travis-ci.org/o-lim/luasystem.svg?branch=master)](https://travis-ci.org/o-lim/luasystem/builds)
+
+
+luasystem is a platform independent system call library for Lua.
+Supports Lua >= 5.1 and luajit >= 2.0.0.
+
+Currently the following functions are supported:
+* gettime
+* sleep
+
+License
+-------
+
+This code and its accompanying README are
+[MIT licensed](http://www.opensource.org/licenses/mit-license.php).
+See LICENSE for details.
diff --git a/luasystem-scm-0.rockspec b/luasystem-scm-0.rockspec
new file mode 100644
index 0000000..83f4172
--- /dev/null
+++ b/luasystem-scm-0.rockspec
@@ -0,0 +1,47 @@
+package = 'luasystem'
+version = 'scm-0'
+source = {
+  url = "git://github.com/o-lim/luasystem",
+  branch = "master"
+}
+description = {
+  summary = 'Platform independent system calls for Lua.',
+  detailed = [[
+    Adds a Lua API for making platform independent system calls.
+  ]],
+  homepage = 'http://olivinelabs.com/luasystem/',
+  license = 'MIT <http://opensource.org/licenses/MIT>'
+}
+dependencies = {
+  'lua >= 5.1',
+}
+
+local function make_platform(plat)
+  local defines = {
+    unix = { },
+    macosx = { },
+    win32 = { },
+    mingw32 = { "WINVER=0x0501" },
+  }
+  return {
+    modules = {
+      ['system.core'] = {
+        sources = { 'src/core.c', 'src/compat.c', 'src/time.c', },
+        defines = defines[plat],
+      },
+    },
+  }
+end
+
+build = {
+  type = 'builtin',
+  platforms = {
+    unix = make_platform('unix'),
+    macosx = make_platform('macosx'),
+    win32 = make_platform('win32'),
+    mingw32 = make_platform('mingw32'),
+  },
+  modules = {
+    ['system.init'] = 'system/init.lua',
+  },
+}
diff --git a/spec/time_spec.lua b/spec/time_spec.lua
new file mode 100644
index 0000000..8bee5f7
--- /dev/null
+++ b/spec/time_spec.lua
@@ -0,0 +1,13 @@
+local system = require 'system.core'
+
+describe('Test time functions', function()
+  it('gettime returns current time', function()
+    assert.is_near(os.time(), system.gettime(), 1.0)
+  end)
+
+  it('sleep will wait for specified amount of time', function()
+    local starttime = system.gettime()
+    system.sleep(0.5)
+    assert.is_near(0.5, system.gettime() - starttime, 0.1)
+  end)
+end)
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..25f468d
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,257 @@
+# luasystem
+#
+# Definitions in this section can be overriden on the command line or in the
+# environment.
+#
+
+# PLAT: linux macosx win32 mingw
+# platform to build for
+PLAT?=linux
+
+# LUA_VERSION: 5.1 5.2 5.3
+# lua version to build against
+LUA_VERSION?=5.1
+
+# MYCFLAGS: to be set by user if needed
+MYCFLAGS=
+
+# MYLDFLAGS: to be set by user if needed
+MYLDFLAGS=
+
+# where lua headers are found for macosx builds
+# LUAINC_macosx:
+# /opt/local/include
+LUAINC_macosx_base?=/opt/local/include
+LUAINC_macosx?=$(LUAINC_macosx_base)/lua/$(LUA_VERSION)
+# FIXME default should this default to fink or to macports?
+# What happens when more than one Lua version is installed?
+LUAPREFIX_macosx?=/opt/local
+CDIR_macosx?=lib/lua/$(LUA_VERSION)
+LDIR_macosx?=share/lua/$(LUA_VERSION)
+
+# LUAINC_linux:
+# /usr/include/lua$(LUA_VERSION)
+# /usr/local/include
+# /usr/local/include/lua$(LUA_VERSION)
+# where lua headers are found for linux builds
+LUAINC_linux_base?=/usr/include
+LUAINC_linux?=$(LUAINC_linux_base)/lua/$(LUA_VERSION)
+LUAPREFIX_linux?=/usr/local
+CDIR_linux?=lib/lua/$(LUA_VERSION)
+LDIR_linux?=share/lua/$(LUA_VERSION)
+
+# LUAINC_freebsd:
+# /usr/local/include/lua$(LUA_VERSION)
+# where lua headers are found for linux builds
+LUAINC_freebsd_base?=/usr/local/include/
+LUAINC_freebsd?=$(LUAINC_freebsd_base)/lua$(LUA_VERSION)
+LUAPREFIX_freebsd?=/usr/local/
+CDIR_freebsd?=lib/lua/$(LUA_VERSION)
+LDIR_freebsd?=share/lua/$(LUA_VERSION)
+
+# where lua headers are found for mingw builds
+# LUAINC_mingw:
+# /opt/local/include
+LUAINC_mingw_base?=/usr/include
+LUAINC_mingw?=$(LUAINC_mingw_base)/lua/$(LUA_VERSION)
+LUALIB_mingw_base?=/usr/bin
+LUALIB_mingw?=$(LUALIB_mingw_base)/lua/$(LUA_VERSION)/lua$(subst .,,$(LUA_VERSION)).dll
+LUAPREFIX_mingw?=/usr
+CDIR_mingw?=lua/$(LUA_VERSION)
+LDIR_mingw?=lua/$(LUA_VERSION)/lua
+
+
+# LUAINC_win32:
+# LUALIB_win32:
+# where lua headers and libraries are found for win32 builds
+LUAPREFIX_win32?=
+LUAINC_win32?=$(LUAPREFIX_win32)/include/lua/$(LUA_VERSION)
+PLATFORM_win32?=Release
+CDIR_win32?=bin/lua/$(LUA_VERSION)/$(PLATFORM_win32)
+LDIR_win32?=bin/lua/$(LUA_VERSION)/$(PLATFORM_win32)/lua
+LUALIB_win32?=$(LUAPREFIX_win32)/lib/lua/$(LUA_VERSION)/$(PLATFORM_win32)
+LUALIBNAME_win32?=lua$(subst .,,$(LUA_VERSION)).lib 
+
+
+# prefix: /usr/local /usr /opt/local /sw
+# the top of the default install tree
+prefix?=$(LUAPREFIX_$(PLAT))
+
+CDIR?=$(CDIR_$(PLAT))
+LDIR?=$(LDIR_$(PLAT))
+
+# DESTDIR: (no default)
+# used by package managers to install into a temporary destination
+DESTDIR=
+
+#------
+# Definitions below can be overridden on the make command line, but
+# shouldn't have to be.
+
+
+#------
+# Install directories
+#
+
+INSTALL_DIR=install -d
+INSTALL_DATA=install -m644
+INSTALL_EXEC=install
+INSTALL_TOP=$(DESTDIR)$(prefix)
+
+INSTALL_TOP_LDIR=$(INSTALL_TOP)/$(LDIR)
+INSTALL_TOP_CDIR=$(INSTALL_TOP)/$(CDIR)
+
+INSTALL_LDIR=$(INSTALL_TOP_LDIR)/system
+INSTALL_CDIR=$(INSTALL_TOP_CDIR)/system
+
+#------
+# Supported platforms
+#
+PLATS= macosx linux win32 mingw
+
+#------
+# Compiler and linker settings
+# for Mac OS X
+SO_macosx=so
+O_macosx=o
+CC_macosx=gcc
+DEF_macosx=
+CFLAGS_macosx= -I$(LUAINC) $(DEF) -Wall -O2 -fno-common \
+        -fvisibility=hidden
+LDFLAGS_macosx= -bundle -undefined dynamic_lookup -o
+LD_macosx= export MACOSX_DEPLOYMENT_TARGET="10.3"; gcc
+
+#------
+# Compiler and linker settings
+# for Linux
+SO_linux=so
+O_linux=o
+CC_linux=gcc
+DEF_linux=
+CFLAGS_linux= -I$(LUAINC) $(DEF) -Wall -Wshadow -Wextra \
+        -Wimplicit -O2 -ggdb3 -fpic -fvisibility=hidden
+LDFLAGS_linux=-O -shared -fpic -o
+LD_linux=gcc
+
+#------
+# Compiler and linker settings
+# for FreeBSD
+SO_freebsd=so
+O_freebsd=o
+CC_freebsd=gcc
+DEF_freebsd=
+CFLAGS_freebsd= -I$(LUAINC) $(DEF) -Wall -Wshadow -Wextra \
+        -Wimplicit -O2 -ggdb3 -fpic -fvisibility=hidden
+LDFLAGS_freebsd=-O -shared -fpic -o
+LD_freebsd=gcc
+
+#------
+# Compiler and linker settings
+# for MingW
+SO_mingw=dll
+O_mingw=o
+CC_mingw=gcc
+DEF_mingw=-DWINVER=0x0501
+CFLAGS_mingw= -I$(LUAINC) $(DEF) -Wall -O2 -fno-common \
+        -fvisibility=hidden
+LDFLAGS_mingw= $(LUALIB) -shared -Wl,-s -o
+LD_mingw=gcc
+
+
+#------
+# Compiler and linker settings
+# for Win32
+SO_win32=dll
+O_win32=obj
+CC_win32=cl
+DEF_win32= //D "WIN32" //D "NDEBUG" //D "_WINDOWS" //D "_USRDLL" \
+     //D "_CRT_SECURE_NO_WARNINGS" //D "_WINDLL"
+CFLAGS_win32=//I "$(LUAINC)" $(DEF) //O2 //Ot //MD //W3 //nologo
+LDFLAGS_win32= //nologo //link //NOLOGO //DLL //INCREMENTAL:NO \
+    //MANIFEST //MANIFESTFILE:"intermediate.manifest" \
+    //MANIFESTUAC:"level='asInvoker' uiAccess='false'" \
+        //SUBSYSTEM:WINDOWS //OPT:REF //OPT:ICF //DYNAMICBASE:NO \
+    //MACHINE:X86 /LIBPATH:"$(shell cmd //c echo $(LUALIB))" \
+        $(LUALIBNAME_win32) //OUT:
+LD_win32=cl
+
+.SUFFIXES: .obj
+
+.c.obj:
+        $(CC) $(CFLAGS) //Fo"$@" //c $<
+
+#------
+# Output file names
+#
+SO=$(SO_$(PLAT))
+O=$(O_$(PLAT))
+SOLIB=core.$(SO)
+
+#------
+# Settings selected for platform
+#
+CC=$(CC_$(PLAT))
+DEF=$(DEF_$(PLAT))
+CFLAGS=$(MYCFLAGS) $(CFLAGS_$(PLAT))
+LDFLAGS=$(MYLDFLAGS) $(LDFLAGS_$(PLAT))
+LD=$(LD_$(PLAT))
+LUAINC= $(LUAINC_$(PLAT))
+LUALIB= $(LUALIB_$(PLAT))
+
+#------
+# Objects
+#
+OBJS=core.$(O) compat.$(O) time.$(O)
+
+#------
+# Targets
+#
+default: $(PLAT)
+
+freebsd:
+        $(MAKE) all PLAT=freebsd
+
+macosx:
+        $(MAKE) all PLAT=macosx
+
+win32:
+        $(MAKE) all PLAT=win32
+
+linux:
+        $(MAKE) all PLAT=linux
+
+mingw:
+        $(MAKE) all PLAT=mingw
+
+none:
+        @echo "Please run"
+        @echo "   make PLATFORM"
+        @echo "where PLATFORM is one of these:"
+        @echo "   $(PLATS)"
+
+all: $(SOLIB)
+
+$(SOLIB): $(OBJS)
+        $(LD) $(OBJS) $(LDFLAGS)$@
+
+install: all
+        $(INSTALL_DIR) $(INSTALL_TOP_LDIR)
+        $(INSTALL_DIR) $(INSTALL_CDIR)
+        $(INSTALL_EXEC) $(SOLIB) $(INSTALL_CDIR)/$(SOLIB)
+
+local:
+        $(MAKE) install INSTALL_TOP_CDIR=.. INSTALL_TOP_LDIR=..
+
+clean:
+        rm -f $(SOLIB) $(OBJS) ../system/core.so
+
+print:
+        @echo PLAT=$(PLAT)
+        @echo LUA_VERSION=$(LUA_VERSION)
+        @echo prefix=$(prefix)
+        @echo LUAINC_$(PLAT)=$(LUAINC_$(PLAT))
+        @echo LUALIB_$(PLAT)=$(LUALIB_$(PLAT))
+        @echo INSTALL_TOP_CDIR=$(INSTALL_TOP_CDIR)
+        @echo INSTALL_TOP_LDIR=$(INSTALL_TOP_LDIR)
+
+.PHONY: all $(PLATS) default clean none
diff --git a/src/compat.c b/src/compat.c
new file mode 100644
index 0000000..d763c56
--- /dev/null
+++ b/src/compat.c
@@ -0,0 +1,17 @@
+#include <lua.h>
+#include <lauxlib.h>
+
+#if LUA_VERSION_NUM == 501
+void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup) {
+  luaL_checkstack(L, nup+1, "too many upvalues");
+  for (; l->name != NULL; l++) {  /* fill the table with given functions */
+    int i;
+    lua_pushstring(L, l->name);
+    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
+      lua_pushvalue(L, -(nup+1));
+    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
+    lua_settable(L, -(nup + 3));
+  }
+  lua_pop(L, nup);  /* remove upvalues */
+}
+#endif
diff --git a/src/compat.h b/src/compat.h
new file mode 100644
index 0000000..f523fd9
--- /dev/null
+++ b/src/compat.h
@@ -0,0 +1,11 @@
+#ifndef COMPAT_H
+#define COMPAT_H
+
+#include <lua.h>
+#include <lauxlib.h>
+
+#if LUA_VERSION_NUM == 501
+void luaL_setfuncs(lua_State *L, const luaL_Reg *l, int nup);
+#endif
+
+#endif
diff --git a/src/core.c b/src/core.c
new file mode 100644
index 0000000..d2acb95
--- /dev/null
+++ b/src/core.c
@@ -0,0 +1,19 @@
+#include <lua.h>
+#include <lauxlib.h>
+
+#ifdef _WIN32
+#define LUAEXPORT __declspec(dllexport)
+#else
+#define LUAEXPORT __attribute__((visibility("default")))
+#endif
+
+void time_open(lua_State *L);
+
+/*-------------------------------------------------------------------------
+ * Initializes all library modules.
+ *-------------------------------------------------------------------------*/
+LUAEXPORT int luaopen_system_core(lua_State *L) {
+    lua_newtable(L);
+    time_open(L);
+    return 1;
+}
diff --git a/src/time.c b/src/time.c
new file mode 100644
index 0000000..3f61001
--- /dev/null
+++ b/src/time.c
@@ -0,0 +1,89 @@
+#include <lua.h>
+#include <lauxlib.h>
+
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <time.h>
+#include <sys/time.h>
+#endif
+
+#include "compat.h"
+
+/*-------------------------------------------------------------------------
+ * Gets time in s, relative to January 1, 1970 (UTC)
+ * Returns
+ *   time in s.
+ *-------------------------------------------------------------------------*/
+#ifdef _WIN32
+static double time_gettime(void) {
+    FILETIME ft;
+    double t;
+    GetSystemTimeAsFileTime(&ft);
+    /* Windows file time (time since January 1, 1601 (UTC)) */
+    t  = ft.dwLowDateTime/1.0e7 + ft.dwHighDateTime*(4294967296.0/1.0e7);
+    /* convert to Unix Epoch time (time since January 1, 1970 (UTC)) */
+    return (t - 11644473600.0);
+}
+#else
+static double time_gettime(void) {
+    struct timeval v;
+    gettimeofday(&v, (struct timezone *) NULL);
+    /* Unix Epoch time (time since January 1, 1970 (UTC)) */
+    return v.tv_sec + v.tv_usec/1.0e6;
+}
+#endif
+
+/*-------------------------------------------------------------------------
+ * Returns the time the system has been up, in secconds.
+ *-------------------------------------------------------------------------*/
+static int time_lua_gettime(lua_State *L)
+{
+    lua_pushnumber(L, time_gettime());
+    return 1;
+}
+
+/*-------------------------------------------------------------------------
+ * Sleep for n seconds.
+ *-------------------------------------------------------------------------*/
+#ifdef _WIN32
+static int time_lua_sleep(lua_State *L)
+{
+    double n = luaL_checknumber(L, 1);
+    if (n < 0.0) n = 0.0;
+    if (n < DBL_MAX/1000.0) n *= 1000.0;
+    if (n > INT_MAX) n = INT_MAX;
+    Sleep((int)n);
+    return 0;
+}
+#else
+static int time_lua_sleep(lua_State *L)
+{
+    double n = luaL_checknumber(L, 1);
+    struct timespec t, r;
+    if (n < 0.0) n = 0.0;
+    if (n > INT_MAX) n = INT_MAX;
+    t.tv_sec = (int) n;
+    n -= t.tv_sec;
+    t.tv_nsec = (int) (n * 1000000000);
+    if (t.tv_nsec >= 1000000000) t.tv_nsec = 999999999;
+    while (nanosleep(&t, &r) != 0) {
+        t.tv_sec = r.tv_sec;
+        t.tv_nsec = r.tv_nsec;
+    }
+    return 0;
+}
+#endif
+
+static luaL_Reg func[] = {
+    { "gettime", time_lua_gettime },
+    { "sleep", time_lua_sleep },
+    { NULL, NULL }
+};
+
+/*-------------------------------------------------------------------------
+ * Initializes module
+ *-------------------------------------------------------------------------*/
+void time_open(lua_State *L) {
+    luaL_setfuncs(L, func, 0);
+}
diff --git a/system/init.lua b/system/init.lua
new file mode 100644
index 0000000..77e0c3b
--- /dev/null
+++ b/system/init.lua
@@ -0,0 +1,2 @@
+local system = require 'system.core'
+return system