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/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nixio.h"
#include <poll.h>
#include <time.h>
#include <errno.h>
#include <stdlib.h>
#include "nixio.h"
/**
* nanosleep()
*/
static int nixio_nanosleep(lua_State *L) {
struct timespec req, rem;
req.tv_sec = luaL_optint(L, 1, 0);
req.tv_nsec = luaL_optint(L, 2, 0);
int status = nanosleep(&req, &rem);
if (!status) {
lua_pushboolean(L, 1);
return 1;
} else {
if (errno == EINTR) {
lua_pushboolean(L, 0);
lua_pushinteger(L, rem.tv_sec);
lua_pushinteger(L, rem.tv_nsec);
return 3;
} else {
return nixio__perror(L);
}
}
}
/**
* Checks whether a flag is set in the table and translates it into a bitmap
*/
static void nixio_poll_flags__w(lua_State *L, int *map, int f, const char *t) {
lua_pushstring(L, t);
lua_rawget(L, -2);
if (lua_toboolean(L, -1)) {
*map |= f;
}
lua_pop(L, 1);
}
/**
* Checks whether a flag is set in the bitmap and sets the matching table value
*/
static void nixio_poll_flags__r(lua_State *L, int *map, int f, const char *t) {
lua_pushstring(L, t);
if (*map & f) {
lua_pushboolean(L, 1);
} else {
lua_pushnil(L);
}
lua_rawset(L, -3);
}
/**
* Translate integer to poll flags and vice versa
*/
static int nixio_poll_flags(lua_State *L) {
int flags;
if (lua_istable(L, 1)) {
lua_settop(L, 1);
flags = 0;
nixio_poll_flags__w(L, &flags, POLLIN, "in");
nixio_poll_flags__w(L, &flags, POLLPRI, "pri");
nixio_poll_flags__w(L, &flags, POLLOUT, "out");
nixio_poll_flags__w(L, &flags, POLLERR, "err");
nixio_poll_flags__w(L, &flags, POLLHUP, "hup");
nixio_poll_flags__w(L, &flags, POLLNVAL, "nval");
lua_pushinteger(L, flags);
} else {
flags = luaL_checkinteger(L, 1);
lua_newtable(L);
nixio_poll_flags__r(L, &flags, POLLIN, "in");
nixio_poll_flags__r(L, &flags, POLLPRI, "pri");
nixio_poll_flags__r(L, &flags, POLLOUT, "out");
nixio_poll_flags__r(L, &flags, POLLERR, "err");
nixio_poll_flags__r(L, &flags, POLLHUP, "hup");
nixio_poll_flags__r(L, &flags, POLLNVAL, "nval");
}
return 1;
}
/**
* poll({{fd = socket, events = FLAGS}, ...}, timeout)
*/
static int nixio_poll(lua_State *L) {
int len = lua_objlen(L, 1);
int i, fd;
int timeout = luaL_optint(L, 2, 0);
int status = -1;
/* we are being abused as sleep() replacement... */
if (lua_isnoneornil(L, 1) || len < 1) {
return nixio__pstatus(L, !poll(NULL, 0, timeout));
}
luaL_checktype(L, 1, LUA_TTABLE);
struct pollfd *fds = calloc(len, sizeof(struct pollfd));
for (i = 0; i < len; i++) {
lua_rawgeti(L, 1, i+1);
if (!lua_istable(L, -1)) {
free(fds);
return luaL_argerror(L, 1, "invalid datastructure");
}
lua_pushliteral(L, "fd");
lua_rawget(L, -2);
fd = nixio__tofd(L, -1);
if (fd == -1) {
free(fds);
return luaL_argerror(L, 1, "invalid fd in datastructure");
}
fds[i].fd = fd;
lua_pushliteral(L, "events");
lua_rawget(L, -3);
fds[i].events = (short)lua_tointeger(L, -1);
lua_pop(L, 3);
}
status = poll(fds, (nfds_t)len, timeout);
if (status < 1) {
free(fds);
return nixio__perror(L);
}
for (i = 0; i < len; i++) {
lua_rawgeti(L, 1, i+1);
lua_pushliteral(L, "revents");
lua_pushinteger(L, fds[i].revents);
lua_rawset(L, -3);
lua_pop(L, 1);
}
free(fds);
lua_pushinteger(L, status);
lua_pushvalue(L, 1);
return 2;
}
/* module table */
static const luaL_reg R[] = {
{"nanosleep", nixio_nanosleep},
{"poll", nixio_poll},
{"poll_flags", nixio_poll_flags},
{NULL, NULL}
};
void nixio_open_poll(lua_State *L) {
luaL_register(L, NULL, R);
}
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