2 * nixio - Linux I/O library for lua
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
27 static int nixio_gettimeofday(lua_State *L) {
29 gettimeofday(&tv, NULL);
30 nixio__pushnumber(L, tv.tv_sec);
31 nixio__pushnumber(L, tv.tv_usec);
39 static int nixio_nanosleep(lua_State *L) {
40 struct timespec req, rem;
41 req.tv_sec = luaL_optint(L, 1, 0);
42 req.tv_nsec = luaL_optint(L, 2, 0);
44 int status = nanosleep(&req, &rem);
46 lua_pushboolean(L, 1);
50 lua_pushboolean(L, 0);
51 lua_pushinteger(L, rem.tv_sec);
52 lua_pushinteger(L, rem.tv_nsec);
55 return nixio__perror(L);
61 * Checks whether a flag is set in the bitmap and sets the matching table value
63 static void nixio_poll_flags__r(lua_State *L, int *map, int f, const char *t) {
66 lua_pushboolean(L, 1);
74 * Translate integer to poll flags and vice versa
76 static int nixio_poll_flags(lua_State *L) {
78 if (lua_isnumber(L, 1)) {
79 flags = luaL_checkinteger(L, 1);
81 nixio_poll_flags__r(L, &flags, POLLIN, "in");
82 nixio_poll_flags__r(L, &flags, POLLOUT, "out");
83 nixio_poll_flags__r(L, &flags, POLLERR, "err");
85 nixio_poll_flags__r(L, &flags, POLLPRI, "pri");
86 nixio_poll_flags__r(L, &flags, POLLHUP, "hup");
87 nixio_poll_flags__r(L, &flags, POLLNVAL, "nval");
91 const int j = lua_gettop(L);
92 for (int i=1; i<=j; i++) {
93 const char *flag = luaL_checkstring(L, i);
94 if (!strcmp(flag, "in")) {
96 } else if (!strcmp(flag, "out")) {
98 } else if (!strcmp(flag, "err")) {
100 } else if (!strcmp(flag, "pri")) {
104 } else if (!strcmp(flag, "hup")) {
108 } else if (!strcmp(flag, "nval")) {
113 return luaL_argerror(L, i,
114 "supported values: in, pri, out, err, hup, nval");
117 lua_pushinteger(L, flags);
123 * poll({{fd = socket, events = FLAGS}, ...}, timeout)
125 static int nixio_poll(lua_State *L) {
126 int len = lua_objlen(L, 1);
128 int timeout = luaL_optint(L, 2, 0);
131 /* we are being abused as sleep() replacement... */
132 if (lua_isnoneornil(L, 1) || len < 1) {
133 if (!poll(NULL, 0, timeout)) {
134 lua_pushinteger(L, 0);
137 return nixio__perror(L);
141 luaL_checktype(L, 1, LUA_TTABLE);
142 struct pollfd *fds = calloc(len, sizeof(struct pollfd));
144 return luaL_error(L, NIXIO_OOM);
147 for (i = 0; i < len; i++) {
148 lua_rawgeti(L, 1, i+1);
149 if (!lua_istable(L, -1)) {
151 return luaL_argerror(L, 1, "invalid datastructure");
154 lua_pushliteral(L, "fd");
156 fd = nixio__tofd(L, -1);
159 return luaL_argerror(L, 1, "invalid fd in datastructure");
163 lua_pushliteral(L, "events");
165 fds[i].events = (short)lua_tointeger(L, -1);
170 status = poll(fds, (nfds_t)len, timeout);
174 lua_pushboolean(L, 0);
176 } else if (status < 0) {
178 return nixio__perror(L);
181 for (i = 0; i < len; i++) {
182 lua_rawgeti(L, 1, i+1);
184 lua_pushliteral(L, "revents");
185 lua_pushinteger(L, fds[i].revents);
193 lua_pushinteger(L, status);
200 static const luaL_reg R[] = {
201 {"gettimeofday", nixio_gettimeofday},
202 {"nanosleep", nixio_nanosleep},
203 {"poll", nixio_poll},
204 {"poll_flags", nixio_poll_flags},
208 void nixio_open_poll(lua_State *L) {
209 luaL_register(L, NULL, R);