--- /dev/null
+/*
+ * 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 <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+
+
+/**
+ * send() / sendto() helper
+ */
+static int nixio_sock__sendto(lua_State *L, int to) {
+ nixio_sock *sock = nixio__checksock(L);
+ struct sockaddr_storage addr_in;
+#ifndef __WINNT__
+ struct sockaddr_un addr_un;
+#endif
+ struct sockaddr *addr = NULL;
+ socklen_t alen = 0;
+ int argoff = 2;
+
+ if (to) {
+ argoff += 2;
+ if (sock->domain == AF_INET || sock->domain == AF_INET6) {
+ const char *address = luaL_checkstring(L, 3);
+ addr = (struct sockaddr*)&addr_in;
+ alen = sizeof(addr_in);
+
+ nixio_addr naddr;
+ memset(&naddr, 0, sizeof(naddr));
+ strncpy(naddr.host, address, sizeof(naddr.host) - 1);
+ naddr.port = (uint16_t)luaL_checkinteger(L, 4);
+ naddr.family = sock->domain;
+
+ if (nixio__addr_write(&naddr, addr)) {
+ return nixio__perror_s(L);
+ }
+ }
+
+#ifndef __WINNT__
+ else if (sock->domain == AF_UNIX) {
+ size_t pathlen;
+ const char *path = luaL_checklstring(L, 3, &pathlen);
+
+ addr_un.sun_family = AF_UNIX;
+ luaL_argcheck(L, pathlen <= sizeof(addr_un.sun_path), 3, "out of range");
+ memcpy(addr_un.sun_path, path, pathlen);
+
+ addr = (struct sockaddr*)&addr_un;
+ alen = sizeof(sa_family_t) + pathlen;
+ }
+#endif
+ }
+
+ size_t len;
+ ssize_t sent;
+ const char *data = luaL_checklstring(L, 2, &len);
+
+ if (lua_gettop(L) > argoff) {
+ int offset = luaL_optint(L, argoff + 1, 0);
+ if (offset) {
+ if (offset < len) {
+ data += offset;
+ len -= offset;
+ } else {
+ len = 0;
+ }
+ }
+
+ unsigned int wlen = luaL_optint(L, argoff + 2, len);
+ if (wlen < len) {
+ len = wlen;
+ }
+ }
+
+ do {
+ sent = sendto(sock->fd, data, len, 0, addr, alen);
+ } while(sent == -1 && errno == EINTR);
+ if (sent >= 0) {
+ lua_pushinteger(L, sent);
+ return 1;
+ } else {
+ return nixio__perror_s(L);
+ }
+}
+
+/**
+ * send(data)
+ */
+static int nixio_sock_send(lua_State *L) {
+ return nixio_sock__sendto(L, 0);
+}
+
+/**
+ * sendto(data, address, port)
+ */
+static int nixio_sock_sendto(lua_State *L) {
+ return nixio_sock__sendto(L, 1);
+}
+
+
+/**
+ * recv() / recvfrom() helper
+ */
+static int nixio_sock__recvfrom(lua_State *L, int from) {
+ nixio_sock *sock = nixio__checksock(L);
+ char buffer[NIXIO_BUFFERSIZE];
+ struct sockaddr_storage addr_in;
+#ifndef __WINNT__
+ struct sockaddr_un addr_un;
+#endif
+ struct sockaddr *addr = NULL;
+ socklen_t alen = 0;
+ uint req = luaL_checkinteger(L, 2);
+ int readc;
+
+ if (sock->domain == AF_INET || sock->domain == AF_INET6) {
+ addr = (from) ? (struct sockaddr*)&addr_in : NULL;
+ alen = (from) ? sizeof(addr_in) : 0;
+ }
+#ifndef __WINNT__
+ else if (sock->domain == AF_UNIX) {
+ addr = (from) ? (struct sockaddr*)&addr_un : NULL;
+ alen = (from) ? sizeof(addr_un) : 0;
+ }
+#endif
+
+ /* We limit the readsize to NIXIO_BUFFERSIZE */
+ req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
+
+ do {
+ readc = recvfrom(sock->fd, buffer, req, 0, addr, &alen);
+ } while (readc == -1 && errno == EINTR);
+
+#ifdef __WINNT__
+ if (readc < 0) {
+ int e = WSAGetLastError();
+ if (e == WSAECONNRESET || e == WSAECONNABORTED || e == WSAESHUTDOWN) {
+ readc = 0;
+ }
+ }
+#endif
+
+ if (readc < 0) {
+ return nixio__perror_s(L);
+ } else {
+ lua_pushlstring(L, buffer, readc);
+
+ if (!from) {
+ return 1;
+ }
+ /* push address. */
+ if (sock->domain == AF_INET || sock->domain == AF_INET6) {
+ nixio_addr naddr;
+ if (!nixio__addr_parse(&naddr, (struct sockaddr *)&addr_in)) {
+ lua_pushstring(L, naddr.host);
+ lua_pushinteger(L, naddr.port);
+ return 3;
+ } else {
+ return 1;
+ }
+ }
+#ifndef __WINNT__
+ else if (sock->domain == AF_UNIX && alen > sizeof(sa_family_t)) {
+ /* if first char is non-null then the path is not in the
+ abstract namespace and alen includes the trailing null */
+ if (addr_un.sun_path[0])
+ --alen;
+ lua_pushlstring(L, addr_un.sun_path, alen - sizeof(sa_family_t));
+ return 2;
+ }
+#endif
+ }
+ return 1;
+}
+
+/**
+ * recv(count)
+ */
+static int nixio_sock_recv(lua_State *L) {
+ return nixio_sock__recvfrom(L, 0);
+}
+
+/**
+ * recvfrom(count)
+ */
+static int nixio_sock_recvfrom(lua_State *L) {
+ return nixio_sock__recvfrom(L, 1);
+}
+
+
+/* module table */
+static const luaL_reg M[] = {
+ {"send", nixio_sock_send},
+ {"sendto", nixio_sock_sendto},
+ {"recv", nixio_sock_recv},
+ {"recvfrom",nixio_sock_recvfrom},
+ {"write", nixio_sock_send},
+ {"read", nixio_sock_recv},
+ {NULL, NULL}
+};
+
+void nixio_open_io(lua_State *L) {
+ lua_pushvalue(L, -2);
+ luaL_register(L, NULL, M);
+ lua_pop(L, 1);
+}
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