1 files changed, 141 insertions, 0 deletions
diff --git a/src/l_rawio.c b/src/l_rawio.c
new file mode 100644
index 0000000..25d98ee
--- /dev/null
+++ b/src/l_rawio.c
@@ -0,0 +1,141 @@
+/*
+ *  gcsd
+ *
+ *  gcsd the generic command sequencer daemon can be used to serialize 
+ *  commands sent over various paralell communication channels to a
+ *  single command output. It can be seen as a multiplexer for any
+ *  kind of communication between a single resource and various clients
+ *  which want to submit commands to it or query information from it.
+ *  gcsd is written in C and Lua. The goal is to provide an easy to 
+ *  understand high level API based on Lua which can be used to
+ *  implement the business logic of the so formed multiplexer daemon.
+ *  
+ *
+ *  Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
+ *                          Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of gcsd.
+ *
+ *  gcsd is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  gcsd is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with gcsd. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <lua.h>
+#include <lauxlib.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+#include "l_rawio.h"
+
+
+static int l_rawio_open(lua_State *L)
+{
+  const char* filename = luaL_checkstring(L,1);
+  const char* mode_str = luaL_checkstring(L,2);
+  int mode = 0;
+
+  if(strstr(mode_str, "O_RDONLY")) mode |= O_RDONLY;
+  if(strstr(mode_str, "O_WRONLY")) mode |= O_WRONLY;
+  if(strstr(mode_str, "O_RDWR")) mode |= O_RDWR;  
+  int fd = open(filename, mode);
+
+  lua_pushinteger(L, fd);
+  return 1;
+}
+
+static int l_rawio_setnonblock(lua_State *L)
+{
+  int fd = luaL_checkinteger(L,1); 
+  int ret = fcntl(fd, F_SETFL, O_NONBLOCK);
+
+  if(ret == -1) {
+    lua_pushnil(L);
+// FIXXXXXME: strerror is not threadsafe!!!
+    lua_pushstring(L, strerror(errno));
+    return 2;
+  }
+  lua_pushboolean(L, 1);
+  return 1;
+}
+
+static int l_rawio_write(lua_State *L)
+{
+  int fd = luaL_checkinteger(L,1);
+  size_t len = 0;
+  const char* data = luaL_checklstring(L, 2, &len);
+  
+  int ret = write(fd, data, len);
+  
+  if(ret == -1) {
+    lua_pushnil(L);
+// FIXXXXXME: strerror is not threadsafe!!!
+    lua_pushstring(L, strerror(errno));
+    return 2;
+  }
+  lua_pushinteger(L, ret);
+  return 1;
+}
+
+static int l_rawio_read(lua_State *L)
+{
+  int fd = luaL_checkinteger(L,1);
+  size_t len = luaL_checkinteger(L,2);
+  char* data = malloc(len);
+  if(!data) {
+    lua_pushboolean(L, 0);
+    lua_pushstring(L, "bad alloc");
+    return 2;
+  }
+    
+  int ret = read(fd, data, len);
+  
+  if(ret == -1) {
+    lua_pushnil(L);
+// FIXXXXXME: strerror is not threadsafe!!!
+    lua_pushstring(L, strerror(errno));
+    free(data);
+    return 2;
+  }
+  lua_pushlstring(L, data, ret);
+  free(data);
+  return 1;
+}
+
+static int l_rawio_close(lua_State *L)
+{
+  close(luaL_checkinteger(L,1));
+  return 0;
+}
+
+static const struct luaL_reg rawio_funcs [] = {
+  { "open", l_rawio_open },
+  { "setnonblock", l_rawio_setnonblock },
+  { "write", l_rawio_write },
+  { "read", l_rawio_read },
+  { "close", l_rawio_close },
+  { NULL, NULL }
+};
+
+
+LUALIB_API int luaopen_rawio(lua_State *L) 
+{
+  luaL_register(L, LUA_RAWIOLIBNAME, rawio_funcs);
+  return 1;
+}