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/*
* This file is part of LEM, a Lua Event Machine.
* Copyright 2011-2012 Emil Renner Berthing
*
* LEM 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 (at your option) any later version.
*
* LEM 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 LEM. If not, see <http://www.gnu.org/licenses/>.
*/
struct lem_sendfile {
int fd;
off_t size;
};
static int
sendfile_open(lua_State *T)
{
const char *path = luaL_checkstring(T, 1);
int fd;
struct stat buf;
struct lem_sendfile *f;
fd = open(path, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
int err = errno;
lua_pushnil(T);
switch (err) {
case ENOENT:
lua_pushliteral(T, "not found");
break;
case EACCES:
lua_pushliteral(T, "permission denied");
break;
default:
lua_pushstring(T, strerror(err));
}
return 2;
}
if (fstat(fd, &buf)) {
lua_pushnil(T);
lua_pushstring(T, strerror(errno));
(void)close(fd);
return 2;
}
/* create userdata and set the metatable */
f = lua_newuserdata(T, sizeof(struct lem_sendfile));
lua_pushvalue(T, lua_upvalueindex(1));
lua_setmetatable(T, -2);
/* initialize userdata */
f->fd = fd;
f->size = buf.st_size;
return 1;
}
static int
sendfile_gc(lua_State *T)
{
struct lem_sendfile *f = lua_touserdata(T, 1);
if (f->fd < 0)
return 0;
(void)close(f->fd);
return 0;
}
static int
sendfile_close(lua_State *T)
{
struct lem_sendfile *f;
luaL_checktype(T, 1, LUA_TUSERDATA);
f = lua_touserdata(T, 1);
if (f->fd < 0) {
lua_pushnil(T);
lua_pushliteral(T, "already closed");
return 2;
}
if (close(f->fd)) {
lua_pushnil(T);
lua_pushstring(T, strerror(errno));
return 2;
}
f->fd = -1;
lua_pushboolean(T, 1);
return 1;
}
static int
sendfile_size(lua_State *T)
{
struct lem_sendfile *f;
luaL_checktype(T, 1, LUA_TUSERDATA);
f = lua_touserdata(T, 1);
if (f->fd < 0) {
lua_pushnil(T);
lua_pushliteral(T, "closed");
return 2;
}
lua_pushnumber(T, (lua_Number)f->size);
return 1;
}
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