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#include "lua.h"
#include "lauxlib.h"
#include <sys/stat.h>
#include <mqueue.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#define MQD_TYPENAME "mqd_t"
LUALIB_API int luaopen_luamq(lua_State *L);
static int get_oflags(const char* flagstr)
{
if(!strcmp(flagstr, "ro"))
return O_RDONLY;
if(!strcmp(flagstr, "wo"))
return O_WRONLY;
return O_RDWR;
}
static int l_luamq_create(lua_State *L)
{
mqd_t id, *ptr;
int flags;
flags = get_oflags(luaL_optlstring(L, 2, "", NULL));
id = mq_open(luaL_checkstring(L, 1), flags | O_CREAT, S_IRWXU | S_IRWXG, NULL);
if(id == (mqd_t)-1) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
ptr = (mqd_t*)lua_newuserdata(L, sizeof(mqd_t));
*ptr = id;
luaL_newmetatable(L, MQD_TYPENAME);
lua_setmetatable(L, -2);
return 1;
}
static int l_luamq_open(lua_State *L)
{
mqd_t id, *ptr;
int flags;
flags = get_oflags(luaL_optlstring(L, 2, "", NULL));
id = mq_open(luaL_checkstring(L, 1), flags);
if(id == (mqd_t)-1) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
ptr = (mqd_t*)lua_newuserdata(L, sizeof(mqd_t));
*ptr = id;
luaL_newmetatable(L, MQD_TYPENAME);
lua_setmetatable(L, -2);
return 1;
}
static int l_luamq_send(lua_State *L)
{
mqd_t* id;
unsigned int prio;
size_t len;
const char* str;
id = luaL_checkudata(L, 1, MQD_TYPENAME);
str = luaL_checklstring(L, 2, &len);
prio = luaL_optint(L, 3, 0);
if(mq_send(*id, str, len, prio)) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static int l_luamq_receive(lua_State *L)
{
mqd_t* id;
unsigned int prio;
struct mq_attr attr;
ssize_t len;
char* str;
id = luaL_checkudata(L, 1, MQD_TYPENAME);
if(mq_getattr(*id, &attr)) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
len = attr.mq_msgsize;
str = malloc(len);
if(!str) {
lua_pushnil(L);
lua_pushstring(L, "bad alloc");
return 2;
}
len = mq_receive(*id, str, len, &prio);
if(len < 0) {
free(str);
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
lua_pushlstring(L, str, len);
free(str);
lua_pushinteger(L, prio);
return 2;
}
static int l_luamq_close(lua_State *L)
{
mqd_t* id;
id = luaL_checkudata(L, 1, MQD_TYPENAME);
if(mq_close(*id)) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static int l_luamq_unlink(lua_State *L)
{
if(mq_unlink(luaL_checkstring(L, 1))) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno)); /* TODO: thread safety */
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static const struct luaL_reg luamq_funcs [] = {
{ "create", l_luamq_create },
{ "open", l_luamq_open },
{ "send", l_luamq_send },
{ "receive", l_luamq_receive },
{ "close", l_luamq_close },
{ "unlink", l_luamq_unlink },
{ NULL, NULL }
};
LUALIB_API int luaopen_luamq(lua_State *L)
{
luaL_register(L, "luamq", luamq_funcs);
return 1;
}
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