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#include "lua.h"
#include "lauxlib.h"
#include <sys/stat.h>
#include <mqueue.h>
#define _XOPEN_SOURCE 600
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#define MQD_TYPENAME "mqd_t"
#include "lua-mq.h"
static const struct { char c; mode_t b; } M[] =
{
{'r', S_IRUSR}, {'w', S_IWUSR}, {'x', S_IXUSR},
{'r', S_IRGRP}, {'w', S_IWGRP}, {'x', S_IXGRP},
{'r', S_IROTH}, {'w', S_IWOTH}, {'x', S_IXOTH},
};
static int get_mode(mode_t *mode, const char* modestr)
{
int i;
*mode = S_IRWXU;
for (i=0; i<9; i++) {
if(*modestr == 0) break;
if(*modestr == M[i].c)
*mode |= M[i].b;
else if(*modestr == '-')
*mode &= ~M[i].b;
else if(*modestr == 's') {
switch(i) {
case 2: *mode |= S_ISUID | S_IXUSR; break;
case 5: *mode |= S_ISGID | S_IXGRP; break;
default: return -1; break;
}
}
modestr++;
}
return 0;
}
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 void push_errno(lua_State *L)
{
char msg[255];
int ret;
ret = strerror_r(errno, msg, sizeof(msg));
if(!ret)
lua_pushstring(L, msg);
else
lua_pushstring(L, "unknown error");
}
static int l_mq_create(lua_State *L)
{
mqd_t id, *ptr;
int flags, ret;
mode_t mode;
flags = get_oflags(luaL_optstring(L, 2, ""));
ret = get_mode(&mode, luaL_optstring(L, 3, ""));
if(ret) {
lua_pushnil(L);
lua_pushstring(L, "invalid mode specifier");
return 2;
}
id = mq_open(luaL_checkstring(L, 1), flags | O_CREAT, mode, NULL);
if(id == (mqd_t)-1) {
lua_pushnil(L);
push_errno(L);
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_mq_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);
push_errno(L);
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_mq_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);
push_errno(L);
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static int l_mq_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);
push_errno(L);
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);
push_errno(L);
return 2;
}
lua_pushlstring(L, str, len);
free(str);
lua_pushinteger(L, prio);
return 2;
}
static int l_mq_close(lua_State *L)
{
mqd_t* id;
id = luaL_checkudata(L, 1, MQD_TYPENAME);
if(mq_close(*id)) {
lua_pushnil(L);
push_errno(L);
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static int l_mq_unlink(lua_State *L)
{
if(mq_unlink(luaL_checkstring(L, 1))) {
lua_pushnil(L);
push_errno(L);
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static const struct luaL_Reg mq_funcs [] = {
{ "create", l_mq_create },
{ "open", l_mq_open },
{ "send", l_mq_send },
{ "receive", l_mq_receive },
{ "close", l_mq_close },
{ "unlink", l_mq_unlink },
{ NULL, NULL }
};
LUALIB_API int luaopen_mq(lua_State *L)
{
#if LUA_VERSION_NUM > 501
lua_newtable(L);
luaL_setfuncs(L, mq_funcs, 0);
/* since Lua 5.2 libs shouldn't do that anymore... */
/* lua_pushvalue(L, -1); */
/* lua_setglobal(L, "mq"); */
#else
luaL_register(L, "mq", mq_funcs);
#endif
return 1;
}
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