1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
/*
* 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 <stdio.h>
#include <string.h>
#include <errno.h>
#define VERSION 0.1
/* pushes nil, error number and errstring on the stack */
int nixio__perror(lua_State *L) {
if (errno == EAGAIN) {
lua_pushboolean(L, 0);
} else {
lua_pushnil(L);
}
lua_pushinteger(L, errno);
lua_pushstring(L, strerror(errno));
return 3;
}
/* pushes true, if operation succeeded, otherwise call nixio__perror */
int nixio__pstatus(lua_State *L, int condition) {
if (condition) {
lua_pushboolean(L, 1);
return 1;
} else {
return nixio__perror(L);
}
}
/* checks whether the first argument is a socket and returns it */
nixio_sock* nixio__checksock(lua_State *L) {
nixio_sock *sock = (nixio_sock*)luaL_checkudata(L, 1, NIXIO_META);
luaL_argcheck(L, sock->fd != -1, 1, "invalid socket object");
return sock;
}
FILE* nixio__checkfile(lua_State *L) {
FILE **fpp = (FILE**)luaL_checkudata(L, 1, NIXIO_FILE_META);
luaL_argcheck(L, *fpp, 1, "invalid file object");
return *fpp;
}
/* read fd from nixio_sock object */
int nixio__checksockfd(lua_State *L) {
return nixio__checksock(L)->fd;
}
/* return any possible fd, otherwise error out */
int nixio__checkfd(lua_State *L, int ud) {
int fd = nixio__tofd(L, ud);
return (fd != -1) ? fd : luaL_argerror(L, ud, "invalid file descriptor");
}
/* return any possible fd */
int nixio__tofd(lua_State *L, int ud) {
void *udata = lua_touserdata(L, ud);
int fd = -1;
if (lua_getmetatable(L, ud)) {
luaL_getmetatable(L, NIXIO_META);
luaL_getmetatable(L, NIXIO_FILE_META);
luaL_getmetatable(L, LUA_FILEHANDLE);
if (lua_rawequal(L, -3, -4)) {
fd = ((nixio_sock*)udata)->fd;
} else if (lua_rawequal(L, -2, -4) || lua_rawequal(L, -1, -4)) {
fd = (*((FILE **)udata)) ? fileno(*((FILE **)udata)) : -1;
}
lua_pop(L, 4);
}
return fd;
}
/* object table */
static const luaL_reg R[] = {
{NULL, NULL}
};
/* entry point */
LUALIB_API int luaopen_nixio(lua_State *L) {
/* create metatable */
luaL_newmetatable(L, NIXIO_META);
/* metatable.__index = metatable */
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
/* register module */
luaL_register(L, "nixio", R);
/* register metatable as socket_meta */
lua_pushvalue(L, -2);
lua_setfield(L, -2, "socket_meta");
/* register methods */
nixio_open_file(L);
nixio_open_socket(L);
nixio_open_sockopt(L);
nixio_open_bind(L);
nixio_open_address(L);
nixio_open_poll(L);
nixio_open_io(L);
nixio_open_splice(L);
/* module version */
lua_pushnumber(L, VERSION);
lua_setfield(L, -2, "version");
/* remove meta table */
lua_remove(L, -2);
return 1;
}
|
