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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* 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 <poll.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "nixio.h"
/**
* nanosleep()
*/
static int nixio_nanosleep(lua_State *L) {
struct timespec req, rem;
req.tv_sec = luaL_optint(L, 1, 0);
req.tv_nsec = luaL_optint(L, 2, 0);
int status = nanosleep(&req, &rem);
if (!status) {
lua_pushboolean(L, 1);
return 1;
} else {
if (errno == EINTR) {
lua_pushboolean(L, 0);
lua_pushinteger(L, rem.tv_sec);
lua_pushinteger(L, rem.tv_nsec);
return 3;
} else {
return nixio__perror(L);
}
}
}
/**
* Checks whether a flag is set in the bitmap and sets the matching table value
*/
static void nixio_poll_flags__r(lua_State *L, int *map, int f, const char *t) {
lua_pushstring(L, t);
if (*map & f) {
lua_pushboolean(L, 1);
} else {
lua_pushnil(L);
}
lua_rawset(L, -3);
}
/**
* Translate integer to poll flags and vice versa
*/
static int nixio_poll_flags(lua_State *L) {
int flags;
if (lua_isnumber(L, 1)) {
flags = luaL_checkinteger(L, 1);
lua_newtable(L);
nixio_poll_flags__r(L, &flags, POLLIN, "in");
nixio_poll_flags__r(L, &flags, POLLPRI, "pri");
nixio_poll_flags__r(L, &flags, POLLOUT, "out");
nixio_poll_flags__r(L, &flags, POLLERR, "err");
nixio_poll_flags__r(L, &flags, POLLHUP, "hup");
nixio_poll_flags__r(L, &flags, POLLNVAL, "nval");
} else {
flags = 0;
const int j = lua_gettop(L);
for (int i=1; i<=j; i++) {
const char *flag = luaL_checkstring(L, i);
if (!strcmp(flag, "in")) {
flags |= POLLIN;
} else if (!strcmp(flag, "pri")) {
flags |= POLLPRI;
} else if (!strcmp(flag, "out")) {
flags |= POLLOUT;
} else if (!strcmp(flag, "err")) {
flags |= POLLERR;
} else if (!strcmp(flag, "hup")) {
flags |= POLLHUP;
} else if (!strcmp(flag, "nval")) {
flags |= POLLNVAL;
} else {
return luaL_argerror(L, i,
"supported values: in, pri, out, err, hup, nval");
}
}
lua_pushinteger(L, flags);
}
return 1;
}
/**
* poll({{fd = socket, events = FLAGS}, ...}, timeout)
*/
static int nixio_poll(lua_State *L) {
int len = lua_objlen(L, 1);
int i, fd;
int timeout = luaL_optint(L, 2, 0);
int status = -1;
/* we are being abused as sleep() replacement... */
if (lua_isnoneornil(L, 1) || len < 1) {
return nixio__pstatus(L, !poll(NULL, 0, timeout));
}
luaL_checktype(L, 1, LUA_TTABLE);
struct pollfd *fds = calloc(len, sizeof(struct pollfd));
for (i = 0; i < len; i++) {
lua_rawgeti(L, 1, i+1);
if (!lua_istable(L, -1)) {
free(fds);
return luaL_argerror(L, 1, "invalid datastructure");
}
lua_pushliteral(L, "fd");
lua_rawget(L, -2);
fd = nixio__tofd(L, -1);
if (fd == -1) {
free(fds);
return luaL_argerror(L, 1, "invalid fd in datastructure");
}
fds[i].fd = fd;
lua_pushliteral(L, "events");
lua_rawget(L, -3);
fds[i].events = (short)lua_tointeger(L, -1);
lua_pop(L, 3);
}
status = poll(fds, (nfds_t)len, timeout);
if (status < 1) {
free(fds);
return nixio__perror(L);
}
for (i = 0; i < len; i++) {
lua_rawgeti(L, 1, i+1);
lua_pushliteral(L, "revents");
lua_pushinteger(L, fds[i].revents);
lua_rawset(L, -3);
lua_pop(L, 1);
}
free(fds);
lua_pushinteger(L, status);
lua_pushvalue(L, 1);
return 2;
}
/* module table */
static const luaL_reg R[] = {
{"nanosleep", nixio_nanosleep},
{"poll", nixio_poll},
{"poll_flags", nixio_poll_flags},
{NULL, NULL}
};
void nixio_open_poll(lua_State *L) {
luaL_register(L, NULL, R);
}
|
