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
|
/*
* 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.
*/
#ifdef __linux__
#define _GNU_SOURCE
#endif
#include "nixio.h"
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/param.h>
#ifndef __WINNT__
#ifndef BSD
#include <sys/sendfile.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#endif
#ifdef _GNU_SOURCE
#ifdef SPLICE_F_MOVE
/* guess what sucks... */
#ifdef __UCLIBC__
#include <unistd.h>
#include <sys/syscall.h>
ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
__off64_t *__offout, size_t __len, unsigned int __flags) {
#ifdef __NR_splice
return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
#else
(void)__fdin;
(void)__offin;
(void)__fdout;
(void)__offout;
(void)__len;
(void)__flags;
errno = ENOSYS;
return -1;
#endif
}
#undef SPLICE_F_MOVE
#undef SPLICE_F_NONBLOCK
#undef SPLICE_F_MORE
#define SPLICE_F_MOVE 1
#define SPLICE_F_NONBLOCK 2
#define SPLICE_F_MORE 4
#endif /* __UCLIBC__ */
/**
* splice(fd_in, fd_out, length, flags)
*/
static int nixio_splice(lua_State *L) {
int fd_in = nixio__checkfd(L, 1);
int fd_out = nixio__checkfd(L, 2);
size_t len = luaL_checkinteger(L, 3);
int flags = luaL_optinteger(L, 4, 0);
long spliced;
do {
spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
} while (spliced == -1 && errno == EINTR);
if (spliced < 0) {
return nixio__perror(L);
}
lua_pushnumber(L, spliced);
return 1;
}
/**
* Translate splice flags to integer
*/
static int nixio_splice_flags(lua_State *L) {
const int j = lua_gettop(L);
int flags = 0;
for (int i=1; i<=j; i++) {
const char *flag = luaL_checkstring(L, i);
if (!strcmp(flag, "move")) {
flags |= SPLICE_F_MOVE;
} else if (!strcmp(flag, "nonblock")) {
flags |= SPLICE_F_NONBLOCK;
} else if (!strcmp(flag, "more")) {
flags |= SPLICE_F_MORE;
} else {
return luaL_argerror(L, i, "supported values: "
"move, nonblock, more");
}
}
lua_pushinteger(L, flags);
return 1;
}
#endif /* SPLICE_F_MOVE */
#endif /* _GNU_SOURCE */
/**
* sendfile(outfd, infd, length)
*/
static int nixio_sendfile(lua_State *L) {
int sock = nixio__checksockfd(L);
int infd = nixio__checkfd(L, 2);
size_t len = luaL_checkinteger(L, 3);
off_t spliced;
#ifndef BSD
do {
spliced = sendfile(sock, infd, NULL, len);
} while (spliced == -1 && errno == EINTR);
if (spliced == -1) {
return nixio__perror(L);
}
#else
int r;
const off_t offset = lseek(infd, 0, SEEK_CUR);
do {
r = sendfile(infd, sock, offset, len, NULL, &spliced, 0);
} while (r == -1 && errno == EINTR);
if (r == -1) {
return nixio__perror(L);
}
#endif
lua_pushnumber(L, spliced);
return 1;
}
/* module table */
static const luaL_reg R[] = {
#ifdef _GNU_SOURCE
#ifdef SPLICE_F_MOVE
{"splice", nixio_splice},
{"splice_flags", nixio_splice_flags},
#endif
#endif
{"sendfile", nixio_sendfile},
{NULL, NULL}
};
void nixio_open_splice(lua_State *L) {
luaL_register(L, NULL, R);
}
#else /* __WINNT__ */
void nixio_open_splice(lua_State *L) {
}
#endif /* !__WINNT__ */
|
