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
182
183
184
185
|
/*
* 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 <pwd.h>
#include <grp.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <signal.h>
static int nixio_fork(lua_State *L) {
pid_t pid = fork();
if (pid == -1) {
return nixio__perror(L);
} else {
lua_pushinteger(L, pid);
return 1;
}
}
static int nixio_signal(lua_State *L) {
int sig = luaL_checkinteger(L, 1);
const char *val = luaL_checkstring(L, 2);
if (!strcmp(val, "ign") || !strcmp(val, "ignore")) {
return nixio__pstatus(L, signal(sig, SIG_IGN) != SIG_ERR);
} else if (!strcmp(val, "dfl") || !strcmp(val, "default")) {
return nixio__pstatus(L, signal(sig, SIG_DFL) != SIG_ERR);
} else {
return luaL_argerror(L, 2, "supported values: ign, dfl");
}
}
static int nixio_wait(lua_State *L) {
pid_t pidin = luaL_optinteger(L, 1, -1), pidout;
int options = 0, status;
const int j = lua_gettop(L);
for (int i=2; i<=j; i++) {
const char *flag = luaL_checkstring(L, i);
if (!strcmp(flag, "nohang")) {
options |= WNOHANG;
} else if (!strcmp(flag, "untraced")) {
options |= WUNTRACED;
} else if (!strcmp(flag, "continued")) {
options |= WCONTINUED;
} else {
return luaL_argerror(L, i,
"supported values: nohang, untraced, continued");
}
}
do {
pidout = waitpid(pidin, &status, options);
} while (pidout == -1 && errno == EINTR);
if (pidout == 0) {
lua_pushboolean(L, 0);
return 1;
} else if (pidout == -1) {
return nixio__perror(L);
} else {
lua_pushinteger(L, pidout);
}
if (WIFEXITED(status)) {
lua_pushliteral(L, "exited");
lua_pushinteger(L, WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
lua_pushliteral(L, "signaled");
lua_pushinteger(L, WTERMSIG(status));
} else if (WIFSTOPPED(status)) {
lua_pushliteral(L, "stopped");
lua_pushinteger(L, WSTOPSIG(status));
} else {
return 1;
}
return 3;
}
static int nixio_kill(lua_State *L) {
return nixio__pstatus(L, !kill(luaL_checkint(L, 1), luaL_checkint(L, 2)));
}
static int nixio_getpid(lua_State *L) {
lua_pushinteger(L, getpid());
return 1;
}
static int nixio_getppid(lua_State *L) {
lua_pushinteger(L, getppid());
return 1;
}
static int nixio_getuid(lua_State *L) {
lua_pushinteger(L, getuid());
return 1;
}
static int nixio_getgid(lua_State *L) {
lua_pushinteger(L, getgid());
return 1;
}
static int nixio_setgid(lua_State *L) {
gid_t gid;
if (lua_isstring(L, 1)) {
struct group *g = getgrnam(lua_tostring(L, 1));
gid = (!g) ? -1 : g->gr_gid;
} else if (lua_isnumber(L, 1)) {
gid = lua_tointeger(L, 1);
} else {
return luaL_argerror(L, 1, "supported values: <groupname>, <gid>");
}
return nixio__pstatus(L, !setgid(gid));
}
static int nixio_setuid(lua_State *L) {
uid_t uid;
if (lua_isstring(L, 1)) {
struct passwd *p = getpwnam(lua_tostring(L, 1));
uid = (!p) ? -1 : p->pw_uid;
} else if (lua_isnumber(L, 1)) {
uid = lua_tointeger(L, 1);
} else {
return luaL_argerror(L, 1, "supported values: <username>, <uid>");
}
return nixio__pstatus(L, !setuid(uid));
}
static int nixio_nice(lua_State *L) {
int nval = luaL_checkint(L, 1);
errno = 0;
nval = nice(nval);
if (nval == -1 && errno) {
return nixio__perror(L);
} else {
lua_pushinteger(L, nval);
return 1;
}
}
/* module table */
static const luaL_reg R[] = {
{"fork", nixio_fork},
{"wait", nixio_wait},
{"kill", nixio_kill},
{"nice", nixio_nice},
{"getpid", nixio_getpid},
{"getppid", nixio_getppid},
{"getuid", nixio_getuid},
{"getgid", nixio_getgid},
{"setuid", nixio_setuid},
{"setgid", nixio_setgid},
{"signal", nixio_signal},
{NULL, NULL}
};
void nixio_open_process(lua_State *L) {
luaL_register(L, NULL, R);
}
|
