summaryrefslogtreecommitdiff
path: root/init/msvc.c
blob: d72ddce1e0d3426972423db1ab0d6e7b750fc353 (plain)
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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/*
 *  minit version 0.9.1 by Felix von Leitner
 *  ported to busybox by Glenn McGrath <bug1@optushome.com.au>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <sys/fcntl.h>
#include <sys/file.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "busybox.h"

static int infd, outfd;

static char buf[1500];

static unsigned int fmt_ulong(char *dest, unsigned long i)
{
	register unsigned long len, tmp, len2;

	/* first count the number of bytes needed */
	for (len = 1, tmp = i; tmp > 9; ++len)
		tmp /= 10;
	if (dest)
		for (tmp = i, dest += len, len2 = len + 1; --len2; tmp /= 10)
			*--dest = (tmp % 10) + '0';
	return len;
}

static void addservice(char *service)
{
	char *service_ptr;

	if (strncmp(service, "/etc/minit/", 11) == 0) {
		service += 11;
	}

	while ((service_ptr = last_char_is(service, '/')) != NULL) {
		*service_ptr = 0;
	}
	strncpy(buf + 1, service, 1400);
	buf[1400] = 0;
}

static int addreadwrite(char *service)
{
	addservice(service);
	write(infd, buf, strlen(buf));
	return read(outfd, buf, 1500);
}

/* return PID, 0 if error */
static pid_t __readpid(char *service)
{
	int len;

	buf[0] = 'p';
	len = addreadwrite(service);
	if (len < 0)
		return 0;
	buf[len] = 0;
	return atoi(buf);
}

/* return nonzero if error */
static int respawn(char *service, int yesno)
{
	int len;

	buf[0] = yesno ? 'R' : 'r';
	len = addreadwrite(service);
	return (len != 1 || buf[0] == '0');
}

/* return nonzero if error */
static int startservice(char *service)
{
	int len;

	buf[0] = 's';
	len = addreadwrite(service);
	return (len != 1 || buf[0] == '0');
}

extern int msvc_main(int argc, char **argv)
{
	if (argc < 2) {
		bb_show_usage();
	}
	infd = bb_xopen("/etc/minit/in", O_WRONLY);
	outfd = bb_xopen("/etc/minit/out", O_RDONLY);

	while (lockf(infd, F_LOCK, 1)) {
		bb_perror_msg("could not aquire lock!\n");
		sleep(1);
	}

	if (argc == 2) {
		pid_t pid = __readpid(argv[1]);

		if (buf[0] != '0') {
			int len;
			int up_time;

			printf("%s: ", argv[1]);
			if (pid == 0)
				printf("down ");
			else if (pid == 1)
				printf("finished ");
			else {
				printf("up (pid %d) ", pid);
			}

			buf[0] = 'u';
			len = addreadwrite(argv[1]);
			if (len < 0) {
				up_time = 0;
			} else {
				buf[len] = 0;
				up_time = atoi(buf);
			}
			printf("%d seconds\n", up_time);

			if (pid == 0)
				return 2;
			else if (pid == 1)
				return 3;
			else
				return 0;
		} else {
			bb_error_msg_and_die("no such service");
		}
	} else {
		int i;
		int ret = 0;
		int sig = 0;
		pid_t pid;

		if (argv[1][0] == '-') {
			switch (argv[1][1]) {
			case 'g':
				for (i = 2; i < argc; ++i) {
					pid = __readpid(argv[i]);
					if (pid < 2) {
						if (pid == 1) {
							bb_error_msg("%s, service termination", argv[i]);
						} else {
							bb_error_msg("%s, no such service", argv[i]);
						}
						ret = 1;
					}
					printf("%d\n", pid);
				}
				break;
			case 'p':
				sig = SIGSTOP;
				goto dokill;
				break;
			case 'c':
				sig = SIGCONT;
				goto dokill;
				break;
			case 'h':
				sig = SIGHUP;
				goto dokill;
				break;
			case 'a':
				sig = SIGALRM;
				goto dokill;
				break;
			case 'i':
				sig = SIGINT;
				goto dokill;
				break;
			case 't':
				sig = SIGTERM;
				goto dokill;
				break;
			case 'k':
				sig = SIGKILL;
				goto dokill;
				break;
			case 'o':
				for (i = 2; i < argc; ++i)
					if (startservice(argv[i]) || respawn(argv[i], 0)) {
						bb_error_msg("Couldnt not start %s\n", argv[i]);
						ret = 1;
					}
				break;
			case 'd':
				for (i = 2; i < argc; ++i) {
					pid = __readpid(argv[i]);
					if (pid == 0) {
						bb_error_msg("%s, no such service\n", argv[i]);
						ret = 1;
					} else if (pid == 1)
						continue;
					if (respawn(argv[i], 0) || kill(pid, SIGTERM)
						|| kill(pid, SIGCONT));
				}
				break;
			case 'u':
				for (i = 2; i < argc; ++i) {
					if (startservice(argv[i]) || respawn(argv[i], 1)) {
						bb_error_msg("Couldnt not start %s\n", argv[i]);
						ret = 1;
					}
					break;
				}
			case 'C':
				for (i = 2; i < argc; ++i) {
					int len;

					buf[0] = 'C';
					len = addreadwrite(argv[i]);
					if (len != 1 || buf[0] == '0') {
						bb_error_msg("%s has terminated or was killed\n",
									 argv[i]);
						ret = 1;
					}
				}
				break;
			case 'P':
				pid = atoi(argv[1] + 2);
				if (pid > 1) {
					char *tmp;
					int len;

					buf[0] = 'P';
					addservice(argv[2]);
					tmp = buf + strlen(buf) + 1;
					tmp[fmt_ulong(tmp, pid)] = 0;
					write(infd, buf, strlen(buf) + strlen(tmp) + 2);
					len = read(outfd, buf, 1500);
					if (len != 1 || buf[0] == '0') {
						bb_error_msg_and_die("Couldnt not set pid of service %s\n", argv[2]);
					}
				}
				break;
			default:
				bb_show_usage();
			}
		} else {
			bb_show_usage();
		}
		return ret;
dokill:
		for (i = 2; i < argc; i++) {
			pid = __readpid(argv[i]);
			if (!pid) {
				bb_error_msg("%s no such service\n", argv[i]);
				ret = 1;
			}
			if (kill(pid, sig)) {
				bb_error_msg("%s, could not send signal %d to PID %d\n",
							 argv[i], sig, pid);
				ret = 1;
			}
		}
		return ret;
	}
}

/*
  -u   Up.  If the service is not running, start it.  If the service stops,
       restart it.
  -d   Down.  If the service is running, send it a TERM signal and then a CONT
       signal.  After it stops, do not restart it.
  -o   Once.  If the service is not running, start it.  Do not restart it if it
       stops.
  -r   Tell supervise that the service is normally running; this affects status
       messages.
  -s   Tell supervise that the service is normally stopped; this affects status
       messages.
  -p   Pause.  Send the service a STOP signal.
  -c   Continue.  Send the service a CONT signal.
  -h   Hangup.  Send the service a HUP signal.
  -a   Alarm.  Send the service an ALRM signal.
  -i   Interrupt.  Send the service an INT signal.
  -t   Terminate.  Send the service a TERM signal.
  -k   Kill.  Send the service a KILL signal.
  -x   Exit.  supervise will quit as soon as the service is down.
*/