Commit | Line | Data |
---|---|---|
abf0db3c | 1 | static char *sccsid = "@(#)init.c 4.3 (Berkeley) %G%"; |
7c8ab0e6 BJ |
2 | #include <signal.h> |
3 | #include <sys/types.h> | |
4 | #include <utmp.h> | |
5 | #include <setjmp.h> | |
215943cc | 6 | #include <sys/reboot.h> |
7c8ab0e6 BJ |
7 | |
8 | #define LINSIZ sizeof(wtmp.ut_line) | |
9 | #define TABSIZ 100 | |
10 | #define ALL p = &itab[0]; p < &itab[TABSIZ]; p++ | |
11 | #define EVER ;; | |
12 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) | |
13 | #define SCMPN(a, b) strncmp(a, b, sizeof(a)) | |
14 | ||
15 | char shell[] = "/bin/sh"; | |
215943cc | 16 | char getty[] = "/etc/getty"; |
7c8ab0e6 BJ |
17 | char minus[] = "-"; |
18 | char runc[] = "/etc/rc"; | |
19 | char ifile[] = "/etc/ttys"; | |
20 | char utmp[] = "/etc/utmp"; | |
21 | char wtmpf[] = "/usr/adm/wtmp"; | |
22 | char ctty[] = "/dev/console"; | |
23 | char dev[] = "/dev/"; | |
24 | ||
25 | struct utmp wtmp; | |
26 | struct | |
27 | { | |
28 | char line[LINSIZ]; | |
29 | char comn; | |
30 | char flag; | |
31 | } line; | |
32 | struct tab | |
33 | { | |
34 | char line[LINSIZ]; | |
35 | char comn; | |
36 | char xflag; | |
37 | int pid; | |
38 | } itab[TABSIZ]; | |
39 | ||
40 | int fi; | |
41 | int mergflag; | |
42 | char tty[20]; | |
abf0db3c | 43 | jmp_buf sjbuf, shutpass; |
7c8ab0e6 BJ |
44 | |
45 | int reset(); | |
46 | char *strcpy(), *strcat(); | |
47 | long lseek(); | |
48 | ||
49 | main() | |
50 | { | |
215943cc BJ |
51 | register int r11; /* passed thru from boot */ |
52 | int howto, oldhowto; | |
53 | ||
54 | howto = r11; | |
7c8ab0e6 BJ |
55 | setjmp(sjbuf); |
56 | signal(SIGTERM, reset); | |
57 | signal(SIGSTOP, SIG_IGN); | |
58 | signal(SIGTSTP, SIG_IGN); | |
59 | signal(SIGTTIN, SIG_IGN); | |
60 | signal(SIGTTOU, SIG_IGN); | |
61 | for(EVER) { | |
215943cc BJ |
62 | oldhowto = howto; |
63 | howto = RB_SINGLE; | |
abf0db3c BJ |
64 | if (setjmp(shutpass) == 0) |
65 | shutdown(); | |
215943cc BJ |
66 | if (oldhowto & RB_SINGLE) |
67 | single(); | |
68 | if (runcom(oldhowto) == 0) | |
69 | continue; | |
7c8ab0e6 BJ |
70 | merge(); |
71 | multiple(); | |
72 | } | |
73 | } | |
74 | ||
abf0db3c BJ |
75 | int shutreset(); |
76 | ||
7c8ab0e6 BJ |
77 | shutdown() |
78 | { | |
79 | register i; | |
80 | register struct tab *p; | |
81 | ||
82 | close(creat(utmp, 0644)); | |
83 | signal(SIGHUP, SIG_IGN); | |
84 | for(ALL) { | |
85 | term(p); | |
86 | p->line[0] = 0; | |
87 | } | |
abf0db3c BJ |
88 | signal(SIGALRM, shutreset); |
89 | alarm(30); | |
7c8ab0e6 BJ |
90 | for(i=0; i<5; i++) |
91 | kill(-1, SIGKILL); | |
92 | while(wait((int *)0) != -1) | |
93 | ; | |
94 | alarm(0); | |
abf0db3c BJ |
95 | shutend(); |
96 | } | |
97 | ||
98 | char shutfailm[] = "WARNING: Something is hung (wont die); ps axl advised\n"; | |
99 | ||
100 | shutreset() | |
101 | { | |
102 | int status; | |
103 | ||
104 | if (fork() == 0) { | |
105 | int ct = open(ctty, 1); | |
106 | write(ct, shutfailm, sizeof (shutfailm)); | |
107 | sleep(5); | |
108 | exit(1); | |
109 | } | |
110 | sleep(5); | |
111 | shutend(); | |
112 | longjmp(shutpass, 1); | |
113 | } | |
114 | ||
115 | shutend() | |
116 | { | |
117 | register i; | |
118 | ||
7c8ab0e6 BJ |
119 | signal(SIGALRM, SIG_DFL); |
120 | for(i=0; i<10; i++) | |
121 | close(i); | |
122 | } | |
123 | ||
124 | single() | |
125 | { | |
126 | register pid; | |
127 | ||
128 | pid = fork(); | |
129 | if(pid == 0) { | |
130 | /* | |
131 | alarm(300); | |
132 | */ | |
133 | signal(SIGTERM, SIG_DFL); | |
134 | signal(SIGHUP, SIG_DFL); | |
135 | signal(SIGALRM, SIG_DFL); | |
136 | open(ctty, 2); | |
137 | dup(0); | |
138 | dup(0); | |
139 | execl(shell, minus, (char *)0); | |
140 | exit(0); | |
141 | } | |
142 | while(wait((int *)0) != pid) | |
143 | ; | |
144 | } | |
145 | ||
215943cc BJ |
146 | runcom(oldhowto) |
147 | int oldhowto; | |
7c8ab0e6 BJ |
148 | { |
149 | register pid, f; | |
215943cc | 150 | int status; |
7c8ab0e6 BJ |
151 | |
152 | pid = fork(); | |
153 | if(pid == 0) { | |
154 | open("/", 0); | |
155 | dup(0); | |
156 | dup(0); | |
215943cc BJ |
157 | if (oldhowto & RB_SINGLE) |
158 | execl(shell, shell, runc, (char *)0); | |
159 | else | |
160 | execl(shell, shell, runc, "autoboot", (char *)0); | |
161 | exit(1); | |
7c8ab0e6 | 162 | } |
215943cc | 163 | while(wait(&status) != pid) |
7c8ab0e6 | 164 | ; |
215943cc BJ |
165 | if(status) |
166 | return(0); | |
7c8ab0e6 BJ |
167 | f = open(wtmpf, 1); |
168 | if (f >= 0) { | |
169 | lseek(f, 0L, 2); | |
170 | SCPYN(wtmp.ut_line, "~"); | |
171 | SCPYN(wtmp.ut_name, "reboot"); | |
172 | time(&wtmp.ut_time); | |
173 | write(f, (char *)&wtmp, sizeof(wtmp)); | |
174 | close(f); | |
175 | } | |
215943cc | 176 | return(1); |
7c8ab0e6 BJ |
177 | } |
178 | ||
179 | setmerge() | |
180 | { | |
181 | ||
182 | signal(SIGHUP, setmerge); | |
183 | mergflag = 1; | |
184 | } | |
185 | ||
186 | multiple() | |
187 | { | |
188 | register struct tab *p; | |
189 | register pid; | |
190 | ||
191 | loop: | |
192 | mergflag = 0; | |
193 | signal(SIGHUP, setmerge); | |
194 | for(EVER) { | |
195 | pid = wait((int *)0); | |
196 | if(mergflag) { | |
197 | merge(); | |
198 | goto loop; | |
199 | } | |
200 | if(pid == -1) | |
201 | return; | |
202 | for(ALL) | |
203 | if(p->pid == pid || p->pid == -1) { | |
204 | rmut(p); | |
205 | dfork(p); | |
206 | } | |
207 | } | |
208 | } | |
209 | ||
210 | term(p) | |
211 | register struct tab *p; | |
212 | { | |
213 | ||
214 | if(p->pid != 0) { | |
215 | rmut(p); | |
216 | kill(p->pid, SIGKILL); | |
217 | } | |
218 | p->pid = 0; | |
219 | } | |
220 | ||
221 | rline() | |
222 | { | |
223 | register c, i; | |
224 | ||
225 | loop: | |
226 | c = get(); | |
227 | if(c < 0) | |
228 | return(0); | |
229 | if(c == 0) | |
230 | goto loop; | |
231 | line.flag = c; | |
232 | c = get(); | |
233 | if(c <= 0) | |
234 | goto loop; | |
235 | line.comn = c; | |
236 | SCPYN(line.line, ""); | |
237 | for (i=0; i<LINSIZ; i++) { | |
238 | c = get(); | |
239 | if(c <= 0) | |
240 | break; | |
241 | line.line[i] = c; | |
242 | } | |
243 | while(c > 0) | |
244 | c = get(); | |
245 | if(line.line[0] == 0) | |
246 | goto loop; | |
247 | if(line.flag == '0') | |
248 | goto loop; | |
249 | strcpy(tty, dev); | |
250 | strncat(tty, line.line, LINSIZ); | |
251 | if(access(tty, 06) < 0) | |
252 | goto loop; | |
253 | return(1); | |
254 | } | |
255 | ||
256 | get() | |
257 | { | |
258 | char b; | |
259 | ||
260 | if(read(fi, &b, 1) != 1) | |
261 | return(-1); | |
262 | if(b == '\n') | |
263 | return(0); | |
264 | return(b); | |
265 | } | |
266 | ||
267 | #define FOUND 1 | |
268 | #define CHANGE 2 | |
269 | ||
270 | merge() | |
271 | { | |
272 | register struct tab *p; | |
273 | ||
274 | fi = open(ifile, 0); | |
275 | if(fi < 0) | |
276 | return; | |
277 | for(ALL) | |
278 | p->xflag = 0; | |
279 | while(rline()) { | |
280 | for(ALL) { | |
281 | if (SCMPN(p->line, line.line)) | |
282 | continue; | |
283 | p->xflag |= FOUND; | |
284 | if(line.comn != p->comn) { | |
285 | p->xflag |= CHANGE; | |
286 | p->comn = line.comn; | |
287 | } | |
288 | goto contin1; | |
289 | } | |
290 | for(ALL) { | |
291 | if(p->line[0] != 0) | |
292 | continue; | |
293 | SCPYN(p->line, line.line); | |
294 | p->xflag |= FOUND|CHANGE; | |
295 | p->comn = line.comn; | |
296 | goto contin1; | |
297 | } | |
298 | contin1: | |
299 | ; | |
300 | } | |
301 | close(fi); | |
302 | for(ALL) { | |
303 | if((p->xflag&FOUND) == 0) { | |
304 | term(p); | |
305 | p->line[0] = 0; | |
306 | } | |
307 | if((p->xflag&CHANGE) != 0) { | |
308 | term(p); | |
309 | dfork(p); | |
310 | } | |
311 | } | |
312 | } | |
313 | ||
314 | dfork(p) | |
315 | struct tab *p; | |
316 | { | |
317 | register pid; | |
318 | ||
319 | pid = fork(); | |
320 | if(pid == 0) { | |
321 | signal(SIGTERM, SIG_DFL); | |
322 | signal(SIGHUP, SIG_IGN); | |
323 | strcpy(tty, dev); | |
324 | strncat(tty, p->line, LINSIZ); | |
325 | chown(tty, 0, 0); | |
326 | chmod(tty, 0622); | |
327 | open(tty, 2); | |
328 | vhangup(); | |
329 | signal(SIGHUP, SIG_DFL); | |
330 | open(tty, 2); | |
331 | close(0); | |
332 | dup(1); | |
333 | dup(0); | |
334 | tty[0] = p->comn; | |
335 | tty[1] = 0; | |
336 | execl(getty, minus, tty, (char *)0); | |
337 | exit(0); | |
338 | } | |
339 | p->pid = pid; | |
340 | } | |
341 | ||
342 | rmut(p) | |
343 | register struct tab *p; | |
344 | { | |
345 | register f; | |
346 | ||
347 | f = open(utmp, 2); | |
348 | if(f >= 0) { | |
349 | while(read(f, (char *)&wtmp, sizeof(wtmp)) == sizeof(wtmp)) { | |
350 | if (SCMPN(wtmp.ut_line, p->line)) | |
351 | continue; | |
352 | lseek(f, -(long)sizeof(wtmp), 1); | |
353 | SCPYN(wtmp.ut_name, ""); | |
354 | time(&wtmp.ut_time); | |
355 | write(f, (char *)&wtmp, sizeof(wtmp)); | |
356 | } | |
357 | close(f); | |
358 | } | |
359 | f = open(wtmpf, 1); | |
360 | if (f >= 0) { | |
361 | SCPYN(wtmp.ut_line, p->line); | |
362 | SCPYN(wtmp.ut_name, ""); | |
363 | time(&wtmp.ut_time); | |
364 | lseek(f, (long)0, 2); | |
365 | write(f, (char *)&wtmp, sizeof(wtmp)); | |
366 | close(f); | |
367 | } | |
368 | } | |
369 | ||
370 | reset() | |
371 | { | |
372 | longjmp(sjbuf, 1); | |
373 | } |