Commit | Line | Data |
---|---|---|
7c8ab0e6 BJ |
1 | static char *sccsid = "@(#)init.c 4.1 (Berkeley) %G%"; |
2 | #include <signal.h> | |
3 | #include <sys/types.h> | |
4 | #include <utmp.h> | |
5 | #include <setjmp.h> | |
6 | ||
7 | #define LINSIZ sizeof(wtmp.ut_line) | |
8 | #define TABSIZ 100 | |
9 | #define ALL p = &itab[0]; p < &itab[TABSIZ]; p++ | |
10 | #define EVER ;; | |
11 | #define SCPYN(a, b) strncpy(a, b, sizeof(a)) | |
12 | #define SCMPN(a, b) strncmp(a, b, sizeof(a)) | |
13 | ||
14 | char shell[] = "/bin/sh"; | |
15 | char getty[] = "/etc/getty.vm"; | |
16 | char minus[] = "-"; | |
17 | char runc[] = "/etc/rc"; | |
18 | char ifile[] = "/etc/ttys"; | |
19 | char utmp[] = "/etc/utmp"; | |
20 | char wtmpf[] = "/usr/adm/wtmp"; | |
21 | char ctty[] = "/dev/console"; | |
22 | char dev[] = "/dev/"; | |
23 | ||
24 | struct utmp wtmp; | |
25 | struct | |
26 | { | |
27 | char line[LINSIZ]; | |
28 | char comn; | |
29 | char flag; | |
30 | } line; | |
31 | struct tab | |
32 | { | |
33 | char line[LINSIZ]; | |
34 | char comn; | |
35 | char xflag; | |
36 | int pid; | |
37 | } itab[TABSIZ]; | |
38 | ||
39 | int fi; | |
40 | int mergflag; | |
41 | char tty[20]; | |
42 | jmp_buf sjbuf; | |
43 | ||
44 | int reset(); | |
45 | char *strcpy(), *strcat(); | |
46 | long lseek(); | |
47 | ||
48 | main() | |
49 | { | |
50 | setjmp(sjbuf); | |
51 | signal(SIGTERM, reset); | |
52 | signal(SIGSTOP, SIG_IGN); | |
53 | signal(SIGTSTP, SIG_IGN); | |
54 | signal(SIGTTIN, SIG_IGN); | |
55 | signal(SIGTTOU, SIG_IGN); | |
56 | for(EVER) { | |
57 | shutdown(); | |
58 | single(); | |
59 | runcom(); | |
60 | merge(); | |
61 | multiple(); | |
62 | } | |
63 | } | |
64 | ||
65 | shutdown() | |
66 | { | |
67 | register i; | |
68 | register struct tab *p; | |
69 | ||
70 | close(creat(utmp, 0644)); | |
71 | signal(SIGHUP, SIG_IGN); | |
72 | for(ALL) { | |
73 | term(p); | |
74 | p->line[0] = 0; | |
75 | } | |
76 | signal(SIGALRM, reset); | |
77 | alarm(60); | |
78 | for(i=0; i<5; i++) | |
79 | kill(-1, SIGKILL); | |
80 | while(wait((int *)0) != -1) | |
81 | ; | |
82 | alarm(0); | |
83 | signal(SIGALRM, SIG_DFL); | |
84 | for(i=0; i<10; i++) | |
85 | close(i); | |
86 | } | |
87 | ||
88 | single() | |
89 | { | |
90 | register pid; | |
91 | ||
92 | pid = fork(); | |
93 | if(pid == 0) { | |
94 | /* | |
95 | alarm(300); | |
96 | */ | |
97 | signal(SIGTERM, SIG_DFL); | |
98 | signal(SIGHUP, SIG_DFL); | |
99 | signal(SIGALRM, SIG_DFL); | |
100 | open(ctty, 2); | |
101 | dup(0); | |
102 | dup(0); | |
103 | execl(shell, minus, (char *)0); | |
104 | exit(0); | |
105 | } | |
106 | while(wait((int *)0) != pid) | |
107 | ; | |
108 | } | |
109 | ||
110 | runcom() | |
111 | { | |
112 | register pid, f; | |
113 | ||
114 | pid = fork(); | |
115 | if(pid == 0) { | |
116 | open("/", 0); | |
117 | dup(0); | |
118 | dup(0); | |
119 | execl(shell, shell, runc, (char *)0); | |
120 | exit(0); | |
121 | } | |
122 | while(wait((int *)0) != pid) | |
123 | ; | |
124 | f = open(wtmpf, 1); | |
125 | if (f >= 0) { | |
126 | lseek(f, 0L, 2); | |
127 | SCPYN(wtmp.ut_line, "~"); | |
128 | SCPYN(wtmp.ut_name, "reboot"); | |
129 | time(&wtmp.ut_time); | |
130 | write(f, (char *)&wtmp, sizeof(wtmp)); | |
131 | close(f); | |
132 | } | |
133 | } | |
134 | ||
135 | setmerge() | |
136 | { | |
137 | ||
138 | signal(SIGHUP, setmerge); | |
139 | mergflag = 1; | |
140 | } | |
141 | ||
142 | multiple() | |
143 | { | |
144 | register struct tab *p; | |
145 | register pid; | |
146 | ||
147 | loop: | |
148 | mergflag = 0; | |
149 | signal(SIGHUP, setmerge); | |
150 | for(EVER) { | |
151 | pid = wait((int *)0); | |
152 | if(mergflag) { | |
153 | merge(); | |
154 | goto loop; | |
155 | } | |
156 | if(pid == -1) | |
157 | return; | |
158 | for(ALL) | |
159 | if(p->pid == pid || p->pid == -1) { | |
160 | rmut(p); | |
161 | dfork(p); | |
162 | } | |
163 | } | |
164 | } | |
165 | ||
166 | term(p) | |
167 | register struct tab *p; | |
168 | { | |
169 | ||
170 | if(p->pid != 0) { | |
171 | rmut(p); | |
172 | kill(p->pid, SIGKILL); | |
173 | } | |
174 | p->pid = 0; | |
175 | } | |
176 | ||
177 | rline() | |
178 | { | |
179 | register c, i; | |
180 | ||
181 | loop: | |
182 | c = get(); | |
183 | if(c < 0) | |
184 | return(0); | |
185 | if(c == 0) | |
186 | goto loop; | |
187 | line.flag = c; | |
188 | c = get(); | |
189 | if(c <= 0) | |
190 | goto loop; | |
191 | line.comn = c; | |
192 | SCPYN(line.line, ""); | |
193 | for (i=0; i<LINSIZ; i++) { | |
194 | c = get(); | |
195 | if(c <= 0) | |
196 | break; | |
197 | line.line[i] = c; | |
198 | } | |
199 | while(c > 0) | |
200 | c = get(); | |
201 | if(line.line[0] == 0) | |
202 | goto loop; | |
203 | if(line.flag == '0') | |
204 | goto loop; | |
205 | strcpy(tty, dev); | |
206 | strncat(tty, line.line, LINSIZ); | |
207 | if(access(tty, 06) < 0) | |
208 | goto loop; | |
209 | return(1); | |
210 | } | |
211 | ||
212 | get() | |
213 | { | |
214 | char b; | |
215 | ||
216 | if(read(fi, &b, 1) != 1) | |
217 | return(-1); | |
218 | if(b == '\n') | |
219 | return(0); | |
220 | return(b); | |
221 | } | |
222 | ||
223 | #define FOUND 1 | |
224 | #define CHANGE 2 | |
225 | ||
226 | merge() | |
227 | { | |
228 | register struct tab *p; | |
229 | ||
230 | fi = open(ifile, 0); | |
231 | if(fi < 0) | |
232 | return; | |
233 | for(ALL) | |
234 | p->xflag = 0; | |
235 | while(rline()) { | |
236 | for(ALL) { | |
237 | if (SCMPN(p->line, line.line)) | |
238 | continue; | |
239 | p->xflag |= FOUND; | |
240 | if(line.comn != p->comn) { | |
241 | p->xflag |= CHANGE; | |
242 | p->comn = line.comn; | |
243 | } | |
244 | goto contin1; | |
245 | } | |
246 | for(ALL) { | |
247 | if(p->line[0] != 0) | |
248 | continue; | |
249 | SCPYN(p->line, line.line); | |
250 | p->xflag |= FOUND|CHANGE; | |
251 | p->comn = line.comn; | |
252 | goto contin1; | |
253 | } | |
254 | contin1: | |
255 | ; | |
256 | } | |
257 | close(fi); | |
258 | for(ALL) { | |
259 | if((p->xflag&FOUND) == 0) { | |
260 | term(p); | |
261 | p->line[0] = 0; | |
262 | } | |
263 | if((p->xflag&CHANGE) != 0) { | |
264 | term(p); | |
265 | dfork(p); | |
266 | } | |
267 | } | |
268 | } | |
269 | ||
270 | dfork(p) | |
271 | struct tab *p; | |
272 | { | |
273 | register pid; | |
274 | ||
275 | pid = fork(); | |
276 | if(pid == 0) { | |
277 | signal(SIGTERM, SIG_DFL); | |
278 | signal(SIGHUP, SIG_IGN); | |
279 | strcpy(tty, dev); | |
280 | strncat(tty, p->line, LINSIZ); | |
281 | chown(tty, 0, 0); | |
282 | chmod(tty, 0622); | |
283 | open(tty, 2); | |
284 | vhangup(); | |
285 | signal(SIGHUP, SIG_DFL); | |
286 | open(tty, 2); | |
287 | close(0); | |
288 | dup(1); | |
289 | dup(0); | |
290 | tty[0] = p->comn; | |
291 | tty[1] = 0; | |
292 | execl(getty, minus, tty, (char *)0); | |
293 | exit(0); | |
294 | } | |
295 | p->pid = pid; | |
296 | } | |
297 | ||
298 | rmut(p) | |
299 | register struct tab *p; | |
300 | { | |
301 | register f; | |
302 | ||
303 | f = open(utmp, 2); | |
304 | if(f >= 0) { | |
305 | while(read(f, (char *)&wtmp, sizeof(wtmp)) == sizeof(wtmp)) { | |
306 | if (SCMPN(wtmp.ut_line, p->line)) | |
307 | continue; | |
308 | lseek(f, -(long)sizeof(wtmp), 1); | |
309 | SCPYN(wtmp.ut_name, ""); | |
310 | time(&wtmp.ut_time); | |
311 | write(f, (char *)&wtmp, sizeof(wtmp)); | |
312 | } | |
313 | close(f); | |
314 | } | |
315 | f = open(wtmpf, 1); | |
316 | if (f >= 0) { | |
317 | SCPYN(wtmp.ut_line, p->line); | |
318 | SCPYN(wtmp.ut_name, ""); | |
319 | time(&wtmp.ut_time); | |
320 | lseek(f, (long)0, 2); | |
321 | write(f, (char *)&wtmp, sizeof(wtmp)); | |
322 | close(f); | |
323 | } | |
324 | } | |
325 | ||
326 | reset() | |
327 | { | |
328 | longjmp(sjbuf, 1); | |
329 | } | |
330 | ||
331 |