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f6227721 SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)service.c 4.2 %G%"; | |
3 | #endif | |
852d162d KM |
4 | |
5 | # | |
6 | /* | |
7 | * UNIX shell | |
8 | * | |
9 | * S. R. Bourne | |
10 | * Bell Telephone Laboratories | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "defs.h" | |
15 | ||
16 | ||
17 | PROC VOID gsort(); | |
18 | ||
19 | #define ARGMK 01 | |
20 | ||
21 | INT errno; | |
22 | STRING sysmsg[]; | |
23 | ||
24 | /* fault handling */ | |
25 | #define ENOMEM 12 | |
26 | #define ENOEXEC 8 | |
27 | #define E2BIG 7 | |
28 | #define ENOENT 2 | |
29 | #define ETXTBSY 26 | |
30 | ||
31 | ||
32 | ||
33 | /* service routines for `execute' */ | |
34 | ||
35 | VOID initio(iop) | |
36 | IOPTR iop; | |
37 | { | |
38 | REG STRING ion; | |
39 | REG INT iof, fd; | |
40 | ||
41 | IF iop | |
42 | THEN iof=iop->iofile; | |
43 | ion=mactrim(iop->ioname); | |
44 | IF *ion ANDF (flags&noexec)==0 | |
45 | THEN IF iof&IODOC | |
46 | THEN subst(chkopen(ion),(fd=tmpfil())); | |
47 | close(fd); fd=chkopen(tmpout); unlink(tmpout); | |
48 | ELIF iof&IOMOV | |
49 | THEN IF eq(minus,ion) | |
50 | THEN fd = -1; | |
51 | close(iof&IOUFD); | |
52 | ELIF (fd=stoi(ion))>=USERIO | |
53 | THEN failed(ion,badfile); | |
54 | ELSE fd=dup(fd); | |
55 | FI | |
56 | ELIF (iof&IOPUT)==0 | |
57 | THEN fd=chkopen(ion); | |
58 | ELIF flags&rshflg | |
59 | THEN failed(ion,restricted); | |
60 | ELIF iof&IOAPP ANDF (fd=open(ion,1))>=0 | |
61 | THEN lseek(fd, 0L, 2); | |
62 | ELSE fd=create(ion); | |
63 | FI | |
64 | IF fd>=0 | |
65 | THEN rename(fd,iof&IOUFD); | |
66 | FI | |
67 | FI | |
68 | initio(iop->ionxt); | |
69 | FI | |
70 | } | |
71 | ||
72 | STRING getpath(s) | |
73 | STRING s; | |
74 | { | |
75 | REG STRING path; | |
76 | IF any('/',s) | |
77 | THEN IF flags&rshflg | |
78 | THEN failed(s, restricted); | |
79 | ELSE return(nullstr); | |
80 | FI | |
81 | ELIF (path = pathnod.namval)==0 | |
82 | THEN return(defpath); | |
83 | ELSE return(cpystak(path)); | |
84 | FI | |
85 | } | |
86 | ||
87 | INT pathopen(path, name) | |
88 | REG STRING path, name; | |
89 | { | |
90 | REG UFD f; | |
91 | ||
92 | REP path=catpath(path,name); | |
93 | PER (f=open(curstak(),0))<0 ANDF path DONE | |
94 | return(f); | |
95 | } | |
96 | ||
97 | STRING catpath(path,name) | |
98 | REG STRING path; | |
99 | STRING name; | |
100 | { | |
101 | /* leaves result on top of stack */ | |
102 | REG STRING scanp = path, | |
103 | argp = locstak(); | |
104 | ||
105 | WHILE *scanp ANDF *scanp!=COLON DO *argp++ = *scanp++ OD | |
106 | IF scanp!=path THEN *argp++='/' FI | |
107 | IF *scanp==COLON THEN scanp++ FI | |
108 | path=(*scanp ? scanp : 0); scanp=name; | |
109 | WHILE (*argp++ = *scanp++) DONE | |
110 | return(path); | |
111 | } | |
112 | ||
113 | LOCAL STRING xecmsg; | |
114 | LOCAL STRING *xecenv; | |
115 | ||
116 | VOID execa(at) | |
117 | STRING at[]; | |
118 | { | |
119 | REG STRING path; | |
120 | REG STRING *t = at; | |
121 | ||
122 | IF (flags&noexec)==0 | |
123 | THEN xecmsg=notfound; path=getpath(*t); | |
124 | namscan(exname); | |
125 | xecenv=setenv(); | |
126 | WHILE path=execs(path,t) DONE | |
127 | failed(*t,xecmsg); | |
128 | FI | |
129 | } | |
130 | ||
131 | LOCAL STRING execs(ap,t) | |
132 | STRING ap; | |
133 | REG STRING t[]; | |
134 | { | |
135 | REG STRING p, prefix; | |
136 | ||
137 | prefix=catpath(ap,t[0]); | |
138 | trim(p=curstak()); | |
139 | ||
140 | sigchk(); | |
141 | execve(p, &t[0] ,xecenv); | |
142 | SWITCH errno IN | |
143 | ||
144 | case ENOEXEC: | |
145 | flags=0; | |
146 | comdiv=0; ioset=0; | |
147 | clearup(); /* remove open files and for loop junk */ | |
148 | IF input THEN close(input) FI | |
149 | close(output); output=2; | |
150 | input=chkopen(p); | |
151 | ||
152 | /* band aid to get csh... 2/26/79 */ | |
153 | { | |
154 | char c; | |
155 | if (!isatty(input)) { | |
156 | read(input, &c, 1); | |
157 | if (c == '#') | |
158 | gocsh(t, p, xecenv); | |
159 | lseek(input, (long) 0, 0); | |
160 | } | |
161 | } | |
162 | ||
163 | /* set up new args */ | |
164 | setargs(t); | |
165 | longjmp(subshell,1); | |
166 | ||
167 | case ENOMEM: | |
168 | failed(p,toobig); | |
169 | ||
170 | case E2BIG: | |
171 | failed(p,arglist); | |
172 | ||
173 | case ETXTBSY: | |
174 | failed(p,txtbsy); | |
175 | ||
176 | default: | |
177 | xecmsg=badexec; | |
178 | case ENOENT: | |
179 | return(prefix); | |
180 | ENDSW | |
181 | } | |
182 | ||
183 | gocsh(t, cp, xecenv) | |
184 | register char **t, *cp, **xecenv; | |
185 | { | |
186 | char **newt[1000]; | |
187 | register char **p; | |
188 | register int i; | |
189 | ||
190 | for (i = 0; t[i]; i++) | |
191 | newt[i+1] = t[i]; | |
192 | newt[i+1] = 0; | |
193 | newt[0] = "/bin/csh"; | |
194 | newt[1] = cp; | |
195 | execve("/bin/csh", newt, xecenv); | |
196 | } | |
197 | ||
198 | /* for processes to be waited for */ | |
199 | #define MAXP 20 | |
200 | LOCAL INT pwlist[MAXP]; | |
201 | LOCAL INT pwc; | |
202 | ||
203 | postclr() | |
204 | { | |
205 | REG INT *pw = pwlist; | |
206 | ||
207 | WHILE pw <= &pwlist[pwc] | |
208 | DO *pw++ = 0 OD | |
209 | pwc=0; | |
210 | } | |
211 | ||
212 | VOID post(pcsid) | |
213 | INT pcsid; | |
214 | { | |
215 | REG INT *pw = pwlist; | |
216 | ||
217 | IF pcsid | |
218 | THEN WHILE *pw DO pw++ OD | |
219 | IF pwc >= MAXP-1 | |
220 | THEN pw--; | |
221 | ELSE pwc++; | |
222 | FI | |
223 | *pw = pcsid; | |
224 | FI | |
225 | } | |
226 | ||
227 | VOID await(i) | |
228 | INT i; | |
229 | { | |
230 | INT rc=0, wx=0; | |
231 | INT w; | |
232 | INT ipwc = pwc; | |
233 | ||
234 | post(i); | |
235 | WHILE pwc | |
236 | DO REG INT p; | |
237 | REG INT sig; | |
238 | INT w_hi; | |
239 | ||
240 | BEGIN | |
241 | REG INT *pw=pwlist; | |
242 | p=wait(&w); | |
243 | WHILE pw <= &pwlist[ipwc] | |
244 | DO IF *pw==p | |
245 | THEN *pw=0; pwc--; | |
246 | ELSE pw++; | |
247 | FI | |
248 | OD | |
249 | END | |
250 | ||
251 | IF p == -1 THEN continue FI | |
252 | ||
253 | w_hi = (w>>8)&LOBYTE; | |
254 | ||
255 | IF sig = w&0177 | |
256 | THEN IF sig == 0177 /* ptrace! return */ | |
257 | THEN prs("ptrace: "); | |
258 | sig = w_hi; | |
259 | FI | |
260 | IF sysmsg[sig] | |
261 | THEN IF i!=p ORF (flags&prompt)==0 THEN prp(); prn(p); blank() FI | |
262 | prs(sysmsg[sig]); | |
263 | IF w&0200 THEN prs(coredump) FI | |
264 | FI | |
265 | newline(); | |
266 | FI | |
267 | ||
268 | IF rc==0 | |
269 | THEN rc = (sig ? sig|SIGFLG : w_hi); | |
270 | FI | |
271 | wx |= w; | |
272 | OD | |
273 | ||
274 | IF wx ANDF flags&errflg | |
275 | THEN exitsh(rc); | |
276 | FI | |
277 | exitval=rc; exitset(); | |
278 | } | |
279 | ||
280 | BOOL nosubst; | |
281 | ||
282 | trim(at) | |
283 | STRING at; | |
284 | { | |
285 | REG STRING p; | |
286 | REG CHAR c; | |
287 | REG CHAR q=0; | |
288 | ||
289 | IF p=at | |
290 | THEN WHILE c = *p | |
291 | DO *p++=c&STRIP; q |= c OD | |
292 | FI | |
293 | nosubst=q"E; | |
294 | } | |
295 | ||
296 | STRING mactrim(s) | |
297 | STRING s; | |
298 | { | |
299 | REG STRING t=macro(s); | |
300 | trim(t); | |
301 | return(t); | |
302 | } | |
303 | ||
304 | STRING *scan(argn) | |
305 | INT argn; | |
306 | { | |
307 | REG ARGPTR argp = Rcheat(gchain)&~ARGMK; | |
308 | REG STRING *comargn, *comargm; | |
309 | ||
310 | comargn=getstak(BYTESPERWORD*argn+BYTESPERWORD); comargm = comargn += argn; *comargn = ENDARGS; | |
311 | ||
312 | WHILE argp | |
313 | DO *--comargn = argp->argval; | |
314 | IF argp = argp->argnxt | |
315 | THEN trim(*comargn); | |
316 | FI | |
317 | IF argp==0 ORF Rcheat(argp)&ARGMK | |
318 | THEN gsort(comargn,comargm); | |
319 | comargm = comargn; | |
320 | FI | |
321 | /* Lcheat(argp) &= ~ARGMK; */ | |
322 | argp = Rcheat(argp)&~ARGMK; | |
323 | OD | |
324 | return(comargn); | |
325 | } | |
326 | ||
327 | LOCAL VOID gsort(from,to) | |
328 | STRING from[], to[]; | |
329 | { | |
330 | INT k, m, n; | |
331 | REG INT i, j; | |
332 | ||
333 | IF (n=to-from)<=1 THEN return FI | |
334 | ||
335 | FOR j=1; j<=n; j*=2 DONE | |
336 | ||
337 | FOR m=2*j-1; m/=2; | |
338 | DO k=n-m; | |
339 | FOR j=0; j<k; j++ | |
340 | DO FOR i=j; i>=0; i-=m | |
341 | DO REG STRING *fromi; fromi = &from[i]; | |
342 | IF cf(fromi[m],fromi[0])>0 | |
343 | THEN break; | |
344 | ELSE STRING s; s=fromi[m]; fromi[m]=fromi[0]; fromi[0]=s; | |
345 | FI | |
346 | OD | |
347 | OD | |
348 | OD | |
349 | } | |
350 | ||
351 | /* Argument list generation */ | |
352 | ||
353 | INT getarg(ac) | |
354 | COMPTR ac; | |
355 | { | |
356 | REG ARGPTR argp; | |
357 | REG INT count=0; | |
358 | REG COMPTR c; | |
359 | ||
360 | IF c=ac | |
361 | THEN argp=c->comarg; | |
362 | WHILE argp | |
363 | DO count += split(macro(argp->argval)); | |
364 | argp=argp->argnxt; | |
365 | OD | |
366 | FI | |
367 | return(count); | |
368 | } | |
369 | ||
370 | LOCAL INT split(s) | |
371 | REG STRING s; | |
372 | { | |
373 | REG STRING argp; | |
374 | REG INT c; | |
375 | INT count=0; | |
376 | ||
377 | LOOP sigchk(); argp=locstak()+BYTESPERWORD; | |
378 | WHILE (c = *s++, !any(c,ifsnod.namval) && c) | |
379 | DO *argp++ = c OD | |
380 | IF argp==staktop+BYTESPERWORD | |
381 | THEN IF c | |
382 | THEN continue; | |
383 | ELSE return(count); | |
384 | FI | |
385 | ELIF c==0 | |
386 | THEN s--; | |
387 | FI | |
388 | IF c=expand((argp=endstak(argp))->argval,0) | |
389 | THEN count += c; | |
390 | ELSE /* assign(&fngnod, argp->argval); */ | |
391 | makearg(argp); count++; | |
392 | FI | |
393 | Lcheat(gchain) |= ARGMK; | |
394 | POOL | |
395 | } |