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f6227721 | 1 | #ifndef lint |
57005db7 | 2 | static char sccsid[] = "@(#)service.c 4.4 %G%"; |
f6227721 | 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[]; | |
57005db7 | 23 | INT num_sysmsg; |
852d162d KM |
24 | |
25 | /* fault handling */ | |
26 | #define ENOMEM 12 | |
27 | #define ENOEXEC 8 | |
28 | #define E2BIG 7 | |
29 | #define ENOENT 2 | |
30 | #define ETXTBSY 26 | |
31 | ||
32 | ||
33 | ||
34 | /* service routines for `execute' */ | |
35 | ||
36 | VOID initio(iop) | |
37 | IOPTR iop; | |
38 | { | |
39 | REG STRING ion; | |
40 | REG INT iof, fd; | |
41 | ||
42 | IF iop | |
43 | THEN iof=iop->iofile; | |
44 | ion=mactrim(iop->ioname); | |
45 | IF *ion ANDF (flags&noexec)==0 | |
46 | THEN IF iof&IODOC | |
47 | THEN subst(chkopen(ion),(fd=tmpfil())); | |
48 | close(fd); fd=chkopen(tmpout); unlink(tmpout); | |
49 | ELIF iof&IOMOV | |
50 | THEN IF eq(minus,ion) | |
51 | THEN fd = -1; | |
52 | close(iof&IOUFD); | |
53 | ELIF (fd=stoi(ion))>=USERIO | |
54 | THEN failed(ion,badfile); | |
55 | ELSE fd=dup(fd); | |
56 | FI | |
57 | ELIF (iof&IOPUT)==0 | |
58 | THEN fd=chkopen(ion); | |
59 | ELIF flags&rshflg | |
60 | THEN failed(ion,restricted); | |
61 | ELIF iof&IOAPP ANDF (fd=open(ion,1))>=0 | |
62 | THEN lseek(fd, 0L, 2); | |
63 | ELSE fd=create(ion); | |
64 | FI | |
65 | IF fd>=0 | |
66 | THEN rename(fd,iof&IOUFD); | |
67 | FI | |
68 | FI | |
69 | initio(iop->ionxt); | |
70 | FI | |
71 | } | |
72 | ||
73 | STRING getpath(s) | |
74 | STRING s; | |
75 | { | |
76 | REG STRING path; | |
77 | IF any('/',s) | |
78 | THEN IF flags&rshflg | |
79 | THEN failed(s, restricted); | |
80 | ELSE return(nullstr); | |
81 | FI | |
82 | ELIF (path = pathnod.namval)==0 | |
83 | THEN return(defpath); | |
84 | ELSE return(cpystak(path)); | |
85 | FI | |
86 | } | |
87 | ||
88 | INT pathopen(path, name) | |
89 | REG STRING path, name; | |
90 | { | |
91 | REG UFD f; | |
92 | ||
93 | REP path=catpath(path,name); | |
94 | PER (f=open(curstak(),0))<0 ANDF path DONE | |
95 | return(f); | |
96 | } | |
97 | ||
98 | STRING catpath(path,name) | |
99 | REG STRING path; | |
100 | STRING name; | |
101 | { | |
102 | /* leaves result on top of stack */ | |
103 | REG STRING scanp = path, | |
104 | argp = locstak(); | |
105 | ||
106 | WHILE *scanp ANDF *scanp!=COLON DO *argp++ = *scanp++ OD | |
107 | IF scanp!=path THEN *argp++='/' FI | |
108 | IF *scanp==COLON THEN scanp++ FI | |
109 | path=(*scanp ? scanp : 0); scanp=name; | |
110 | WHILE (*argp++ = *scanp++) DONE | |
111 | return(path); | |
112 | } | |
113 | ||
114 | LOCAL STRING xecmsg; | |
115 | LOCAL STRING *xecenv; | |
116 | ||
117 | VOID execa(at) | |
118 | STRING at[]; | |
119 | { | |
120 | REG STRING path; | |
121 | REG STRING *t = at; | |
122 | ||
123 | IF (flags&noexec)==0 | |
124 | THEN xecmsg=notfound; path=getpath(*t); | |
125 | namscan(exname); | |
126 | xecenv=setenv(); | |
127 | WHILE path=execs(path,t) DONE | |
128 | failed(*t,xecmsg); | |
129 | FI | |
130 | } | |
131 | ||
132 | LOCAL STRING execs(ap,t) | |
133 | STRING ap; | |
134 | REG STRING t[]; | |
135 | { | |
136 | REG STRING p, prefix; | |
137 | ||
138 | prefix=catpath(ap,t[0]); | |
139 | trim(p=curstak()); | |
140 | ||
141 | sigchk(); | |
142 | execve(p, &t[0] ,xecenv); | |
143 | SWITCH errno IN | |
144 | ||
145 | case ENOEXEC: | |
146 | flags=0; | |
147 | comdiv=0; ioset=0; | |
148 | clearup(); /* remove open files and for loop junk */ | |
149 | IF input THEN close(input) FI | |
150 | close(output); output=2; | |
151 | input=chkopen(p); | |
152 | ||
153 | /* band aid to get csh... 2/26/79 */ | |
154 | { | |
155 | char c; | |
156 | if (!isatty(input)) { | |
157 | read(input, &c, 1); | |
158 | if (c == '#') | |
159 | gocsh(t, p, xecenv); | |
160 | lseek(input, (long) 0, 0); | |
161 | } | |
162 | } | |
163 | ||
164 | /* set up new args */ | |
165 | setargs(t); | |
166 | longjmp(subshell,1); | |
167 | ||
168 | case ENOMEM: | |
169 | failed(p,toobig); | |
170 | ||
171 | case E2BIG: | |
172 | failed(p,arglist); | |
173 | ||
174 | case ETXTBSY: | |
175 | failed(p,txtbsy); | |
176 | ||
177 | default: | |
178 | xecmsg=badexec; | |
179 | case ENOENT: | |
180 | return(prefix); | |
181 | ENDSW | |
182 | } | |
183 | ||
184 | gocsh(t, cp, xecenv) | |
185 | register char **t, *cp, **xecenv; | |
186 | { | |
187 | char **newt[1000]; | |
188 | register char **p; | |
189 | register int i; | |
190 | ||
191 | for (i = 0; t[i]; i++) | |
192 | newt[i+1] = t[i]; | |
193 | newt[i+1] = 0; | |
194 | newt[0] = "/bin/csh"; | |
195 | newt[1] = cp; | |
196 | execve("/bin/csh", newt, xecenv); | |
197 | } | |
198 | ||
199 | /* for processes to be waited for */ | |
200 | #define MAXP 20 | |
201 | LOCAL INT pwlist[MAXP]; | |
202 | LOCAL INT pwc; | |
203 | ||
204 | postclr() | |
205 | { | |
206 | REG INT *pw = pwlist; | |
207 | ||
208 | WHILE pw <= &pwlist[pwc] | |
209 | DO *pw++ = 0 OD | |
210 | pwc=0; | |
211 | } | |
212 | ||
213 | VOID post(pcsid) | |
214 | INT pcsid; | |
215 | { | |
216 | REG INT *pw = pwlist; | |
217 | ||
218 | IF pcsid | |
219 | THEN WHILE *pw DO pw++ OD | |
220 | IF pwc >= MAXP-1 | |
221 | THEN pw--; | |
222 | ELSE pwc++; | |
223 | FI | |
224 | *pw = pcsid; | |
225 | FI | |
226 | } | |
227 | ||
228 | VOID await(i) | |
229 | INT i; | |
230 | { | |
231 | INT rc=0, wx=0; | |
232 | INT w; | |
233 | INT ipwc = pwc; | |
234 | ||
235 | post(i); | |
236 | WHILE pwc | |
237 | DO REG INT p; | |
238 | REG INT sig; | |
239 | INT w_hi; | |
240 | ||
241 | BEGIN | |
242 | REG INT *pw=pwlist; | |
c7cde447 KM |
243 | IF setjmp(INTbuf) == 0 |
244 | THEN trapjmp[INTR] = 1; p=wait(&w); | |
245 | ELSE p = -1; | |
246 | FI | |
247 | trapjmp[INTR] = 0; | |
852d162d KM |
248 | WHILE pw <= &pwlist[ipwc] |
249 | DO IF *pw==p | |
250 | THEN *pw=0; pwc--; | |
251 | ELSE pw++; | |
252 | FI | |
253 | OD | |
254 | END | |
255 | ||
256 | IF p == -1 THEN continue FI | |
257 | ||
258 | w_hi = (w>>8)&LOBYTE; | |
259 | ||
260 | IF sig = w&0177 | |
261 | THEN IF sig == 0177 /* ptrace! return */ | |
262 | THEN prs("ptrace: "); | |
263 | sig = w_hi; | |
264 | FI | |
57005db7 KM |
265 | IF sig < num_sysmsg ANDF sysmsg[sig] |
266 | THEN IF i!=p ORF (flags&prompt)==0 | |
267 | THEN prp(); prn(p); blank() | |
268 | FI | |
852d162d KM |
269 | prs(sysmsg[sig]); |
270 | IF w&0200 THEN prs(coredump) FI | |
271 | FI | |
272 | newline(); | |
273 | FI | |
274 | ||
275 | IF rc==0 | |
276 | THEN rc = (sig ? sig|SIGFLG : w_hi); | |
277 | FI | |
278 | wx |= w; | |
279 | OD | |
280 | ||
281 | IF wx ANDF flags&errflg | |
282 | THEN exitsh(rc); | |
283 | FI | |
284 | exitval=rc; exitset(); | |
285 | } | |
286 | ||
287 | BOOL nosubst; | |
288 | ||
289 | trim(at) | |
290 | STRING at; | |
291 | { | |
292 | REG STRING p; | |
293 | REG CHAR c; | |
294 | REG CHAR q=0; | |
295 | ||
296 | IF p=at | |
297 | THEN WHILE c = *p | |
298 | DO *p++=c&STRIP; q |= c OD | |
299 | FI | |
300 | nosubst=q"E; | |
301 | } | |
302 | ||
303 | STRING mactrim(s) | |
304 | STRING s; | |
305 | { | |
306 | REG STRING t=macro(s); | |
307 | trim(t); | |
308 | return(t); | |
309 | } | |
310 | ||
311 | STRING *scan(argn) | |
312 | INT argn; | |
313 | { | |
314 | REG ARGPTR argp = Rcheat(gchain)&~ARGMK; | |
315 | REG STRING *comargn, *comargm; | |
316 | ||
317 | comargn=getstak(BYTESPERWORD*argn+BYTESPERWORD); comargm = comargn += argn; *comargn = ENDARGS; | |
318 | ||
319 | WHILE argp | |
320 | DO *--comargn = argp->argval; | |
321 | IF argp = argp->argnxt | |
322 | THEN trim(*comargn); | |
323 | FI | |
324 | IF argp==0 ORF Rcheat(argp)&ARGMK | |
325 | THEN gsort(comargn,comargm); | |
326 | comargm = comargn; | |
327 | FI | |
328 | /* Lcheat(argp) &= ~ARGMK; */ | |
329 | argp = Rcheat(argp)&~ARGMK; | |
330 | OD | |
331 | return(comargn); | |
332 | } | |
333 | ||
334 | LOCAL VOID gsort(from,to) | |
335 | STRING from[], to[]; | |
336 | { | |
337 | INT k, m, n; | |
338 | REG INT i, j; | |
339 | ||
340 | IF (n=to-from)<=1 THEN return FI | |
341 | ||
342 | FOR j=1; j<=n; j*=2 DONE | |
343 | ||
344 | FOR m=2*j-1; m/=2; | |
345 | DO k=n-m; | |
346 | FOR j=0; j<k; j++ | |
347 | DO FOR i=j; i>=0; i-=m | |
348 | DO REG STRING *fromi; fromi = &from[i]; | |
349 | IF cf(fromi[m],fromi[0])>0 | |
350 | THEN break; | |
351 | ELSE STRING s; s=fromi[m]; fromi[m]=fromi[0]; fromi[0]=s; | |
352 | FI | |
353 | OD | |
354 | OD | |
355 | OD | |
356 | } | |
357 | ||
358 | /* Argument list generation */ | |
359 | ||
360 | INT getarg(ac) | |
361 | COMPTR ac; | |
362 | { | |
363 | REG ARGPTR argp; | |
364 | REG INT count=0; | |
365 | REG COMPTR c; | |
366 | ||
367 | IF c=ac | |
368 | THEN argp=c->comarg; | |
369 | WHILE argp | |
370 | DO count += split(macro(argp->argval)); | |
371 | argp=argp->argnxt; | |
372 | OD | |
373 | FI | |
374 | return(count); | |
375 | } | |
376 | ||
377 | LOCAL INT split(s) | |
378 | REG STRING s; | |
379 | { | |
380 | REG STRING argp; | |
381 | REG INT c; | |
382 | INT count=0; | |
383 | ||
384 | LOOP sigchk(); argp=locstak()+BYTESPERWORD; | |
385 | WHILE (c = *s++, !any(c,ifsnod.namval) && c) | |
386 | DO *argp++ = c OD | |
387 | IF argp==staktop+BYTESPERWORD | |
388 | THEN IF c | |
389 | THEN continue; | |
390 | ELSE return(count); | |
391 | FI | |
392 | ELIF c==0 | |
393 | THEN s--; | |
394 | FI | |
395 | IF c=expand((argp=endstak(argp))->argval,0) | |
396 | THEN count += c; | |
397 | ELSE /* assign(&fngnod, argp->argval); */ | |
398 | makearg(argp); count++; | |
399 | FI | |
400 | Lcheat(gchain) |= ARGMK; | |
401 | POOL | |
402 | } |