| 1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)service.c 4.2 %G%"; |
| 3 | #endif |
| 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 | } |