Commit | Line | Data |
---|---|---|
7eeaac77 | 1 | /* kern_proc.c 4.3 %G% */ |
29dd101b BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/map.h" | |
6 | #include "../h/mtpr.h" | |
7 | #include "../h/dir.h" | |
8 | #include "../h/user.h" | |
9 | #include "../h/proc.h" | |
10 | #include "../h/buf.h" | |
11 | #include "../h/reg.h" | |
12 | #include "../h/inode.h" | |
13 | #include "../h/seg.h" | |
14 | #include "../h/acct.h" | |
8643403f | 15 | #include "/usr/include/wait.h" |
29dd101b BJ |
16 | #include "../h/pte.h" |
17 | #include "../h/vm.h" | |
18 | #include "../h/text.h" | |
bdfe5b0f | 19 | #include "../h/psl.h" |
b07c4d64 | 20 | #include "../h/vlimit.h" |
3ca1542b | 21 | #include "../h/file.h" |
29dd101b BJ |
22 | |
23 | /* | |
24 | * exec system call, with and without environments. | |
25 | */ | |
26 | struct execa { | |
27 | char *fname; | |
28 | char **argp; | |
29 | char **envp; | |
30 | }; | |
31 | ||
32 | exec() | |
33 | { | |
34 | ((struct execa *)u.u_ap)->envp = NULL; | |
35 | exece(); | |
36 | } | |
37 | ||
38 | exece() | |
39 | { | |
40 | register nc; | |
41 | register char *cp; | |
42 | register struct buf *bp; | |
43 | register struct execa *uap; | |
44 | int na, ne, ucp, ap, c; | |
7eeaac77 RE |
45 | int indir, uid, gid; |
46 | char *sharg; | |
29dd101b BJ |
47 | struct inode *ip; |
48 | swblk_t bno; | |
7eeaac77 RE |
49 | char cfname[DIRSIZ]; |
50 | char cfarg[SHSIZE]; | |
29dd101b BJ |
51 | |
52 | if ((ip = namei(uchar, 0)) == NULL) | |
53 | return; | |
7eeaac77 | 54 | |
29dd101b BJ |
55 | bno = 0; |
56 | bp = 0; | |
7eeaac77 RE |
57 | indir = 0; |
58 | uid = u.u_uid; | |
59 | gid = u.u_gid; | |
60 | ||
61 | if (ip->i_mode & ISUID) | |
62 | uid = ip->i_uid; | |
63 | if (ip->i_mode & ISGID) | |
64 | gid = ip->i_gid; | |
65 | ||
66 | again: | |
29dd101b BJ |
67 | if(access(ip, IEXEC)) |
68 | goto bad; | |
69 | if((ip->i_mode & IFMT) != IFREG || | |
70 | (ip->i_mode & (IEXEC|(IEXEC>>3)|(IEXEC>>6))) == 0) { | |
71 | u.u_error = EACCES; | |
72 | goto bad; | |
73 | } | |
7eeaac77 RE |
74 | |
75 | /* | |
76 | * Read in first few bytes of file for segment sizes, ux_mag: | |
77 | * 407 = plain executable | |
78 | * 410 = RO text | |
79 | * 413 = demand paged RO text | |
80 | * Also an ASCII line beginning with #! is | |
81 | * the file name of a ``shell'' and arguments may be prepended | |
82 | * to the argument list if given here. | |
83 | * | |
84 | * SHELL NAMES ARE LIMITED IN LENGTH. | |
85 | * | |
86 | * ONLY ONE ARGUMENT MAY BE PASSED TO THE SHELL FROM | |
87 | * THE ASCII LINE. | |
88 | */ | |
89 | u.u_base = (caddr_t)&u.u_exdata; | |
90 | u.u_count = sizeof(u.u_exdata); | |
91 | u.u_offset = 0; | |
92 | u.u_segflg = 1; | |
93 | readi(ip); | |
94 | u.u_segflg = 0; | |
95 | if(u.u_error) | |
96 | goto bad; | |
97 | if (u.u_count > sizeof(u.u_exdata) - sizeof(u.u_exdata.Ux_A) | |
98 | && u.u_exdata.ux_shell[0] != '#') { | |
99 | u.u_error = ENOEXEC; | |
100 | goto bad; | |
101 | } | |
102 | switch (u.u_exdata.ux_mag) { | |
103 | ||
104 | case 0407: | |
105 | u.u_exdata.ux_dsize += u.u_exdata.ux_tsize; | |
106 | u.u_exdata.ux_tsize = 0; | |
107 | break; | |
108 | ||
109 | case 0413: | |
110 | case 0410: | |
111 | if (u.u_exdata.ux_tsize == 0) { | |
112 | u.u_error = ENOEXEC; | |
113 | goto bad; | |
114 | } | |
115 | break; | |
116 | ||
117 | default: | |
118 | if (u.u_exdata.ux_shell[0] != '#' || | |
119 | u.u_exdata.ux_shell[1] != '!' || | |
120 | indir) { | |
121 | u.u_error = ENOEXEC; | |
122 | goto bad; | |
123 | } | |
124 | cp = &u.u_exdata.ux_shell[2]; /* skip "#!" */ | |
125 | while (cp < &u.u_exdata.ux_shell[SHSIZE]) { | |
126 | if (*cp == '\t') | |
127 | *cp = ' '; | |
128 | else if (*cp == '\n') { | |
129 | *cp = '\0'; | |
130 | break; | |
131 | } | |
132 | cp++; | |
133 | } | |
134 | if (*cp != '\0') { | |
135 | u.u_error = ENOEXEC; | |
136 | goto bad; | |
137 | } | |
138 | cp = &u.u_exdata.ux_shell[2]; | |
139 | while (*cp == ' ') | |
140 | cp++; | |
141 | u.u_dirp = cp; | |
142 | while (*cp && *cp != ' ') | |
143 | cp++; | |
144 | sharg = NULL; | |
145 | if (*cp) { | |
146 | *cp++ = '\0'; | |
147 | while (*cp == ' ') | |
148 | cp++; | |
149 | if (*cp) { | |
150 | bcopy((caddr_t)cp, (caddr_t)cfarg, SHSIZE); | |
151 | sharg = cfarg; | |
152 | } | |
153 | } | |
154 | bcopy((caddr_t)u.u_dbuf, (caddr_t)cfname, DIRSIZ); | |
155 | indir = 1; | |
156 | iput(ip); | |
157 | ip = namei(schar, 0); | |
158 | if (ip == NULL) | |
159 | return; | |
160 | goto again; | |
161 | } | |
162 | ||
29dd101b BJ |
163 | /* |
164 | * Collect arguments on "file" in swap space. | |
165 | */ | |
166 | na = 0; | |
167 | ne = 0; | |
168 | nc = 0; | |
169 | uap = (struct execa *)u.u_ap; | |
41888f16 | 170 | if ((bno = malloc(argmap, ctod(clrnd((int) btoc(NCARGS))))) == 0) { |
29dd101b BJ |
171 | swkill(u.u_procp, "exece"); |
172 | goto bad; | |
173 | } | |
174 | if (bno % CLSIZE) | |
175 | panic("execa malloc"); | |
176 | if (uap->argp) for (;;) { | |
177 | ap = NULL; | |
7eeaac77 RE |
178 | if (na == 1 && indir) { |
179 | if (sharg == NULL) | |
180 | ap = (int)uap->fname; | |
181 | } else if (na == 2 && indir && sharg != NULL) | |
182 | ap = (int)uap->fname; | |
183 | else if (uap->argp) { | |
29dd101b BJ |
184 | ap = fuword((caddr_t)uap->argp); |
185 | uap->argp++; | |
186 | } | |
187 | if (ap==NULL && uap->envp) { | |
188 | uap->argp = NULL; | |
189 | if ((ap = fuword((caddr_t)uap->envp)) == NULL) | |
190 | break; | |
191 | uap->envp++; | |
192 | ne++; | |
193 | } | |
194 | if (ap==NULL) | |
195 | break; | |
196 | na++; | |
197 | if(ap == -1) | |
198 | u.u_error = EFAULT; | |
199 | do { | |
200 | if (nc >= NCARGS-1) | |
201 | u.u_error = E2BIG; | |
7eeaac77 RE |
202 | if (indir && na == 2 && sharg != NULL) |
203 | c = *sharg++ & 0377; | |
204 | else if ((c = fubyte((caddr_t)ap++)) < 0) | |
29dd101b | 205 | u.u_error = EFAULT; |
64d6118b BJ |
206 | if (u.u_error) { |
207 | if (bp) | |
208 | brelse(bp); | |
209 | bp = 0; | |
29dd101b | 210 | goto badarg; |
64d6118b | 211 | } |
29dd101b BJ |
212 | if ((nc&BMASK) == 0) { |
213 | if (bp) | |
214 | bdwrite(bp); | |
41888f16 BJ |
215 | bp = getblk(argdev, |
216 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
217 | cp = bp->b_un.b_addr; |
218 | } | |
219 | nc++; | |
220 | *cp++ = c; | |
221 | } while (c>0); | |
222 | } | |
223 | if (bp) | |
224 | bdwrite(bp); | |
225 | bp = 0; | |
226 | nc = (nc + NBPW-1) & ~(NBPW-1); | |
7eeaac77 RE |
227 | if (indir) |
228 | bcopy((caddr_t)cfname, (caddr_t)u.u_dbuf, DIRSIZ); | |
229 | getxfile(ip, nc + (na+4)*NBPW, uid, gid); | |
29a06346 | 230 | if (u.u_error) { |
29dd101b BJ |
231 | badarg: |
232 | for (c = 0; c < nc; c += BSIZE) | |
41888f16 | 233 | if (bp = baddr(argdev, dbtofsb(bno)+(c>>BSHIFT))) { |
29dd101b BJ |
234 | bp->b_flags |= B_AGE; /* throw away */ |
235 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
236 | brelse(bp); | |
237 | bp = 0; | |
238 | } | |
239 | goto bad; | |
240 | } | |
241 | ||
242 | /* | |
243 | * copy back arglist | |
244 | */ | |
245 | ||
246 | ucp = USRSTACK - nc - NBPW; | |
247 | ap = ucp - na*NBPW - 3*NBPW; | |
248 | u.u_ar0[SP] = ap; | |
81263dba | 249 | (void) suword((caddr_t)ap, na-ne); |
29dd101b BJ |
250 | nc = 0; |
251 | for (;;) { | |
252 | ap += NBPW; | |
253 | if (na==ne) { | |
81263dba | 254 | (void) suword((caddr_t)ap, 0); |
29dd101b BJ |
255 | ap += NBPW; |
256 | } | |
257 | if (--na < 0) | |
258 | break; | |
81263dba | 259 | (void) suword((caddr_t)ap, ucp); |
29dd101b BJ |
260 | do { |
261 | if ((nc&BMASK) == 0) { | |
262 | if (bp) | |
263 | brelse(bp); | |
41888f16 BJ |
264 | bp = bread(argdev, |
265 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
266 | bp->b_flags |= B_AGE; /* throw away */ |
267 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
268 | cp = bp->b_un.b_addr; | |
269 | } | |
81263dba | 270 | (void) subyte((caddr_t)ucp++, (c = *cp++)); |
29dd101b BJ |
271 | nc++; |
272 | } while(c&0377); | |
273 | } | |
81263dba BJ |
274 | (void) suword((caddr_t)ap, 0); |
275 | (void) suword((caddr_t)ucp, 0); | |
29dd101b BJ |
276 | setregs(); |
277 | bad: | |
278 | if (bp) | |
279 | brelse(bp); | |
280 | if (bno) | |
41888f16 | 281 | mfree(argmap, ctod(clrnd((int) btoc(NCARGS))), bno); |
29dd101b BJ |
282 | iput(ip); |
283 | } | |
284 | ||
285 | /* | |
286 | * Read in and set up memory for executed file. | |
29dd101b | 287 | */ |
7eeaac77 | 288 | getxfile(ip, nargc, uid, gid) |
29dd101b BJ |
289 | register struct inode *ip; |
290 | { | |
29dd101b | 291 | register size_t ts, ds, ss; |
7eeaac77 | 292 | int pagi; |
29dd101b | 293 | |
7eeaac77 | 294 | if (u.u_exdata.ux_mag == 0413) |
29dd101b | 295 | pagi = SPAGI; |
7eeaac77 RE |
296 | else |
297 | pagi = 0; | |
29dd101b | 298 | |
29dd101b | 299 | if(u.u_exdata.ux_tsize!=0 && (ip->i_flag&ITEXT)==0 && ip->i_count!=1) { |
3ca1542b BJ |
300 | register struct file *fp; |
301 | ||
302 | for (fp = file; fp < &file[NFILE]; fp++) | |
303 | if (fp->f_inode == ip && (fp->f_flag&FWRITE)) { | |
304 | u.u_error = ETXTBSY; | |
305 | goto bad; | |
306 | } | |
29dd101b BJ |
307 | } |
308 | ||
309 | /* | |
310 | * find text and data sizes | |
311 | * try them out for possible | |
312 | * exceed of max sizes | |
313 | */ | |
314 | ||
315 | ts = clrnd(btoc(u.u_exdata.ux_tsize)); | |
316 | ds = clrnd(btoc((u.u_exdata.ux_dsize+u.u_exdata.ux_bsize))); | |
317 | ss = clrnd(SSIZE + btoc(nargc)); | |
29a06346 BJ |
318 | if (chksize(ts, ds, ss)) |
319 | goto bad; | |
320 | u.u_cdmap = zdmap; | |
321 | u.u_csmap = zdmap; | |
322 | if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL) | |
323 | goto bad; | |
29dd101b | 324 | |
29a06346 BJ |
325 | /* |
326 | * At this point, committed to the new image! | |
327 | * Release virtual memory resources of old process, and | |
328 | * initialize the virtual memory of the new process. | |
329 | * If we resulted from vfork(), instead wakeup our | |
330 | * parent who will set SVFDONE when he has taken back | |
331 | * our resources. | |
332 | */ | |
333 | u.u_prof.pr_scale = 0; | |
334 | if ((u.u_procp->p_flag & SVFORK) == 0) | |
335 | vrelvm(); | |
336 | else { | |
337 | u.u_procp->p_flag &= ~SVFORK; | |
338 | u.u_procp->p_flag |= SKEEP; | |
339 | wakeup((caddr_t)u.u_procp); | |
340 | while ((u.u_procp->p_flag & SVFDONE) == 0) | |
341 | sleep((caddr_t)u.u_procp, PZERO - 1); | |
342 | u.u_procp->p_flag &= ~(SVFDONE|SKEEP); | |
343 | } | |
344 | u.u_procp->p_flag &= ~(SPAGI|SANOM|SUANOM|SNUSIG); | |
345 | u.u_procp->p_flag |= pagi; | |
346 | u.u_dmap = u.u_cdmap; | |
347 | u.u_smap = u.u_csmap; | |
348 | vgetvm(ts, ds, ss); | |
29dd101b | 349 | |
29a06346 | 350 | if (pagi == 0) { |
29dd101b | 351 | /* |
29a06346 | 352 | * Read in data segment. |
29dd101b | 353 | */ |
29a06346 BJ |
354 | u.u_base = (char *)ctob(ts); |
355 | u.u_offset = sizeof(u.u_exdata)+u.u_exdata.ux_tsize; | |
356 | u.u_count = u.u_exdata.ux_dsize; | |
357 | readi(ip); | |
29dd101b | 358 | } |
29a06346 BJ |
359 | xalloc(ip, pagi); |
360 | if (pagi && u.u_procp->p_textp) | |
361 | vinifod((struct fpte *)dptopte(u.u_procp, 0), | |
362 | PG_FTEXT, u.u_procp->p_textp->x_iptr, | |
363 | 1 + ts/CLSIZE, (int)btoc(u.u_exdata.ux_dsize)); | |
364 | ||
365 | /* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */ | |
366 | mtpr(TBIA, 0); | |
367 | ||
368 | /* | |
369 | * set SUID/SGID protections, if no tracing | |
370 | */ | |
371 | if ((u.u_procp->p_flag&STRC)==0) { | |
7eeaac77 RE |
372 | #ifndef MELB |
373 | if(u.u_uid != 0) | |
374 | #endif | |
375 | { | |
376 | u.u_uid = uid; | |
377 | u.u_procp->p_uid = uid; | |
378 | } | |
379 | u.u_gid = gid; | |
29a06346 BJ |
380 | } else |
381 | psignal(u.u_procp, SIGTRAP); | |
29dd101b BJ |
382 | u.u_tsize = ts; |
383 | u.u_dsize = ds; | |
384 | u.u_ssize = ss; | |
29dd101b | 385 | bad: |
29a06346 | 386 | return; |
29dd101b BJ |
387 | } |
388 | ||
389 | /* | |
390 | * Clear registers on exec | |
391 | */ | |
392 | setregs() | |
393 | { | |
594ebedd | 394 | register int (**rp)(); |
29dd101b | 395 | register i; |
bdfe5b0f | 396 | long sigmask; |
29dd101b | 397 | |
bdfe5b0f BJ |
398 | for(rp = &u.u_signal[0], sigmask = 1L; rp < &u.u_signal[NSIG]; |
399 | sigmask <<= 1, rp++) { | |
400 | switch (*rp) { | |
401 | ||
402 | case SIG_IGN: | |
403 | case SIG_DFL: | |
404 | case SIG_HOLD: | |
405 | continue; | |
406 | ||
407 | default: | |
408 | /* | |
99fa88a2 | 409 | * Normal or deferring catch; revert to default. |
bdfe5b0f | 410 | */ |
99fa88a2 BJ |
411 | (void) spl6(); |
412 | *rp = SIG_DFL; | |
bdfe5b0f BJ |
413 | if ((int)*rp & 1) |
414 | u.u_procp->p_siga0 |= sigmask; | |
415 | else | |
416 | u.u_procp->p_siga1 &= ~sigmask; | |
417 | if ((int)*rp & 2) | |
418 | u.u_procp->p_siga1 |= sigmask; | |
419 | else | |
420 | u.u_procp->p_siga1 &= ~sigmask; | |
99fa88a2 | 421 | (void) spl0(); |
bdfe5b0f BJ |
422 | continue; |
423 | } | |
424 | } | |
29dd101b BJ |
425 | /* |
426 | for(rp = &u.u_ar0[0]; rp < &u.u_ar0[16];) | |
427 | *rp++ = 0; | |
428 | */ | |
429 | u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */ | |
430 | for(i=0; i<NOFILE; i++) { | |
431 | if (u.u_pofile[i]&EXCLOSE) { | |
432 | closef(u.u_ofile[i]); | |
433 | u.u_ofile[i] = NULL; | |
bdfe5b0f | 434 | u.u_pofile[i] &= ~EXCLOSE; |
29dd101b | 435 | } |
29dd101b BJ |
436 | } |
437 | /* | |
438 | * Remember file name for accounting. | |
439 | */ | |
440 | u.u_acflag &= ~AFORK; | |
441 | bcopy((caddr_t)u.u_dbuf, (caddr_t)u.u_comm, DIRSIZ); | |
442 | } | |
443 | ||
444 | /* | |
445 | * exit system call: | |
446 | * pass back caller's arg | |
447 | */ | |
448 | rexit() | |
449 | { | |
450 | register struct a { | |
451 | int rval; | |
452 | } *uap; | |
453 | ||
454 | uap = (struct a *)u.u_ap; | |
455 | exit((uap->rval & 0377) << 8); | |
456 | } | |
457 | ||
458 | /* | |
459 | * Release resources. | |
460 | * Save u. area for parent to look at. | |
461 | * Enter zombie state. | |
462 | * Wake up parent and init processes, | |
463 | * and dispose of children. | |
464 | */ | |
465 | exit(rv) | |
466 | { | |
467 | register int i; | |
468 | register struct proc *p, *q; | |
469 | register struct file *f; | |
470 | register int x; | |
471 | ||
472 | #ifdef PGINPROF | |
473 | vmsizmon(); | |
474 | #endif | |
475 | p = u.u_procp; | |
476 | p->p_flag &= ~(STRC|SULOCK); | |
477 | p->p_flag |= SWEXIT; | |
478 | p->p_clktim = 0; | |
bdfe5b0f BJ |
479 | (void) spl6(); |
480 | if ((int)SIG_IGN & 1) | |
481 | p->p_siga0 = ~0; | |
482 | else | |
483 | p->p_siga0 = 0; | |
484 | if ((int)SIG_IGN & 2) | |
485 | p->p_siga1 = ~0; | |
486 | else | |
99fa88a2 | 487 | p->p_siga1 = 0; |
bdfe5b0f | 488 | (void) spl0(); |
dd808ba3 BJ |
489 | p->p_cpticks = 0; |
490 | p->p_pctcpu = 0; | |
29dd101b | 491 | for(i=0; i<NSIG; i++) |
594ebedd | 492 | u.u_signal[i] = SIG_IGN; |
29dd101b BJ |
493 | /* |
494 | * Release virtual memory. If we resulted from | |
495 | * a vfork(), instead give the resources back to | |
496 | * the parent. | |
497 | */ | |
498 | if ((p->p_flag & SVFORK) == 0) | |
499 | vrelvm(); | |
500 | else { | |
501 | p->p_flag &= ~SVFORK; | |
502 | wakeup((caddr_t)p); | |
503 | while ((p->p_flag & SVFDONE) == 0) | |
504 | sleep((caddr_t)p, PZERO - 1); | |
505 | p->p_flag &= ~SVFDONE; | |
506 | } | |
507 | for(i=0; i<NOFILE; i++) { | |
508 | f = u.u_ofile[i]; | |
509 | u.u_ofile[i] = NULL; | |
510 | closef(f); | |
511 | } | |
512 | plock(u.u_cdir); | |
513 | iput(u.u_cdir); | |
514 | if (u.u_rdir) { | |
515 | plock(u.u_rdir); | |
516 | iput(u.u_rdir); | |
517 | } | |
054016e1 | 518 | u.u_limit[LIM_FSIZE] = INFINITY; |
29dd101b BJ |
519 | acct(); |
520 | vrelpt(u.u_procp); | |
521 | vrelu(u.u_procp, 0); | |
522 | multprog--; | |
41888f16 | 523 | /* spl7(); /* clock will get mad because of overlaying */ |
29dd101b | 524 | p->p_stat = SZOMB; |
42343c0f | 525 | noproc = 1; |
29dd101b BJ |
526 | i = PIDHASH(p->p_pid); |
527 | x = p - proc; | |
528 | if (pidhash[i] == x) | |
529 | pidhash[i] = p->p_idhash; | |
530 | else { | |
531 | for (i = pidhash[i]; i != 0; i = proc[i].p_idhash) | |
532 | if (proc[i].p_idhash == x) { | |
533 | proc[i].p_idhash = p->p_idhash; | |
534 | goto done; | |
535 | } | |
536 | panic("exit"); | |
537 | } | |
9c82b9fd BJ |
538 | if (p->p_pid == 1) |
539 | panic("init died"); | |
29dd101b BJ |
540 | done: |
541 | ((struct xproc *)p)->xp_xstat = rv; /* overlay */ | |
542 | ((struct xproc *)p)->xp_vm = u.u_vm; /* overlay */ | |
543 | vmsadd(&((struct xproc *)p)->xp_vm, &u.u_cvm); | |
544 | for(q = &proc[0]; q < &proc[NPROC]; q++) | |
bdfe5b0f BJ |
545 | if(q->p_pptr == p) { |
546 | q->p_pptr = &proc[1]; | |
29dd101b | 547 | q->p_ppid = 1; |
bdfe5b0f BJ |
548 | wakeup((caddr_t)&proc[1]); |
549 | /* | |
0dde1c43 | 550 | * Traced processes are killed |
bdfe5b0f | 551 | * since their existence means someone is screwing up. |
62bac59f | 552 | * Stopped processes are sent a hangup and a continue. |
0dde1c43 BJ |
553 | * This is designed to be ``safe'' for setuid |
554 | * processes since they must be willing to tolerate | |
555 | * hangups anyways. | |
bdfe5b0f | 556 | */ |
0dde1c43 | 557 | if (q->p_flag&STRC) { |
bdfe5b0f BJ |
558 | q->p_flag &= ~STRC; |
559 | psignal(q, SIGKILL); | |
0dde1c43 BJ |
560 | } else if (q->p_stat == SSTOP) { |
561 | psignal(q, SIGHUP); | |
562 | psignal(q, SIGCONT); | |
bdfe5b0f | 563 | } |
8643403f BJ |
564 | /* |
565 | * Protect this process from future | |
62bac59f BJ |
566 | * tty signals, clear TSTP/TTIN/TTOU if pending, |
567 | * and set SDETACH bit on procs. | |
8643403f | 568 | */ |
934e4ecf | 569 | (void) spgrp(q, -1); |
29dd101b | 570 | } |
bdfe5b0f BJ |
571 | wakeup((caddr_t)p->p_pptr); |
572 | psignal(p->p_pptr, SIGCHLD); | |
29dd101b BJ |
573 | swtch(); |
574 | } | |
575 | ||
576 | wait() | |
577 | { | |
bdfe5b0f BJ |
578 | struct vtimes vm; |
579 | struct vtimes *vp; | |
29dd101b | 580 | |
bdfe5b0f BJ |
581 | if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { |
582 | wait1(0, (struct vtimes *)0); | |
583 | return; | |
584 | } | |
585 | vp = (struct vtimes *)u.u_ar0[R1]; | |
586 | wait1(u.u_ar0[R0], &vm); | |
587 | if (u.u_error) | |
588 | return; | |
589 | (void) copyout((caddr_t)&vm, (caddr_t)vp, sizeof (struct vtimes)); | |
29dd101b BJ |
590 | } |
591 | ||
592 | /* | |
593 | * Wait system call. | |
594 | * Search for a terminated (zombie) child, | |
595 | * finally lay it to rest, and collect its status. | |
596 | * Look also for stopped (traced) children, | |
597 | * and pass back status from them. | |
598 | */ | |
bdfe5b0f BJ |
599 | wait1(options, vp) |
600 | register options; | |
29dd101b BJ |
601 | struct vtimes *vp; |
602 | { | |
603 | register f; | |
604 | register struct proc *p; | |
605 | ||
606 | f = 0; | |
29dd101b BJ |
607 | loop: |
608 | for(p = &proc[0]; p < &proc[NPROC]; p++) | |
bdfe5b0f | 609 | if(p->p_pptr == u.u_procp) { |
29dd101b BJ |
610 | f++; |
611 | if(p->p_stat == SZOMB) { | |
612 | u.u_r.r_val1 = p->p_pid; | |
613 | u.u_r.r_val2 = ((struct xproc *)p)->xp_xstat; | |
614 | ((struct xproc *)p)->xp_xstat = 0; | |
615 | if (vp) | |
616 | *vp = ((struct xproc *)p)->xp_vm; | |
617 | vmsadd(&u.u_cvm, &((struct xproc *)p)->xp_vm); | |
618 | ((struct xproc *)p)->xp_vm = zvms; | |
619 | p->p_stat = NULL; | |
620 | p->p_pid = 0; | |
621 | p->p_ppid = 0; | |
bdfe5b0f | 622 | p->p_pptr = 0; |
29dd101b | 623 | p->p_sig = 0; |
bdfe5b0f BJ |
624 | p->p_siga0 = 0; |
625 | p->p_siga1 = 0; | |
29dd101b BJ |
626 | p->p_pgrp = 0; |
627 | p->p_flag = 0; | |
628 | p->p_wchan = 0; | |
bdfe5b0f | 629 | p->p_cursig = 0; |
29dd101b BJ |
630 | return; |
631 | } | |
bdfe5b0f BJ |
632 | if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 && |
633 | (p->p_flag&STRC || options&WUNTRACED)) { | |
634 | p->p_flag |= SWTED; | |
635 | u.u_r.r_val1 = p->p_pid; | |
636 | u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED; | |
637 | return; | |
29dd101b BJ |
638 | } |
639 | } | |
bdfe5b0f BJ |
640 | if (f==0) { |
641 | u.u_error = ECHILD; | |
642 | return; | |
643 | } | |
644 | if (options&WNOHANG) { | |
645 | u.u_r.r_val1 = 0; | |
646 | return; | |
647 | } | |
29a06346 | 648 | if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) { |
bdfe5b0f BJ |
649 | u.u_eosys = RESTARTSYS; |
650 | return; | |
29dd101b | 651 | } |
bdfe5b0f BJ |
652 | sleep((caddr_t)u.u_procp, PWAIT); |
653 | goto loop; | |
29dd101b BJ |
654 | } |
655 | ||
656 | /* | |
657 | * fork system call. | |
658 | */ | |
659 | fork() | |
660 | { | |
661 | ||
662 | u.u_cdmap = zdmap; | |
663 | u.u_csmap = zdmap; | |
664 | if (swpexpand(u.u_dsize, u.u_ssize, &u.u_cdmap, &u.u_csmap) == 0) { | |
665 | u.u_r.r_val2 = 0; | |
666 | return; | |
667 | } | |
668 | fork1(0); | |
669 | } | |
670 | ||
671 | fork1(isvfork) | |
672 | { | |
673 | register struct proc *p1, *p2; | |
674 | register a; | |
675 | ||
676 | a = 0; | |
677 | p2 = NULL; | |
678 | for(p1 = &proc[0]; p1 < &proc[NPROC]; p1++) { | |
679 | if (p1->p_stat==NULL && p2==NULL) | |
680 | p2 = p1; | |
681 | else { | |
682 | if (p1->p_uid==u.u_uid && p1->p_stat!=NULL) | |
683 | a++; | |
684 | } | |
685 | } | |
7eeaac77 | 686 | |
29dd101b BJ |
687 | /* |
688 | * Disallow if | |
689 | * No processes at all; | |
690 | * not su and too many procs owned; or | |
691 | * not su and would take last slot. | |
692 | */ | |
7eeaac77 | 693 | if (p2==NULL || (u.u_uid!=0 && (p2>=&proc[NPROC-5] || a>MAXUPRC))) { |
29dd101b BJ |
694 | u.u_error = EAGAIN; |
695 | if (!isvfork) { | |
81263dba BJ |
696 | (void) vsexpand(0, &u.u_cdmap, 1); |
697 | (void) vsexpand(0, &u.u_csmap, 1); | |
29dd101b BJ |
698 | } |
699 | goto out; | |
700 | } | |
701 | p1 = u.u_procp; | |
702 | if(newproc(isvfork)) { | |
703 | u.u_r.r_val1 = p1->p_pid; | |
704 | u.u_r.r_val2 = 1; /* child */ | |
705 | u.u_start = time; | |
706 | u.u_acflag = AFORK; | |
707 | return; | |
708 | } | |
709 | u.u_r.r_val1 = p2->p_pid; | |
710 | ||
711 | out: | |
712 | u.u_r.r_val2 = 0; | |
713 | } | |
714 | ||
715 | /* | |
716 | * break system call. | |
717 | * -- bad planning: "break" is a dirty word in C. | |
718 | */ | |
719 | sbreak() | |
720 | { | |
721 | struct a { | |
722 | char *nsiz; | |
723 | }; | |
724 | register int n, d; | |
725 | ||
726 | /* | |
727 | * set n to new data size | |
728 | * set d to new-old | |
729 | */ | |
730 | ||
731 | n = btoc(((struct a *)u.u_ap)->nsiz); | |
732 | if (!u.u_sep) | |
733 | n -= ctos(u.u_tsize) * stoc(1); | |
734 | if (n < 0) | |
735 | n = 0; | |
736 | d = clrnd(n - u.u_dsize); | |
5290ec92 | 737 | if (ctob(u.u_dsize+d) > u.u_limit[LIM_DATA]) { |
054016e1 BJ |
738 | u.u_error = ENOMEM; |
739 | return; | |
740 | } | |
29dd101b BJ |
741 | if (chksize(u.u_tsize, u.u_dsize+d, u.u_ssize)) |
742 | return; | |
743 | if (swpexpand(u.u_dsize+d, u.u_ssize, &u.u_dmap, &u.u_smap)==0) | |
744 | return; | |
745 | expand(d, P0BR); | |
746 | } |