Commit | Line | Data |
---|---|---|
3ca1542b | 1 | /* kern_proc.c 3.21 %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; | |
45 | struct inode *ip; | |
46 | swblk_t bno; | |
47 | ||
48 | if ((ip = namei(uchar, 0)) == NULL) | |
49 | return; | |
50 | bno = 0; | |
51 | bp = 0; | |
52 | if(access(ip, IEXEC)) | |
53 | goto bad; | |
54 | if((ip->i_mode & IFMT) != IFREG || | |
55 | (ip->i_mode & (IEXEC|(IEXEC>>3)|(IEXEC>>6))) == 0) { | |
56 | u.u_error = EACCES; | |
57 | goto bad; | |
58 | } | |
59 | /* | |
60 | * Collect arguments on "file" in swap space. | |
61 | */ | |
62 | na = 0; | |
63 | ne = 0; | |
64 | nc = 0; | |
65 | uap = (struct execa *)u.u_ap; | |
41888f16 | 66 | if ((bno = malloc(argmap, ctod(clrnd((int) btoc(NCARGS))))) == 0) { |
29dd101b BJ |
67 | swkill(u.u_procp, "exece"); |
68 | goto bad; | |
69 | } | |
70 | if (bno % CLSIZE) | |
71 | panic("execa malloc"); | |
72 | if (uap->argp) for (;;) { | |
73 | ap = NULL; | |
74 | if (uap->argp) { | |
75 | ap = fuword((caddr_t)uap->argp); | |
76 | uap->argp++; | |
77 | } | |
78 | if (ap==NULL && uap->envp) { | |
79 | uap->argp = NULL; | |
80 | if ((ap = fuword((caddr_t)uap->envp)) == NULL) | |
81 | break; | |
82 | uap->envp++; | |
83 | ne++; | |
84 | } | |
85 | if (ap==NULL) | |
86 | break; | |
87 | na++; | |
88 | if(ap == -1) | |
89 | u.u_error = EFAULT; | |
90 | do { | |
91 | if (nc >= NCARGS-1) | |
92 | u.u_error = E2BIG; | |
93 | if ((c = fubyte((caddr_t)ap++)) < 0) | |
94 | u.u_error = EFAULT; | |
64d6118b BJ |
95 | if (u.u_error) { |
96 | if (bp) | |
97 | brelse(bp); | |
98 | bp = 0; | |
29dd101b | 99 | goto badarg; |
64d6118b | 100 | } |
29dd101b BJ |
101 | if ((nc&BMASK) == 0) { |
102 | if (bp) | |
103 | bdwrite(bp); | |
41888f16 BJ |
104 | bp = getblk(argdev, |
105 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
106 | cp = bp->b_un.b_addr; |
107 | } | |
108 | nc++; | |
109 | *cp++ = c; | |
110 | } while (c>0); | |
111 | } | |
112 | if (bp) | |
113 | bdwrite(bp); | |
114 | bp = 0; | |
115 | nc = (nc + NBPW-1) & ~(NBPW-1); | |
116 | if (getxfile(ip, nc) || u.u_error) { | |
117 | badarg: | |
118 | for (c = 0; c < nc; c += BSIZE) | |
41888f16 | 119 | if (bp = baddr(argdev, dbtofsb(bno)+(c>>BSHIFT))) { |
29dd101b BJ |
120 | bp->b_flags |= B_AGE; /* throw away */ |
121 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
122 | brelse(bp); | |
123 | bp = 0; | |
124 | } | |
125 | goto bad; | |
126 | } | |
127 | ||
128 | /* | |
129 | * copy back arglist | |
130 | */ | |
131 | ||
132 | ucp = USRSTACK - nc - NBPW; | |
133 | ap = ucp - na*NBPW - 3*NBPW; | |
134 | u.u_ar0[SP] = ap; | |
81263dba | 135 | (void) suword((caddr_t)ap, na-ne); |
29dd101b BJ |
136 | nc = 0; |
137 | for (;;) { | |
138 | ap += NBPW; | |
139 | if (na==ne) { | |
81263dba | 140 | (void) suword((caddr_t)ap, 0); |
29dd101b BJ |
141 | ap += NBPW; |
142 | } | |
143 | if (--na < 0) | |
144 | break; | |
81263dba | 145 | (void) suword((caddr_t)ap, ucp); |
29dd101b BJ |
146 | do { |
147 | if ((nc&BMASK) == 0) { | |
148 | if (bp) | |
149 | brelse(bp); | |
41888f16 BJ |
150 | bp = bread(argdev, |
151 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
152 | bp->b_flags |= B_AGE; /* throw away */ |
153 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
154 | cp = bp->b_un.b_addr; | |
155 | } | |
81263dba | 156 | (void) subyte((caddr_t)ucp++, (c = *cp++)); |
29dd101b BJ |
157 | nc++; |
158 | } while(c&0377); | |
159 | } | |
81263dba BJ |
160 | (void) suword((caddr_t)ap, 0); |
161 | (void) suword((caddr_t)ucp, 0); | |
29dd101b BJ |
162 | setregs(); |
163 | bad: | |
164 | if (bp) | |
165 | brelse(bp); | |
166 | if (bno) | |
41888f16 | 167 | mfree(argmap, ctod(clrnd((int) btoc(NCARGS))), bno); |
29dd101b BJ |
168 | iput(ip); |
169 | } | |
170 | ||
171 | /* | |
172 | * Read in and set up memory for executed file. | |
173 | * Zero return is normal; | |
174 | * non-zero means only the text is being replaced | |
175 | */ | |
176 | getxfile(ip, nargc) | |
177 | register struct inode *ip; | |
178 | { | |
179 | register sep; | |
180 | register size_t ts, ds, ss; | |
3ca1542b | 181 | int overlay; |
29dd101b BJ |
182 | int pagi = 0; |
183 | ||
184 | /* | |
185 | * read in first few bytes | |
186 | * of file for segment | |
187 | * sizes: | |
188 | * ux_mag = 407/410/411/405 | |
189 | * 407 is plain executable | |
190 | * 410 is RO text | |
191 | * 411 is separated ID | |
192 | * 405 is overlaid text | |
193 | * 412 is demand paged plain executable (NOT IMPLEMENTED) | |
194 | * 413 is demand paged RO text | |
195 | */ | |
196 | ||
197 | u.u_base = (caddr_t)&u.u_exdata; | |
198 | u.u_count = sizeof(u.u_exdata); | |
199 | u.u_offset = 0; | |
200 | u.u_segflg = 1; | |
201 | readi(ip); | |
202 | u.u_segflg = 0; | |
203 | if(u.u_error) | |
204 | goto bad; | |
205 | if (u.u_count!=0) { | |
206 | u.u_error = ENOEXEC; | |
207 | goto bad; | |
208 | } | |
209 | sep = 0; | |
210 | overlay = 0; | |
211 | switch (u.u_exdata.ux_mag) { | |
212 | ||
213 | case 0405: | |
214 | overlay++; | |
215 | break; | |
216 | ||
217 | case 0412: | |
218 | u.u_error = ENOEXEC; | |
219 | goto bad; | |
220 | ||
221 | case 0407: | |
222 | u.u_exdata.ux_dsize += u.u_exdata.ux_tsize; | |
223 | u.u_exdata.ux_tsize = 0; | |
224 | break; | |
225 | ||
226 | case 0413: | |
227 | pagi = SPAGI; | |
228 | /* fall into ... */ | |
229 | ||
230 | case 0410: | |
231 | if (u.u_exdata.ux_tsize == 0) { | |
232 | u.u_error = ENOEXEC; | |
233 | goto bad; | |
234 | } | |
235 | break; | |
236 | ||
237 | case 0411: | |
238 | u.u_error = ENOEXEC; | |
239 | goto bad; | |
240 | ||
241 | default: | |
242 | u.u_error = ENOEXEC; | |
243 | goto bad; | |
244 | } | |
245 | if(u.u_exdata.ux_tsize!=0 && (ip->i_flag&ITEXT)==0 && ip->i_count!=1) { | |
3ca1542b BJ |
246 | register struct file *fp; |
247 | ||
248 | for (fp = file; fp < &file[NFILE]; fp++) | |
249 | if (fp->f_inode == ip && (fp->f_flag&FWRITE)) { | |
250 | u.u_error = ETXTBSY; | |
251 | goto bad; | |
252 | } | |
29dd101b BJ |
253 | } |
254 | ||
255 | /* | |
256 | * find text and data sizes | |
257 | * try them out for possible | |
258 | * exceed of max sizes | |
259 | */ | |
260 | ||
261 | ts = clrnd(btoc(u.u_exdata.ux_tsize)); | |
262 | ds = clrnd(btoc((u.u_exdata.ux_dsize+u.u_exdata.ux_bsize))); | |
263 | ss = clrnd(SSIZE + btoc(nargc)); | |
264 | if (overlay) { | |
8643403f BJ |
265 | if ((u.u_procp->p_flag & SPAGI) || |
266 | u.u_sep==0 && ctos(ts) != ctos(u.u_tsize) || nargc) { | |
29dd101b BJ |
267 | u.u_error = ENOMEM; |
268 | goto bad; | |
269 | } | |
270 | ds = u.u_dsize; | |
271 | ss = u.u_ssize; | |
272 | sep = u.u_sep; | |
273 | xfree(); | |
274 | xalloc(ip, pagi); | |
275 | u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */ | |
276 | } else { | |
277 | if (chksize(ts, ds, ss)) | |
278 | goto bad; | |
279 | u.u_cdmap = zdmap; | |
280 | u.u_csmap = zdmap; | |
281 | if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL) | |
282 | goto bad; | |
283 | ||
284 | /* | |
285 | * At this point, committed to the new image! | |
286 | * Release virtual memory resources of old process, and | |
287 | * initialize the virtual memory of the new process. | |
288 | * If we resulted from vfork(), instead wakeup our | |
289 | * parent who will set SVFDONE when he has taken back | |
290 | * our resources. | |
291 | */ | |
292 | u.u_prof.pr_scale = 0; | |
293 | if ((u.u_procp->p_flag & SVFORK) == 0) | |
294 | vrelvm(); | |
295 | else { | |
296 | u.u_procp->p_flag &= ~SVFORK; | |
297 | u.u_procp->p_flag |= SKEEP; | |
298 | wakeup((caddr_t)u.u_procp); | |
299 | while ((u.u_procp->p_flag & SVFDONE) == 0) | |
300 | sleep((caddr_t)u.u_procp, PZERO - 1); | |
301 | u.u_procp->p_flag &= ~(SVFDONE|SKEEP); | |
302 | } | |
303 | u.u_procp->p_flag &= ~(SPAGI|SANOM|SUANOM); | |
304 | u.u_procp->p_flag |= pagi; | |
305 | u.u_dmap = u.u_cdmap; | |
306 | u.u_smap = u.u_csmap; | |
307 | vgetvm(ts, ds, ss); | |
308 | ||
309 | if (pagi == 0) { | |
310 | /* | |
311 | * Read in data segment. | |
312 | */ | |
313 | u.u_base = (char *)ctob(ts); | |
314 | u.u_offset = sizeof(u.u_exdata)+u.u_exdata.ux_tsize; | |
315 | u.u_count = u.u_exdata.ux_dsize; | |
316 | readi(ip); | |
317 | } | |
318 | xalloc(ip, pagi); | |
319 | if (pagi && u.u_procp->p_textp) | |
320 | vinifod((struct fpte *)dptopte(u.u_procp, 0), | |
321 | PG_FTEXT, u.u_procp->p_textp->x_iptr, | |
322 | 1 + ts/CLSIZE, (int)btoc(u.u_exdata.ux_dsize)); | |
323 | ||
324 | /* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */ | |
638352ae | 325 | mtpr(TBIA, 0); |
29dd101b BJ |
326 | |
327 | /* | |
328 | * set SUID/SGID protections, if no tracing | |
329 | */ | |
330 | if ((u.u_procp->p_flag&STRC)==0) { | |
331 | if(ip->i_mode&ISUID) | |
332 | if(u.u_uid != 0) { | |
333 | u.u_uid = ip->i_uid; | |
334 | u.u_procp->p_uid = ip->i_uid; | |
335 | } | |
336 | if(ip->i_mode&ISGID) | |
337 | u.u_gid = ip->i_gid; | |
338 | } else | |
594ebedd | 339 | psignal(u.u_procp, SIGTRAP); |
29dd101b BJ |
340 | } |
341 | u.u_tsize = ts; | |
342 | u.u_dsize = ds; | |
343 | u.u_ssize = ss; | |
344 | u.u_sep = sep; | |
345 | bad: | |
346 | return(overlay); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Clear registers on exec | |
351 | */ | |
352 | setregs() | |
353 | { | |
594ebedd | 354 | register int (**rp)(); |
29dd101b | 355 | register i; |
bdfe5b0f | 356 | long sigmask; |
29dd101b | 357 | |
bdfe5b0f BJ |
358 | for(rp = &u.u_signal[0], sigmask = 1L; rp < &u.u_signal[NSIG]; |
359 | sigmask <<= 1, rp++) { | |
360 | switch (*rp) { | |
361 | ||
362 | case SIG_IGN: | |
363 | case SIG_DFL: | |
364 | case SIG_HOLD: | |
365 | continue; | |
366 | ||
367 | default: | |
368 | /* | |
99fa88a2 | 369 | * Normal or deferring catch; revert to default. |
bdfe5b0f | 370 | */ |
99fa88a2 BJ |
371 | (void) spl6(); |
372 | *rp = SIG_DFL; | |
bdfe5b0f BJ |
373 | if ((int)*rp & 1) |
374 | u.u_procp->p_siga0 |= sigmask; | |
375 | else | |
376 | u.u_procp->p_siga1 &= ~sigmask; | |
377 | if ((int)*rp & 2) | |
378 | u.u_procp->p_siga1 |= sigmask; | |
379 | else | |
380 | u.u_procp->p_siga1 &= ~sigmask; | |
99fa88a2 | 381 | (void) spl0(); |
bdfe5b0f BJ |
382 | continue; |
383 | } | |
384 | } | |
29dd101b BJ |
385 | /* |
386 | for(rp = &u.u_ar0[0]; rp < &u.u_ar0[16];) | |
387 | *rp++ = 0; | |
388 | */ | |
389 | u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */ | |
390 | for(i=0; i<NOFILE; i++) { | |
391 | if (u.u_pofile[i]&EXCLOSE) { | |
392 | closef(u.u_ofile[i]); | |
393 | u.u_ofile[i] = NULL; | |
bdfe5b0f | 394 | u.u_pofile[i] &= ~EXCLOSE; |
29dd101b | 395 | } |
29dd101b BJ |
396 | } |
397 | /* | |
398 | * Remember file name for accounting. | |
399 | */ | |
400 | u.u_acflag &= ~AFORK; | |
401 | bcopy((caddr_t)u.u_dbuf, (caddr_t)u.u_comm, DIRSIZ); | |
402 | } | |
403 | ||
404 | /* | |
405 | * exit system call: | |
406 | * pass back caller's arg | |
407 | */ | |
408 | rexit() | |
409 | { | |
410 | register struct a { | |
411 | int rval; | |
412 | } *uap; | |
413 | ||
414 | uap = (struct a *)u.u_ap; | |
415 | exit((uap->rval & 0377) << 8); | |
416 | } | |
417 | ||
418 | /* | |
419 | * Release resources. | |
420 | * Save u. area for parent to look at. | |
421 | * Enter zombie state. | |
422 | * Wake up parent and init processes, | |
423 | * and dispose of children. | |
424 | */ | |
425 | exit(rv) | |
426 | { | |
427 | register int i; | |
428 | register struct proc *p, *q; | |
429 | register struct file *f; | |
430 | register int x; | |
431 | ||
432 | #ifdef PGINPROF | |
433 | vmsizmon(); | |
434 | #endif | |
435 | p = u.u_procp; | |
436 | p->p_flag &= ~(STRC|SULOCK); | |
437 | p->p_flag |= SWEXIT; | |
438 | p->p_clktim = 0; | |
bdfe5b0f BJ |
439 | (void) spl6(); |
440 | if ((int)SIG_IGN & 1) | |
441 | p->p_siga0 = ~0; | |
442 | else | |
443 | p->p_siga0 = 0; | |
444 | if ((int)SIG_IGN & 2) | |
445 | p->p_siga1 = ~0; | |
446 | else | |
99fa88a2 | 447 | p->p_siga1 = 0; |
bdfe5b0f | 448 | (void) spl0(); |
29dd101b BJ |
449 | p->p_aveflt = 0; |
450 | for(i=0; i<NSIG; i++) | |
594ebedd | 451 | u.u_signal[i] = SIG_IGN; |
29dd101b BJ |
452 | /* |
453 | * Release virtual memory. If we resulted from | |
454 | * a vfork(), instead give the resources back to | |
455 | * the parent. | |
456 | */ | |
457 | if ((p->p_flag & SVFORK) == 0) | |
458 | vrelvm(); | |
459 | else { | |
460 | p->p_flag &= ~SVFORK; | |
461 | wakeup((caddr_t)p); | |
462 | while ((p->p_flag & SVFDONE) == 0) | |
463 | sleep((caddr_t)p, PZERO - 1); | |
464 | p->p_flag &= ~SVFDONE; | |
465 | } | |
466 | for(i=0; i<NOFILE; i++) { | |
467 | f = u.u_ofile[i]; | |
468 | u.u_ofile[i] = NULL; | |
469 | closef(f); | |
470 | } | |
471 | plock(u.u_cdir); | |
472 | iput(u.u_cdir); | |
473 | if (u.u_rdir) { | |
474 | plock(u.u_rdir); | |
475 | iput(u.u_rdir); | |
476 | } | |
054016e1 | 477 | u.u_limit[LIM_FSIZE] = INFINITY; |
29dd101b BJ |
478 | acct(); |
479 | vrelpt(u.u_procp); | |
480 | vrelu(u.u_procp, 0); | |
481 | multprog--; | |
41888f16 BJ |
482 | /* spl7(); /* clock will get mad because of overlaying */ |
483 | noproc = 1; | |
29dd101b BJ |
484 | p->p_stat = SZOMB; |
485 | i = PIDHASH(p->p_pid); | |
486 | x = p - proc; | |
487 | if (pidhash[i] == x) | |
488 | pidhash[i] = p->p_idhash; | |
489 | else { | |
490 | for (i = pidhash[i]; i != 0; i = proc[i].p_idhash) | |
491 | if (proc[i].p_idhash == x) { | |
492 | proc[i].p_idhash = p->p_idhash; | |
493 | goto done; | |
494 | } | |
495 | panic("exit"); | |
496 | } | |
497 | done: | |
498 | ((struct xproc *)p)->xp_xstat = rv; /* overlay */ | |
499 | ((struct xproc *)p)->xp_vm = u.u_vm; /* overlay */ | |
500 | vmsadd(&((struct xproc *)p)->xp_vm, &u.u_cvm); | |
501 | for(q = &proc[0]; q < &proc[NPROC]; q++) | |
bdfe5b0f BJ |
502 | if(q->p_pptr == p) { |
503 | q->p_pptr = &proc[1]; | |
29dd101b | 504 | q->p_ppid = 1; |
bdfe5b0f BJ |
505 | wakeup((caddr_t)&proc[1]); |
506 | /* | |
0dde1c43 | 507 | * Traced processes are killed |
bdfe5b0f | 508 | * since their existence means someone is screwing up. |
62bac59f | 509 | * Stopped processes are sent a hangup and a continue. |
0dde1c43 BJ |
510 | * This is designed to be ``safe'' for setuid |
511 | * processes since they must be willing to tolerate | |
512 | * hangups anyways. | |
bdfe5b0f | 513 | */ |
0dde1c43 | 514 | if (q->p_flag&STRC) { |
bdfe5b0f BJ |
515 | q->p_flag &= ~STRC; |
516 | psignal(q, SIGKILL); | |
0dde1c43 BJ |
517 | } else if (q->p_stat == SSTOP) { |
518 | psignal(q, SIGHUP); | |
519 | psignal(q, SIGCONT); | |
bdfe5b0f | 520 | } |
8643403f BJ |
521 | /* |
522 | * Protect this process from future | |
62bac59f BJ |
523 | * tty signals, clear TSTP/TTIN/TTOU if pending, |
524 | * and set SDETACH bit on procs. | |
8643403f | 525 | */ |
41888f16 | 526 | spgrp(q, -1); |
29dd101b | 527 | } |
bdfe5b0f BJ |
528 | wakeup((caddr_t)p->p_pptr); |
529 | psignal(p->p_pptr, SIGCHLD); | |
29dd101b BJ |
530 | swtch(); |
531 | } | |
532 | ||
533 | wait() | |
534 | { | |
bdfe5b0f BJ |
535 | struct vtimes vm; |
536 | struct vtimes *vp; | |
29dd101b | 537 | |
bdfe5b0f BJ |
538 | if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { |
539 | wait1(0, (struct vtimes *)0); | |
540 | return; | |
541 | } | |
542 | vp = (struct vtimes *)u.u_ar0[R1]; | |
543 | wait1(u.u_ar0[R0], &vm); | |
544 | if (u.u_error) | |
545 | return; | |
546 | (void) copyout((caddr_t)&vm, (caddr_t)vp, sizeof (struct vtimes)); | |
29dd101b BJ |
547 | } |
548 | ||
549 | /* | |
550 | * Wait system call. | |
551 | * Search for a terminated (zombie) child, | |
552 | * finally lay it to rest, and collect its status. | |
553 | * Look also for stopped (traced) children, | |
554 | * and pass back status from them. | |
555 | */ | |
bdfe5b0f BJ |
556 | wait1(options, vp) |
557 | register options; | |
29dd101b BJ |
558 | struct vtimes *vp; |
559 | { | |
560 | register f; | |
561 | register struct proc *p; | |
562 | ||
563 | f = 0; | |
29dd101b BJ |
564 | loop: |
565 | for(p = &proc[0]; p < &proc[NPROC]; p++) | |
bdfe5b0f | 566 | if(p->p_pptr == u.u_procp) { |
29dd101b BJ |
567 | f++; |
568 | if(p->p_stat == SZOMB) { | |
569 | u.u_r.r_val1 = p->p_pid; | |
570 | u.u_r.r_val2 = ((struct xproc *)p)->xp_xstat; | |
571 | ((struct xproc *)p)->xp_xstat = 0; | |
572 | if (vp) | |
573 | *vp = ((struct xproc *)p)->xp_vm; | |
574 | vmsadd(&u.u_cvm, &((struct xproc *)p)->xp_vm); | |
575 | ((struct xproc *)p)->xp_vm = zvms; | |
576 | p->p_stat = NULL; | |
577 | p->p_pid = 0; | |
578 | p->p_ppid = 0; | |
bdfe5b0f | 579 | p->p_pptr = 0; |
29dd101b | 580 | p->p_sig = 0; |
bdfe5b0f BJ |
581 | p->p_siga0 = 0; |
582 | p->p_siga1 = 0; | |
29dd101b BJ |
583 | p->p_pgrp = 0; |
584 | p->p_flag = 0; | |
585 | p->p_wchan = 0; | |
bdfe5b0f | 586 | p->p_cursig = 0; |
29dd101b BJ |
587 | return; |
588 | } | |
bdfe5b0f BJ |
589 | if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 && |
590 | (p->p_flag&STRC || options&WUNTRACED)) { | |
591 | p->p_flag |= SWTED; | |
592 | u.u_r.r_val1 = p->p_pid; | |
593 | u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED; | |
594 | return; | |
29dd101b BJ |
595 | } |
596 | } | |
bdfe5b0f BJ |
597 | if (f==0) { |
598 | u.u_error = ECHILD; | |
599 | return; | |
600 | } | |
601 | if (options&WNOHANG) { | |
602 | u.u_r.r_val1 = 0; | |
603 | return; | |
604 | } | |
99fa88a2 | 605 | /* |
bdfe5b0f BJ |
606 | if (setjmp(u.u_qsav)) { |
607 | u.u_eosys = RESTARTSYS; | |
608 | return; | |
29dd101b | 609 | } |
99fa88a2 | 610 | */ |
bdfe5b0f BJ |
611 | sleep((caddr_t)u.u_procp, PWAIT); |
612 | goto loop; | |
29dd101b BJ |
613 | } |
614 | ||
615 | /* | |
616 | * fork system call. | |
617 | */ | |
618 | fork() | |
619 | { | |
620 | ||
621 | u.u_cdmap = zdmap; | |
622 | u.u_csmap = zdmap; | |
623 | if (swpexpand(u.u_dsize, u.u_ssize, &u.u_cdmap, &u.u_csmap) == 0) { | |
624 | u.u_r.r_val2 = 0; | |
625 | return; | |
626 | } | |
627 | fork1(0); | |
628 | } | |
629 | ||
630 | fork1(isvfork) | |
631 | { | |
632 | register struct proc *p1, *p2; | |
633 | register a; | |
634 | ||
635 | a = 0; | |
636 | p2 = NULL; | |
637 | for(p1 = &proc[0]; p1 < &proc[NPROC]; p1++) { | |
638 | if (p1->p_stat==NULL && p2==NULL) | |
639 | p2 = p1; | |
640 | else { | |
641 | if (p1->p_uid==u.u_uid && p1->p_stat!=NULL) | |
642 | a++; | |
643 | } | |
644 | } | |
645 | /* | |
646 | * Disallow if | |
647 | * No processes at all; | |
648 | * not su and too many procs owned; or | |
649 | * not su and would take last slot. | |
650 | */ | |
651 | if (p2==NULL || (u.u_uid!=0 && (p2==&proc[NPROC-1] || a>MAXUPRC))) { | |
652 | u.u_error = EAGAIN; | |
653 | if (!isvfork) { | |
81263dba BJ |
654 | (void) vsexpand(0, &u.u_cdmap, 1); |
655 | (void) vsexpand(0, &u.u_csmap, 1); | |
29dd101b BJ |
656 | } |
657 | goto out; | |
658 | } | |
659 | p1 = u.u_procp; | |
660 | if(newproc(isvfork)) { | |
661 | u.u_r.r_val1 = p1->p_pid; | |
662 | u.u_r.r_val2 = 1; /* child */ | |
663 | u.u_start = time; | |
664 | u.u_acflag = AFORK; | |
665 | return; | |
666 | } | |
667 | u.u_r.r_val1 = p2->p_pid; | |
668 | ||
669 | out: | |
670 | u.u_r.r_val2 = 0; | |
671 | } | |
672 | ||
673 | /* | |
674 | * break system call. | |
675 | * -- bad planning: "break" is a dirty word in C. | |
676 | */ | |
677 | sbreak() | |
678 | { | |
679 | struct a { | |
680 | char *nsiz; | |
681 | }; | |
682 | register int n, d; | |
683 | ||
684 | /* | |
685 | * set n to new data size | |
686 | * set d to new-old | |
687 | */ | |
688 | ||
689 | n = btoc(((struct a *)u.u_ap)->nsiz); | |
690 | if (!u.u_sep) | |
691 | n -= ctos(u.u_tsize) * stoc(1); | |
692 | if (n < 0) | |
693 | n = 0; | |
694 | d = clrnd(n - u.u_dsize); | |
5290ec92 | 695 | if (ctob(u.u_dsize+d) > u.u_limit[LIM_DATA]) { |
054016e1 BJ |
696 | u.u_error = ENOMEM; |
697 | return; | |
698 | } | |
29dd101b BJ |
699 | if (chksize(u.u_tsize, u.u_dsize+d, u.u_ssize)) |
700 | return; | |
701 | if (swpexpand(u.u_dsize+d, u.u_ssize, &u.u_dmap, &u.u_smap)==0) | |
702 | return; | |
703 | expand(d, P0BR); | |
704 | } |