Commit | Line | Data |
---|---|---|
b244d952 | 1 | /* kern_proc.c 3.18 %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" |
b244d952 | 20 | #include "../h/limit.h" |
29dd101b BJ |
21 | |
22 | /* | |
23 | * exec system call, with and without environments. | |
24 | */ | |
25 | struct execa { | |
26 | char *fname; | |
27 | char **argp; | |
28 | char **envp; | |
29 | }; | |
30 | ||
31 | exec() | |
32 | { | |
33 | ((struct execa *)u.u_ap)->envp = NULL; | |
34 | exece(); | |
35 | } | |
36 | ||
37 | exece() | |
38 | { | |
39 | register nc; | |
40 | register char *cp; | |
41 | register struct buf *bp; | |
42 | register struct execa *uap; | |
43 | int na, ne, ucp, ap, c; | |
44 | struct inode *ip; | |
45 | swblk_t bno; | |
46 | ||
47 | if ((ip = namei(uchar, 0)) == NULL) | |
48 | return; | |
49 | bno = 0; | |
50 | bp = 0; | |
51 | if(access(ip, IEXEC)) | |
52 | goto bad; | |
53 | if((ip->i_mode & IFMT) != IFREG || | |
54 | (ip->i_mode & (IEXEC|(IEXEC>>3)|(IEXEC>>6))) == 0) { | |
55 | u.u_error = EACCES; | |
56 | goto bad; | |
57 | } | |
58 | /* | |
59 | * Collect arguments on "file" in swap space. | |
60 | */ | |
61 | na = 0; | |
62 | ne = 0; | |
63 | nc = 0; | |
64 | uap = (struct execa *)u.u_ap; | |
41888f16 | 65 | if ((bno = malloc(argmap, ctod(clrnd((int) btoc(NCARGS))))) == 0) { |
29dd101b BJ |
66 | swkill(u.u_procp, "exece"); |
67 | goto bad; | |
68 | } | |
69 | if (bno % CLSIZE) | |
70 | panic("execa malloc"); | |
71 | if (uap->argp) for (;;) { | |
72 | ap = NULL; | |
73 | if (uap->argp) { | |
74 | ap = fuword((caddr_t)uap->argp); | |
75 | uap->argp++; | |
76 | } | |
77 | if (ap==NULL && uap->envp) { | |
78 | uap->argp = NULL; | |
79 | if ((ap = fuword((caddr_t)uap->envp)) == NULL) | |
80 | break; | |
81 | uap->envp++; | |
82 | ne++; | |
83 | } | |
84 | if (ap==NULL) | |
85 | break; | |
86 | na++; | |
87 | if(ap == -1) | |
88 | u.u_error = EFAULT; | |
89 | do { | |
90 | if (nc >= NCARGS-1) | |
91 | u.u_error = E2BIG; | |
92 | if ((c = fubyte((caddr_t)ap++)) < 0) | |
93 | u.u_error = EFAULT; | |
64d6118b BJ |
94 | if (u.u_error) { |
95 | if (bp) | |
96 | brelse(bp); | |
97 | bp = 0; | |
29dd101b | 98 | goto badarg; |
64d6118b | 99 | } |
29dd101b BJ |
100 | if ((nc&BMASK) == 0) { |
101 | if (bp) | |
102 | bdwrite(bp); | |
41888f16 BJ |
103 | bp = getblk(argdev, |
104 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
105 | cp = bp->b_un.b_addr; |
106 | } | |
107 | nc++; | |
108 | *cp++ = c; | |
109 | } while (c>0); | |
110 | } | |
111 | if (bp) | |
112 | bdwrite(bp); | |
113 | bp = 0; | |
114 | nc = (nc + NBPW-1) & ~(NBPW-1); | |
115 | if (getxfile(ip, nc) || u.u_error) { | |
116 | badarg: | |
117 | for (c = 0; c < nc; c += BSIZE) | |
41888f16 | 118 | if (bp = baddr(argdev, dbtofsb(bno)+(c>>BSHIFT))) { |
29dd101b BJ |
119 | bp->b_flags |= B_AGE; /* throw away */ |
120 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
121 | brelse(bp); | |
122 | bp = 0; | |
123 | } | |
124 | goto bad; | |
125 | } | |
126 | ||
127 | /* | |
128 | * copy back arglist | |
129 | */ | |
130 | ||
131 | ucp = USRSTACK - nc - NBPW; | |
132 | ap = ucp - na*NBPW - 3*NBPW; | |
133 | u.u_ar0[SP] = ap; | |
81263dba | 134 | (void) suword((caddr_t)ap, na-ne); |
29dd101b BJ |
135 | nc = 0; |
136 | for (;;) { | |
137 | ap += NBPW; | |
138 | if (na==ne) { | |
81263dba | 139 | (void) suword((caddr_t)ap, 0); |
29dd101b BJ |
140 | ap += NBPW; |
141 | } | |
142 | if (--na < 0) | |
143 | break; | |
81263dba | 144 | (void) suword((caddr_t)ap, ucp); |
29dd101b BJ |
145 | do { |
146 | if ((nc&BMASK) == 0) { | |
147 | if (bp) | |
148 | brelse(bp); | |
41888f16 BJ |
149 | bp = bread(argdev, |
150 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
151 | bp->b_flags |= B_AGE; /* throw away */ |
152 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
153 | cp = bp->b_un.b_addr; | |
154 | } | |
81263dba | 155 | (void) subyte((caddr_t)ucp++, (c = *cp++)); |
29dd101b BJ |
156 | nc++; |
157 | } while(c&0377); | |
158 | } | |
81263dba BJ |
159 | (void) suword((caddr_t)ap, 0); |
160 | (void) suword((caddr_t)ucp, 0); | |
29dd101b BJ |
161 | setregs(); |
162 | bad: | |
163 | if (bp) | |
164 | brelse(bp); | |
165 | if (bno) | |
41888f16 | 166 | mfree(argmap, ctod(clrnd((int) btoc(NCARGS))), bno); |
29dd101b BJ |
167 | iput(ip); |
168 | } | |
169 | ||
170 | /* | |
171 | * Read in and set up memory for executed file. | |
172 | * Zero return is normal; | |
173 | * non-zero means only the text is being replaced | |
174 | */ | |
175 | getxfile(ip, nargc) | |
176 | register struct inode *ip; | |
177 | { | |
178 | register sep; | |
179 | register size_t ts, ds, ss; | |
180 | register int overlay; | |
181 | int pagi = 0; | |
182 | ||
183 | /* | |
184 | * read in first few bytes | |
185 | * of file for segment | |
186 | * sizes: | |
187 | * ux_mag = 407/410/411/405 | |
188 | * 407 is plain executable | |
189 | * 410 is RO text | |
190 | * 411 is separated ID | |
191 | * 405 is overlaid text | |
192 | * 412 is demand paged plain executable (NOT IMPLEMENTED) | |
193 | * 413 is demand paged RO text | |
194 | */ | |
195 | ||
196 | u.u_base = (caddr_t)&u.u_exdata; | |
197 | u.u_count = sizeof(u.u_exdata); | |
198 | u.u_offset = 0; | |
199 | u.u_segflg = 1; | |
200 | readi(ip); | |
201 | u.u_segflg = 0; | |
202 | if(u.u_error) | |
203 | goto bad; | |
204 | if (u.u_count!=0) { | |
205 | u.u_error = ENOEXEC; | |
206 | goto bad; | |
207 | } | |
208 | sep = 0; | |
209 | overlay = 0; | |
210 | switch (u.u_exdata.ux_mag) { | |
211 | ||
212 | case 0405: | |
213 | overlay++; | |
214 | break; | |
215 | ||
216 | case 0412: | |
217 | u.u_error = ENOEXEC; | |
218 | goto bad; | |
219 | ||
220 | case 0407: | |
221 | u.u_exdata.ux_dsize += u.u_exdata.ux_tsize; | |
222 | u.u_exdata.ux_tsize = 0; | |
223 | break; | |
224 | ||
225 | case 0413: | |
226 | pagi = SPAGI; | |
227 | /* fall into ... */ | |
228 | ||
229 | case 0410: | |
230 | if (u.u_exdata.ux_tsize == 0) { | |
231 | u.u_error = ENOEXEC; | |
232 | goto bad; | |
233 | } | |
234 | break; | |
235 | ||
236 | case 0411: | |
237 | u.u_error = ENOEXEC; | |
238 | goto bad; | |
239 | ||
240 | default: | |
241 | u.u_error = ENOEXEC; | |
242 | goto bad; | |
243 | } | |
244 | if(u.u_exdata.ux_tsize!=0 && (ip->i_flag&ITEXT)==0 && ip->i_count!=1) { | |
245 | u.u_error = ETXTBSY; | |
246 | goto bad; | |
247 | } | |
248 | ||
249 | /* | |
250 | * find text and data sizes | |
251 | * try them out for possible | |
252 | * exceed of max sizes | |
253 | */ | |
254 | ||
255 | ts = clrnd(btoc(u.u_exdata.ux_tsize)); | |
256 | ds = clrnd(btoc((u.u_exdata.ux_dsize+u.u_exdata.ux_bsize))); | |
257 | ss = clrnd(SSIZE + btoc(nargc)); | |
258 | if (overlay) { | |
8643403f BJ |
259 | if ((u.u_procp->p_flag & SPAGI) || |
260 | u.u_sep==0 && ctos(ts) != ctos(u.u_tsize) || nargc) { | |
29dd101b BJ |
261 | u.u_error = ENOMEM; |
262 | goto bad; | |
263 | } | |
264 | ds = u.u_dsize; | |
265 | ss = u.u_ssize; | |
266 | sep = u.u_sep; | |
267 | xfree(); | |
268 | xalloc(ip, pagi); | |
269 | u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */ | |
270 | } else { | |
271 | if (chksize(ts, ds, ss)) | |
272 | goto bad; | |
273 | u.u_cdmap = zdmap; | |
274 | u.u_csmap = zdmap; | |
275 | if (swpexpand(ds, ss, &u.u_cdmap, &u.u_csmap) == NULL) | |
276 | goto bad; | |
277 | ||
278 | /* | |
279 | * At this point, committed to the new image! | |
280 | * Release virtual memory resources of old process, and | |
281 | * initialize the virtual memory of the new process. | |
282 | * If we resulted from vfork(), instead wakeup our | |
283 | * parent who will set SVFDONE when he has taken back | |
284 | * our resources. | |
285 | */ | |
286 | u.u_prof.pr_scale = 0; | |
287 | if ((u.u_procp->p_flag & SVFORK) == 0) | |
288 | vrelvm(); | |
289 | else { | |
290 | u.u_procp->p_flag &= ~SVFORK; | |
291 | u.u_procp->p_flag |= SKEEP; | |
292 | wakeup((caddr_t)u.u_procp); | |
293 | while ((u.u_procp->p_flag & SVFDONE) == 0) | |
294 | sleep((caddr_t)u.u_procp, PZERO - 1); | |
295 | u.u_procp->p_flag &= ~(SVFDONE|SKEEP); | |
296 | } | |
297 | u.u_procp->p_flag &= ~(SPAGI|SANOM|SUANOM); | |
298 | u.u_procp->p_flag |= pagi; | |
299 | u.u_dmap = u.u_cdmap; | |
300 | u.u_smap = u.u_csmap; | |
301 | vgetvm(ts, ds, ss); | |
302 | ||
303 | if (pagi == 0) { | |
304 | /* | |
305 | * Read in data segment. | |
306 | */ | |
307 | u.u_base = (char *)ctob(ts); | |
308 | u.u_offset = sizeof(u.u_exdata)+u.u_exdata.ux_tsize; | |
309 | u.u_count = u.u_exdata.ux_dsize; | |
310 | readi(ip); | |
311 | } | |
312 | xalloc(ip, pagi); | |
313 | if (pagi && u.u_procp->p_textp) | |
314 | vinifod((struct fpte *)dptopte(u.u_procp, 0), | |
315 | PG_FTEXT, u.u_procp->p_textp->x_iptr, | |
316 | 1 + ts/CLSIZE, (int)btoc(u.u_exdata.ux_dsize)); | |
317 | ||
318 | /* THIS SHOULD BE DONE AT A LOWER LEVEL, IF AT ALL */ | |
638352ae | 319 | mtpr(TBIA, 0); |
29dd101b BJ |
320 | |
321 | /* | |
322 | * set SUID/SGID protections, if no tracing | |
323 | */ | |
324 | if ((u.u_procp->p_flag&STRC)==0) { | |
325 | if(ip->i_mode&ISUID) | |
326 | if(u.u_uid != 0) { | |
327 | u.u_uid = ip->i_uid; | |
328 | u.u_procp->p_uid = ip->i_uid; | |
329 | } | |
330 | if(ip->i_mode&ISGID) | |
331 | u.u_gid = ip->i_gid; | |
332 | } else | |
594ebedd | 333 | psignal(u.u_procp, SIGTRAP); |
29dd101b BJ |
334 | } |
335 | u.u_tsize = ts; | |
336 | u.u_dsize = ds; | |
337 | u.u_ssize = ss; | |
338 | u.u_sep = sep; | |
339 | bad: | |
340 | return(overlay); | |
341 | } | |
342 | ||
343 | /* | |
344 | * Clear registers on exec | |
345 | */ | |
346 | setregs() | |
347 | { | |
594ebedd | 348 | register int (**rp)(); |
29dd101b | 349 | register i; |
bdfe5b0f | 350 | long sigmask; |
29dd101b | 351 | |
bdfe5b0f BJ |
352 | for(rp = &u.u_signal[0], sigmask = 1L; rp < &u.u_signal[NSIG]; |
353 | sigmask <<= 1, rp++) { | |
354 | switch (*rp) { | |
355 | ||
356 | case SIG_IGN: | |
357 | case SIG_DFL: | |
358 | case SIG_HOLD: | |
359 | continue; | |
360 | ||
361 | default: | |
362 | /* | |
99fa88a2 | 363 | * Normal or deferring catch; revert to default. |
bdfe5b0f | 364 | */ |
99fa88a2 BJ |
365 | (void) spl6(); |
366 | *rp = SIG_DFL; | |
bdfe5b0f BJ |
367 | if ((int)*rp & 1) |
368 | u.u_procp->p_siga0 |= sigmask; | |
369 | else | |
370 | u.u_procp->p_siga1 &= ~sigmask; | |
371 | if ((int)*rp & 2) | |
372 | u.u_procp->p_siga1 |= sigmask; | |
373 | else | |
374 | u.u_procp->p_siga1 &= ~sigmask; | |
99fa88a2 | 375 | (void) spl0(); |
bdfe5b0f BJ |
376 | continue; |
377 | } | |
378 | } | |
29dd101b BJ |
379 | /* |
380 | for(rp = &u.u_ar0[0]; rp < &u.u_ar0[16];) | |
381 | *rp++ = 0; | |
382 | */ | |
383 | u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */ | |
384 | for(i=0; i<NOFILE; i++) { | |
385 | if (u.u_pofile[i]&EXCLOSE) { | |
386 | closef(u.u_ofile[i]); | |
387 | u.u_ofile[i] = NULL; | |
bdfe5b0f | 388 | u.u_pofile[i] &= ~EXCLOSE; |
29dd101b | 389 | } |
29dd101b BJ |
390 | } |
391 | /* | |
392 | * Remember file name for accounting. | |
393 | */ | |
394 | u.u_acflag &= ~AFORK; | |
395 | bcopy((caddr_t)u.u_dbuf, (caddr_t)u.u_comm, DIRSIZ); | |
396 | } | |
397 | ||
398 | /* | |
399 | * exit system call: | |
400 | * pass back caller's arg | |
401 | */ | |
402 | rexit() | |
403 | { | |
404 | register struct a { | |
405 | int rval; | |
406 | } *uap; | |
407 | ||
408 | uap = (struct a *)u.u_ap; | |
409 | exit((uap->rval & 0377) << 8); | |
410 | } | |
411 | ||
412 | /* | |
413 | * Release resources. | |
414 | * Save u. area for parent to look at. | |
415 | * Enter zombie state. | |
416 | * Wake up parent and init processes, | |
417 | * and dispose of children. | |
418 | */ | |
419 | exit(rv) | |
420 | { | |
421 | register int i; | |
422 | register struct proc *p, *q; | |
423 | register struct file *f; | |
424 | register int x; | |
425 | ||
426 | #ifdef PGINPROF | |
427 | vmsizmon(); | |
428 | #endif | |
429 | p = u.u_procp; | |
430 | p->p_flag &= ~(STRC|SULOCK); | |
431 | p->p_flag |= SWEXIT; | |
432 | p->p_clktim = 0; | |
bdfe5b0f BJ |
433 | (void) spl6(); |
434 | if ((int)SIG_IGN & 1) | |
435 | p->p_siga0 = ~0; | |
436 | else | |
437 | p->p_siga0 = 0; | |
438 | if ((int)SIG_IGN & 2) | |
439 | p->p_siga1 = ~0; | |
440 | else | |
99fa88a2 | 441 | p->p_siga1 = 0; |
bdfe5b0f | 442 | (void) spl0(); |
29dd101b BJ |
443 | p->p_aveflt = 0; |
444 | for(i=0; i<NSIG; i++) | |
594ebedd | 445 | u.u_signal[i] = SIG_IGN; |
29dd101b BJ |
446 | /* |
447 | * Release virtual memory. If we resulted from | |
448 | * a vfork(), instead give the resources back to | |
449 | * the parent. | |
450 | */ | |
451 | if ((p->p_flag & SVFORK) == 0) | |
452 | vrelvm(); | |
453 | else { | |
454 | p->p_flag &= ~SVFORK; | |
455 | wakeup((caddr_t)p); | |
456 | while ((p->p_flag & SVFDONE) == 0) | |
457 | sleep((caddr_t)p, PZERO - 1); | |
458 | p->p_flag &= ~SVFDONE; | |
459 | } | |
460 | for(i=0; i<NOFILE; i++) { | |
461 | f = u.u_ofile[i]; | |
462 | u.u_ofile[i] = NULL; | |
463 | closef(f); | |
464 | } | |
465 | plock(u.u_cdir); | |
466 | iput(u.u_cdir); | |
467 | if (u.u_rdir) { | |
468 | plock(u.u_rdir); | |
469 | iput(u.u_rdir); | |
470 | } | |
054016e1 | 471 | u.u_limit[LIM_FSIZE] = INFINITY; |
29dd101b BJ |
472 | acct(); |
473 | vrelpt(u.u_procp); | |
474 | vrelu(u.u_procp, 0); | |
475 | multprog--; | |
41888f16 BJ |
476 | /* spl7(); /* clock will get mad because of overlaying */ |
477 | noproc = 1; | |
29dd101b BJ |
478 | p->p_stat = SZOMB; |
479 | i = PIDHASH(p->p_pid); | |
480 | x = p - proc; | |
481 | if (pidhash[i] == x) | |
482 | pidhash[i] = p->p_idhash; | |
483 | else { | |
484 | for (i = pidhash[i]; i != 0; i = proc[i].p_idhash) | |
485 | if (proc[i].p_idhash == x) { | |
486 | proc[i].p_idhash = p->p_idhash; | |
487 | goto done; | |
488 | } | |
489 | panic("exit"); | |
490 | } | |
491 | done: | |
492 | ((struct xproc *)p)->xp_xstat = rv; /* overlay */ | |
493 | ((struct xproc *)p)->xp_vm = u.u_vm; /* overlay */ | |
494 | vmsadd(&((struct xproc *)p)->xp_vm, &u.u_cvm); | |
495 | for(q = &proc[0]; q < &proc[NPROC]; q++) | |
bdfe5b0f BJ |
496 | if(q->p_pptr == p) { |
497 | q->p_pptr = &proc[1]; | |
29dd101b | 498 | q->p_ppid = 1; |
bdfe5b0f BJ |
499 | wakeup((caddr_t)&proc[1]); |
500 | /* | |
0dde1c43 | 501 | * Traced processes are killed |
bdfe5b0f | 502 | * since their existence means someone is screwing up. |
62bac59f | 503 | * Stopped processes are sent a hangup and a continue. |
0dde1c43 BJ |
504 | * This is designed to be ``safe'' for setuid |
505 | * processes since they must be willing to tolerate | |
506 | * hangups anyways. | |
bdfe5b0f | 507 | */ |
0dde1c43 | 508 | if (q->p_flag&STRC) { |
bdfe5b0f BJ |
509 | q->p_flag &= ~STRC; |
510 | psignal(q, SIGKILL); | |
0dde1c43 BJ |
511 | } else if (q->p_stat == SSTOP) { |
512 | psignal(q, SIGHUP); | |
513 | psignal(q, SIGCONT); | |
bdfe5b0f | 514 | } |
8643403f BJ |
515 | /* |
516 | * Protect this process from future | |
62bac59f BJ |
517 | * tty signals, clear TSTP/TTIN/TTOU if pending, |
518 | * and set SDETACH bit on procs. | |
8643403f | 519 | */ |
41888f16 | 520 | spgrp(q, -1); |
29dd101b | 521 | } |
bdfe5b0f BJ |
522 | wakeup((caddr_t)p->p_pptr); |
523 | psignal(p->p_pptr, SIGCHLD); | |
29dd101b BJ |
524 | swtch(); |
525 | } | |
526 | ||
527 | wait() | |
528 | { | |
bdfe5b0f BJ |
529 | struct vtimes vm; |
530 | struct vtimes *vp; | |
29dd101b | 531 | |
bdfe5b0f BJ |
532 | if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { |
533 | wait1(0, (struct vtimes *)0); | |
534 | return; | |
535 | } | |
536 | vp = (struct vtimes *)u.u_ar0[R1]; | |
537 | wait1(u.u_ar0[R0], &vm); | |
538 | if (u.u_error) | |
539 | return; | |
540 | (void) copyout((caddr_t)&vm, (caddr_t)vp, sizeof (struct vtimes)); | |
29dd101b BJ |
541 | } |
542 | ||
543 | /* | |
544 | * Wait system call. | |
545 | * Search for a terminated (zombie) child, | |
546 | * finally lay it to rest, and collect its status. | |
547 | * Look also for stopped (traced) children, | |
548 | * and pass back status from them. | |
549 | */ | |
bdfe5b0f BJ |
550 | wait1(options, vp) |
551 | register options; | |
29dd101b BJ |
552 | struct vtimes *vp; |
553 | { | |
554 | register f; | |
555 | register struct proc *p; | |
556 | ||
557 | f = 0; | |
29dd101b BJ |
558 | loop: |
559 | for(p = &proc[0]; p < &proc[NPROC]; p++) | |
bdfe5b0f | 560 | if(p->p_pptr == u.u_procp) { |
29dd101b BJ |
561 | f++; |
562 | if(p->p_stat == SZOMB) { | |
563 | u.u_r.r_val1 = p->p_pid; | |
564 | u.u_r.r_val2 = ((struct xproc *)p)->xp_xstat; | |
565 | ((struct xproc *)p)->xp_xstat = 0; | |
566 | if (vp) | |
567 | *vp = ((struct xproc *)p)->xp_vm; | |
568 | vmsadd(&u.u_cvm, &((struct xproc *)p)->xp_vm); | |
569 | ((struct xproc *)p)->xp_vm = zvms; | |
570 | p->p_stat = NULL; | |
571 | p->p_pid = 0; | |
572 | p->p_ppid = 0; | |
bdfe5b0f | 573 | p->p_pptr = 0; |
29dd101b | 574 | p->p_sig = 0; |
bdfe5b0f BJ |
575 | p->p_siga0 = 0; |
576 | p->p_siga1 = 0; | |
29dd101b BJ |
577 | p->p_pgrp = 0; |
578 | p->p_flag = 0; | |
579 | p->p_wchan = 0; | |
bdfe5b0f | 580 | p->p_cursig = 0; |
29dd101b BJ |
581 | return; |
582 | } | |
bdfe5b0f BJ |
583 | if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 && |
584 | (p->p_flag&STRC || options&WUNTRACED)) { | |
585 | p->p_flag |= SWTED; | |
586 | u.u_r.r_val1 = p->p_pid; | |
587 | u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED; | |
588 | return; | |
29dd101b BJ |
589 | } |
590 | } | |
bdfe5b0f BJ |
591 | if (f==0) { |
592 | u.u_error = ECHILD; | |
593 | return; | |
594 | } | |
595 | if (options&WNOHANG) { | |
596 | u.u_r.r_val1 = 0; | |
597 | return; | |
598 | } | |
99fa88a2 | 599 | /* |
bdfe5b0f BJ |
600 | if (setjmp(u.u_qsav)) { |
601 | u.u_eosys = RESTARTSYS; | |
602 | return; | |
29dd101b | 603 | } |
99fa88a2 | 604 | */ |
bdfe5b0f BJ |
605 | sleep((caddr_t)u.u_procp, PWAIT); |
606 | goto loop; | |
29dd101b BJ |
607 | } |
608 | ||
609 | /* | |
610 | * fork system call. | |
611 | */ | |
612 | fork() | |
613 | { | |
614 | ||
615 | u.u_cdmap = zdmap; | |
616 | u.u_csmap = zdmap; | |
617 | if (swpexpand(u.u_dsize, u.u_ssize, &u.u_cdmap, &u.u_csmap) == 0) { | |
618 | u.u_r.r_val2 = 0; | |
619 | return; | |
620 | } | |
621 | fork1(0); | |
622 | } | |
623 | ||
624 | fork1(isvfork) | |
625 | { | |
626 | register struct proc *p1, *p2; | |
627 | register a; | |
628 | ||
629 | a = 0; | |
630 | p2 = NULL; | |
631 | for(p1 = &proc[0]; p1 < &proc[NPROC]; p1++) { | |
632 | if (p1->p_stat==NULL && p2==NULL) | |
633 | p2 = p1; | |
634 | else { | |
635 | if (p1->p_uid==u.u_uid && p1->p_stat!=NULL) | |
636 | a++; | |
637 | } | |
638 | } | |
639 | /* | |
640 | * Disallow if | |
641 | * No processes at all; | |
642 | * not su and too many procs owned; or | |
643 | * not su and would take last slot. | |
644 | */ | |
645 | if (p2==NULL || (u.u_uid!=0 && (p2==&proc[NPROC-1] || a>MAXUPRC))) { | |
646 | u.u_error = EAGAIN; | |
647 | if (!isvfork) { | |
81263dba BJ |
648 | (void) vsexpand(0, &u.u_cdmap, 1); |
649 | (void) vsexpand(0, &u.u_csmap, 1); | |
29dd101b BJ |
650 | } |
651 | goto out; | |
652 | } | |
653 | p1 = u.u_procp; | |
654 | if(newproc(isvfork)) { | |
655 | u.u_r.r_val1 = p1->p_pid; | |
656 | u.u_r.r_val2 = 1; /* child */ | |
657 | u.u_start = time; | |
658 | u.u_acflag = AFORK; | |
659 | return; | |
660 | } | |
661 | u.u_r.r_val1 = p2->p_pid; | |
662 | ||
663 | out: | |
664 | u.u_r.r_val2 = 0; | |
665 | } | |
666 | ||
667 | /* | |
668 | * break system call. | |
669 | * -- bad planning: "break" is a dirty word in C. | |
670 | */ | |
671 | sbreak() | |
672 | { | |
673 | struct a { | |
674 | char *nsiz; | |
675 | }; | |
676 | register int n, d; | |
677 | ||
678 | /* | |
679 | * set n to new data size | |
680 | * set d to new-old | |
681 | */ | |
682 | ||
683 | n = btoc(((struct a *)u.u_ap)->nsiz); | |
684 | if (!u.u_sep) | |
685 | n -= ctos(u.u_tsize) * stoc(1); | |
686 | if (n < 0) | |
687 | n = 0; | |
688 | d = clrnd(n - u.u_dsize); | |
5290ec92 | 689 | if (ctob(u.u_dsize+d) > u.u_limit[LIM_DATA]) { |
054016e1 BJ |
690 | u.u_error = ENOMEM; |
691 | return; | |
692 | } | |
29dd101b BJ |
693 | if (chksize(u.u_tsize, u.u_dsize+d, u.u_ssize)) |
694 | return; | |
695 | if (swpexpand(u.u_dsize+d, u.u_ssize, &u.u_dmap, &u.u_smap)==0) | |
696 | return; | |
697 | expand(d, P0BR); | |
698 | } |