Commit | Line | Data |
---|---|---|
e92a04af | 1 | /* kern_proc.c 4.13 81/11/08 */ |
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; | |
54 | bno = 0; | |
55 | bp = 0; | |
7eeaac77 RE |
56 | indir = 0; |
57 | uid = u.u_uid; | |
58 | gid = u.u_gid; | |
7eeaac77 RE |
59 | if (ip->i_mode & ISUID) |
60 | uid = ip->i_uid; | |
61 | if (ip->i_mode & ISGID) | |
62 | gid = ip->i_gid; | |
63 | ||
64 | again: | |
e92a04af | 65 | if (access(ip, IEXEC)) |
29dd101b | 66 | goto bad; |
e92a04af | 67 | if ((u.u_procp->p_flag&STRC) && access(ip, IREAD)) |
eb83bf86 | 68 | goto bad; |
e92a04af | 69 | if ((ip->i_mode & IFMT) != IFREG || |
29dd101b BJ |
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; | |
e92a04af | 95 | if (u.u_error) |
7eeaac77 RE |
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; | |
b725a0ca | 170 | if ((bno = rmalloc(argmap, ctod(clrnd((int) btoc(NCARGS))))) == 0) { |
29dd101b BJ |
171 | swkill(u.u_procp, "exece"); |
172 | goto bad; | |
173 | } | |
174 | if (bno % CLSIZE) | |
b725a0ca | 175 | panic("execa rmalloc"); |
29dd101b BJ |
176 | if (uap->argp) for (;;) { |
177 | ap = NULL; | |
40d07ebb | 178 | if (indir && (na == 1 || na == 2 && sharg)) |
7eeaac77 RE |
179 | ap = (int)uap->fname; |
180 | else if (uap->argp) { | |
29dd101b BJ |
181 | ap = fuword((caddr_t)uap->argp); |
182 | uap->argp++; | |
183 | } | |
184 | if (ap==NULL && uap->envp) { | |
185 | uap->argp = NULL; | |
186 | if ((ap = fuword((caddr_t)uap->envp)) == NULL) | |
187 | break; | |
188 | uap->envp++; | |
189 | ne++; | |
190 | } | |
191 | if (ap==NULL) | |
192 | break; | |
193 | na++; | |
e92a04af | 194 | if (ap == -1) |
29dd101b BJ |
195 | u.u_error = EFAULT; |
196 | do { | |
197 | if (nc >= NCARGS-1) | |
198 | u.u_error = E2BIG; | |
7eeaac77 RE |
199 | if (indir && na == 2 && sharg != NULL) |
200 | c = *sharg++ & 0377; | |
201 | else if ((c = fubyte((caddr_t)ap++)) < 0) | |
29dd101b | 202 | u.u_error = EFAULT; |
64d6118b BJ |
203 | if (u.u_error) { |
204 | if (bp) | |
205 | brelse(bp); | |
206 | bp = 0; | |
29dd101b | 207 | goto badarg; |
64d6118b | 208 | } |
29dd101b BJ |
209 | if ((nc&BMASK) == 0) { |
210 | if (bp) | |
211 | bdwrite(bp); | |
41888f16 BJ |
212 | bp = getblk(argdev, |
213 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
214 | cp = bp->b_un.b_addr; |
215 | } | |
216 | nc++; | |
217 | *cp++ = c; | |
218 | } while (c>0); | |
219 | } | |
220 | if (bp) | |
221 | bdwrite(bp); | |
222 | bp = 0; | |
223 | nc = (nc + NBPW-1) & ~(NBPW-1); | |
7eeaac77 RE |
224 | if (indir) |
225 | bcopy((caddr_t)cfname, (caddr_t)u.u_dbuf, DIRSIZ); | |
226 | getxfile(ip, nc + (na+4)*NBPW, uid, gid); | |
29a06346 | 227 | if (u.u_error) { |
29dd101b BJ |
228 | badarg: |
229 | for (c = 0; c < nc; c += BSIZE) | |
41888f16 | 230 | if (bp = baddr(argdev, dbtofsb(bno)+(c>>BSHIFT))) { |
29dd101b BJ |
231 | bp->b_flags |= B_AGE; /* throw away */ |
232 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
233 | brelse(bp); | |
234 | bp = 0; | |
235 | } | |
236 | goto bad; | |
237 | } | |
238 | ||
239 | /* | |
240 | * copy back arglist | |
241 | */ | |
29dd101b BJ |
242 | ucp = USRSTACK - nc - NBPW; |
243 | ap = ucp - na*NBPW - 3*NBPW; | |
244 | u.u_ar0[SP] = ap; | |
81263dba | 245 | (void) suword((caddr_t)ap, na-ne); |
29dd101b BJ |
246 | nc = 0; |
247 | for (;;) { | |
248 | ap += NBPW; | |
249 | if (na==ne) { | |
81263dba | 250 | (void) suword((caddr_t)ap, 0); |
29dd101b BJ |
251 | ap += NBPW; |
252 | } | |
253 | if (--na < 0) | |
254 | break; | |
81263dba | 255 | (void) suword((caddr_t)ap, ucp); |
29dd101b BJ |
256 | do { |
257 | if ((nc&BMASK) == 0) { | |
258 | if (bp) | |
259 | brelse(bp); | |
41888f16 BJ |
260 | bp = bread(argdev, |
261 | (daddr_t)(dbtofsb(bno)+(nc>>BSHIFT))); | |
29dd101b BJ |
262 | bp->b_flags |= B_AGE; /* throw away */ |
263 | bp->b_flags &= ~B_DELWRI; /* cancel io */ | |
264 | cp = bp->b_un.b_addr; | |
265 | } | |
81263dba | 266 | (void) subyte((caddr_t)ucp++, (c = *cp++)); |
29dd101b BJ |
267 | nc++; |
268 | } while(c&0377); | |
269 | } | |
81263dba BJ |
270 | (void) suword((caddr_t)ap, 0); |
271 | (void) suword((caddr_t)ucp, 0); | |
29dd101b BJ |
272 | setregs(); |
273 | bad: | |
274 | if (bp) | |
275 | brelse(bp); | |
276 | if (bno) | |
b725a0ca | 277 | rmfree(argmap, ctod(clrnd((int) btoc(NCARGS))), bno); |
29dd101b BJ |
278 | iput(ip); |
279 | } | |
280 | ||
281 | /* | |
282 | * Read in and set up memory for executed file. | |
29dd101b | 283 | */ |
7eeaac77 | 284 | getxfile(ip, nargc, uid, gid) |
29dd101b BJ |
285 | register struct inode *ip; |
286 | { | |
29dd101b | 287 | register size_t ts, ds, ss; |
7eeaac77 | 288 | int pagi; |
29dd101b | 289 | |
7eeaac77 | 290 | if (u.u_exdata.ux_mag == 0413) |
29dd101b | 291 | pagi = SPAGI; |
7eeaac77 RE |
292 | else |
293 | pagi = 0; | |
e92a04af BJ |
294 | if (u.u_exdata.ux_tsize!=0 && (ip->i_flag&ITEXT)==0 && |
295 | ip->i_count!=1) { | |
3ca1542b BJ |
296 | register struct file *fp; |
297 | ||
e92a04af BJ |
298 | for (fp = file; fp < fileNFILE; fp++) { |
299 | if (fp->f_flag & FSOCKET) | |
300 | continue; | |
3ca1542b BJ |
301 | if (fp->f_inode == ip && (fp->f_flag&FWRITE)) { |
302 | u.u_error = ETXTBSY; | |
303 | goto bad; | |
304 | } | |
e92a04af | 305 | } |
29dd101b BJ |
306 | } |
307 | ||
308 | /* | |
e92a04af | 309 | * Compute text and data sizes and make sure not too large. |
29dd101b | 310 | */ |
29dd101b BJ |
311 | ts = clrnd(btoc(u.u_exdata.ux_tsize)); |
312 | ds = clrnd(btoc((u.u_exdata.ux_dsize+u.u_exdata.ux_bsize))); | |
313 | ss = clrnd(SSIZE + btoc(nargc)); | |
29a06346 BJ |
314 | if (chksize(ts, ds, ss)) |
315 | goto bad; | |
e92a04af BJ |
316 | |
317 | /* | |
318 | * Make sure enough space to start process. | |
319 | */ | |
29a06346 BJ |
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 | } | |
2ce421b6 | 344 | u.u_procp->p_flag &= ~(SPAGI|SSEQL|SUANOM|SNUSIG); |
29a06346 BJ |
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) { | |
e92a04af BJ |
372 | u.u_uid = uid; |
373 | u.u_procp->p_uid = uid; | |
7eeaac77 | 374 | u.u_gid = gid; |
29a06346 BJ |
375 | } else |
376 | psignal(u.u_procp, SIGTRAP); | |
29dd101b BJ |
377 | u.u_tsize = ts; |
378 | u.u_dsize = ds; | |
379 | u.u_ssize = ss; | |
29dd101b | 380 | bad: |
29a06346 | 381 | return; |
29dd101b BJ |
382 | } |
383 | ||
384 | /* | |
385 | * Clear registers on exec | |
386 | */ | |
387 | setregs() | |
388 | { | |
594ebedd | 389 | register int (**rp)(); |
29dd101b | 390 | register i; |
bdfe5b0f | 391 | long sigmask; |
29dd101b | 392 | |
e92a04af | 393 | for (rp = &u.u_signal[0], sigmask = 1L; rp < &u.u_signal[NSIG]; |
bdfe5b0f BJ |
394 | sigmask <<= 1, rp++) { |
395 | switch (*rp) { | |
396 | ||
397 | case SIG_IGN: | |
398 | case SIG_DFL: | |
399 | case SIG_HOLD: | |
400 | continue; | |
401 | ||
402 | default: | |
403 | /* | |
99fa88a2 | 404 | * Normal or deferring catch; revert to default. |
bdfe5b0f | 405 | */ |
99fa88a2 BJ |
406 | (void) spl6(); |
407 | *rp = SIG_DFL; | |
bdfe5b0f BJ |
408 | if ((int)*rp & 1) |
409 | u.u_procp->p_siga0 |= sigmask; | |
410 | else | |
411 | u.u_procp->p_siga1 &= ~sigmask; | |
412 | if ((int)*rp & 2) | |
413 | u.u_procp->p_siga1 |= sigmask; | |
414 | else | |
415 | u.u_procp->p_siga1 &= ~sigmask; | |
99fa88a2 | 416 | (void) spl0(); |
bdfe5b0f BJ |
417 | continue; |
418 | } | |
419 | } | |
29dd101b | 420 | /* |
e92a04af | 421 | for (rp = &u.u_ar0[0]; rp < &u.u_ar0[16];) |
29dd101b BJ |
422 | *rp++ = 0; |
423 | */ | |
424 | u.u_ar0[PC] = u.u_exdata.ux_entloc + 2; /* skip over entry mask */ | |
e92a04af | 425 | for (i=0; i<NOFILE; i++) { |
29dd101b BJ |
426 | if (u.u_pofile[i]&EXCLOSE) { |
427 | closef(u.u_ofile[i]); | |
428 | u.u_ofile[i] = NULL; | |
bdfe5b0f | 429 | u.u_pofile[i] &= ~EXCLOSE; |
29dd101b | 430 | } |
29dd101b | 431 | } |
e92a04af | 432 | |
29dd101b BJ |
433 | /* |
434 | * Remember file name for accounting. | |
435 | */ | |
436 | u.u_acflag &= ~AFORK; | |
437 | bcopy((caddr_t)u.u_dbuf, (caddr_t)u.u_comm, DIRSIZ); | |
438 | } | |
439 | ||
440 | /* | |
e92a04af | 441 | * Exit system call: pass back caller's arg |
29dd101b BJ |
442 | */ |
443 | rexit() | |
444 | { | |
445 | register struct a { | |
446 | int rval; | |
447 | } *uap; | |
448 | ||
449 | uap = (struct a *)u.u_ap; | |
450 | exit((uap->rval & 0377) << 8); | |
451 | } | |
452 | ||
453 | /* | |
454 | * Release resources. | |
455 | * Save u. area for parent to look at. | |
456 | * Enter zombie state. | |
457 | * Wake up parent and init processes, | |
458 | * and dispose of children. | |
459 | */ | |
460 | exit(rv) | |
461 | { | |
462 | register int i; | |
463 | register struct proc *p, *q; | |
464 | register struct file *f; | |
465 | register int x; | |
466 | ||
467 | #ifdef PGINPROF | |
468 | vmsizmon(); | |
469 | #endif | |
470 | p = u.u_procp; | |
471 | p->p_flag &= ~(STRC|SULOCK); | |
472 | p->p_flag |= SWEXIT; | |
473 | p->p_clktim = 0; | |
bdfe5b0f BJ |
474 | (void) spl6(); |
475 | if ((int)SIG_IGN & 1) | |
476 | p->p_siga0 = ~0; | |
477 | else | |
478 | p->p_siga0 = 0; | |
479 | if ((int)SIG_IGN & 2) | |
480 | p->p_siga1 = ~0; | |
481 | else | |
99fa88a2 | 482 | p->p_siga1 = 0; |
bdfe5b0f | 483 | (void) spl0(); |
dd808ba3 BJ |
484 | p->p_cpticks = 0; |
485 | p->p_pctcpu = 0; | |
e92a04af | 486 | for (i=0; i<NSIG; i++) |
594ebedd | 487 | u.u_signal[i] = SIG_IGN; |
29dd101b BJ |
488 | /* |
489 | * Release virtual memory. If we resulted from | |
490 | * a vfork(), instead give the resources back to | |
491 | * the parent. | |
492 | */ | |
493 | if ((p->p_flag & SVFORK) == 0) | |
494 | vrelvm(); | |
495 | else { | |
496 | p->p_flag &= ~SVFORK; | |
497 | wakeup((caddr_t)p); | |
498 | while ((p->p_flag & SVFDONE) == 0) | |
499 | sleep((caddr_t)p, PZERO - 1); | |
500 | p->p_flag &= ~SVFDONE; | |
501 | } | |
e92a04af | 502 | for (i=0; i<NOFILE; i++) { |
29dd101b BJ |
503 | f = u.u_ofile[i]; |
504 | u.u_ofile[i] = NULL; | |
505 | closef(f); | |
506 | } | |
e92a04af | 507 | ilock(u.u_cdir); |
29dd101b BJ |
508 | iput(u.u_cdir); |
509 | if (u.u_rdir) { | |
e92a04af | 510 | ilock(u.u_rdir); |
29dd101b BJ |
511 | iput(u.u_rdir); |
512 | } | |
054016e1 | 513 | u.u_limit[LIM_FSIZE] = INFINITY; |
29dd101b BJ |
514 | acct(); |
515 | vrelpt(u.u_procp); | |
516 | vrelu(u.u_procp, 0); | |
517 | multprog--; | |
29dd101b | 518 | p->p_stat = SZOMB; |
42343c0f | 519 | noproc = 1; |
29dd101b BJ |
520 | i = PIDHASH(p->p_pid); |
521 | x = p - proc; | |
522 | if (pidhash[i] == x) | |
523 | pidhash[i] = p->p_idhash; | |
524 | else { | |
525 | for (i = pidhash[i]; i != 0; i = proc[i].p_idhash) | |
526 | if (proc[i].p_idhash == x) { | |
527 | proc[i].p_idhash = p->p_idhash; | |
528 | goto done; | |
529 | } | |
530 | panic("exit"); | |
531 | } | |
9c82b9fd BJ |
532 | if (p->p_pid == 1) |
533 | panic("init died"); | |
29dd101b BJ |
534 | done: |
535 | ((struct xproc *)p)->xp_xstat = rv; /* overlay */ | |
536 | ((struct xproc *)p)->xp_vm = u.u_vm; /* overlay */ | |
537 | vmsadd(&((struct xproc *)p)->xp_vm, &u.u_cvm); | |
e92a04af BJ |
538 | for (q = proc; q < procNPROC; q++) |
539 | if (q->p_pptr == p) { | |
bdfe5b0f | 540 | q->p_pptr = &proc[1]; |
29dd101b | 541 | q->p_ppid = 1; |
bdfe5b0f BJ |
542 | wakeup((caddr_t)&proc[1]); |
543 | /* | |
0dde1c43 | 544 | * Traced processes are killed |
bdfe5b0f | 545 | * since their existence means someone is screwing up. |
62bac59f | 546 | * Stopped processes are sent a hangup and a continue. |
0dde1c43 BJ |
547 | * This is designed to be ``safe'' for setuid |
548 | * processes since they must be willing to tolerate | |
549 | * hangups anyways. | |
bdfe5b0f | 550 | */ |
0dde1c43 | 551 | if (q->p_flag&STRC) { |
bdfe5b0f BJ |
552 | q->p_flag &= ~STRC; |
553 | psignal(q, SIGKILL); | |
0dde1c43 BJ |
554 | } else if (q->p_stat == SSTOP) { |
555 | psignal(q, SIGHUP); | |
556 | psignal(q, SIGCONT); | |
bdfe5b0f | 557 | } |
8643403f BJ |
558 | /* |
559 | * Protect this process from future | |
62bac59f BJ |
560 | * tty signals, clear TSTP/TTIN/TTOU if pending, |
561 | * and set SDETACH bit on procs. | |
8643403f | 562 | */ |
934e4ecf | 563 | (void) spgrp(q, -1); |
29dd101b | 564 | } |
bdfe5b0f BJ |
565 | wakeup((caddr_t)p->p_pptr); |
566 | psignal(p->p_pptr, SIGCHLD); | |
29dd101b BJ |
567 | swtch(); |
568 | } | |
569 | ||
570 | wait() | |
571 | { | |
bdfe5b0f BJ |
572 | struct vtimes vm; |
573 | struct vtimes *vp; | |
29dd101b | 574 | |
bdfe5b0f BJ |
575 | if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { |
576 | wait1(0, (struct vtimes *)0); | |
577 | return; | |
578 | } | |
579 | vp = (struct vtimes *)u.u_ar0[R1]; | |
580 | wait1(u.u_ar0[R0], &vm); | |
581 | if (u.u_error) | |
582 | return; | |
583 | (void) copyout((caddr_t)&vm, (caddr_t)vp, sizeof (struct vtimes)); | |
29dd101b BJ |
584 | } |
585 | ||
586 | /* | |
587 | * Wait system call. | |
588 | * Search for a terminated (zombie) child, | |
589 | * finally lay it to rest, and collect its status. | |
590 | * Look also for stopped (traced) children, | |
591 | * and pass back status from them. | |
592 | */ | |
bdfe5b0f BJ |
593 | wait1(options, vp) |
594 | register options; | |
29dd101b BJ |
595 | struct vtimes *vp; |
596 | { | |
597 | register f; | |
598 | register struct proc *p; | |
599 | ||
600 | f = 0; | |
29dd101b | 601 | loop: |
e92a04af BJ |
602 | for (p = proc; p < procNPROC; p++) |
603 | if (p->p_pptr == u.u_procp) { | |
29dd101b | 604 | f++; |
e92a04af | 605 | if (p->p_stat == SZOMB) { |
29dd101b BJ |
606 | u.u_r.r_val1 = p->p_pid; |
607 | u.u_r.r_val2 = ((struct xproc *)p)->xp_xstat; | |
608 | ((struct xproc *)p)->xp_xstat = 0; | |
609 | if (vp) | |
610 | *vp = ((struct xproc *)p)->xp_vm; | |
611 | vmsadd(&u.u_cvm, &((struct xproc *)p)->xp_vm); | |
612 | ((struct xproc *)p)->xp_vm = zvms; | |
613 | p->p_stat = NULL; | |
614 | p->p_pid = 0; | |
615 | p->p_ppid = 0; | |
bdfe5b0f | 616 | p->p_pptr = 0; |
29dd101b | 617 | p->p_sig = 0; |
bdfe5b0f BJ |
618 | p->p_siga0 = 0; |
619 | p->p_siga1 = 0; | |
29dd101b BJ |
620 | p->p_pgrp = 0; |
621 | p->p_flag = 0; | |
622 | p->p_wchan = 0; | |
bdfe5b0f | 623 | p->p_cursig = 0; |
29dd101b BJ |
624 | return; |
625 | } | |
bdfe5b0f BJ |
626 | if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 && |
627 | (p->p_flag&STRC || options&WUNTRACED)) { | |
628 | p->p_flag |= SWTED; | |
629 | u.u_r.r_val1 = p->p_pid; | |
630 | u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED; | |
631 | return; | |
29dd101b BJ |
632 | } |
633 | } | |
bdfe5b0f BJ |
634 | if (f==0) { |
635 | u.u_error = ECHILD; | |
636 | return; | |
637 | } | |
638 | if (options&WNOHANG) { | |
639 | u.u_r.r_val1 = 0; | |
640 | return; | |
641 | } | |
29a06346 | 642 | if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) { |
bdfe5b0f BJ |
643 | u.u_eosys = RESTARTSYS; |
644 | return; | |
29dd101b | 645 | } |
bdfe5b0f BJ |
646 | sleep((caddr_t)u.u_procp, PWAIT); |
647 | goto loop; | |
29dd101b BJ |
648 | } |
649 | ||
650 | /* | |
651 | * fork system call. | |
652 | */ | |
653 | fork() | |
654 | { | |
655 | ||
656 | u.u_cdmap = zdmap; | |
657 | u.u_csmap = zdmap; | |
658 | if (swpexpand(u.u_dsize, u.u_ssize, &u.u_cdmap, &u.u_csmap) == 0) { | |
659 | u.u_r.r_val2 = 0; | |
660 | return; | |
661 | } | |
662 | fork1(0); | |
663 | } | |
664 | ||
665 | fork1(isvfork) | |
666 | { | |
667 | register struct proc *p1, *p2; | |
668 | register a; | |
669 | ||
670 | a = 0; | |
671 | p2 = NULL; | |
e92a04af | 672 | for (p1 = proc; p1 < procNPROC; p1++) { |
29dd101b BJ |
673 | if (p1->p_stat==NULL && p2==NULL) |
674 | p2 = p1; | |
675 | else { | |
676 | if (p1->p_uid==u.u_uid && p1->p_stat!=NULL) | |
677 | a++; | |
678 | } | |
679 | } | |
680 | /* | |
681 | * Disallow if | |
682 | * No processes at all; | |
683 | * not su and too many procs owned; or | |
684 | * not su and would take last slot. | |
685 | */ | |
62901f34 BJ |
686 | if (p2==NULL) |
687 | tablefull("proc"); | |
86fd527f | 688 | if (p2==NULL || (u.u_uid!=0 && (p2==procNPROC-1 || a>MAXUPRC))) { |
29dd101b BJ |
689 | u.u_error = EAGAIN; |
690 | if (!isvfork) { | |
81263dba BJ |
691 | (void) vsexpand(0, &u.u_cdmap, 1); |
692 | (void) vsexpand(0, &u.u_csmap, 1); | |
29dd101b BJ |
693 | } |
694 | goto out; | |
695 | } | |
696 | p1 = u.u_procp; | |
e92a04af | 697 | if (newproc(isvfork)) { |
29dd101b BJ |
698 | u.u_r.r_val1 = p1->p_pid; |
699 | u.u_r.r_val2 = 1; /* child */ | |
700 | u.u_start = time; | |
701 | u.u_acflag = AFORK; | |
702 | return; | |
703 | } | |
704 | u.u_r.r_val1 = p2->p_pid; | |
705 | ||
706 | out: | |
707 | u.u_r.r_val2 = 0; | |
708 | } | |
709 | ||
710 | /* | |
711 | * break system call. | |
712 | * -- bad planning: "break" is a dirty word in C. | |
713 | */ | |
714 | sbreak() | |
715 | { | |
716 | struct a { | |
717 | char *nsiz; | |
718 | }; | |
719 | register int n, d; | |
720 | ||
721 | /* | |
722 | * set n to new data size | |
723 | * set d to new-old | |
724 | */ | |
725 | ||
726 | n = btoc(((struct a *)u.u_ap)->nsiz); | |
727 | if (!u.u_sep) | |
728 | n -= ctos(u.u_tsize) * stoc(1); | |
729 | if (n < 0) | |
730 | n = 0; | |
731 | d = clrnd(n - u.u_dsize); | |
5290ec92 | 732 | if (ctob(u.u_dsize+d) > u.u_limit[LIM_DATA]) { |
054016e1 BJ |
733 | u.u_error = ENOMEM; |
734 | return; | |
735 | } | |
29dd101b BJ |
736 | if (chksize(u.u_tsize, u.u_dsize+d, u.u_ssize)) |
737 | return; | |
738 | if (swpexpand(u.u_dsize+d, u.u_ssize, &u.u_dmap, &u.u_smap)==0) | |
739 | return; | |
740 | expand(d, P0BR); | |
741 | } |