Commit | Line | Data |
---|---|---|
a6b6f679 | 1 | /* sys_generic.c 5.10 82/08/14 */ |
ffe28cfe BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/dir.h" | |
6 | #include "../h/user.h" | |
7 | #include "../h/tty.h" | |
8 | #include "../h/file.h" | |
9 | #include "../h/inode.h" | |
10 | #include "../h/buf.h" | |
11 | #include "../h/proc.h" | |
12 | #include "../h/inline.h" | |
13 | #include "../h/conf.h" | |
14 | #include "../h/socket.h" | |
15 | #include "../h/socketvar.h" | |
16 | #include "../h/cmap.h" | |
17 | #include "../h/vlimit.h" | |
18 | #include "../h/fs.h" | |
cabdaec4 RE |
19 | #ifdef MUSH |
20 | #include "../h/quota.h" | |
21 | #include "../h/share.h" | |
22 | #else | |
23 | #define CHARGE(nothing) | |
24 | #endif | |
4147b3f6 | 25 | #include "../h/descrip.h" |
6fd40cea | 26 | #include "../h/uio.h" |
ffe28cfe BJ |
27 | |
28 | /* | |
29 | * Read system call. | |
30 | */ | |
31 | read() | |
32 | { | |
33 | register struct file *fp; | |
34 | register struct inode *ip; | |
35 | register struct a { | |
36 | int fdes; | |
37 | char *cbuf; | |
38 | unsigned count; | |
39 | } *uap; | |
32a43ee2 BJ |
40 | struct uio auio; |
41 | struct iovec aiov; | |
ffe28cfe BJ |
42 | |
43 | uap = (struct a *)u.u_ap; | |
44 | if ((int)uap->count < 0) { | |
45 | u.u_error = EINVAL; | |
46 | return; | |
47 | } | |
48 | GETF(fp, uap->fdes); | |
49 | if ((fp->f_flag&FREAD) == 0) { | |
50 | u.u_error = EBADF; | |
51 | return; | |
52 | } | |
32a43ee2 BJ |
53 | aiov.iov_base = (caddr_t)uap->cbuf; |
54 | aiov.iov_len = uap->count; | |
55 | auio.uio_iov = &aiov; | |
56 | auio.uio_iovcnt = 1; | |
57 | auio.uio_segflg = 0; | |
58 | auio.uio_resid = uap->count; | |
59 | u.u_base = (caddr_t)0xc0000000; | |
60 | u.u_count = 0x40000000; | |
ffe28cfe | 61 | if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) { |
32a43ee2 | 62 | if (auio.uio_resid == uap->count) |
ffe28cfe | 63 | u.u_eosys = RESTARTSYS; |
4147b3f6 | 64 | } else if (fp->f_type == DTYPE_SOCKET) |
32a43ee2 | 65 | u.u_error = soreceive(fp->f_socket, (struct sockaddr *)0, &auio); |
ffe28cfe BJ |
66 | else { |
67 | ip = fp->f_inode; | |
32a43ee2 | 68 | auio.uio_offset = fp->f_offset; |
ffe28cfe BJ |
69 | if ((ip->i_mode&IFMT) == IFREG) { |
70 | ilock(ip); | |
32a43ee2 | 71 | u.u_error = readip(ip, &auio); |
ffe28cfe BJ |
72 | iunlock(ip); |
73 | } else | |
32a43ee2 BJ |
74 | u.u_error = readip(ip, &auio); |
75 | fp->f_offset += uap->count - auio.uio_resid; | |
ffe28cfe | 76 | } |
32a43ee2 | 77 | u.u_r.r_val1 = uap->count - auio.uio_resid; |
ffe28cfe BJ |
78 | } |
79 | ||
80 | /* | |
81 | * Write system call | |
82 | */ | |
83 | write() | |
84 | { | |
85 | register struct file *fp; | |
86 | register struct inode *ip; | |
87 | register struct a { | |
88 | int fdes; | |
89 | char *cbuf; | |
90 | unsigned count; | |
91 | } *uap; | |
92 | ||
93 | uap = (struct a *)u.u_ap; | |
94 | if ((int)uap->count < 0) { | |
95 | u.u_error = EINVAL; | |
96 | return; | |
97 | } | |
98 | GETF(fp, uap->fdes); | |
99 | if ((fp->f_flag&FWRITE) == 0) { | |
100 | u.u_error = EBADF; | |
101 | return; | |
102 | } | |
103 | u.u_base = (caddr_t)uap->cbuf; | |
104 | u.u_count = uap->count; | |
105 | u.u_segflg = 0; | |
106 | if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) { | |
107 | if (u.u_count == uap->count) | |
108 | u.u_eosys = RESTARTSYS; | |
4147b3f6 | 109 | } else if (fp->f_type == DTYPE_SOCKET) |
ffe28cfe BJ |
110 | u.u_error = sosend(fp->f_socket, (struct sockaddr *)0); |
111 | else { | |
112 | ip = fp->f_inode; | |
68c9244a | 113 | if (fp->f_flag&FAPPEND) |
4147b3f6 | 114 | fp->f_offset = ip->i_size; |
ffe28cfe BJ |
115 | u.u_offset = fp->f_offset; |
116 | if ((ip->i_mode&IFMT) == IFREG) { | |
117 | ilock(ip); | |
118 | writei(ip); | |
119 | iunlock(ip); | |
120 | } else | |
121 | writei(ip); | |
122 | fp->f_offset += uap->count - u.u_count; | |
123 | } | |
124 | u.u_r.r_val1 = uap->count - u.u_count; | |
125 | } | |
126 | ||
4147b3f6 BJ |
127 | readv() |
128 | { | |
129 | ||
130 | } | |
131 | ||
132 | writev() | |
133 | { | |
134 | ||
135 | } | |
ffe28cfe BJ |
136 | |
137 | /* | |
138 | * Ioctl system call | |
4b72e2f9 SL |
139 | * Check legality, execute common code, |
140 | * and switch out to individual device routine. | |
ffe28cfe BJ |
141 | */ |
142 | ioctl() | |
143 | { | |
144 | register struct file *fp; | |
4b72e2f9 | 145 | struct a { |
ffe28cfe BJ |
146 | int fdes; |
147 | int cmd; | |
148 | caddr_t cmarg; | |
149 | } *uap; | |
4b72e2f9 SL |
150 | register int com, size; |
151 | char data[IOCPARM_MASK+1]; | |
ffe28cfe BJ |
152 | |
153 | uap = (struct a *)u.u_ap; | |
154 | if ((fp = getf(uap->fdes)) == NULL) | |
155 | return; | |
156 | if ((fp->f_flag & (FREAD|FWRITE)) == 0) { | |
157 | u.u_error = EBADF; | |
158 | return; | |
159 | } | |
4b72e2f9 SL |
160 | com = uap->cmd; |
161 | ||
68c9244a | 162 | #ifndef NOCOMPAT |
4b72e2f9 SL |
163 | /* |
164 | * Map old style ioctl's into new for the | |
165 | * sake of backwards compatibility (sigh). | |
166 | */ | |
167 | if ((com&~0xffff) == 0) { | |
168 | com = mapioctl(com); | |
169 | if (com == 0) { | |
170 | u.u_error = EINVAL; | |
171 | return; | |
172 | } | |
173 | } | |
174 | #endif | |
175 | if (com == FIOCLEX) { | |
ffe28cfe BJ |
176 | u.u_pofile[uap->fdes] |= EXCLOSE; |
177 | return; | |
178 | } | |
4b72e2f9 | 179 | if (com == FIONCLEX) { |
ffe28cfe BJ |
180 | u.u_pofile[uap->fdes] &= ~EXCLOSE; |
181 | return; | |
182 | } | |
4b72e2f9 SL |
183 | |
184 | /* | |
185 | * Interpret high order word to find | |
186 | * amount of data to be copied to/from the | |
187 | * user's address space. | |
188 | * (this'll have to change if we have in+out ioctls) | |
189 | */ | |
190 | size = (com &~ (IOC_INOUT|IOC_VOID)) >> 16; | |
191 | if (size > sizeof (data)) { | |
192 | u.u_error = EFAULT; | |
ffe28cfe BJ |
193 | return; |
194 | } | |
68c9244a | 195 | if (com&IOC_IN && size) { |
4b72e2f9 SL |
196 | if (copyin(uap->cmarg, (caddr_t)data, size)) { |
197 | u.u_error = EFAULT; | |
ffe28cfe | 198 | return; |
4b72e2f9 SL |
199 | } |
200 | } else | |
201 | *(caddr_t *)data = uap->cmarg; | |
202 | /* | |
203 | * Zero the buffer on the stack so the user | |
204 | * always gets back something deterministic. | |
205 | */ | |
206 | if ((com&IOC_OUT) && size) | |
207 | bzero((caddr_t)data, size); | |
208 | ||
209 | if (fp->f_type == DTYPE_SOCKET) | |
210 | soioctl(fp->f_socket, com, data); | |
211 | else { | |
212 | register struct inode *ip = fp->f_inode; | |
213 | int fmt = ip->i_mode & IFMT; | |
214 | dev_t dev; | |
215 | ||
216 | if (fmt != IFCHR) { | |
217 | if (com == FIONREAD && (fmt == IFREG || fmt == IFDIR)) { | |
218 | *(off_t *)data = ip->i_size - fp->f_offset; | |
219 | goto returndata; | |
220 | } | |
221 | if (com != FIONBIO && com != FIOASYNC) | |
222 | u.u_error = ENOTTY; | |
223 | return; | |
224 | } | |
225 | dev = ip->i_rdev; | |
226 | u.u_r.r_val1 = 0; | |
227 | if ((u.u_procp->p_flag&SNUSIG) && setjmp(u.u_qsav)) { | |
228 | u.u_eosys = RESTARTSYS; | |
229 | return; | |
230 | } | |
231 | (*cdevsw[major(dev)].d_ioctl)(dev, com, data, 0); | |
ffe28cfe | 232 | } |
4b72e2f9 SL |
233 | |
234 | returndata: | |
235 | /* | |
236 | * Copy any data to user, size was | |
237 | * already set and checked above. | |
238 | */ | |
68c9244a SL |
239 | if (u.u_error == 0 && com&IOC_OUT) |
240 | if (size && copyout(data, uap->cmarg, size)) | |
241 | u.u_error = EFAULT; | |
ffe28cfe BJ |
242 | } |
243 | ||
244 | /* | |
245 | * Do nothing specific version of line | |
246 | * discipline specific ioctl command. | |
247 | */ | |
248 | /*ARGSUSED*/ | |
4b72e2f9 | 249 | nullioctl(tp, cmd, data, flags) |
ffe28cfe | 250 | struct tty *tp; |
4b72e2f9 SL |
251 | char *data; |
252 | int flags; | |
ffe28cfe BJ |
253 | { |
254 | ||
4b72e2f9 SL |
255 | #ifdef lint |
256 | tp = tp; data = data; flags = flags; | |
257 | #endif | |
ffe28cfe BJ |
258 | return (cmd); |
259 | } | |
260 | ||
ffe28cfe BJ |
261 | /* |
262 | * Write the file corresponding to | |
263 | * the inode pointed at by the argument. | |
264 | * The actual write arguments are found | |
265 | * in the variables: | |
266 | * u_base core address for source | |
267 | * u_offset byte offset in file | |
268 | * u_count number of bytes to write | |
269 | * u_segflg write to kernel/user/user I | |
270 | */ | |
271 | writei(ip) | |
272 | register struct inode *ip; | |
273 | { | |
274 | struct buf *bp; | |
275 | register struct fs *fs; | |
276 | dev_t dev; | |
277 | daddr_t lbn, bn; | |
278 | register int on, type; | |
279 | register unsigned n; | |
280 | long bsize; | |
281 | int size, i, count; | |
282 | extern int mem_no; | |
283 | ||
284 | dev = (dev_t)ip->i_rdev; | |
285 | if (u.u_offset < 0 && ((ip->i_mode&IFMT) != IFCHR || | |
286 | mem_no != major(dev)) ) { | |
287 | u.u_error = EINVAL; | |
288 | return; | |
289 | } | |
290 | type = ip->i_mode & IFMT; | |
291 | if (type == IFCHR) { | |
292 | ip->i_flag |= IUPD|ICHG; | |
cabdaec4 | 293 | CHARGE(sc_tio * u.u_count); |
ffe28cfe BJ |
294 | (*cdevsw[major(dev)].d_write)(dev); |
295 | return; | |
296 | } | |
297 | if (u.u_count == 0) | |
298 | return; | |
299 | if ((ip->i_mode & IFMT) == IFREG && | |
300 | u.u_offset + u.u_count > u.u_limit[LIM_FSIZE]) { | |
301 | psignal(u.u_procp, SIGXFSZ); | |
302 | u.u_error = EMFILE; | |
303 | return; | |
304 | } | |
305 | if (type!=IFBLK) { | |
306 | dev = ip->i_dev; | |
307 | fs = ip->i_fs; | |
308 | bsize = fs->fs_bsize; | |
323f251c | 309 | } else |
ffe28cfe | 310 | bsize = BLKDEV_IOSIZE; |
ffe28cfe BJ |
311 | do { |
312 | lbn = u.u_offset / bsize; | |
313 | on = u.u_offset % bsize; | |
314 | n = MIN((unsigned)(bsize - on), u.u_count); | |
315 | if (type != IFBLK) { | |
316 | bn = fsbtodb(fs, bmap(ip, lbn, B_WRITE, (int)(on + n))); | |
323f251c | 317 | if (u.u_error || (long)bn<0) |
ffe28cfe BJ |
318 | return; |
319 | if(u.u_offset + n > ip->i_size && | |
320 | (type == IFDIR || type == IFREG || type == IFLNK)) | |
321 | ip->i_size = u.u_offset + n; | |
322 | size = blksize(fs, ip, lbn); | |
323 | } else { | |
324 | size = bsize; | |
325 | bn = lbn * (BLKDEV_IOSIZE/DEV_BSIZE); | |
326 | } | |
323f251c BJ |
327 | count = howmany(size, DEV_BSIZE); |
328 | for (i = 0; i < count; i += CLSIZE) | |
329 | if (mfind(dev, bn + i)) | |
330 | munhash(dev, bn + i); | |
331 | if (n == bsize) | |
ffe28cfe BJ |
332 | bp = getblk(dev, bn, size); |
333 | else | |
334 | bp = bread(dev, bn, size); | |
ffe28cfe BJ |
335 | if (u.u_segflg != 1) { |
336 | if (copyin(u.u_base, bp->b_un.b_addr + on, n)) { | |
337 | u.u_error = EFAULT; | |
338 | goto bad; | |
339 | } | |
340 | } else | |
341 | bcopy(u.u_base, bp->b_un.b_addr + on, n); | |
342 | u.u_base += n; | |
343 | u.u_offset += n; | |
344 | u.u_count -= n; | |
345 | bad: | |
346 | ; | |
ffe28cfe BJ |
347 | if (u.u_error != 0) |
348 | brelse(bp); | |
349 | else { | |
350 | if ((ip->i_mode&IFMT) == IFDIR) | |
351 | /* | |
352 | * Writing to clear a directory entry. | |
353 | * Must insure the write occurs before | |
354 | * the inode is freed, or may end up | |
355 | * pointing at a new (different) file | |
356 | * if inode is quickly allocated again | |
357 | * and system crashes. | |
358 | */ | |
359 | bwrite(bp); | |
360 | else if (n + on == bsize) { | |
361 | bp->b_flags |= B_AGE; | |
362 | bawrite(bp); | |
363 | } else | |
364 | bdwrite(bp); | |
365 | } | |
366 | ip->i_flag |= IUPD|ICHG; | |
367 | if (u.u_ruid != 0) | |
368 | ip->i_mode &= ~(ISUID|ISGID); | |
369 | } while (u.u_error == 0 && u.u_count != 0); | |
370 | } | |
371 | ||
372 | /* | |
373 | * Move n bytes at byte location | |
374 | * &bp->b_un.b_addr[o] to/from (flag) the | |
375 | * user/kernel (u.segflg) area starting at u.base. | |
376 | * Update all the arguments by the number | |
377 | * of bytes moved. | |
378 | */ | |
379 | iomove(cp, n, flag) | |
380 | register caddr_t cp; | |
381 | register unsigned n; | |
382 | { | |
383 | register int t; | |
384 | ||
385 | if (n==0) | |
386 | return; | |
387 | if (u.u_segflg != 1) { | |
388 | if (flag==B_WRITE) | |
389 | t = copyin(u.u_base, (caddr_t)cp, n); | |
390 | else | |
391 | t = copyout((caddr_t)cp, u.u_base, n); | |
392 | if (t) { | |
393 | u.u_error = EFAULT; | |
394 | return; | |
395 | } | |
396 | } else | |
397 | if (flag == B_WRITE) | |
398 | bcopy(u.u_base, (caddr_t)cp, n); | |
399 | else | |
400 | bcopy((caddr_t)cp, u.u_base, n); | |
401 | u.u_base += n; | |
402 | u.u_offset += n; | |
403 | u.u_count -= n; | |
404 | } | |
6fd40cea | 405 | |
a6b6f679 BJ |
406 | readip1(ip, base, len, offset, segflg, aresid) |
407 | struct inode *ip; | |
408 | caddr_t base; | |
409 | int len, offset, segflg; | |
410 | int *aresid; | |
411 | { | |
412 | struct uio auio; | |
413 | struct iovec aiov; | |
414 | int error; | |
415 | ||
416 | auio.uio_iov = &aiov; | |
417 | auio.uio_iovcnt = 1; | |
418 | aiov.iov_base = base; | |
419 | aiov.iov_len = len; | |
420 | auio.uio_resid = len; | |
421 | auio.uio_offset = offset; | |
422 | auio.uio_segflg = segflg; | |
423 | error = readip(ip, &auio); | |
424 | if (aresid) | |
425 | *aresid = auio.uio_resid; | |
426 | else | |
427 | if (auio.uio_resid) | |
428 | error = EIO; | |
429 | return (error); | |
430 | } | |
431 | ||
6fd40cea BJ |
432 | readip(ip, uio) |
433 | register struct inode *ip; | |
434 | register struct uio *uio; | |
435 | { | |
32a43ee2 | 436 | register struct iovec *iov; |
6fd40cea BJ |
437 | struct buf *bp; |
438 | struct fs *fs; | |
439 | dev_t dev; | |
440 | daddr_t lbn, bn; | |
441 | off_t diff; | |
442 | register int on, type; | |
443 | register unsigned n; | |
444 | int size; | |
445 | long bsize; | |
446 | extern int mem_no; | |
447 | int error = 0; | |
448 | ||
6fd40cea BJ |
449 | dev = (dev_t)ip->i_rdev; |
450 | if (uio->uio_offset < 0 && | |
32a43ee2 BJ |
451 | ((ip->i_mode&IFMT) != IFCHR || mem_no != major(dev))) |
452 | return (EINVAL); | |
6fd40cea BJ |
453 | ip->i_flag |= IACC; |
454 | type = ip->i_mode&IFMT; | |
455 | if (type == IFCHR) { | |
456 | register c = u.u_count; | |
32a43ee2 BJ |
457 | (*cdevsw[major(dev)].d_read)(dev, uio); |
458 | CHARGE(sc_tio * (c - uio->uio_resid)); | |
459 | return (u.u_error); | |
6fd40cea BJ |
460 | } |
461 | if (type != IFBLK) { | |
462 | dev = ip->i_dev; | |
463 | fs = ip->i_fs; | |
464 | bsize = fs->fs_bsize; | |
465 | } else | |
466 | bsize = BLKDEV_IOSIZE; | |
467 | nextiov: | |
468 | if (uio->uio_iovcnt == 0) | |
32a43ee2 BJ |
469 | return (0); |
470 | iov = uio->uio_iov; | |
6fd40cea BJ |
471 | if (iov->iov_len > 0) |
472 | do { | |
473 | lbn = uio->uio_offset / bsize; | |
474 | on = uio->uio_offset % bsize; | |
475 | n = MIN((unsigned)(bsize - on), iov->iov_len); | |
476 | if (type != IFBLK) { | |
477 | diff = ip->i_size - uio->uio_offset; | |
478 | if (diff <= 0) | |
479 | return; | |
480 | if (diff < n) | |
481 | n = diff; | |
482 | bn = fsbtodb(fs, bmap(ip, lbn, B_READ)); | |
483 | if (u.u_error) | |
32a43ee2 | 484 | return (u.u_error); |
6fd40cea BJ |
485 | size = blksize(fs, ip, lbn); |
486 | } else { | |
487 | size = bsize; | |
488 | bn = lbn * (BLKDEV_IOSIZE/DEV_BSIZE); | |
489 | rablock = bn + (BLKDEV_IOSIZE/DEV_BSIZE); | |
490 | rasize = bsize; | |
491 | } | |
492 | if ((long)bn<0) { | |
493 | bp = geteblk(size); | |
494 | clrbuf(bp); | |
495 | } else if (ip->i_lastr + 1 == lbn) | |
496 | bp = breada(dev, bn, size, rablock, rasize); | |
497 | else | |
498 | bp = bread(dev, bn, size); | |
499 | ip->i_lastr = lbn; | |
500 | n = MIN(n, size - bp->b_resid); | |
501 | if (n != 0) { | |
502 | if (uio->uio_segflg != 1) { | |
503 | if (copyout(bp->b_un.b_addr+on, iov->iov_base, n)) { | |
32a43ee2 BJ |
504 | brelse(bp); |
505 | return (EFAULT); | |
6fd40cea BJ |
506 | } |
507 | } else | |
508 | bcopy(bp->b_un.b_addr + on, iov->iov_base, n); | |
509 | iov->iov_base += n; | |
510 | uio->uio_offset += n; | |
511 | iov->iov_len -= n; | |
32a43ee2 | 512 | uio->uio_resid -= n; |
6fd40cea BJ |
513 | } |
514 | if (n + on == bsize || uio->uio_offset == ip->i_size) | |
515 | bp->b_flags |= B_AGE; | |
516 | brelse(bp); | |
517 | } while (u.u_error == 0 && iov->iov_len != 0 && n != 0); | |
32a43ee2 BJ |
518 | if (u.u_error == 0 && iov->iov_len == 0) { |
519 | uio->uio_iov++; | |
6fd40cea BJ |
520 | uio->uio_iovcnt--; |
521 | goto nextiov; | |
522 | } | |
6fd40cea BJ |
523 | return (error); |
524 | } | |
32a43ee2 BJ |
525 | |
526 | uiomove(cp, n, dir, uio) | |
527 | register caddr_t cp; | |
528 | register unsigned n; | |
529 | enum uio_direction dir; | |
530 | struct uio *uio; | |
531 | { | |
532 | register struct iovec *iov; | |
533 | int bad, cnt; | |
534 | ||
535 | if (n == 0) | |
536 | return (0); | |
537 | if (uio->uio_segflg != 1) { | |
538 | if (dir == UIO_READFROM) | |
539 | #ifdef notdef | |
540 | bad = copyuin(uio, (caddr_t)cp, n); | |
541 | #else | |
542 | panic("uiomove"); | |
543 | #endif | |
544 | else | |
545 | bad = copyuout((caddr_t)cp, n, uio); | |
546 | if (bad) | |
547 | return (EFAULT); | |
548 | } else { | |
549 | while (n > 0 && uio->uio_iovcnt) { | |
550 | iov = uio->uio_iov; | |
551 | cnt = iov->iov_len; | |
552 | if (cnt > n) | |
553 | cnt = n; | |
554 | if (dir == UIO_READFROM) | |
555 | bcopy(iov->iov_base, (caddr_t)cp, cnt); | |
556 | else | |
557 | bcopy((caddr_t)cp, iov->iov_base, cnt); | |
558 | iov->iov_base += cnt; | |
559 | iov->iov_len -= cnt; | |
560 | uio->uio_resid -= cnt; | |
561 | n -= cnt; | |
562 | } | |
563 | } | |
564 | return (0); | |
565 | } |