1 /* sys_generic.c 5.22 82/11/13 */ 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 #define IDEBUG 10 #include "../h/inode.h" 11 #include "../h/buf.h" 12 #include "../h/proc.h" 13 #include "../h/conf.h" 14 #include "../h/socket.h" 15 #include "../h/socketvar.h" 16 #include "../h/fs.h" 17 #ifdef MUSH 18 #include "../h/quota.h" 19 #include "../h/share.h" 20 #else 21 #define CHARGE(nothing) 22 #endif 23 #include "../h/descrip.h" 24 #include "../h/uio.h" 25 #include "../h/cmap.h" 26 27 /* 28 * Read system call. 29 */ 30 read() 31 { 32 register struct a { 33 int fdes; 34 char *cbuf; 35 unsigned count; 36 } *uap = (struct a *)u.u_ap; 37 struct uio auio; 38 struct iovec aiov; 39 40 aiov.iov_base = (caddr_t)uap->cbuf; 41 aiov.iov_len = uap->count; 42 auio.uio_iov = &aiov; 43 auio.uio_iovcnt = 1; 44 rwuio(&auio, UIO_READ); 45 } 46 47 readv() 48 { 49 register struct a { 50 int fdes; 51 struct iovec *iovp; 52 int iovcnt; 53 } *uap = (struct a *)u.u_ap; 54 struct uio auio; 55 struct iovec aiov[16]; /* XXX */ 56 57 if (uap->iovcnt <= 0 || uap->iovcnt > sizeof(aiov)/sizeof(aiov[0])) { 58 u.u_error = EINVAL; 59 return; 60 } 61 auio.uio_iov = aiov; 62 auio.uio_iovcnt = uap->iovcnt; 63 if (copyin((caddr_t)uap->iovp, (caddr_t)aiov, 64 (unsigned)(uap->iovcnt * sizeof (struct iovec)))) { 65 u.u_error = EFAULT; 66 return; 67 } 68 rwuio(&auio, UIO_READ); 69 } 70 71 /* 72 * Write system call 73 */ 74 write() 75 { 76 register struct a { 77 int fdes; 78 char *cbuf; 79 int count; 80 } *uap = (struct a *)u.u_ap; 81 struct uio auio; 82 struct iovec aiov; 83 84 auio.uio_iov = &aiov; 85 auio.uio_iovcnt = 1; 86 aiov.iov_base = uap->cbuf; 87 aiov.iov_len = uap->count; 88 rwuio(&auio, UIO_WRITE); 89 } 90 91 writev() 92 { 93 register struct a { 94 int fdes; 95 struct iovec *iovp; 96 int iovcnt; 97 } *uap = (struct a *)u.u_ap; 98 struct uio auio; 99 struct iovec aiov[16]; /* XXX */ 100 101 if (uap->iovcnt <= 0 || uap->iovcnt > sizeof(aiov)/sizeof(aiov[0])) { 102 u.u_error = EINVAL; 103 return; 104 } 105 auio.uio_iov = aiov; 106 auio.uio_iovcnt = uap->iovcnt; 107 if (copyin((caddr_t)uap->iovp, (caddr_t)aiov, 108 (unsigned)(uap->iovcnt * sizeof (struct iovec)))) { 109 u.u_error = EFAULT; 110 return; 111 } 112 rwuio(&auio, UIO_WRITE); 113 } 114 115 rwuio(uio, rw) 116 register struct uio *uio; 117 enum uio_rw rw; 118 { 119 struct a { 120 int fdes; 121 }; 122 register struct file *fp; 123 register struct iovec *iov; 124 register struct inode *ip; 125 int i, count; 126 127 GETF(fp, ((struct a *)u.u_ap)->fdes); 128 if ((fp->f_flag&(rw==UIO_READ ? FREAD : FWRITE)) == 0) { 129 u.u_error = EBADF; 130 return; 131 } 132 uio->uio_resid = 0; 133 uio->uio_segflg = 0; 134 iov = uio->uio_iov; 135 for (i = 0; i < uio->uio_iovcnt; i++) { 136 if (iov->iov_len < 0) { 137 u.u_error = EINVAL; 138 return; 139 } 140 uio->uio_resid += iov->iov_len; 141 if (uio->uio_resid < 0) { 142 u.u_error = EINVAL; 143 return; 144 } 145 } 146 count = uio->uio_resid; 147 if ((u.u_procp->p_flag&SNUSIG) && setjmp(&u.u_qsave)) { 148 if (uio->uio_resid == count) 149 u.u_eosys = RESTARTSYS; 150 } else if (fp->f_type == DTYPE_SOCKET) { 151 int sosend(), soreceive(); 152 u.u_error = 153 (*(rw==UIO_READ?soreceive:sosend)) 154 (fp->f_socket, (struct sockaddr *)0, uio, 0); 155 } else { 156 ip = fp->f_inode; 157 uio->uio_offset = fp->f_offset; 158 if ((ip->i_mode&IFMT) == IFREG) { 159 ILOCK(ip); 160 u.u_error = rwip(ip, uio, rw); 161 IUNLOCK(ip); 162 } else 163 u.u_error = rwip(ip, uio, rw); 164 fp->f_offset += count - uio->uio_resid; 165 } 166 u.u_r.r_val1 = count - uio->uio_resid; 167 } 168 169 rdwri(rw, ip, base, len, offset, segflg, aresid) 170 struct inode *ip; 171 caddr_t base; 172 int len, offset, segflg; 173 int *aresid; 174 enum uio_rw rw; 175 { 176 struct uio auio; 177 struct iovec aiov; 178 int error; 179 180 auio.uio_iov = &aiov; 181 auio.uio_iovcnt = 1; 182 aiov.iov_base = base; 183 aiov.iov_len = len; 184 auio.uio_resid = len; 185 auio.uio_offset = offset; 186 auio.uio_segflg = segflg; 187 error = rwip(ip, &auio, rw); 188 if (aresid) 189 *aresid = auio.uio_resid; 190 else 191 if (auio.uio_resid) 192 error = EIO; 193 return (error); 194 } 195 196 rwip(ip, uio, rw) 197 register struct inode *ip; 198 register struct uio *uio; 199 enum uio_rw rw; 200 { 201 dev_t dev = (dev_t)ip->i_rdev; 202 struct buf *bp; 203 struct fs *fs; 204 daddr_t lbn, bn; 205 register int n, on, type; 206 int size; 207 long bsize; 208 extern int mem_no; 209 int error = 0; 210 211 if (rw != UIO_READ && rw != UIO_WRITE) 212 panic("rwip"); 213 if (uio->uio_offset < 0 && 214 ((ip->i_mode&IFMT) != IFCHR || mem_no != major(dev))) 215 return (EINVAL); 216 if (rw == UIO_READ) 217 ip->i_flag |= IACC; 218 type = ip->i_mode&IFMT; 219 if (type == IFCHR) { 220 #ifdef QUOTA 221 register c = uio->uio_resid; 222 #endif 223 if (rw == UIO_READ) 224 u.u_error = (*cdevsw[major(dev)].d_read)(dev, uio); 225 else { 226 ip->i_flag |= IUPD|ICHG; 227 u.u_error = (*cdevsw[major(dev)].d_write)(dev, uio); 228 } 229 CHARGE(sc_tio * (c - uio->uio_resid)); 230 return (u.u_error); 231 } 232 if (uio->uio_resid == 0) 233 return; 234 if (rw == UIO_WRITE && type == IFREG && 235 uio->uio_offset + uio->uio_resid > 236 u.u_rlimit[RLIMIT_FSIZE].rlim_cur) { 237 psignal(u.u_procp, SIGXFSZ); 238 return (EMFILE); 239 } 240 if (type != IFBLK) { 241 dev = ip->i_dev; 242 fs = ip->i_fs; 243 bsize = fs->fs_bsize; 244 } else 245 bsize = BLKDEV_IOSIZE; 246 do { 247 lbn = uio->uio_offset / bsize; 248 on = uio->uio_offset % bsize; 249 n = MIN((unsigned)(bsize - on), uio->uio_resid); 250 if (type != IFBLK) { 251 if (rw == UIO_READ) { 252 int diff = ip->i_size - uio->uio_offset; 253 if (diff <= 0) 254 return (0); 255 if (diff < n) 256 n = diff; 257 } 258 bn = fsbtodb(fs, 259 bmap(ip, lbn, rw == UIO_WRITE ? B_WRITE: B_READ, (int)(on+n))); 260 if (u.u_error || rw == UIO_WRITE && (long)bn<0) 261 return (u.u_error); 262 if (rw == UIO_WRITE && uio->uio_offset + n > ip->i_size && 263 (type == IFDIR || type == IFREG || type == IFLNK)) 264 ip->i_size = uio->uio_offset + n; 265 size = blksize(fs, ip, lbn); 266 } else { 267 bn = lbn * (BLKDEV_IOSIZE/DEV_BSIZE); 268 rablock = bn + (BLKDEV_IOSIZE/DEV_BSIZE); 269 rasize = size = bsize; 270 } 271 if (rw == UIO_READ) { 272 if ((long)bn<0) { 273 bp = geteblk(size); 274 clrbuf(bp); 275 } else if (ip->i_lastr + 1 == lbn) 276 bp = breada(dev, bn, size, rablock, rasize); 277 else 278 bp = bread(dev, bn, size); 279 ip->i_lastr = lbn; 280 } else { 281 int i, count; 282 extern struct cmap *mfind(); 283 284 count = howmany(size, DEV_BSIZE); 285 for (i = 0; i < count; i += CLSIZE) 286 if (mfind(dev, bn + i)) 287 munhash(dev, bn + i); 288 if (n == bsize) 289 bp = getblk(dev, bn, size); 290 else 291 bp = bread(dev, bn, size); 292 } 293 n = MIN(n, size - bp->b_resid); 294 if (bp->b_flags & B_ERROR) { 295 error = EIO; 296 brelse(bp); 297 goto bad; 298 } 299 u.u_error = 300 uiomove(bp->b_un.b_addr+on, n, rw, uio); 301 if (rw == UIO_READ) { 302 if (n + on == bsize || uio->uio_offset == ip->i_size) 303 bp->b_flags |= B_AGE; 304 brelse(bp); 305 } else { 306 if ((ip->i_mode&IFMT) == IFDIR) 307 bwrite(bp); 308 else if (n + on == bsize) { 309 bp->b_flags |= B_AGE; 310 bawrite(bp); 311 } else 312 bdwrite(bp); 313 ip->i_flag |= IUPD|ICHG; 314 if (u.u_ruid != 0) 315 ip->i_mode &= ~(ISUID|ISGID); 316 } 317 } while (u.u_error == 0 && uio->uio_resid > 0 && n != 0); 318 bad: 319 return (error); 320 } 321 322 uiomove(cp, n, rw, uio) 323 register caddr_t cp; 324 register int n; 325 enum uio_rw rw; 326 register struct uio *uio; 327 { 328 register struct iovec *iov; 329 int error; 330 u_int cnt; 331 332 while (n > 0 && uio->uio_resid) { 333 iov = uio->uio_iov; 334 cnt = iov->iov_len; 335 if (cnt == 0) { 336 uio->uio_iov++; 337 uio->uio_iovcnt--; 338 continue; 339 } 340 if (cnt > n) 341 cnt = n; 342 switch (uio->uio_segflg) { 343 344 case 0: 345 case 2: 346 if (rw == UIO_READ) 347 error = copyout(cp, iov->iov_base, cnt); 348 else 349 error = copyin(iov->iov_base, cp, cnt); 350 if (error) 351 return (error); 352 break; 353 354 case 1: 355 if (rw == UIO_READ) 356 bcopy((caddr_t)cp, iov->iov_base, cnt); 357 else 358 bcopy(iov->iov_base, (caddr_t)cp, cnt); 359 break; 360 } 361 iov->iov_base += cnt; 362 iov->iov_len -= cnt; 363 uio->uio_resid -= cnt; 364 uio->uio_offset += cnt; 365 cp += cnt; 366 n -= cnt; 367 } 368 return (error); 369 } 370 371 /* 372 * Give next character to user as result of read. 373 */ 374 ureadc(c, uio) 375 register int c; 376 register struct uio *uio; 377 { 378 register struct iovec *iov; 379 380 again: 381 if (uio->uio_iovcnt == 0) 382 panic("ureadc"); 383 iov = uio->uio_iov; 384 if (iov->iov_len <= 0 || uio->uio_resid <= 0) { 385 uio->uio_iovcnt--; 386 uio->uio_iov++; 387 goto again; 388 } 389 switch (uio->uio_segflg) { 390 391 case 0: 392 if (subyte(iov->iov_base, c) < 0) 393 return (EFAULT); 394 break; 395 396 case 1: 397 *iov->iov_base = c; 398 break; 399 400 case 2: 401 if (suibyte(iov->iov_base, c) < 0) 402 return (EFAULT); 403 break; 404 } 405 iov->iov_base++; 406 iov->iov_len--; 407 uio->uio_resid--; 408 uio->uio_offset++; 409 return (0); 410 } 411 412 #ifdef notdef 413 /* 414 * Get next character written in by user from uio. 415 */ 416 uwritec(uio) 417 struct uio *uio; 418 { 419 register struct iovec *iov; 420 register int c; 421 422 again: 423 if (uio->uio_iovcnt <= 0 || uio->uio_resid <= 0) 424 panic("uwritec"); 425 iov = uio->uio_iov; 426 if (iov->iov_len == 0) { 427 uio->uio_iovcnt--; 428 uio->uio_iov++; 429 goto again; 430 } 431 switch (uio->uio_segflg) { 432 433 case 0: 434 c = fubyte(iov->iov_base); 435 break; 436 437 case 1: 438 c = *iov->iov_base & 0377; 439 break; 440 441 case 2: 442 c = fuibyte(iov->iov_base); 443 break; 444 } 445 if (c < 0) 446 return (-1); 447 iov->iov_base++; 448 iov->iov_len--; 449 uio->uio_resid--; 450 uio->uio_offset++; 451 return (c & 0377); 452 } 453 #endif 454 455 /* 456 * Ioctl system call 457 * Check legality, execute common code, 458 * and switch out to individual device routine. 459 */ 460 ioctl() 461 { 462 register struct file *fp; 463 struct a { 464 int fdes; 465 int cmd; 466 caddr_t cmarg; 467 } *uap; 468 register int com; 469 register u_int size; 470 char data[IOCPARM_MASK+1]; 471 472 uap = (struct a *)u.u_ap; 473 if ((fp = getf(uap->fdes)) == NULL) 474 return; 475 if ((fp->f_flag & (FREAD|FWRITE)) == 0) { 476 u.u_error = EBADF; 477 return; 478 } 479 com = uap->cmd; 480 481 #ifndef NOCOMPAT 482 /* 483 * Map old style ioctl's into new for the 484 * sake of backwards compatibility (sigh). 485 */ 486 if ((com&~0xffff) == 0) { 487 com = mapioctl(com); 488 if (com == 0) { 489 u.u_error = EINVAL; 490 return; 491 } 492 } 493 #endif 494 if (com == FIOCLEX) { 495 u.u_pofile[uap->fdes] |= EXCLOSE; 496 return; 497 } 498 if (com == FIONCLEX) { 499 u.u_pofile[uap->fdes] &= ~EXCLOSE; 500 return; 501 } 502 503 /* 504 * Interpret high order word to find 505 * amount of data to be copied to/from the 506 * user's address space. 507 */ 508 size = (com &~ (IOC_INOUT|IOC_VOID)) >> 16; 509 if (size > sizeof (data)) { 510 u.u_error = EFAULT; 511 return; 512 } 513 if (com&IOC_IN && size) { 514 if (copyin(uap->cmarg, (caddr_t)data, (u_int)size)) { 515 u.u_error = EFAULT; 516 return; 517 } 518 } else 519 *(caddr_t *)data = uap->cmarg; 520 /* 521 * Zero the buffer on the stack so the user 522 * always gets back something deterministic. 523 */ 524 if ((com&IOC_OUT) && size) 525 bzero((caddr_t)data, size); 526 527 if (fp->f_type == DTYPE_SOCKET) 528 u.u_error = soioctl(fp->f_socket, com, data); 529 else { 530 register struct inode *ip = fp->f_inode; 531 int fmt = ip->i_mode & IFMT; 532 dev_t dev; 533 534 if (fmt != IFCHR) { 535 if (com == FIONREAD && (fmt == IFREG || fmt == IFDIR)) { 536 *(off_t *)data = ip->i_size - fp->f_offset; 537 goto returndata; 538 } 539 if (com != FIONBIO && com != FIOASYNC) 540 u.u_error = ENOTTY; 541 return; 542 } 543 dev = ip->i_rdev; 544 u.u_r.r_val1 = 0; 545 if ((u.u_procp->p_flag&SNUSIG) && setjmp(&u.u_qsave)) { 546 u.u_eosys = RESTARTSYS; 547 return; 548 } 549 u.u_error = (*cdevsw[major(dev)].d_ioctl)(dev, com, data, 0); 550 } 551 552 returndata: 553 /* 554 * Copy any data to user, size was 555 * already set and checked above. 556 */ 557 if (u.u_error == 0 && (com&IOC_OUT)) 558 if (size && copyout(data, uap->cmarg, (u_int)size)) 559 u.u_error = EFAULT; 560 } 561 562 /* 563 * Do nothing specific version of line 564 * discipline specific ioctl command. 565 */ 566 /*ARGSUSED*/ 567 nullioctl(tp, cmd, data, flags) 568 struct tty *tp; 569 char *data; 570 int flags; 571 { 572 573 #ifdef lint 574 tp = tp; data = data; flags = flags; 575 #endif 576 return (-1); 577 } 578 579 ostty() 580 { 581 582 } 583 584 ogtty() 585 { 586 587 } 588