1 /* sys_generic.c 6.6 84/12/27 */ 2 3 #include "param.h" 4 #include "systm.h" 5 #include "dir.h" 6 #include "user.h" 7 #include "ioctl.h" 8 #include "file.h" 9 #include "proc.h" 10 #include "uio.h" 11 #include "kernel.h" 12 #include "stat.h" 13 14 /* 15 * Read system call. 16 */ 17 read() 18 { 19 register struct a { 20 int fdes; 21 char *cbuf; 22 unsigned count; 23 } *uap = (struct a *)u.u_ap; 24 struct uio auio; 25 struct iovec aiov; 26 27 aiov.iov_base = (caddr_t)uap->cbuf; 28 aiov.iov_len = uap->count; 29 auio.uio_iov = &aiov; 30 auio.uio_iovcnt = 1; 31 rwuio(&auio, UIO_READ); 32 } 33 34 readv() 35 { 36 register struct a { 37 int fdes; 38 struct iovec *iovp; 39 int iovcnt; 40 } *uap = (struct a *)u.u_ap; 41 struct uio auio; 42 struct iovec aiov[16]; /* XXX */ 43 44 if (uap->iovcnt <= 0 || uap->iovcnt > sizeof(aiov)/sizeof(aiov[0])) { 45 u.u_error = EINVAL; 46 return; 47 } 48 auio.uio_iov = aiov; 49 auio.uio_iovcnt = uap->iovcnt; 50 u.u_error = copyin((caddr_t)uap->iovp, (caddr_t)aiov, 51 (unsigned)(uap->iovcnt * sizeof (struct iovec))); 52 if (u.u_error) 53 return; 54 rwuio(&auio, UIO_READ); 55 } 56 57 /* 58 * Write system call 59 */ 60 write() 61 { 62 register struct a { 63 int fdes; 64 char *cbuf; 65 int count; 66 } *uap = (struct a *)u.u_ap; 67 struct uio auio; 68 struct iovec aiov; 69 70 auio.uio_iov = &aiov; 71 auio.uio_iovcnt = 1; 72 aiov.iov_base = uap->cbuf; 73 aiov.iov_len = uap->count; 74 rwuio(&auio, UIO_WRITE); 75 } 76 77 writev() 78 { 79 register struct a { 80 int fdes; 81 struct iovec *iovp; 82 int iovcnt; 83 } *uap = (struct a *)u.u_ap; 84 struct uio auio; 85 struct iovec aiov[16]; /* XXX */ 86 87 if (uap->iovcnt <= 0 || uap->iovcnt > sizeof(aiov)/sizeof(aiov[0])) { 88 u.u_error = EINVAL; 89 return; 90 } 91 auio.uio_iov = aiov; 92 auio.uio_iovcnt = uap->iovcnt; 93 u.u_error = copyin((caddr_t)uap->iovp, (caddr_t)aiov, 94 (unsigned)(uap->iovcnt * sizeof (struct iovec))); 95 if (u.u_error) 96 return; 97 rwuio(&auio, UIO_WRITE); 98 } 99 100 rwuio(uio, rw) 101 register struct uio *uio; 102 enum uio_rw rw; 103 { 104 struct a { 105 int fdes; 106 }; 107 register struct file *fp; 108 register struct iovec *iov; 109 int i, count; 110 111 GETF(fp, ((struct a *)u.u_ap)->fdes); 112 if ((fp->f_flag&(rw==UIO_READ ? FREAD : FWRITE)) == 0) { 113 u.u_error = EBADF; 114 return; 115 } 116 uio->uio_resid = 0; 117 uio->uio_segflg = UIO_USERSPACE; 118 iov = uio->uio_iov; 119 for (i = 0; i < uio->uio_iovcnt; i++) { 120 if (iov->iov_len < 0) { 121 u.u_error = EINVAL; 122 return; 123 } 124 uio->uio_resid += iov->iov_len; 125 if (uio->uio_resid < 0) { 126 u.u_error = EINVAL; 127 return; 128 } 129 iov++; 130 } 131 count = uio->uio_resid; 132 uio->uio_offset = fp->f_offset; 133 if ((u.u_procp->p_flag&SOUSIG) == 0 && setjmp(&u.u_qsave)) { 134 if (uio->uio_resid == count) 135 u.u_eosys = RESTARTSYS; 136 } else 137 u.u_error = (*fp->f_ops->fo_rw)(fp, rw, uio); 138 u.u_r.r_val1 = count - uio->uio_resid; 139 fp->f_offset += u.u_r.r_val1; 140 } 141 142 /* 143 * Ioctl system call 144 */ 145 ioctl() 146 { 147 register struct file *fp; 148 struct a { 149 int fdes; 150 int cmd; 151 caddr_t cmarg; 152 } *uap; 153 register int com; 154 register u_int size; 155 char data[IOCPARM_MASK+1]; 156 157 uap = (struct a *)u.u_ap; 158 GETF(fp, uap->fdes); 159 if ((fp->f_flag & (FREAD|FWRITE)) == 0) { 160 u.u_error = EBADF; 161 return; 162 } 163 com = uap->cmd; 164 165 #if defined(vax) && defined(COMPAT) 166 /* 167 * Map old style ioctl's into new for the 168 * sake of backwards compatibility (sigh). 169 */ 170 if ((com&~0xffff) == 0) { 171 com = mapioctl(com); 172 if (com == 0) { 173 u.u_error = EINVAL; 174 return; 175 } 176 } 177 #endif 178 if (com == FIOCLEX) { 179 u.u_pofile[uap->fdes] |= UF_EXCLOSE; 180 return; 181 } 182 if (com == FIONCLEX) { 183 u.u_pofile[uap->fdes] &= ~UF_EXCLOSE; 184 return; 185 } 186 187 /* 188 * Interpret high order word to find 189 * amount of data to be copied to/from the 190 * user's address space. 191 */ 192 size = (com &~ (IOC_INOUT|IOC_VOID)) >> 16; 193 if (size > sizeof (data)) { 194 u.u_error = EFAULT; 195 return; 196 } 197 if (com&IOC_IN) { 198 if (size) { 199 u.u_error = 200 copyin(uap->cmarg, (caddr_t)data, (u_int)size); 201 if (u.u_error) 202 return; 203 } else 204 *(caddr_t *)data = uap->cmarg; 205 } else if ((com&IOC_OUT) && size) 206 /* 207 * Zero the buffer on the stack so the user 208 * always gets back something deterministic. 209 */ 210 bzero((caddr_t)data, size); 211 else if (com&IOC_VOID) 212 *(caddr_t *)data = uap->cmarg; 213 214 switch (com) { 215 216 case FIONBIO: 217 u.u_error = fset(fp, FNDELAY, *(int *)data); 218 return; 219 220 case FIOASYNC: 221 u.u_error = fset(fp, FASYNC, *(int *)data); 222 return; 223 224 case FIOSETOWN: 225 u.u_error = fsetown(fp, *(int *)data); 226 return; 227 228 case FIOGETOWN: 229 u.u_error = fgetown(fp, (int *)data); 230 return; 231 } 232 u.u_error = (*fp->f_ops->fo_ioctl)(fp, com, data); 233 /* 234 * Copy any data to user, size was 235 * already set and checked above. 236 */ 237 if (u.u_error == 0 && (com&IOC_OUT) && size) 238 u.u_error = copyout(data, uap->cmarg, (u_int)size); 239 } 240 241 int unselect(); 242 int nselcoll; 243 244 /* 245 * Select uses bit masks of file descriptors in ints. 246 * These macros manipulate such bit fields (the filesystem macros use chars). 247 */ 248 #define NBI (sizeof(int) * NBBY) /* bits per int */ 249 #define NI howmany(NOFILE, NBI) 250 #define tbit(p, n) ((p)[(n)/NBI] & (1 << ((n) % NBI))) 251 #define sbit(p, n) ((p)[(n)/NBI] |= (1 << ((n) % NBI))) 252 #define cbit(p, n) ((p)[(n)/NBI] &= ~(1 << ((n) % NBI))) 253 254 /* 255 * Select system call. 256 */ 257 select() 258 { 259 register struct uap { 260 int nd; 261 int *in, *ou, *ex; 262 struct timeval *tv; 263 } *uap = (struct uap *)u.u_ap; 264 int ibits[3][NI], obits[3][NI]; 265 struct timeval atv; 266 int s, ncoll, ni; 267 label_t lqsave; 268 269 bzero(ibits, sizeof(ibits)); 270 bzero(obits, sizeof(obits)); 271 if (uap->nd > NOFILE) 272 uap->nd = NOFILE; /* forgiving, if slightly wrong */ 273 ni = howmany(uap->nd, NBI); 274 275 #define getbits(name, x) \ 276 if (uap->name) { \ 277 u.u_error = copyin((caddr_t)uap->name, (caddr_t)ibits[x], \ 278 ni * sizeof(int)); \ 279 if (u.u_error) \ 280 goto done; \ 281 } 282 getbits(in, 0); 283 getbits(ou, 1); 284 getbits(ex, 2); 285 #undef getbits 286 287 if (uap->tv) { 288 u.u_error = copyin((caddr_t)uap->tv, (caddr_t)&atv, 289 sizeof (atv)); 290 if (u.u_error) 291 goto done; 292 if (itimerfix(&atv)) { 293 u.u_error = EINVAL; 294 goto done; 295 } 296 s = spl7(); timevaladd(&atv, &time); splx(s); 297 } 298 retry: 299 ncoll = nselcoll; 300 u.u_procp->p_flag |= SSEL; 301 u.u_r.r_val1 = selscan(ibits, obits, uap->nd); 302 if (u.u_error || u.u_r.r_val1) 303 goto done; 304 s = spl6(); 305 /* this should be timercmp(&time, &atv, >=) */ 306 if (uap->tv && (time.tv_sec > atv.tv_sec || 307 time.tv_sec == atv.tv_sec && time.tv_usec >= atv.tv_usec)) { 308 splx(s); 309 goto done; 310 } 311 if ((u.u_procp->p_flag & SSEL) == 0 || nselcoll != ncoll) { 312 u.u_procp->p_flag &= ~SSEL; 313 splx(s); 314 goto retry; 315 } 316 u.u_procp->p_flag &= ~SSEL; 317 if (uap->tv) { 318 lqsave = u.u_qsave; 319 if (setjmp(&u.u_qsave)) { 320 untimeout(unselect, (caddr_t)u.u_procp); 321 u.u_error = EINTR; 322 splx(s); 323 goto done; 324 } 325 timeout(unselect, (caddr_t)u.u_procp, hzto(&atv)); 326 } 327 sleep((caddr_t)&selwait, PZERO+1); 328 if (uap->tv) { 329 u.u_qsave = lqsave; 330 untimeout(unselect, (caddr_t)u.u_procp); 331 } 332 splx(s); 333 goto retry; 334 done: 335 #define putbits(name, x) \ 336 if (uap->name) { \ 337 int error = copyout((caddr_t)obits[x], (caddr_t)uap->name, \ 338 ni * sizeof(int)); \ 339 if (error) \ 340 u.u_error = error; \ 341 } 342 putbits(in, 0); 343 putbits(ou, 1); 344 putbits(ex, 2); 345 #undef putbits 346 } 347 348 unselect(p) 349 register struct proc *p; 350 { 351 register int s = spl6(); 352 353 switch (p->p_stat) { 354 355 case SSLEEP: 356 setrun(p); 357 break; 358 359 case SSTOP: 360 unsleep(p); 361 break; 362 } 363 splx(s); 364 } 365 366 selscan(ibits, obits, nfd) 367 int (*ibits)[NI], (*obits)[NI]; 368 { 369 register int which, bits, i, j; 370 int flag; 371 struct file *fp; 372 int n = 0; 373 374 for (which = 0; which < 3; which++) { 375 switch (which) { 376 377 case 0: 378 flag = FREAD; break; 379 380 case 1: 381 flag = FWRITE; break; 382 383 case 2: 384 flag = 0; break; 385 } 386 for (i = 0; i < nfd; i += NBI) { 387 bits = ibits[which][i/NBI]; 388 while ((j = ffs(bits)) && i + --j < nfd) { 389 bits &= ~(1 << j); 390 fp = u.u_ofile[i + j]; 391 if (fp == NULL) { 392 u.u_error = EBADF; 393 break; 394 } 395 if ((*fp->f_ops->fo_select)(fp, flag)) { 396 sbit(obits[which], i + j); 397 n++; 398 } 399 } 400 } 401 } 402 return (n); 403 } 404 405 /*ARGSUSED*/ 406 seltrue(dev, flag) 407 dev_t dev; 408 int flag; 409 { 410 411 return (1); 412 } 413 414 selwakeup(p, coll) 415 register struct proc *p; 416 int coll; 417 { 418 419 if (coll) { 420 nselcoll++; 421 wakeup((caddr_t)&selwait); 422 } 423 if (p) { 424 int s = spl6(); 425 if (p->p_wchan == (caddr_t)&selwait) { 426 if (p->p_stat == SSLEEP) 427 setrun(p); 428 else 429 unsleep(p); 430 } else if (p->p_flag & SSEL) 431 p->p_flag &= ~SSEL; 432 splx(s); 433 } 434 } 435