1 /* sys_generic.c 6.10 85/05/27 */ 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 (setjmp(&u.u_qsave)) { 134 if (uio->uio_resid == count) { 135 if ((u.u_sigintr & sigmask(u.u_procp->p_cursig)) != 0) 136 u.u_error = EINTR; 137 else 138 u.u_eosys = RESTARTSYS; 139 } 140 } else 141 u.u_error = (*fp->f_ops->fo_rw)(fp, rw, uio); 142 u.u_r.r_val1 = count - uio->uio_resid; 143 fp->f_offset += u.u_r.r_val1; 144 } 145 146 /* 147 * Ioctl system call 148 */ 149 ioctl() 150 { 151 register struct file *fp; 152 struct a { 153 int fdes; 154 int cmd; 155 caddr_t cmarg; 156 } *uap; 157 register int com; 158 register u_int size; 159 char data[IOCPARM_MASK+1]; 160 161 uap = (struct a *)u.u_ap; 162 GETF(fp, uap->fdes); 163 if ((fp->f_flag & (FREAD|FWRITE)) == 0) { 164 u.u_error = EBADF; 165 return; 166 } 167 com = uap->cmd; 168 169 #if defined(vax) && defined(COMPAT) 170 /* 171 * Map old style ioctl's into new for the 172 * sake of backwards compatibility (sigh). 173 */ 174 if ((com&~0xffff) == 0) { 175 com = mapioctl(com); 176 if (com == 0) { 177 u.u_error = EINVAL; 178 return; 179 } 180 } 181 #endif 182 if (com == FIOCLEX) { 183 u.u_pofile[uap->fdes] |= UF_EXCLOSE; 184 return; 185 } 186 if (com == FIONCLEX) { 187 u.u_pofile[uap->fdes] &= ~UF_EXCLOSE; 188 return; 189 } 190 191 /* 192 * Interpret high order word to find 193 * amount of data to be copied to/from the 194 * user's address space. 195 */ 196 size = (com &~ (IOC_INOUT|IOC_VOID)) >> 16; 197 if (size > sizeof (data)) { 198 u.u_error = EFAULT; 199 return; 200 } 201 if (com&IOC_IN) { 202 if (size) { 203 u.u_error = 204 copyin(uap->cmarg, (caddr_t)data, (u_int)size); 205 if (u.u_error) 206 return; 207 } else 208 *(caddr_t *)data = uap->cmarg; 209 } else if ((com&IOC_OUT) && size) 210 /* 211 * Zero the buffer on the stack so the user 212 * always gets back something deterministic. 213 */ 214 bzero((caddr_t)data, size); 215 else if (com&IOC_VOID) 216 *(caddr_t *)data = uap->cmarg; 217 218 switch (com) { 219 220 case FIONBIO: 221 u.u_error = fset(fp, FNDELAY, *(int *)data); 222 return; 223 224 case FIOASYNC: 225 u.u_error = fset(fp, FASYNC, *(int *)data); 226 return; 227 228 case FIOSETOWN: 229 u.u_error = fsetown(fp, *(int *)data); 230 return; 231 232 case FIOGETOWN: 233 u.u_error = fgetown(fp, (int *)data); 234 return; 235 } 236 u.u_error = (*fp->f_ops->fo_ioctl)(fp, com, data); 237 /* 238 * Copy any data to user, size was 239 * already set and checked above. 240 */ 241 if (u.u_error == 0 && (com&IOC_OUT) && size) 242 u.u_error = copyout(data, uap->cmarg, (u_int)size); 243 } 244 245 int unselect(); 246 int nselcoll; 247 248 /* 249 * Select uses bit masks of file descriptors in ints. 250 * These macros manipulate such bit fields (the filesystem macros use chars). 251 */ 252 #define NBI (sizeof(int) * NBBY) /* bits per int */ 253 #define NI howmany(NOFILE, NBI) 254 #define tbit(p, n) ((p)[(n)/NBI] & (1 << ((n) % NBI))) 255 #define sbit(p, n) ((p)[(n)/NBI] |= (1 << ((n) % NBI))) 256 #define cbit(p, n) ((p)[(n)/NBI] &= ~(1 << ((n) % NBI))) 257 258 /* 259 * Select system call. 260 */ 261 select() 262 { 263 register struct uap { 264 int nd; 265 int *in, *ou, *ex; 266 struct timeval *tv; 267 } *uap = (struct uap *)u.u_ap; 268 int ibits[3][NI], obits[3][NI]; 269 struct timeval atv; 270 int s, ncoll, ni; 271 label_t lqsave; 272 273 bzero(ibits, sizeof(ibits)); 274 bzero(obits, sizeof(obits)); 275 if (uap->nd > NOFILE) 276 uap->nd = NOFILE; /* forgiving, if slightly wrong */ 277 ni = howmany(uap->nd, NBI); 278 279 #define getbits(name, x) \ 280 if (uap->name) { \ 281 u.u_error = copyin((caddr_t)uap->name, (caddr_t)ibits[x], \ 282 ni * sizeof(int)); \ 283 if (u.u_error) \ 284 goto done; \ 285 } 286 getbits(in, 0); 287 getbits(ou, 1); 288 getbits(ex, 2); 289 #undef getbits 290 291 if (uap->tv) { 292 u.u_error = copyin((caddr_t)uap->tv, (caddr_t)&atv, 293 sizeof (atv)); 294 if (u.u_error) 295 goto done; 296 if (itimerfix(&atv)) { 297 u.u_error = EINVAL; 298 goto done; 299 } 300 s = splhigh(); timevaladd(&atv, &time); splx(s); 301 } 302 retry: 303 ncoll = nselcoll; 304 u.u_procp->p_flag |= SSEL; 305 u.u_r.r_val1 = selscan(ibits, obits, uap->nd); 306 if (u.u_error || u.u_r.r_val1) 307 goto done; 308 s = splhigh(); 309 /* this should be timercmp(&time, &atv, >=) */ 310 if (uap->tv && (time.tv_sec > atv.tv_sec || 311 time.tv_sec == atv.tv_sec && time.tv_usec >= atv.tv_usec)) { 312 splx(s); 313 goto done; 314 } 315 if ((u.u_procp->p_flag & SSEL) == 0 || nselcoll != ncoll) { 316 u.u_procp->p_flag &= ~SSEL; 317 splx(s); 318 goto retry; 319 } 320 u.u_procp->p_flag &= ~SSEL; 321 if (uap->tv) { 322 lqsave = u.u_qsave; 323 if (setjmp(&u.u_qsave)) { 324 untimeout(unselect, (caddr_t)u.u_procp); 325 u.u_error = EINTR; 326 splx(s); 327 goto done; 328 } 329 timeout(unselect, (caddr_t)u.u_procp, hzto(&atv)); 330 } 331 sleep((caddr_t)&selwait, PZERO+1); 332 if (uap->tv) { 333 u.u_qsave = lqsave; 334 untimeout(unselect, (caddr_t)u.u_procp); 335 } 336 splx(s); 337 goto retry; 338 done: 339 #define putbits(name, x) \ 340 if (uap->name) { \ 341 int error = copyout((caddr_t)obits[x], (caddr_t)uap->name, \ 342 ni * sizeof(int)); \ 343 if (error) \ 344 u.u_error = error; \ 345 } 346 if (u.u_error != EINTR) { 347 putbits(in, 0); 348 putbits(ou, 1); 349 putbits(ex, 2); 350 #undef putbits 351 } 352 } 353 354 unselect(p) 355 register struct proc *p; 356 { 357 register int s = splhigh(); 358 359 switch (p->p_stat) { 360 361 case SSLEEP: 362 setrun(p); 363 break; 364 365 case SSTOP: 366 unsleep(p); 367 break; 368 } 369 splx(s); 370 } 371 372 selscan(ibits, obits, nfd) 373 int (*ibits)[NI], (*obits)[NI]; 374 { 375 register int which, bits, i, j; 376 int flag; 377 struct file *fp; 378 int n = 0; 379 380 for (which = 0; which < 3; which++) { 381 switch (which) { 382 383 case 0: 384 flag = FREAD; break; 385 386 case 1: 387 flag = FWRITE; break; 388 389 case 2: 390 flag = 0; break; 391 } 392 for (i = 0; i < nfd; i += NBI) { 393 bits = ibits[which][i/NBI]; 394 while ((j = ffs(bits)) && i + --j < nfd) { 395 bits &= ~(1 << j); 396 fp = u.u_ofile[i + j]; 397 if (fp == NULL) { 398 u.u_error = EBADF; 399 break; 400 } 401 if ((*fp->f_ops->fo_select)(fp, flag)) { 402 sbit(obits[which], i + j); 403 n++; 404 } 405 } 406 } 407 } 408 return (n); 409 } 410 411 /*ARGSUSED*/ 412 seltrue(dev, flag) 413 dev_t dev; 414 int flag; 415 { 416 417 return (1); 418 } 419 420 selwakeup(p, coll) 421 register struct proc *p; 422 int coll; 423 { 424 425 if (coll) { 426 nselcoll++; 427 wakeup((caddr_t)&selwait); 428 } 429 if (p) { 430 int s = splhigh(); 431 if (p->p_wchan == (caddr_t)&selwait) { 432 if (p->p_stat == SSLEEP) 433 setrun(p); 434 else 435 unsleep(p); 436 } else if (p->p_flag & SSEL) 437 p->p_flag &= ~SSEL; 438 splx(s); 439 } 440 } 441