sys_generic.c revision 1.22
1 /* $NetBSD: sys_generic.c,v 1.22 1996/02/04 02:16:53 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)sys_generic.c 8.5 (Berkeley) 1/21/94 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/filedesc.h> 46 #include <sys/ioctl.h> 47 #include <sys/file.h> 48 #include <sys/proc.h> 49 #include <sys/socketvar.h> 50 #include <sys/signalvar.h> 51 #include <sys/uio.h> 52 #include <sys/kernel.h> 53 #include <sys/stat.h> 54 #include <sys/malloc.h> 55 #ifdef KTRACE 56 #include <sys/ktrace.h> 57 #endif 58 59 #include <sys/mount.h> 60 #include <sys/syscallargs.h> 61 62 #include <kern/kern_extern.h> 63 64 int selscan __P((struct proc *, fd_set *, fd_set *, int, register_t *)); 65 int seltrue __P((dev_t, int, struct proc *)); 66 67 /* 68 * Read system call. 69 */ 70 /* ARGSUSED */ 71 int 72 sys_read(p, v, retval) 73 struct proc *p; 74 void *v; 75 register_t *retval; 76 { 77 register struct sys_read_args /* { 78 syscallarg(int) fd; 79 syscallarg(char *) buf; 80 syscallarg(u_int) nbyte; 81 } */ *uap = v; 82 register struct file *fp; 83 register struct filedesc *fdp = p->p_fd; 84 struct uio auio; 85 struct iovec aiov; 86 long cnt, error = 0; 87 #ifdef KTRACE 88 struct iovec ktriov; 89 #endif 90 91 if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles || 92 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 93 (fp->f_flag & FREAD) == 0) 94 return (EBADF); 95 aiov.iov_base = (caddr_t)SCARG(uap, buf); 96 aiov.iov_len = SCARG(uap, nbyte); 97 auio.uio_iov = &aiov; 98 auio.uio_iovcnt = 1; 99 auio.uio_resid = SCARG(uap, nbyte); 100 auio.uio_rw = UIO_READ; 101 auio.uio_segflg = UIO_USERSPACE; 102 auio.uio_procp = p; 103 if (auio.uio_resid < 0) 104 return EINVAL; 105 #ifdef KTRACE 106 /* 107 * if tracing, save a copy of iovec 108 */ 109 if (KTRPOINT(p, KTR_GENIO)) 110 ktriov = aiov; 111 #endif 112 cnt = SCARG(uap, nbyte); 113 error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred); 114 if (error) 115 if (auio.uio_resid != cnt && (error == ERESTART || 116 error == EINTR || error == EWOULDBLOCK)) 117 error = 0; 118 cnt -= auio.uio_resid; 119 #ifdef KTRACE 120 if (KTRPOINT(p, KTR_GENIO) && error == 0) 121 ktrgenio(p->p_tracep, SCARG(uap, fd), UIO_READ, &ktriov, 122 cnt, error); 123 #endif 124 *retval = cnt; 125 return (error); 126 } 127 128 /* 129 * Scatter read system call. 130 */ 131 int 132 sys_readv(p, v, retval) 133 struct proc *p; 134 void *v; 135 register_t *retval; 136 { 137 register struct sys_readv_args /* { 138 syscallarg(int) fd; 139 syscallarg(struct iovec *) iovp; 140 syscallarg(u_int) iovcnt; 141 } */ *uap = v; 142 register struct file *fp; 143 register struct filedesc *fdp = p->p_fd; 144 struct uio auio; 145 register struct iovec *iov; 146 struct iovec *needfree; 147 struct iovec aiov[UIO_SMALLIOV]; 148 long i, cnt, error = 0; 149 u_int iovlen; 150 #ifdef KTRACE 151 struct iovec *ktriov = NULL; 152 #endif 153 154 if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles || 155 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 156 (fp->f_flag & FREAD) == 0) 157 return (EBADF); 158 /* note: can't use iovlen until iovcnt is validated */ 159 iovlen = SCARG(uap, iovcnt) * sizeof (struct iovec); 160 if (SCARG(uap, iovcnt) > UIO_SMALLIOV) { 161 if (SCARG(uap, iovcnt) > UIO_MAXIOV) 162 return (EINVAL); 163 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 164 needfree = iov; 165 } else { 166 iov = aiov; 167 needfree = NULL; 168 } 169 auio.uio_iov = iov; 170 auio.uio_iovcnt = SCARG(uap, iovcnt); 171 auio.uio_rw = UIO_READ; 172 auio.uio_segflg = UIO_USERSPACE; 173 auio.uio_procp = p; 174 error = copyin((caddr_t)SCARG(uap, iovp), (caddr_t)iov, iovlen); 175 if (error) 176 goto done; 177 auio.uio_resid = 0; 178 for (i = 0; i < SCARG(uap, iovcnt); i++) { 179 #if 0 180 /* Cannot happen iov_len is unsigned */ 181 if (iov->iov_len < 0) { 182 error = EINVAL; 183 goto done; 184 } 185 #endif 186 auio.uio_resid += iov->iov_len; 187 if (auio.uio_resid < 0) { 188 error = EINVAL; 189 goto done; 190 } 191 iov++; 192 } 193 #ifdef KTRACE 194 /* 195 * if tracing, save a copy of iovec 196 */ 197 if (KTRPOINT(p, KTR_GENIO)) { 198 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 199 bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen); 200 } 201 #endif 202 cnt = auio.uio_resid; 203 error = (*fp->f_ops->fo_read)(fp, &auio, fp->f_cred); 204 if (error) 205 if (auio.uio_resid != cnt && (error == ERESTART || 206 error == EINTR || error == EWOULDBLOCK)) 207 error = 0; 208 cnt -= auio.uio_resid; 209 #ifdef KTRACE 210 if (ktriov != NULL) { 211 if (error == 0) 212 ktrgenio(p->p_tracep, SCARG(uap, fd), UIO_READ, ktriov, 213 cnt, error); 214 FREE(ktriov, M_TEMP); 215 } 216 #endif 217 *retval = cnt; 218 done: 219 if (needfree) 220 FREE(needfree, M_IOV); 221 return (error); 222 } 223 224 /* 225 * Write system call 226 */ 227 int 228 sys_write(p, v, retval) 229 struct proc *p; 230 void *v; 231 register_t *retval; 232 { 233 register struct sys_write_args /* { 234 syscallarg(int) fd; 235 syscallarg(char *) buf; 236 syscallarg(u_int) nbyte; 237 } */ *uap = v; 238 register struct file *fp; 239 register struct filedesc *fdp = p->p_fd; 240 struct uio auio; 241 struct iovec aiov; 242 long cnt, error = 0; 243 #ifdef KTRACE 244 struct iovec ktriov; 245 #endif 246 247 if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles || 248 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 249 (fp->f_flag & FWRITE) == 0) 250 return (EBADF); 251 aiov.iov_base = (caddr_t)SCARG(uap, buf); 252 aiov.iov_len = SCARG(uap, nbyte); 253 auio.uio_iov = &aiov; 254 auio.uio_iovcnt = 1; 255 auio.uio_resid = SCARG(uap, nbyte); 256 auio.uio_rw = UIO_WRITE; 257 auio.uio_segflg = UIO_USERSPACE; 258 auio.uio_procp = p; 259 if (auio.uio_resid < 0) 260 return EINVAL; 261 #ifdef KTRACE 262 /* 263 * if tracing, save a copy of iovec 264 */ 265 if (KTRPOINT(p, KTR_GENIO)) 266 ktriov = aiov; 267 #endif 268 cnt = SCARG(uap, nbyte); 269 error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred); 270 if (error) { 271 if (auio.uio_resid != cnt && (error == ERESTART || 272 error == EINTR || error == EWOULDBLOCK)) 273 error = 0; 274 if (error == EPIPE) 275 psignal(p, SIGPIPE); 276 } 277 cnt -= auio.uio_resid; 278 #ifdef KTRACE 279 if (KTRPOINT(p, KTR_GENIO) && error == 0) 280 ktrgenio(p->p_tracep, SCARG(uap, fd), UIO_WRITE, 281 &ktriov, cnt, error); 282 #endif 283 *retval = cnt; 284 return (error); 285 } 286 287 /* 288 * Gather write system call 289 */ 290 int 291 sys_writev(p, v, retval) 292 struct proc *p; 293 void *v; 294 register_t *retval; 295 { 296 register struct sys_writev_args /* { 297 syscallarg(int) fd; 298 syscallarg(struct iovec *) iovp; 299 syscallarg(u_int) iovcnt; 300 } */ *uap = v; 301 register struct file *fp; 302 register struct filedesc *fdp = p->p_fd; 303 struct uio auio; 304 register struct iovec *iov; 305 struct iovec *needfree; 306 struct iovec aiov[UIO_SMALLIOV]; 307 long i, cnt, error = 0; 308 u_int iovlen; 309 #ifdef KTRACE 310 struct iovec *ktriov = NULL; 311 #endif 312 313 if (((u_int)SCARG(uap, fd)) >= fdp->fd_nfiles || 314 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL || 315 (fp->f_flag & FWRITE) == 0) 316 return (EBADF); 317 /* note: can't use iovlen until iovcnt is validated */ 318 iovlen = SCARG(uap, iovcnt) * sizeof (struct iovec); 319 if (SCARG(uap, iovcnt) > UIO_SMALLIOV) { 320 if (SCARG(uap, iovcnt) > UIO_MAXIOV) 321 return (EINVAL); 322 MALLOC(iov, struct iovec *, iovlen, M_IOV, M_WAITOK); 323 needfree = iov; 324 } else { 325 iov = aiov; 326 needfree = NULL; 327 } 328 auio.uio_iov = iov; 329 auio.uio_iovcnt = SCARG(uap, iovcnt); 330 auio.uio_rw = UIO_WRITE; 331 auio.uio_segflg = UIO_USERSPACE; 332 auio.uio_procp = p; 333 error = copyin((caddr_t)SCARG(uap, iovp), (caddr_t)iov, iovlen); 334 if (error) 335 goto done; 336 auio.uio_resid = 0; 337 for (i = 0; i < SCARG(uap, iovcnt); i++) { 338 #if 0 339 /* Cannot happen iov_len is unsigned */ 340 if (iov->iov_len < 0) { 341 error = EINVAL; 342 goto done; 343 } 344 #endif 345 auio.uio_resid += iov->iov_len; 346 if (auio.uio_resid < 0) { 347 error = EINVAL; 348 goto done; 349 } 350 iov++; 351 } 352 #ifdef KTRACE 353 /* 354 * if tracing, save a copy of iovec 355 */ 356 if (KTRPOINT(p, KTR_GENIO)) { 357 MALLOC(ktriov, struct iovec *, iovlen, M_TEMP, M_WAITOK); 358 bcopy((caddr_t)auio.uio_iov, (caddr_t)ktriov, iovlen); 359 } 360 #endif 361 cnt = auio.uio_resid; 362 error = (*fp->f_ops->fo_write)(fp, &auio, fp->f_cred); 363 if (error) { 364 if (auio.uio_resid != cnt && (error == ERESTART || 365 error == EINTR || error == EWOULDBLOCK)) 366 error = 0; 367 if (error == EPIPE) 368 psignal(p, SIGPIPE); 369 } 370 cnt -= auio.uio_resid; 371 #ifdef KTRACE 372 if (ktriov != NULL) { 373 if (error == 0) 374 ktrgenio(p->p_tracep, SCARG(uap, fd), UIO_WRITE, 375 ktriov, cnt, error); 376 FREE(ktriov, M_TEMP); 377 } 378 #endif 379 *retval = cnt; 380 done: 381 if (needfree) 382 FREE(needfree, M_IOV); 383 return (error); 384 } 385 386 /* 387 * Ioctl system call 388 */ 389 /* ARGSUSED */ 390 int 391 sys_ioctl(p, v, retval) 392 struct proc *p; 393 void *v; 394 register_t *retval; 395 { 396 register struct sys_ioctl_args /* { 397 syscallarg(int) fd; 398 syscallarg(u_long) com; 399 syscallarg(caddr_t) data; 400 } */ *uap = v; 401 register struct file *fp; 402 register struct filedesc *fdp; 403 register u_long com; 404 register int error; 405 register u_int size; 406 caddr_t data, memp; 407 int tmp; 408 #define STK_PARAMS 128 409 char stkbuf[STK_PARAMS]; 410 411 fdp = p->p_fd; 412 if ((u_int)SCARG(uap, fd) >= fdp->fd_nfiles || 413 (fp = fdp->fd_ofiles[SCARG(uap, fd)]) == NULL) 414 return (EBADF); 415 416 if ((fp->f_flag & (FREAD | FWRITE)) == 0) 417 return (EBADF); 418 419 switch (com = SCARG(uap, com)) { 420 case FIONCLEX: 421 fdp->fd_ofileflags[SCARG(uap, fd)] &= ~UF_EXCLOSE; 422 return (0); 423 case FIOCLEX: 424 fdp->fd_ofileflags[SCARG(uap, fd)] |= UF_EXCLOSE; 425 return (0); 426 } 427 428 /* 429 * Interpret high order word to find amount of data to be 430 * copied to/from the user's address space. 431 */ 432 size = IOCPARM_LEN(com); 433 if (size > IOCPARM_MAX) 434 return (ENOTTY); 435 memp = NULL; 436 if (size > sizeof (stkbuf)) { 437 memp = (caddr_t)malloc((u_long)size, M_IOCTLOPS, M_WAITOK); 438 data = memp; 439 } else 440 data = stkbuf; 441 if (com&IOC_IN) { 442 if (size) { 443 error = copyin(SCARG(uap, data), data, (u_int)size); 444 if (error) { 445 if (memp) 446 free(memp, M_IOCTLOPS); 447 return (error); 448 } 449 } else 450 *(caddr_t *)data = SCARG(uap, data); 451 } else if ((com&IOC_OUT) && size) 452 /* 453 * Zero the buffer so the user always 454 * gets back something deterministic. 455 */ 456 bzero(data, size); 457 else if (com&IOC_VOID) 458 *(caddr_t *)data = SCARG(uap, data); 459 460 switch (com) { 461 462 case FIONBIO: 463 if ((tmp = *(int *)data) != 0) 464 fp->f_flag |= FNONBLOCK; 465 else 466 fp->f_flag &= ~FNONBLOCK; 467 error = (*fp->f_ops->fo_ioctl)(fp, FIONBIO, (caddr_t)&tmp, p); 468 break; 469 470 case FIOASYNC: 471 if ((tmp = *(int *)data) != 0) 472 fp->f_flag |= FASYNC; 473 else 474 fp->f_flag &= ~FASYNC; 475 error = (*fp->f_ops->fo_ioctl)(fp, FIOASYNC, (caddr_t)&tmp, p); 476 break; 477 478 case FIOSETOWN: 479 tmp = *(int *)data; 480 if (fp->f_type == DTYPE_SOCKET) { 481 ((struct socket *)fp->f_data)->so_pgid = tmp; 482 error = 0; 483 break; 484 } 485 if (tmp <= 0) { 486 tmp = -tmp; 487 } else { 488 struct proc *p1 = pfind(tmp); 489 if (p1 == 0) { 490 error = ESRCH; 491 break; 492 } 493 tmp = p1->p_pgrp->pg_id; 494 } 495 error = (*fp->f_ops->fo_ioctl) 496 (fp, (int)TIOCSPGRP, (caddr_t)&tmp, p); 497 break; 498 499 case FIOGETOWN: 500 if (fp->f_type == DTYPE_SOCKET) { 501 error = 0; 502 *(int *)data = ((struct socket *)fp->f_data)->so_pgid; 503 break; 504 } 505 error = (*fp->f_ops->fo_ioctl)(fp, TIOCGPGRP, data, p); 506 *(int *)data = -*(int *)data; 507 break; 508 509 default: 510 error = (*fp->f_ops->fo_ioctl)(fp, com, data, p); 511 /* 512 * Copy any data to user, size was 513 * already set and checked above. 514 */ 515 if (error == 0 && (com&IOC_OUT) && size) 516 error = copyout(data, SCARG(uap, data), (u_int)size); 517 break; 518 } 519 if (memp) 520 free(memp, M_IOCTLOPS); 521 return (error); 522 } 523 524 int selwait, nselcoll; 525 526 /* 527 * Select system call. 528 */ 529 int 530 sys_select(p, v, retval) 531 register struct proc *p; 532 void *v; 533 register_t *retval; 534 { 535 register struct sys_select_args /* { 536 syscallarg(u_int) nd; 537 syscallarg(fd_set *) in; 538 syscallarg(fd_set *) ou; 539 syscallarg(fd_set *) ex; 540 syscallarg(struct timeval *) tv; 541 } */ *uap = v; 542 fd_set ibits[3], obits[3]; 543 struct timeval atv; 544 int s, ncoll, error = 0, timo; 545 u_int ni; 546 547 bzero((caddr_t)ibits, sizeof(ibits)); 548 bzero((caddr_t)obits, sizeof(obits)); 549 if (SCARG(uap, nd) > FD_SETSIZE) 550 return (EINVAL); 551 if (SCARG(uap, nd) > p->p_fd->fd_nfiles) { 552 /* forgiving; slightly wrong */ 553 SCARG(uap, nd) = p->p_fd->fd_nfiles; 554 } 555 ni = howmany(SCARG(uap, nd), NFDBITS) * sizeof(fd_mask); 556 557 #define getbits(name, x) \ 558 if (SCARG(uap, name) && (error = copyin((caddr_t)SCARG(uap, name), \ 559 (caddr_t)&ibits[x], ni))) \ 560 goto done; 561 getbits(in, 0); 562 getbits(ou, 1); 563 getbits(ex, 2); 564 #undef getbits 565 566 if (SCARG(uap, tv)) { 567 error = copyin((caddr_t)SCARG(uap, tv), (caddr_t)&atv, 568 sizeof (atv)); 569 if (error) 570 goto done; 571 if (itimerfix(&atv)) { 572 error = EINVAL; 573 goto done; 574 } 575 s = splclock(); 576 timeradd(&atv, &time, &atv); 577 timo = hzto(&atv); 578 /* 579 * Avoid inadvertently sleeping forever. 580 */ 581 if (timo == 0) 582 timo = 1; 583 splx(s); 584 } else 585 timo = 0; 586 retry: 587 ncoll = nselcoll; 588 p->p_flag |= P_SELECT; 589 error = selscan(p, ibits, obits, SCARG(uap, nd), retval); 590 if (error || *retval) 591 goto done; 592 s = splhigh(); 593 /* this should be timercmp(&time, &atv, >=) */ 594 if (SCARG(uap, tv) && (time.tv_sec > atv.tv_sec || 595 (time.tv_sec == atv.tv_sec && time.tv_usec >= atv.tv_usec))) { 596 splx(s); 597 goto done; 598 } 599 if ((p->p_flag & P_SELECT) == 0 || nselcoll != ncoll) { 600 splx(s); 601 goto retry; 602 } 603 p->p_flag &= ~P_SELECT; 604 error = tsleep((caddr_t)&selwait, PSOCK | PCATCH, "select", timo); 605 splx(s); 606 if (error == 0) 607 goto retry; 608 done: 609 p->p_flag &= ~P_SELECT; 610 /* select is not restarted after signals... */ 611 if (error == ERESTART) 612 error = EINTR; 613 if (error == EWOULDBLOCK) 614 error = 0; 615 #define putbits(name, x) \ 616 if (SCARG(uap, name) && (error2 = copyout((caddr_t)&obits[x], \ 617 (caddr_t)SCARG(uap, name), ni))) \ 618 error = error2; 619 if (error == 0) { 620 int error2; 621 622 putbits(in, 0); 623 putbits(ou, 1); 624 putbits(ex, 2); 625 #undef putbits 626 } 627 return (error); 628 } 629 630 int 631 selscan(p, ibits, obits, nfd, retval) 632 struct proc *p; 633 fd_set *ibits, *obits; 634 int nfd; 635 register_t *retval; 636 { 637 register struct filedesc *fdp = p->p_fd; 638 register int msk, i, j, fd; 639 register fd_mask bits; 640 struct file *fp; 641 int n = 0; 642 static int flag[3] = { FREAD, FWRITE, 0 }; 643 644 for (msk = 0; msk < 3; msk++) { 645 for (i = 0; i < nfd; i += NFDBITS) { 646 bits = ibits[msk].fds_bits[i/NFDBITS]; 647 while ((j = ffs(bits)) && (fd = i + --j) < nfd) { 648 bits &= ~(1 << j); 649 fp = fdp->fd_ofiles[fd]; 650 if (fp == NULL) 651 return (EBADF); 652 if ((*fp->f_ops->fo_select)(fp, flag[msk], p)) { 653 FD_SET(fd, &obits[msk]); 654 n++; 655 } 656 } 657 } 658 } 659 *retval = n; 660 return (0); 661 } 662 663 /*ARGSUSED*/ 664 int 665 seltrue(dev, flag, p) 666 dev_t dev; 667 int flag; 668 struct proc *p; 669 { 670 671 return (1); 672 } 673 674 /* 675 * Record a select request. 676 */ 677 void 678 selrecord(selector, sip) 679 struct proc *selector; 680 struct selinfo *sip; 681 { 682 struct proc *p; 683 pid_t mypid; 684 685 mypid = selector->p_pid; 686 if (sip->si_pid == mypid) 687 return; 688 if (sip->si_pid && (p = pfind(sip->si_pid)) && 689 p->p_wchan == (caddr_t)&selwait) 690 sip->si_flags |= SI_COLL; 691 else 692 sip->si_pid = mypid; 693 } 694 695 /* 696 * Do a wakeup when a selectable event occurs. 697 */ 698 void 699 selwakeup(sip) 700 register struct selinfo *sip; 701 { 702 register struct proc *p; 703 int s; 704 705 if (sip->si_pid == 0) 706 return; 707 if (sip->si_flags & SI_COLL) { 708 nselcoll++; 709 sip->si_flags &= ~SI_COLL; 710 wakeup((caddr_t)&selwait); 711 } 712 p = pfind(sip->si_pid); 713 sip->si_pid = 0; 714 if (p != NULL) { 715 s = splhigh(); 716 if (p->p_wchan == (caddr_t)&selwait) { 717 if (p->p_stat == SSLEEP) 718 setrunnable(p); 719 else 720 unsleep(p); 721 } else if (p->p_flag & P_SELECT) 722 p->p_flag &= ~P_SELECT; 723 splx(s); 724 } 725 } 726
Indexes created Mon Sep 22 10:09:38 GMT 2025