diff options
Diffstat (limited to 'contrib/bind9/lib/bind/isc/ev_files.c')
| -rw-r--r-- | contrib/bind9/lib/bind/isc/ev_files.c | 277 |
1 files changed, 0 insertions, 277 deletions
diff --git a/contrib/bind9/lib/bind/isc/ev_files.c b/contrib/bind9/lib/bind/isc/ev_files.c deleted file mode 100644 index 71de091..0000000 --- a/contrib/bind9/lib/bind/isc/ev_files.c +++ /dev/null @@ -1,277 +0,0 @@ -/* - * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") - * Copyright (c) 1995-1999 by Internet Software Consortium - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT - * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ - -/* ev_files.c - implement asynch file IO for the eventlib - * vix 11sep95 [initial] - */ - -#if !defined(LINT) && !defined(CODECENTER) -static const char rcsid[] = "$Id: ev_files.c,v 1.5.18.3 2005/07/28 07:38:09 marka Exp $"; -#endif - -#include "port_before.h" -#include "fd_setsize.h" - -#include <sys/types.h> -#include <sys/time.h> -#include <sys/ioctl.h> - -#include <errno.h> -#include <fcntl.h> -#include <unistd.h> - -#include <isc/eventlib.h> -#include "eventlib_p.h" - -#include "port_after.h" - -static evFile *FindFD(const evContext_p *ctx, int fd, int eventmask); - -int -evSelectFD(evContext opaqueCtx, - int fd, - int eventmask, - evFileFunc func, - void *uap, - evFileID *opaqueID -) { - evContext_p *ctx = opaqueCtx.opaque; - evFile *id; - int mode; - - evPrintf(ctx, 1, - "evSelectFD(ctx %p, fd %d, mask 0x%x, func %p, uap %p)\n", - ctx, fd, eventmask, func, uap); - if (eventmask == 0 || (eventmask & ~EV_MASK_ALL) != 0) - EV_ERR(EINVAL); -#ifndef USE_POLL - if (fd > ctx->highestFD) - EV_ERR(EINVAL); -#endif - OK(mode = fcntl(fd, F_GETFL, NULL)); /*%< side effect: validate fd. */ - /* - * The first time we touch a file descriptor, we need to check to see - * if the application already had it in O_NONBLOCK mode and if so, all - * of our deselect()'s have to leave it in O_NONBLOCK. If not, then - * all but our last deselect() has to leave it in O_NONBLOCK. - */ -#ifdef USE_POLL - /* Make sure both ctx->pollfds[] and ctx->fdTable[] are large enough */ - if (fd >= ctx->maxnfds && evPollfdRealloc(ctx, 1, fd) != 0) - EV_ERR(ENOMEM); -#endif /* USE_POLL */ - id = FindFD(ctx, fd, EV_MASK_ALL); - if (id == NULL) { - if (mode & PORT_NONBLOCK) - FD_SET(fd, &ctx->nonblockBefore); - else { -#ifdef USE_FIONBIO_IOCTL - int on = 1; - OK(ioctl(fd, FIONBIO, (char *)&on)); -#else - OK(fcntl(fd, F_SETFL, mode | PORT_NONBLOCK)); -#endif - FD_CLR(fd, &ctx->nonblockBefore); - } - } - - /* - * If this descriptor is already in use, search for it again to see - * if any of the eventmask bits we want to set are already captured. - * We cannot usefully capture the same fd event more than once in the - * same context. - */ - if (id != NULL && FindFD(ctx, fd, eventmask) != NULL) - EV_ERR(ETOOMANYREFS); - - /* Allocate and fill. */ - OKNEW(id); - id->func = func; - id->uap = uap; - id->fd = fd; - id->eventmask = eventmask; - - /* - * Insert at head. Order could be important for performance if we - * believe that evGetNext()'s accesses to the fd_sets will be more - * serial and therefore more cache-lucky if the list is ordered by - * ``fd.'' We do not believe these things, so we don't do it. - * - * The interesting sequence is where GetNext() has cached a select() - * result and the caller decides to evSelectFD() on some descriptor. - * Since GetNext() starts at the head, it can miss new entries we add - * at the head. This is not a serious problem since the event being - * evSelectFD()'d for has to occur before evSelectFD() is called for - * the file event to be considered "missed" -- a real corner case. - * Maintaining a "tail" pointer for ctx->files would fix this, but I'm - * not sure it would be ``more correct.'' - */ - if (ctx->files != NULL) - ctx->files->prev = id; - id->prev = NULL; - id->next = ctx->files; - ctx->files = id; - - /* Insert into fd table. */ - if (ctx->fdTable[fd] != NULL) - ctx->fdTable[fd]->fdprev = id; - id->fdprev = NULL; - id->fdnext = ctx->fdTable[fd]; - ctx->fdTable[fd] = id; - - /* Turn on the appropriate bits in the {rd,wr,ex}Next fd_set's. */ - if (eventmask & EV_READ) - FD_SET(fd, &ctx->rdNext); - if (eventmask & EV_WRITE) - FD_SET(fd, &ctx->wrNext); - if (eventmask & EV_EXCEPT) - FD_SET(fd, &ctx->exNext); - - /* Update fdMax. */ - if (fd > ctx->fdMax) - ctx->fdMax = fd; - - /* Remember the ID if the caller provided us a place for it. */ - if (opaqueID) - opaqueID->opaque = id; - - return (0); -} - -int -evDeselectFD(evContext opaqueCtx, evFileID opaqueID) { - evContext_p *ctx = opaqueCtx.opaque; - evFile *del = opaqueID.opaque; - evFile *cur; - int mode, eventmask; - - if (!del) { - evPrintf(ctx, 11, "evDeselectFD(NULL) ignored\n"); - errno = EINVAL; - return (-1); - } - - evPrintf(ctx, 1, "evDeselectFD(fd %d, mask 0x%x)\n", - del->fd, del->eventmask); - - /* Get the mode. Unless the file has been closed, errors are bad. */ - mode = fcntl(del->fd, F_GETFL, NULL); - if (mode == -1 && errno != EBADF) - EV_ERR(errno); - - /* Remove from the list of files. */ - if (del->prev != NULL) - del->prev->next = del->next; - else - ctx->files = del->next; - if (del->next != NULL) - del->next->prev = del->prev; - - /* Remove from the fd table. */ - if (del->fdprev != NULL) - del->fdprev->fdnext = del->fdnext; - else - ctx->fdTable[del->fd] = del->fdnext; - if (del->fdnext != NULL) - del->fdnext->fdprev = del->fdprev; - - /* - * If the file descriptor does not appear in any other select() entry, - * and if !EV_WASNONBLOCK, and if we got no EBADF when we got the mode - * earlier, then: restore the fd to blocking status. - */ - if (!(cur = FindFD(ctx, del->fd, EV_MASK_ALL)) && - !FD_ISSET(del->fd, &ctx->nonblockBefore) && - mode != -1) { - /* - * Note that we won't return an error status to the caller if - * this fcntl() fails since (a) we've already done the work - * and (b) the caller didn't ask us anything about O_NONBLOCK. - */ -#ifdef USE_FIONBIO_IOCTL - int off = 0; - (void) ioctl(del->fd, FIONBIO, (char *)&off); -#else - (void) fcntl(del->fd, F_SETFL, mode & ~PORT_NONBLOCK); -#endif - } - - /* - * Now find all other uses of this descriptor and OR together an event - * mask so that we don't turn off {rd,wr,ex}Next bits that some other - * file event is using. As an optimization, stop if the event mask - * fills. - */ - eventmask = 0; - for ((void)NULL; - cur != NULL && eventmask != EV_MASK_ALL; - cur = cur->next) - if (cur->fd == del->fd) - eventmask |= cur->eventmask; - - /* OK, now we know which bits we can clear out. */ - if (!(eventmask & EV_READ)) { - FD_CLR(del->fd, &ctx->rdNext); - if (FD_ISSET(del->fd, &ctx->rdLast)) { - FD_CLR(del->fd, &ctx->rdLast); - ctx->fdCount--; - } - } - if (!(eventmask & EV_WRITE)) { - FD_CLR(del->fd, &ctx->wrNext); - if (FD_ISSET(del->fd, &ctx->wrLast)) { - FD_CLR(del->fd, &ctx->wrLast); - ctx->fdCount--; - } - } - if (!(eventmask & EV_EXCEPT)) { - FD_CLR(del->fd, &ctx->exNext); - if (FD_ISSET(del->fd, &ctx->exLast)) { - FD_CLR(del->fd, &ctx->exLast); - ctx->fdCount--; - } - } - - /* If this was the maxFD, find the new one. */ - if (del->fd == ctx->fdMax) { - ctx->fdMax = -1; - for (cur = ctx->files; cur; cur = cur->next) - if (cur->fd > ctx->fdMax) - ctx->fdMax = cur->fd; - } - - /* If this was the fdNext, cycle that to the next entry. */ - if (del == ctx->fdNext) - ctx->fdNext = del->next; - - /* Couldn't free it before now since we were using fields out of it. */ - FREE(del); - - return (0); -} - -static evFile * -FindFD(const evContext_p *ctx, int fd, int eventmask) { - evFile *id; - - for (id = ctx->fdTable[fd]; id != NULL; id = id->fdnext) - if (id->fd == fd && (id->eventmask & eventmask) != 0) - break; - return (id); -} - -/*! \file */ |
