--- /dev/null
+/*
+ ashd - A Sane HTTP Daemon
+ Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/event.h>
+#include <errno.h>
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <log.h>
+#include <utils.h>
+#include <mt.h>
+#include <mtio.h>
+
+static struct blocker *blockers;
+
+struct blocker {
+ struct blocker *n, *p, *n2, *p2;
+ int fd, reg;
+ int ev, rev, id;
+ time_t to;
+ struct muth *th;
+};
+
+static int qfd = -1, fdln = 0;
+static int exitstatus;
+static struct blocker **fdlist;
+
+static int regfd(struct blocker *bl)
+{
+ struct blocker *o;
+ int prev;
+ struct kevent evd;
+
+ if(bl->fd >= fdln) {
+ if(fdlist) {
+ fdlist = srealloc(fdlist, sizeof(*fdlist) * (bl->fd + 1));
+ memset(fdlist + fdln, 0, sizeof(*fdlist) * (bl->fd + 1 - fdln));
+ fdln = bl->fd + 1;
+ } else {
+ fdlist = szmalloc(sizeof(*fdlist) * (fdln = (bl->fd + 1)));
+ }
+ }
+ for(prev = 0, o = fdlist[bl->fd]; o; o = o->n2)
+ prev |= o->ev;
+ if((bl->ev & EV_READ) && !(prev & EV_READ)) {
+ evd = (struct kevent) {
+ .flags = EV_ADD,
+ .ident = bl->fd,
+ .filter = EVFILT_READ,
+ };
+ if(kevent(qfd, &evd, 1, NULL, 0, NULL) < 0) {
+ /* XXX?! Whatever to do, really? */
+ flog(LOG_ERR, "kevent(EV_ADD, EVFILT_READ) on fd %i: %s", bl->fd, strerror(errno));
+ return(-1);
+ }
+ }
+ if((bl->ev & EV_WRITE) && !(prev & EV_WRITE)) {
+ evd = (struct kevent) {
+ .flags = EV_ADD,
+ .ident = bl->fd,
+ .filter = EVFILT_WRITE,
+ };
+ if(kevent(qfd, &evd, 1, NULL, 0, NULL) < 0) {
+ /* XXX?! Whatever to do, really? */
+ flog(LOG_ERR, "kevent(EV_ADD, EVFILT_WRITE) on fd %i: %s", bl->fd, strerror(errno));
+ return(-1);
+ }
+ }
+ bl->n2 = fdlist[bl->fd];
+ bl->p2 = NULL;
+ if(fdlist[bl->fd] != NULL)
+ fdlist[bl->fd]->p2 = bl;
+ fdlist[bl->fd] = bl;
+ bl->reg = 1;
+ return(0);
+}
+
+static void remfd(struct blocker *bl)
+{
+ struct blocker *o;
+ struct kevent evd;
+ int left;
+
+ if(!bl->reg)
+ return;
+ if(bl->n2)
+ bl->n2->p2 = bl->p2;
+ if(bl->p2)
+ bl->p2->n2 = bl->n2;
+ if(bl == fdlist[bl->fd])
+ fdlist[bl->fd] = bl->n2;
+ for(left = 0, o = fdlist[bl->fd]; o; o = o->n2)
+ left |= o->ev;
+ if((bl->ev & EV_READ) && !(left & EV_READ)) {
+ evd = (struct kevent) {
+ .flags = EV_DELETE,
+ .ident = bl->fd,
+ .filter = EVFILT_READ,
+ };
+ if(kevent(qfd, &evd, 1, NULL, 0, NULL) < 0) {
+ /* XXX?! Whatever to do, really? */
+ flog(LOG_ERR, "kevent(EV_DELETE, EVFILT_READ) on fd %i: %s", bl->fd, strerror(errno));
+ }
+ }
+ if((bl->ev & EV_WRITE) && !(left & EV_WRITE)) {
+ evd = (struct kevent) {
+ .flags = EV_DELETE,
+ .ident = bl->fd,
+ .filter = EVFILT_WRITE,
+ };
+ if(kevent(qfd, &evd, 1, NULL, 0, NULL) < 0) {
+ /* XXX?! Whatever to do, really? */
+ flog(LOG_ERR, "kevent(EV_DELETE, EVFILT_WRITE) on fd %i: %s", bl->fd, strerror(errno));
+ }
+ }
+ bl->reg = 0;
+}
+
+static int addblock(struct blocker *bl)
+{
+ if((qfd >= 0) && regfd(bl))
+ return(-1);
+ bl->n = blockers;
+ if(blockers)
+ blockers->p = bl;
+ blockers = bl;
+ return(0);
+}
+
+static void remblock(struct blocker *bl)
+{
+ if(bl->n)
+ bl->n->p = bl->p;
+ if(bl->p)
+ bl->p->n = bl->n;
+ if(bl == blockers)
+ blockers = bl->n;
+ remfd(bl);
+}
+
+struct selected mblock(time_t to, int n, struct selected *spec)
+{
+ int i, id;
+ struct blocker bls[n];
+
+ to = (to > 0)?(time(NULL) + to):0;
+ for(i = 0; i < n; i++) {
+ bls[i] = (struct blocker) {
+ .fd = spec[i].fd,
+ .ev = spec[i].ev,
+ .id = i,
+ .to = to,
+ .th = current,
+ };
+ if(addblock(&bls[i])) {
+ for(i--; i >= 0; i--)
+ remblock(&bls[i]);
+ return((struct selected){.fd = -1, .ev = -1});
+ }
+ }
+ id = yield();
+ for(i = 0; i < n; i++)
+ remblock(&bls[i]);
+ if(id < 0)
+ return((struct selected){.fd = -1, .ev = -1});
+ return((struct selected){.fd = bls[id].fd, .ev = bls[id].rev});
+}
+
+int block(int fd, int ev, time_t to)
+{
+ struct blocker bl;
+ int rv;
+
+ bl = (struct blocker) {
+ .fd = fd,
+ .ev = ev,
+ .id = -1,
+ .to = (to > 0)?(time(NULL) + to):0,
+ .th = current,
+ };
+ addblock(&bl);
+ rv = yield();
+ remblock(&bl);
+ return(rv);
+}
+
+int ioloop(void)
+{
+ struct blocker *bl, *nbl;
+ struct kevent evs[16];
+ int i, fd, nev, ev;
+ time_t now, timeout;
+ struct timespec *toval;
+
+ exitstatus = 0;
+ qfd = kqueue();
+ fcntl(qfd, F_SETFD, FD_CLOEXEC);
+ for(bl = blockers; bl; bl = nbl) {
+ nbl = bl->n;
+ if(regfd(bl))
+ resume(bl->th, -1);
+ }
+ while(blockers != NULL) {
+ timeout = 0;
+ for(bl = blockers; bl; bl = bl->n) {
+ if((bl->to != 0) && ((timeout == 0) || (timeout > bl->to)))
+ timeout = bl->to;
+ }
+ now = time(NULL);
+ if(timeout == 0)
+ toval = NULL;
+ else if(timeout > now)
+ toval = &(struct timespec){.tv_sec = timeout - now};
+ else
+ toval = &(struct timespec){.tv_sec = 1};
+ if(exitstatus)
+ break;
+ nev = kevent(qfd, NULL, 0, evs, sizeof(evs) / sizeof(*evs), toval);
+ if(nev < 0) {
+ if(errno != EINTR) {
+ flog(LOG_CRIT, "ioloop: kevent errored out: %s", strerror(errno));
+ /* To avoid CPU hogging in case it's bad, which it
+ * probably is. */
+ sleep(1);
+ }
+ continue;
+ }
+ for(i = 0; i < nev; i++) {
+ fd = (int)evs[i].ident;
+ ev = (evs[i].filter == EVFILT_READ)?EV_READ:EV_WRITE;
+ for(bl = fdlist[fd]; bl; bl = nbl) {
+ nbl = bl->n2;
+ if(ev & bl->ev) {
+ if(bl->id < 0) {
+ resume(bl->th, ev);
+ } else {
+ bl->rev = ev;
+ resume(bl->th, bl->id);
+ }
+ }
+ }
+ }
+ now = time(NULL);
+ for(bl = blockers; bl; bl = nbl) {
+ nbl = bl->n;
+ if((bl->to != 0) && (bl->to <= now)) {
+ if(bl->id < 0) {
+ resume(bl->th, 0);
+ } else {
+ bl->rev = 0;
+ resume(bl->th, bl->id);
+ }
+ }
+ }
+ }
+ for(bl = blockers; bl; bl = bl->n)
+ remfd(bl);
+ close(qfd);
+ qfd = -1;
+ return(exitstatus);
+}
+
+void exitioloop(int status)
+{
+ exitstatus = status;
+}
Dolda2000 GitWeb / ashd.git / blobdiff