Top level directory reorg
Move src/po -> po Combine common and compat -> lib/util Move zlib -> lib/zlib
This commit is contained in:
Todd C. Miller
183
lib/util/event_poll.c
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183
lib/util/event_poll.c
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/*
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* Copyright (c) 2013-2014 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# include "compat/stdbool.h"
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#endif /* HAVE_STDBOOL_H */
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <errno.h>
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#include <poll.h>
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#include "missing.h"
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#include "alloc.h"
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#include "fatal.h"
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#include "sudo_debug.h"
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#include "sudo_event.h"
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/* XXX - use non-exiting allocators? */
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int
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sudo_ev_base_alloc_impl(struct sudo_event_base *base)
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{
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int i;
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debug_decl(sudo_ev_base_alloc_impl, SUDO_DEBUG_EVENT)
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base->pfd_high = -1;
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base->pfd_max = 32;
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base->pfds = ereallocarray(NULL, base->pfd_max, sizeof(struct pollfd));
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for (i = 0; i < base->pfd_max; i++) {
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base->pfds[i].fd = -1;
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}
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debug_return_int(0);
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}
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void
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sudo_ev_base_free_impl(struct sudo_event_base *base)
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{
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debug_decl(sudo_ev_base_free_impl, SUDO_DEBUG_EVENT)
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efree(base->pfds);
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debug_return;
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}
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int
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sudo_ev_add_impl(struct sudo_event_base *base, struct sudo_event *ev)
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{
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struct pollfd *pfd;
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debug_decl(sudo_ev_add_impl, SUDO_DEBUG_EVENT)
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/* If out of space in pfds array, realloc. */
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if (base->pfd_free == base->pfd_max) {
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int i;
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base->pfd_max <<= 1;
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base->pfds =
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ereallocarray(base->pfds, base->pfd_max, sizeof(struct pollfd));
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for (i = base->pfd_free; i < base->pfd_max; i++) {
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base->pfds[i].fd = -1;
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}
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}
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/* Fill in pfd entry. */
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ev->pfd_idx = base->pfd_free;
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pfd = &base->pfds[ev->pfd_idx];
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pfd->fd = ev->fd;
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pfd->events = 0;
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if (ISSET(ev->events, SUDO_EV_READ))
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pfd->events |= POLLIN;
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if (ISSET(ev->events, SUDO_EV_WRITE))
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pfd->events |= POLLOUT;
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/* Update pfd_high and pfd_free. */
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if (ev->pfd_idx > base->pfd_high)
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base->pfd_high = ev->pfd_idx;
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for (;;) {
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if (++base->pfd_free == base->pfd_max)
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break;
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if (base->pfds[base->pfd_free].fd == -1)
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break;
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}
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debug_return_int(0);
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}
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int
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sudo_ev_del_impl(struct sudo_event_base *base, struct sudo_event *ev)
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{
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debug_decl(sudo_ev_del_impl, SUDO_DEBUG_EVENT)
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/* Mark pfd entry unused, add to free list and adjust high slot. */
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base->pfds[ev->pfd_idx].fd = -1;
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if (ev->pfd_idx < base->pfd_free)
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base->pfd_free = ev->pfd_idx;
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while (base->pfd_high >= 0 && base->pfds[base->pfd_high].fd == -1)
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base->pfd_high--;
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debug_return_int(0);
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}
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int
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sudo_ev_scan_impl(struct sudo_event_base *base, int flags)
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{
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struct sudo_event *ev;
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int nready, timeout;
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struct timeval now;
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debug_decl(sudo_ev_scan_impl, SUDO_DEBUG_EVENT)
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if ((ev = TAILQ_FIRST(&base->timeouts)) != NULL) {
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struct timeval *timo = &ev->timeout;
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gettimeofday(&now, NULL);
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timeout = ((timo->tv_sec - now.tv_sec) * 1000) +
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((timo->tv_usec - now.tv_usec) / 1000);
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if (timeout <= 0)
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timeout = 0;
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} else {
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timeout = (flags & SUDO_EVLOOP_NONBLOCK) ? 0 : -1;
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}
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nready = poll(base->pfds, base->pfd_high + 1, timeout);
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sudo_debug_printf(SUDO_DEBUG_INFO, "%s: %d fds ready", __func__, nready);
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switch (nready) {
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case -1:
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/* Error or interrupted by signal. */
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debug_return_int(-1);
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case 0:
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/* Front end will activate timeout events. */
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break;
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default:
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/* Activate each I/O event that fired. */
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TAILQ_FOREACH(ev, &base->events, entries) {
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if (ev->pfd_idx != -1 && base->pfds[ev->pfd_idx].revents) {
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int what = 0;
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if (base->pfds[ev->pfd_idx].revents & (POLLIN|POLLHUP|POLLNVAL|POLLERR))
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what |= (ev->events & SUDO_EV_READ);
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if (base->pfds[ev->pfd_idx].revents & (POLLOUT|POLLHUP|POLLNVAL|POLLERR))
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what |= (ev->events & SUDO_EV_WRITE);
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/* Make event active. */
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sudo_debug_printf(SUDO_DEBUG_DEBUG,
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"%s: polled fd %d, events %d, activating %p",
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__func__, ev->fd, what, ev);
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ev->revents = what;
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TAILQ_INSERT_TAIL(&base->active, ev, active_entries);
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SET(ev->flags, SUDO_EVQ_ACTIVE);
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}
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}
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break;
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}
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debug_return_int(nready);
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}
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