Adding upstream version 1.8.27.upstream/1.8.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/lib/util/event_poll.c b/lib/util/event_poll.c
new file mode 100644
index 0000000..22cda24
--- /dev/null
+++ b/lib/util/event_poll.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2013-2015 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif /* HAVE_STDBOOL_H */
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <time.h>
+#include <unistd.h>
+#include <errno.h>
+#include <poll.h>
+
+#include "sudo_compat.h"
+#include "sudo_util.h"
+#include "sudo_fatal.h"
+#include "sudo_debug.h"
+#include "sudo_event.h"
+
+int
+sudo_ev_base_alloc_impl(struct sudo_event_base *base)
+{
+    int i;
+    debug_decl(sudo_ev_base_alloc_impl, SUDO_DEBUG_EVENT)
+
+    base->pfd_high = -1;
+    base->pfd_max = 32;
+    base->pfds = reallocarray(NULL, base->pfd_max, sizeof(struct pollfd));
+    if (base->pfds == NULL) {
+	sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+	    "%s: unable to allocate %d pollfds", __func__, base->pfd_max);
+	base->pfd_max = 0;
+	debug_return_int(-1);
+    }
+    for (i = 0; i < base->pfd_max; i++) {
+	base->pfds[i].fd = -1;
+    }
+
+    debug_return_int(0);
+}
+
+void
+sudo_ev_base_free_impl(struct sudo_event_base *base)
+{
+    debug_decl(sudo_ev_base_free_impl, SUDO_DEBUG_EVENT)
+    free(base->pfds);
+    debug_return;
+}
+
+int
+sudo_ev_add_impl(struct sudo_event_base *base, struct sudo_event *ev)
+{
+    struct pollfd *pfd;
+    debug_decl(sudo_ev_add_impl, SUDO_DEBUG_EVENT)
+
+    /* If out of space in pfds array, realloc. */
+    if (base->pfd_free == base->pfd_max) {
+	struct pollfd *pfds;
+	int i;
+
+	pfds =
+	    reallocarray(base->pfds, base->pfd_max, 2 * sizeof(struct pollfd));
+	if (pfds == NULL) {
+	    sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
+		"%s: unable to allocate %d pollfds", __func__, base->pfd_max * 2);
+	    debug_return_int(-1);
+	}
+	base->pfds = pfds;
+	base->pfd_max *= 2;
+	for (i = base->pfd_free; i < base->pfd_max; i++) {
+	    base->pfds[i].fd = -1;
+	}
+    }
+
+    /* Fill in pfd entry. */
+    ev->pfd_idx = base->pfd_free;
+    pfd = &base->pfds[ev->pfd_idx];
+    pfd->fd = ev->fd;
+    pfd->events = 0;
+    if (ISSET(ev->events, SUDO_EV_READ))
+	pfd->events |= POLLIN;
+    if (ISSET(ev->events, SUDO_EV_WRITE))
+	pfd->events |= POLLOUT;
+
+    /* Update pfd_high and pfd_free. */
+    if (ev->pfd_idx > base->pfd_high)
+	base->pfd_high = ev->pfd_idx;
+    for (;;) {
+	if (++base->pfd_free == base->pfd_max)
+	    break;
+	if (base->pfds[base->pfd_free].fd == -1)
+	    break;
+    }
+
+    debug_return_int(0);
+}
+
+int
+sudo_ev_del_impl(struct sudo_event_base *base, struct sudo_event *ev)
+{
+    debug_decl(sudo_ev_del_impl, SUDO_DEBUG_EVENT)
+
+    /* Mark pfd entry unused, add to free list and adjust high slot. */
+    base->pfds[ev->pfd_idx].fd = -1;
+    if (ev->pfd_idx < base->pfd_free)
+	base->pfd_free = ev->pfd_idx;
+    while (base->pfd_high >= 0 && base->pfds[base->pfd_high].fd == -1)
+	base->pfd_high--;
+
+    debug_return_int(0);
+}
+
+#ifdef HAVE_PPOLL
+static int
+sudo_ev_poll(struct pollfd *fds, nfds_t nfds, const struct timespec *timo)
+{
+    return ppoll(fds, nfds, timo, NULL);
+}
+#else
+static int
+sudo_ev_poll(struct pollfd *fds, nfds_t nfds, const struct timespec *timo)
+{
+    const int timeout =
+	timo ? (timo->tv_sec * 1000) + (timo->tv_nsec / 1000000) : -1;
+
+    return poll(fds, nfds, timeout);
+}
+#endif /* HAVE_PPOLL */
+
+int
+sudo_ev_scan_impl(struct sudo_event_base *base, int flags)
+{
+    struct timespec now, ts, *timeout;
+    struct sudo_event *ev;
+    int nready;
+    debug_decl(sudo_ev_scan_impl, SUDO_DEBUG_EVENT)
+
+    if ((ev = TAILQ_FIRST(&base->timeouts)) != NULL) {
+	sudo_gettime_mono(&now);
+	sudo_timespecsub(&ev->timeout, &now, &ts);
+	if (ts.tv_sec < 0)
+	    sudo_timespecclear(&ts);
+	timeout = &ts;
+    } else {
+	if (ISSET(flags, SUDO_EVLOOP_NONBLOCK)) {
+	    sudo_timespecclear(&ts);
+	    timeout = &ts;
+	} else {
+	    timeout = NULL;
+	}
+    }
+
+    nready = sudo_ev_poll(base->pfds, base->pfd_high + 1, timeout);
+    sudo_debug_printf(SUDO_DEBUG_INFO, "%s: %d fds ready", __func__, nready);
+    switch (nready) {
+    case -1:
+	/* Error or interrupted by signal. */
+	debug_return_int(-1);
+    case 0:
+	/* Front end will activate timeout events. */
+	break;
+    default:
+	/* Activate each I/O event that fired. */
+	TAILQ_FOREACH(ev, &base->events, entries) {
+	    if (ev->pfd_idx != -1 && base->pfds[ev->pfd_idx].revents) {
+		int what = 0;
+		if (base->pfds[ev->pfd_idx].revents & (POLLIN|POLLHUP|POLLNVAL|POLLERR))
+		    what |= (ev->events & SUDO_EV_READ);
+		if (base->pfds[ev->pfd_idx].revents & (POLLOUT|POLLHUP|POLLNVAL|POLLERR))
+		    what |= (ev->events & SUDO_EV_WRITE);
+		/* Make event active. */
+		sudo_debug_printf(SUDO_DEBUG_DEBUG,
+		    "%s: polled fd %d, events %d, activating %p",
+		    __func__, ev->fd, what, ev);
+		ev->revents = what;
+		sudo_ev_activate(base, ev);
+	    }
+	}
+	break;
+    }
+    debug_return_int(nready);
+}