posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/select.c

Index: third_party/libevent/select.c
diff --git a/third_party/libevent/select.c b/third_party/libevent/select.c
index 7faafe4ec12a899c709adfa87ca37543465fd633..3f73331317749bee6f161fc3d7cda4cd9b36dc7c 100644
--- a/third_party/libevent/select.c
+++ b/third_party/libevent/select.c
@@ -34,7 +34,7 @@
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
 #else
-#include <sys/_time.h>
+#include <sys/_libevent_time.h>
 #endif
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
@@ -51,6 +51,7 @@
 #endif
 
 #include "event.h"
+#include "evutil.h"
 #include "event-internal.h"
 #include "evsignal.h"
 #include "log.h"
@@ -59,6 +60,13 @@
 #define        howmany(x, y)   (((x)+((y)-1))/(y))
 #endif
 
+#ifndef _EVENT_HAVE_FD_MASK
+/* This type is mandatory, but Android doesn't define it. */
+#undef NFDBITS
+#define NFDBITS (sizeof(long)*8)
+typedef unsigned long fd_mask;
+#endif
+
 struct selectop {
 	int event_fds;		/* Highest fd in fd set */
 	int event_fdsz;
@@ -94,7 +102,7 @@ select_init(struct event_base *base)
 	struct selectop *sop;
 
 	/* Disable select when this environment variable is set */
-	if (getenv("EVENT_NOSELECT"))
+	if (evutil_getenv("EVENT_NOSELECT"))
 		return (NULL);
 
 	if (!(sop = calloc(1, sizeof(struct selectop))))
@@ -137,7 +145,7 @@ check_selectop(struct selectop *sop)
 static int
 select_dispatch(struct event_base *base, void *arg, struct timeval *tv)
 {
-	int res, i;
+	int res, i, j;
 	struct selectop *sop = arg;
 
 	check_selectop(sop);
@@ -167,8 +175,12 @@ select_dispatch(struct event_base *base, void *arg, struct timeval *tv)
 	event_debug(("%s: select reports %d", __func__, res));
 
 	check_selectop(sop);
-	for (i = 0; i <= sop->event_fds; ++i) {
+	i = random() % (sop->event_fds+1);
+	for (j = 0; j <= sop->event_fds; ++j) {
 		struct event *r_ev = NULL, *w_ev = NULL;
+		if (++i >= sop->event_fds+1)
+			i = 0;
+
 		res = 0;
 		if (FD_ISSET(i, sop->event_readset_out)) {
 			r_ev = sop->event_r_by_fd[i];