1. bugFix: typo in eok.c which results in memory leakage

2. for the sake of SIGALRM used in the base code, add taos_block_sigalrm and so forth
3. TODO: getaddrinfo would block a few unnecessary seconds when host ~ *.local
         better give warning/suggestion message to user, or just bypass getaddrinfo
         and fail the function

src/os/inc/eok.h

@@ -22,6 +22,8 @@
 extern "C" {
 #endif
 
+#ifdef __APPLE__
+
 enum EPOLL_EVENTS
   {
     EPOLLIN = 0x001,
@@ -81,6 +83,8 @@ int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
 int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout);
 int epoll_close(int epfd);
 
+#endif // __APPLE__
+
 #ifdef __cplusplus
 }
 #endif

src/os/inc/osDarwin.h

@@ -104,6 +104,8 @@ int64_t tsosStr2int64(char *str);
 
 #include "eok.h"
 
+void taos_block_sigalrm(void);
+
 
 
 

src/os/src/darwin/darwinTimer.c

@@ -34,3 +34,16 @@ void taosUninitTimer() {
   setitimer(ITIMER_REAL, &tv, NULL);
 }
 
+void taos_block_sigalrm(void) {
+  // since SIGALRM has been used
+  // consideration: any better solution?
+  static __thread int already_set = 0;
+  if (!already_set) {
+    sigset_t set;
+    sigemptyset(&set);
+    sigaddset(&set, SIGALRM);
+    pthread_sigmask(SIG_BLOCK, &set, NULL);
+    already_set = 1;
+  }
+}
+

src/os/src/darwin/eok.c

@@ -15,15 +15,11 @@
 
 #include "eok.h"
 
-#include <errno.h>
-#include <libgen.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+#include "os.h"
+
 #include <sys/event.h>
-#include <sys/socket.h>
-#include <unistd.h>
+
+#define LET_IT_BE
 
 #ifdef ENABLE_LOG
 #define D(fmt, ...) fprintf(stderr, "%s[%d]%s(): " fmt "\n", basename(__FILE__), __LINE__, __func__, ##__VA_ARGS__)
@@ -414,6 +410,8 @@ int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event) {
 static struct timespec do_timespec_diff(struct timespec *from, struct timespec *to);
 
 int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout) {
+  taos_block_sigalrm();
+
   int e = 0;
   if (!events) {
     errno = EINVAL;
@@ -699,7 +697,7 @@ static void eok_free_ev(ep_over_kq_t *eok, eok_event_t *ev) {
   else          eok->evs_tail  = ev->prev;
   ev->prev = NULL;
   ev->next = eok->evs_free;
-  eok->evs_free = ev->next;
+  eok->evs_free = ev;
 
   eok->evs_count -= 1;
 }

src/os/src/detail/osTimer.c

@@ -116,6 +116,9 @@ void taosUninitTimer() {
   pthread_sigmask(SIG_BLOCK, &set, NULL);
 */
 void taosMsleep(int mseconds) {
+#ifdef __APPLE__
+  taos_block_sigalrm();
+#endif // __APPLE__
 #if 1
   usleep(mseconds * 1000);
 #else
@@ -136,6 +139,7 @@ void taosMsleep(int mseconds) {
 
 /* pthread_sigmask(SIG_UNBLOCK, &set, NULL); */
 #endif
+
 }
 
-#endif
\ No newline at end of file
+#endif