!810 fix：优化修改epoll系统调用接口

Merge pull request !810 from Kiita/220224_epoll

fs/vfs/epoll/fs_epoll.c

@@ -164,23 +164,23 @@ static VOID DoEpollClose(struct epoll_head *epHead)
 }
 
 /**
- * epoll_create,
+ * epoll_create unsupported api
+ *
+ * epoll_create is implemented by calling epoll_create1, it's parameter 'size' is useless.
+ *
+ * epoll_create1,
  * The simple version of epoll does not use red-black trees,
  * so when fd is normal value (greater than 0),
  * actually allocated epoll can manage num of EPOLL_DEFAULT_SIZE
  *
- * @param size: not actually used
+ * @param flags: not actually used
  * @return epoll fd
  */
-int epoll_create(int size)
+int epoll_create1(int flags)
 {
+    (void)flags;
     int fd = -1;
 
-    if (size <= 0) {
-        set_errno(EINVAL);
-        return fd;
-    }
-
     struct epoll_head *epHead = (struct epoll_head *)malloc(sizeof(struct epoll_head));
     if (epHead == NULL) {
         set_errno(ENOMEM);

fs/vfs/include/epoll.h

@@ -72,7 +72,7 @@ struct epoll_event {
     epoll_data_t data;
 };
 
-int epoll_create(int size);
+int epoll_create1(int flags);
 int epoll_close(int epfd);
 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *ev);
 int epoll_wait(int epfd, FAR struct epoll_event *evs, int maxevents, int timeout);

syscall/fs_syscall.c

@@ -2601,18 +2601,15 @@ int SysPselect6(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
     return ret;
 }
 
-int SysEpollCreate(int size)
+static int DoEpollCreate1(int flags)
 {
     int ret;
     int procFd;
 
-    if (size <= 0) {
-        return -EINVAL;
-    }
-
-    ret = epoll_create(size);
+    ret = epoll_create1(flags);
     if (ret < 0) {
         ret = -get_errno();
+        return ret;
     }
 
     procFd = AllocAndAssocProcessFd((INTPTR)(ret), MIN_START_FD);
@@ -2624,23 +2621,15 @@ int SysEpollCreate(int size)
     return procFd;
 }
 
-int SysEpollCreate1(int flags)
+int SysEpollCreate(int size)
 {
-    int ret;
-    int procFd;
-
-    ret = epoll_create(flags);
-    if (ret < 0) {
-        ret = -get_errno();
-    }
-
-    procFd = AllocAndAssocProcessFd((INTPTR)(ret), MIN_START_FD);
-    if (procFd == -1) {
-        epoll_close(ret);
-        return -EMFILE;
-    }
+    (void)size;
+    return DoEpollCreate1(0);
+}
 
-    return procFd;
+int SysEpollCreate1(int flags)
+{
+    return DoEpollCreate1(flags);
 }
 
 int SysEpollCtl(int epfd, int op, int fd, struct epoll_event *ev)