librdmacm: ensure poll handles normal file descriptors correctly

When using rdma-core's preload library, the poll function needs to
correctly distinguish between rsocket-managed fds and normal fds.
This change ensures that pollfd structures are properly prepared and
the call is routed to either the native poll or rpoll based on the
actual fd type.

Signed-off-by: zhangwenge <zhangwengege@126.com>

Author: kaolamall

librdmacm/preload.c

@@ -966,16 +966,10 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 {
 	struct pollfd *rfds;
 	int i, ret;
+	int has_rsocket = 0;
 
 	init_preload();
-	for (i = 0; i < nfds; i++) {
-		if (fd_gett(fds[i].fd) == fd_rsocket)
-			goto use_rpoll;
-	}
 
-	return real.poll(fds, nfds, timeout);
-
-use_rpoll:
 	rfds = fds_alloc(nfds);
 	if (!rfds)
 		return ERR(ENOMEM);
@@ -984,9 +978,15 @@ int poll(struct pollfd *fds, nfds_t nfds, int timeout)
 		rfds[i].fd = fd_getd(fds[i].fd);
 		rfds[i].events = fds[i].events;
 		rfds[i].revents = 0;
+
+		if (fd_gett(fds[i].fd) == fd_rsocket)
+			has_rsocket = 1;
 	}
 
-	ret = rpoll(rfds, nfds, timeout);
+	if (!has_rsocket)
+		ret = real.poll(rfds, nfds, timeout);
+	else
+		ret = rpoll(rfds, nfds, timeout);
 
 	for (i = 0; i < nfds; i++)
 		fds[i].revents = rfds[i].revents;