posix: define nfds_t in posix/poll.h

Add the nfds_t type defined by POSIX and test for it.

Signed-off-by: Jakub Michalski <[email protected]>
Signed-off-by: Maciej Sobkowski <[email protected]>

Author: jmichalski-ant

include/zephyr/posix/poll.h

@@ -12,6 +12,8 @@
 extern "C" {
 #endif
 
+typedef	unsigned int nfds_t;
+
 #define pollfd zsock_pollfd
 
 #define POLLIN ZSOCK_POLLIN

tests/posix/headers/src/poll_h.c

@@ -23,7 +23,7 @@ ZTEST(posix_headers, test_poll_h)
 	zassert_not_equal(-1, offsetof(struct pollfd, events));
 	zassert_not_equal(-1, offsetof(struct pollfd, revents));
 
-	/* zassert_true(sizeof(nfds_t) <= sizeof(long)); */ /* not implemented */
+	zassert_true(sizeof(nfds_t) <= sizeof(long));
 
 	zassert_not_equal(-1, POLLIN);
 	/* zassert_not_equal(-1, POLLRDNORM); */ /* not implemented */