sockets: new Curl_socket_check() can wait for 3 sockets

This offers an alternative to the existing Curl_socket_ready() API which
only checks one socket for read and one for write.

1 files changed, 11 insertions, 1 deletions

diff --git a/lib/select.h b/lib/select.h
index 56729a3b2..b50604b0a 100644
--- a/lib/select.h
+++ b/lib/select.h
@@ -84,9 +84,19 @@ struct pollfd
 #define POLLRDBAND POLLPRI
 #endif
 
-int Curl_socket_ready(curl_socket_t readfd, curl_socket_t writefd,
+/* there are three CSELECT defines that are defined in the public header that
+   are exposed to users, but this *IN2 bit is only ever used internally and
+   therefore defined here */
+#define CURL_CSELECT_IN2 (CURL_CSELECT_ERR << 1)
+
+int Curl_socket_check(curl_socket_t readfd, curl_socket_t readfd2,
+                      curl_socket_t writefd,
                       long timeout_ms);
 
+/* provide the former API internally */
+#define Curl_socket_ready(x,y,z) \
+  Curl_socket_check(x, CURL_SOCKET_BAD, y, z)
+
 int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
 
 int Curl_wait_ms(int timeout_ms);