Replace use of select with poll in *wait_select in libckpool to allow high fds

src/libckpool.c

@@ -29,6 +29,7 @@
 #include <sys/time.h>
 #include <time.h>
 #include <math.h>
+#include <poll.h>
 
 #include "libckpool.h"
 #include "sha2.h"
@@ -704,17 +705,17 @@ out:
 	return sockd;
 }
 
+/* Emulate a select read wait for high fds that select doesn't support */
 int wait_read_select(int sockd, int timeout)
 {
-	tv_t tv_timeout;
-	fd_set readfs;
-
-	tv_timeout.tv_sec = timeout;
-	tv_timeout.tv_usec = 0;
+	struct pollfd sfd;
+	int ret;
 
-	FD_ZERO(&readfs);
-	FD_SET(sockd, &readfs);
-	return select(sockd + 1, &readfs, NULL, NULL, &tv_timeout);
+	sfd.fd = sockd;
+	sfd.events = POLLIN;
+	sfd.revents = 0;
+	timeout *= 1000;
+	return poll(&sfd, 1, timeout);
 }
 
 int read_length(int sockd, void *buf, int len)
@@ -778,17 +779,17 @@ out:
 	return buf;
 }
 
+/* Emulate a select write wait for high fds that select doesn't support */
 int wait_write_select(int sockd, int timeout)
 {
-	tv_t tv_timeout;
-	fd_set writefds;
-
-	tv_timeout.tv_sec = timeout;
-	tv_timeout.tv_usec = 0;
+	struct pollfd sfd;
+	int ret;
 
-	FD_ZERO(&writefds);
-	FD_SET(sockd, &writefds);
-	return select(sockd + 1, NULL, &writefds, NULL, &tv_timeout);
+	sfd.fd = sockd;
+	sfd.events = POLLOUT;
+	sfd.revents = 0;
+	timeout *= 1000;
+	return poll(&sfd, 1, timeout);
 }
 
 int write_length(int sockd, const void *buf, int len)