+
+ if((val = fcntl(fd, F_GETFL, 0)) == -1)
+ return;
+ if (!(val & NONBLOCK_FLAG)) {
+ val |= NONBLOCK_FLAG;
+ fcntl(fd, F_SETFL, val);
+ }
+}
+
+
+/* create a file descriptor pair - like pipe() but use socketpair if
+ possible (because of blocking issues on pipes)
+
+ always set non-blocking
+ */
+int fd_pair(int fd[2])
+{
+ int ret;
+
+#if HAVE_SOCKETPAIR
+ ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);