From f2163cb4a1fdc0c1433c2019b7d7a88d9efb5b65 Mon Sep 17 00:00:00 2001
From: peter <peter@FreeBSD.org>
Date: Fri, 27 Jun 1997 13:00:51 +0000
Subject: Dynamically size fd_set in select rather than fail if too many files
 are open. Obtained from: OpenBSD; by deraadt and dm

---
 lib/libc/net/res_send.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'lib/libc/net/res_send.c')

diff --git a/lib/libc/net/res_send.c b/lib/libc/net/res_send.c
index a89e67b..798d0f6 100644
--- a/lib/libc/net/res_send.c
+++ b/lib/libc/net/res_send.c
@@ -56,7 +56,7 @@
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)res_send.c	8.1 (Berkeley) 6/4/93";
 static char orig_rcsid[] = "From: Id: res_send.c,v 8.13 1997/06/01 20:34:37 vixie Exp";
-static char rcsid[] = "$Id: res_send.c,v 1.15 1997/03/12 11:10:54 peter Exp $";
+static char rcsid[] = "$Id: res_send.c,v 1.16 1997/06/27 08:22:03 peter Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 /*
@@ -469,7 +469,7 @@ read_len:
 			 * Use datagrams.
 			 */
 			struct timeval timeout;
-			fd_set dsmask;
+			fd_set *dsmaskp;
 			struct sockaddr_in from;
 			int fromlen;
 
@@ -574,16 +574,17 @@ read_len:
 			if ((long) timeout.tv_sec <= 0)
 				timeout.tv_sec = 1;
 			timeout.tv_usec = 0;
-			if (s+1 > FD_SETSIZE) {
-				Perror(stderr, "s+1 > FD_SETSIZE", EMFILE);
+    wait:
+			dsmaskp = (fd_set *)calloc(howmany(s+1, NFDBITS),
+						   sizeof(fd_mask));
+			if (dsmaskp == NULL) {
 				res_close();
 				goto next_ns;
 			}
-    wait:
-			FD_ZERO(&dsmask);
-			FD_SET(s, &dsmask);
-			n = select(s+1, &dsmask, (fd_set *)NULL,
+			FD_SET(s, dsmaskp);
+			n = select(s+1, dsmaskp, (fd_set *)NULL,
 				   (fd_set *)NULL, &timeout);
+			free(dsmaskp);
 			if (n < 0) {
 				if (errno == EINTR)
 					goto wait;
-- 
cgit v1.1