1 files changed, 18 insertions, 5 deletions

diff --git a/monitor_fdpass.c b/monitor_fdpass.c
index 4b9a066bc..7eb6f5c6e 100644
--- a/monitor_fdpass.c
+++ b/monitor_fdpass.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor_fdpass.c,v 1.18 2008/11/30 11:59:26 dtucker Exp $ */
+/* $OpenBSD: monitor_fdpass.c,v 1.19 2010/01/12 00:58:25 djm Exp $ */
 /*
  * Copyright 2001 Niels Provos <provos@citi.umich.edu>
  * All rights reserved.
@@ -34,6 +34,9 @@
 #endif
 
 #include <errno.h>
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
 #include <string.h>
 #include <stdarg.h>
 
@@ -55,6 +58,7 @@ mm_send_fd(int sock, int fd)
         struct iovec vec;
         char ch = '\0';
         ssize_t n;
+        struct pollfd pfd;
 
         memset(&msg, 0, sizeof(msg));
 #ifdef HAVE_ACCRIGHTS_IN_MSGHDR
@@ -75,9 +79,13 @@ mm_send_fd(int sock, int fd)
         msg.msg_iov = &vec;
         msg.msg_iovlen = 1;
 
-        while ((n = sendmsg(sock, &msg, 0)) == -1 && (errno == EAGAIN ||
-            errno == EINTR))
+        pfd.fd = sock;
+        pfd.events = POLLOUT;
+        while ((n = sendmsg(sock, &msg, 0)) == -1 &&
+            (errno == EAGAIN || errno == EINTR)) {
                 debug3("%s: sendmsg(%d): %s", __func__, fd, strerror(errno));
+                (void)poll(&pfd, 1, -1);
+        }
         if (n == -1) {
                 error("%s: sendmsg(%d): %s", __func__, fd,
                     strerror(errno));
@@ -112,6 +120,7 @@ mm_receive_fd(int sock)
         ssize_t n;
         char ch;
         int fd;
+        struct pollfd pfd;
 
         memset(&msg, 0, sizeof(msg));
         vec.iov_base = &ch;
@@ -126,9 +135,13 @@ mm_receive_fd(int sock)
         msg.msg_controllen = sizeof(cmsgbuf.buf);
 #endif
 
-        while ((n = recvmsg(sock, &msg, 0)) == -1 && (errno == EAGAIN ||
-            errno == EINTR))
+        pfd.fd = sock;
+        pfd.events = POLLIN;
+        while ((n = recvmsg(sock, &msg, 0)) == -1 &&
+            (errno == EAGAIN || errno == EINTR)) {
                 debug3("%s: recvmsg: %s", __func__, strerror(errno));
+                (void)poll(&pfd, 1, -1);
+        }
         if (n == -1) {
                 error("%s: recvmsg: %s", __func__, strerror(errno));
                 return -1;