libgcrypt/libgcrypt-1.7.6-use-poll.patch

diff -up libgcrypt-1.7.6/random/rndlinux.c.use-poll libgcrypt-1.7.6/random/rndlinux.c
--- libgcrypt-1.7.6/random/rndlinux.c.use-poll	2017-01-30 14:20:13.665662981 +0100
+++ libgcrypt-1.7.6/random/rndlinux.c	2017-01-30 14:27:45.957027214 +0100
@@ -32,6 +32,7 @@
 #include <string.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <poll.h>
 #if defined(__linux__) && defined(HAVE_SYSCALL)
 # include <sys/syscall.h>
 #endif
@@ -211,9 +212,8 @@ _gcry_rndlinux_gather_random (void (*add
                  return with something we will actually use 100ms. */
   while (length)
     {
-      fd_set rfds;
-      struct timeval tv;
       int rc;
+      struct pollfd pfd;
 
       /* If we have a modern Linux kernel and we want to read from the
        * the non-blocking /dev/urandom, we first try to use the new
@@ -269,33 +269,22 @@ _gcry_rndlinux_gather_random (void (*add
           any_need_entropy = 1;
         }
 
-      /* If the system has no limit on the number of file descriptors
-         and we encounter an fd which is larger than the fd_set size,
-         we don't use the select at all.  The select code is only used
-         to emit progress messages.  A better solution would be to
-         fall back to poll() if available.  */
-#ifdef FD_SETSIZE
-      if (fd < FD_SETSIZE)
-#endif
+      pfd.fd = fd;
+      pfd.events = POLLIN;
+
+      if ( !(rc=poll(&pfd, 1, delay)) )
         {
-          FD_ZERO(&rfds);
-          FD_SET(fd, &rfds);
-          tv.tv_sec = delay;
-          tv.tv_usec = delay? 0 : 100000;
-          if ( !(rc=select(fd+1, &rfds, NULL, NULL, &tv)) )
-            {
-              any_need_entropy = 1;
-              delay = 3; /* Use 3 seconds henceforth.  */
-              continue;
-            }
-          else if( rc == -1 )
-            {
-              log_error ("select() error: %s\n", strerror(errno));
-              if (!delay)
-                delay = 1; /* Use 1 second if we encounter an error before
-                              we have ever blocked.  */
-              continue;
-            }
+          any_need_entropy = 1;
+          delay = 3000; /* Use 3 seconds henceforth.  */
+          continue;
+        }
+        else if( rc == -1 )
+        {
+          log_error ("poll() error: %s\n", strerror(errno));
+          if (!delay)
+            delay = 1000; /* Use 1 second if we encounter an error before
+                          we have ever blocked.  */
+          continue;
         }
 
       /* Read from the device.  */