1 This fixes an upstream bug:

     2 

     3     https://github.com/traviscross/mtr/issues/35

     4 

     5 The patch is from

     6 

     7     https://bugs.launchpad.net/mtr/+bug/1273486/comments/5

     8 

     9 --- mtr-0.86/net.c	2014-12-09 03:20:57.000000000 -0800

    10 +++ mtr-0.86/net.c	2015-03-20 09:43:55.576572132 -0700

    11 @@ -301,7 +301,7 @@ void net_send_tcp(int index)

    12  void net_send_tcp(int index)

    13  {

    14    int ttl, s;

    15 -  int opt = 1;

    16 +  int flags;

    17    int port;

    18    struct sockaddr_storage local;

    19    struct sockaddr_storage remote;

    20 @@ -354,10 +354,10 @@ void net_send_tcp(int index)

    21      exit(EXIT_FAILURE);

    22    }

    23  

    24 -  opt = 1;

    25 -  if (ioctl(s, FIONBIO, &opt)) {

    26 +  flags = fcntl(s, F_GETFL, 0);

    27 +  if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1) {

    28      display_clear();

    29 -    perror("ioctl FIONBIO");

    30 +    perror("fcntl F_SETFL(O_NONBLOCK)");

    31      exit(EXIT_FAILURE);

    32    }

    33