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| -rw-r--r-- | man/man7/zmq_pgm.7 | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/man/man7/zmq_pgm.7 b/man/man7/zmq_pgm.7 index fb37735..6d70a56 100644 --- a/man/man7/zmq_pgm.7 +++ b/man/man7/zmq_pgm.7 @@ -18,6 +18,14 @@ socket option. PGM transport can be used only with ZMQ_PUB and ZMQ_SUB sockets. +Caution: PGM protocol runs directly on top of IP protocol and thus needs to +open raw IP socket. On some operating systems this operation requires special +privileges. On Linux, for example, you would need to either run your application +as root or set adequate capabilities for your executable. Alternative approach +is to use UDP transport, +.IR zmq_udp(7) , +that stacks PGM on top of UDP and thus needs no special privileges. + .SH CONNECTION STRING Connection string for PGM transport is "pgm://" followed by an IP address |