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Problem: cannot use pre-allocated FDs. Fixes #777

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Solution: add new [set|get]sockopt ZMQ_PRE_ALLOCATED_FD to allow
users to let ZMQ use a pre-allocated file descriptor instead of
allocating a new one. Update [set|get]sockopt documentation and
test accordingly.

The main use case for this feature is a socket-activated systemd
service. For more information about this feature see:
http://0pointer.de/blog/projects/socket-activation.html
This commit is contained in:
Luca Boccassi
2016-02-01 12:00:45 +00:00
parent d7a7f48918
commit 4bcbb3055e
6 changed files with 85 additions and 1 deletions
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17
src/options.cpp
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@@ -77,7 +77,8 @@ zmq::options_t::options_t () :
connected (false),
heartbeat_ttl (0),
heartbeat_interval (0),
heartbeat_timeout (-1)
heartbeat_timeout (-1),
pre_allocated_fd (-1)
{
#if defined ZMQ_HAVE_VMCI
vmci_buffer_size = 0;
@@ -621,6 +622,13 @@ int zmq::options_t::setsockopt (int option_, const void *optval_,
break;
# endif
case ZMQ_PRE_ALLOCATED_FD:
if (is_int && value >= -1) {
pre_allocated_fd = value;
return 0;
}
break;
default:
#if defined (ZMQ_ACT_MILITANT)
// There are valid scenarios for probing with unknown socket option
@@ -1031,6 +1039,13 @@ int zmq::options_t::getsockopt (int option_, void *optval_, size_t *optvallen_)
}
break;
case ZMQ_PRE_ALLOCATED_FD:
if (is_int) {
*value = pre_allocated_fd;
return 0;
}
break;
default:
#if defined (ZMQ_ACT_MILITANT)
malformed = false;