Adam, The code is calling ctl_getenqueuespace() but the returned "space" value is not used. Are you sure the size of the "data" mbuf is less than the value of "space"? Vincent On Jan 14, 2014, at 5:56 AM, Adam Schepis <adam.schepis@gmail.com> wrote:
I’m writing a socket filter and when communicating with my daemon i’m now receiving ENOBUFS whenever i call ctl_enqueuembuf
i ran netstat -mm and get:
class buf active ctotal total cache cached uncached memory name size bufs bufs bufs state bufs bufs usage ---------- ----- -------- -------- -------- ----- -------- -------- --------- mbuf 256 1206 340 1376 on 46 124 85.0 KB cl 2048 1034 28 1062 on 2 26 56.0 KB bigcl 4096 2 310 312 on 0 310 1.2 MB 16kcl 16384 1 7 8 on 0 7 112.0 KB mbuf_cl 2304 1025 1034 1034 on 9 0 2.3 MB mbuf_bigcl 4352 0 2 2 on 2 0 8.5 KB mbuf_16kcl 16640 0 1 1 on 1 0 16.2 KB
1194/1206 mbufs in use: 1060 mbufs allocated to data 113 mbufs allocated to ancillary data 21 mbufs allocated to socket names and addresses 12 mbufs allocated to caches 1025/1062 mbuf 2KB clusters in use 0/312 mbuf 4KB clusters in use 0/8 mbuf 16KB clusters in use 3844 KB allocated to network (61.1% in use) 0 requests for memory denied 0 requests for memory delayed 0 calls to drain routines
This output changes very little and persists even after reboot.
ctl_getenqueuespace reliably returns 8196 bytes
The dev machine i’m running is Mavericks running in VMWare Fusion (so i can debug kernel panics)
here is a paste of the code in question:
kern_return_t control_socket_enqueue(mbuf_t data) { LOGDEBUG("%s\n", __PRETTY_FUNCTION__); kern_return_t res = KERN_SUCCESS; size_t space = 0;
if (accountability_ctl_active_conn == NULL) { LOGDEBUG("NO CONTROL SOCKET ATTACHED\n"); res = KERN_INVALID_ARGUMENT; } else { LOGDEBUG("ENQUEING MBUF. %llu(unit_id: %d)\n", (u_int64_t)accountability_ctl_active_conn, accountability_ctl_active_conn->sc_unit);
res = ctl_getenqueuespace(accountability_ctlref, accountability_ctl_active_conn->sc_unit, &space); if (res) { LOGDEBUG("failed to get space remaining in queue. err=%d\n", res); } else { LOGDEBUG("free in queue: %d\n", (int)space); }
mbuf_t send_buf; res = mbuf_dup(data, MBUF_WAITOK, &send_buf); if (res) { LOGDEBUG("failed to copy mbuf. err=%d\n", res); } else { res = ctl_enqueuembuf(accountability_ctlref, accountability_ctl_active_conn->sc_unit, send_buf, CTL_DATA_EOR); if (res) { LOGDEBUG("failed to enqueue data to control socket. err=%d\n", res); mbuf_freem(send_buf); } else { LOGDEBUG("successfully enqueued data to control socket.\n"); } } } return res; }
pretty confused at this point as i’m not sure why exactly ENOBUFS is being returned. The only thing i’m certain of is that it is my fault! Any help for tutelage would be much appreciated.
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