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| From: | Marc Rosen |
| Subject: | Re: GPS Mac OS challenges |
| Date: | Thu, 9 Dec 2021 17:54:19 -0600 |
14” MBP M1 Pro running Mac OS v12.0 the version of brew is: Homebrew/homebrew-core (git revision 4568016b7c0; last commit 2021-12-05) versions of gpsd & ntp: Marcs-2020-MacBook-Pro-2:Cellar marc$ ls gpsd/ 3.23.1 Marcs-2020-MacBook-Pro-2:Cellar marc$ ls ntp 4.2.8p15 Marcs-2020-MacBook-Pro-2:Cellar marc$ When the system restarts: kern.sysv.shmall: 25600 kern.sysv.shmmax: 52428800 kern.sysv.shmmin: 1 kern.sysv.shmmni: 32 kern.sysv.shmseg: 8 gpsd:ERROR: shmat failed: Too many open files afterwards there are 8 shared memory segments present when I run this command and retry gpsd ( after removing existing segments) that error goes away sudo sysctl -w kern.sysv.shmseg=32 kern.sysv.shmseg: 8 -> 32 there are now 9 shared memory segments present ( running gpsd as root) When I restart the laptop - the shmem change reverts when I run gpsd as root - I get a warning to run it as user from user space/login when I run it as user - it opens 7 shared memory segments, then running ntpd as root opens 2 more either way I get a permission denied error running ntpshmmon ( either as user or root) there was one time when I did not see this error - not sure what was different Marcs-2020-MacBook-Pro-2:ntp marc$ ntpshmmon WARNING: could not open SHM(0): Permission denied(13) WARNING: could not open SHM(1): Permission denied(13) ntpshmmon: version 3.23.1 # Name Seen@ Clock Real L Prc * Running ntpshmmon as root gives this error: Marcs-2020-MacBook-Pro-2:bin marc$ sudo ntpshmmon Password: WARNING: could not open SHM(0): Permission denied(13) WARNING: could not open SHM(1): Permission denied(13) ntpshmmon: version 3.23.1 # Name Seen@ Clock Real L Prc marc$ ntpshmmon -V ntpshmmon: version 3.23.1 (revision 3.23.1) ntpd - NTP daemon program - Ver. 4.2.8p15 *************************** gpsdebuginfo (gpsd as user, ntpd as root, started from rebooted Mac with shared mem segs increased to 32 ++ id -u + '[' 0 '!=' 0 ']' + id uid=0(root) gid=0(wheel) groups=0(wheel),1(daemon),2(kmem),3(sys),4(tty),5(operator),8(procview),9(procmod),12(everyone),20(staff),29(certusers),61(localaccounts),80(admin),33(_appstore),98(_lpadmin),100(_lpoperator),204(_developer),250(_analyticsusers),395(com.apple.access_ftp),398(com.apple.access_screensharing),399(com.apple.access_ssh),400(com.apple.access_remote_ae) + uname -a Darwin Marcs-2020-MacBook-Pro-2.local 21.0.1 Darwin Kernel Version 21.0.1: Tue Sep 14 20:56:24 PDT 2021; root:xnu-8019.30.61~4/RELEASE_ARM64_T6000 arm64 + cat '/etc/*release' cat: /etc/*release: No such file or directory + command -v gpsd /opt/homebrew/sbin/gpsd + gpsd -V gpsd: 3.23.1 (revision 3.23.1) + gpsd -h + grep '^#.*enabled' # Control socket for hotplug notifications enabled. # Netfeed enabled. # NTRIP enabled. # Shared memory export enabled. # Socket export enabled. + command -v sockstat + command -v lsof /usr/sbin/lsof + lsof -iTCP:2947 -s TCP:LISTEN COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME gpsd 958 marc 4u IPv4 0x6a723775c2bd8313 0t0 TCP localhost:gpsd (LISTEN) gpsd 958 marc 5u IPv6 0x6a723775b9f54bdb 0t0 TCP localhost:gpsd (LISTEN) + lsof -c gpsd + sed -nE '1p;/CHR|LISTEN/p' COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME gpsd 958 marc 0u CHR 16,0 0t207248 1217 /dev/ttys000 gpsd 958 marc 1u CHR 16,0 0t207248 1217 /dev/ttys000 gpsd 958 marc 2u CHR 16,0 0t207248 1217 /dev/ttys000 gpsd 958 marc 4u IPv4 0x6a723775c2bd8313 0t0 TCP localhost:gpsd (LISTEN) gpsd 958 marc 5u IPv6 0x6a723775b9f54bdb 0t0 TCP localhost:gpsd (LISTEN) gpsd 958 marc 6u CHR 9,1 0t30673 1199 /dev/cu.usbmodem1203 + ps ax + sed -nE '1p;/gpsd/p' PID TT STAT TIME COMMAND 958 s000 S+ 0:00.13 gpsd -n /dev/cu.usbmodem1203 -ND4 -F /opt/homebrew/var/gpsd.sock 1039 s002 S+ 0:00.01 sudo ./gpsdebuginfo 1040 s002 S+ 0:00.00 /bin/sh ./gpsdebuginfo 1054 s002 S+ 0:00.00 sed -nE 1p;/gpsd/p + command -v gpspipe /opt/homebrew/bin/gpspipe + gpspipe -V gpspipe: 3.23.1 (revision 3.23.1) + gpspipe -w -n 2 -x 20 {"class":"VERSION","release":"3.23.1","rev":"3.23.1","proto_major":3,"proto_minor":14} {"class":"DEVICES","devices":[{"class":"DEVICE","path":"/dev/cu.usbmodem1203","driver":"NMEA0183","activated":"2021-12-09T23:50:01.947Z","flags":1,"native":0,"bps":57600,"parity":"N","stopbits":2,"cycle":1.00}]} + command -v ipcs /usr/bin/ipcs + ipcs -m + sed -nE '/key/p;/KEY/p;/0x4e5450/p' T ID KEY MODE OWNER GROUP m 65536 0x4e545032 --rw-rw-rw- marc staff m 65537 0x4e545033 --rw-rw-rw- marc staff m 65538 0x4e545034 --rw-rw-rw- marc staff m 65539 0x4e545035 --rw-rw-rw- marc staff m 65540 0x4e545036 --rw-rw-rw- marc staff m 65541 0x4e545037 --rw-rw-rw- marc staff m 65543 0x4e545030 --rw------- root wheel m 65544 0x4e545031 --rw------- root wheel + command -v ntpshmmon /opt/homebrew/bin/ntpshmmon + ntpshmmon -V ntpshmmon: version 3.23.1 (revision 3.23.1) + ntpshmmon -n 6 -t 10 WARNING: could not open SHM(0): Permission denied(13) WARNING: could not open SHM(1): Permission denied(13) ntpshmmon: version 3.23.1 # Name Seen@ Clock Real L Prc **************************************** On Dec 6, 2021, at 1:54 PM, Gary E. Miller <gem@rellim.com> wrote: Yo Marc! On Mon, 6 Dec 2021 10:42:05 -0600 Marc Rosen <marc.rosen@mac.com> wrote: I'm most of the way done connecting my GPS to my MBP OS X Monterrey , Should be nothing ahrd about that. In the end I'm using homebrew (package) versions of ntp and gpsd. What versions? The That's a new one. I assume it sends standard NMEA? The main difficulties were setting I'm not sure that is hard. Just put the device path on the gpsd command line. increasing I'm not sure why you would need that. and dealing with Mac env restrictions I'm not sure why you would need that. I still can't get ntpshmemmon to run properly- permission denied to I've never had that problem on a mac. Maybe some new Apple specific hardening. Any solutions? Can it work? Yes. Do I understand your problem? No. cgps shows great data Good. ntpq -p shows the GPS data updating ( no PPS) You are skipping a lot of dettails. Please rung gpsdebuginfo and send the output here. In general, if ntpshmmon is not working, you can stop right that and not look at anything else NTP. One question is how to test it properly Run gpsdebuginfo, and send the result herre. Also try the Toubleshooting Guide: https://gpsd.io/troubleshooting.html I want the Mac system clock to rely on the gps No, you want it to rely on ntpd, which may rely on GPS for part if its data. I tried setting the date time system prefs to use 127.0.0.1 , No, you want ntpd to control your system time, not macOS. the If that is what you are doing, that is wrong. Any suggestions for testing? See above. Does anyone know if PPS is supported by the Radio? Probably not, but the output of "-ND 4" that I already asked for would tell you. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 gem@rellim.com Tel:+1 541 382 8588 Veritas liberabit vos. -- Quid est veritas? "If you can't measure it, you can't improve it." - Lord Kelvin |
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