[Dnsmasq-discuss] dnsmasq not terminating when running without syslog

Simon Kelley simon at thekelleys.org.uk
Mon Jul 12 20:55:36 BST 2010


On 12/07/10 09:19, Oliver Metz wrote:
> Hi. I'm running dnsmasq on an embedded mipsel system (uClibc-0.9.29). Sometimes syslog daemon is not activated for this system. When running dnsmasq without syslog it caches its syslog messages and tries to send them continuous with some pause. This prevents dnsmasq from exiting. Attached log shows an strace of dnsmaq when executing "killall dnsmasq". After some time I start syslogd and dnsmasq sends its messages and exits.
>
> _newselect(11, [3 5 6 7 8 9 10], [], [], NULL) = ? ERESTARTNOHAND (To be restarted)
> --- SIGTERM (Terminated) @ 0 (0) ---
> getpid()                                = 5453
> write(11, "\4\0\0\0\0\0\0\0", 8)        = 8
> sigreturn()                             = ? (mask now [ILL IOT CHLD STOP])
> time(NULL)                              = 1278920479
> stat64(0x425c98, 0x7fbf0a88)            = 0
> _newselect(11, [3 5 6 7 8 9 10], [], [], NULL) = 1 (in [10])
> time(NULL)                              = 1278920479
> read(10, "\4\0\0\0\0\0\0\0", 8)         = 8
> close(4)                                = 0
> unlink("/var/run/dnsmasq/dnsmasq.pid")  = 0
> getpid()                                = 5453
> time([1278920479])                      = 1278920479
> open("/etc/TZ", O_RDONLY)               = 4
> read(4, "CET-1CEST-2,M3.5.0/02:00:00,M10.5.0/03:00:00\n", 68) = 45
> close(4)                                = 0
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:57 dnsmasq[5453]: started, version 2.55 cachesize 150\0", 71) = -1 ENOTCONN (Transport endpoint is not connected)
> connect(12, {sa_family=AF_FILE, path="/dev/log"}, 110) = -1 ECONNREFUSED (Connection refused)
> nanosleep({0, 64000000}, NULL)          = 0
> ...(repeated many times)
> write(12, "<30>Jul 12 09:40:57 dnsmasq[5453]: started, version 2.55 cachesize 150\0", 71) = -1 ENOTCONN (Transport endpoint is not connected)
> connect(12, {sa_family=AF_FILE, path="/dev/log"}, 110) = -1 ECONNREFUSED (Connection refused)
> nanosleep({0, 1000000}, NULL)           = 0
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:57 dnsmasq[5453]: started, version 2.55 cachesize 150\0", 71) = -1 ENOTCONN (Transport endpoint is not connected)
> connect(12, {sa_family=AF_FILE, path="/dev/log"}, 110) = 0
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:57 dnsmasq[5453]: started, version 2.55 cachesize 150\0", 71) = 71
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:57 dnsmasq[5453]: compile time options: IPv6 GNU-getopt no-DBus no-I18N DHCP TFTP\0", 99) = 99
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:57 dnsmasq[5453]: asynchronous logging enabled, queue limit is 10 messages\0", 92) = 92
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:58 dnsmasq-dhcp[5453]: DHCP, IP range 192.168.178.20 -- 192.168.178.200, lease time 12h\0", 105) = 105
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:58 dnsmasq[5453]: reading /etc/resolv.conf\0", 60) = 60
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:58 dnsmasq[5453]: using nameserver 192.168.42.1#53\0", 68) = 68
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:58 dnsmasq[5453]: read /etc/hosts - 3 addresses\0", 65) = 65
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:40:58 dnsmasq-dhcp[5453]: read /etc/ethers - 1 addresses\0", 71) = 71
> getpid()                                = 5453
> write(12, "<30>Jul 12 09:41:19 dnsmasq[5453]: exiting on receipt of SIGTERM\0", 65) = 65
> close(12)                               = 0
> exit(0)
>
> Is there a switch to avoid this behavior? "--log-async" doesn't seem to prevent this.
>
> Thanks,
> Oliver
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Try

http://thekelleys.org.uk/dnsmasq/test-releases/dnsmasq-2.56test5.tar.gz

with --syslog-async.

Cheers,

Simon.



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