[Kde-games-devel] setDiscoveryInfo ?

[Jakub Stachowski]

Dnia piątek, 19 sierpnia 2005 15:15, Kleag napisał:
> It's more like that:

[ ... ]

> stat64("/home/gael/kde3.4.1/share/config/kdnssdrc", 0xbfffdb10) = -1 ENOENT
> (No such file or directory)
> socket(PF_FILE, SOCK_STREAM, 0)         = 12
> connect(12, {sa_family=AF_FILE, path="/var/run/mdnsd"}, 110) = -1 ENOENT
> (No such file or directory)
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigaction(SIGCHLD, NULL, {0xb7683ee0, [], SA_RESTART|SA_NOCLDSTOP}, 8) =
> 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> nanosleep({1, 0}, {1, 0})               = 0
> connect(12, {sa_family=AF_FILE, path="/var/run/mdnsd"}, 110) = -1 ENOENT
> (No such file or directory)
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigaction(SIGCHLD, NULL, {0xb7683ee0, [], SA_RESTART|SA_NOCLDSTOP}, 8) =
> 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> nanosleep({1, 0}, {1, 0})               = 0
> connect(12, {sa_family=AF_FILE, path="/var/run/mdnsd"}, 110) = -1 ENOENT
> (No such file or directory)
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigaction(SIGCHLD, NULL, {0xb7683ee0, [], SA_RESTART|SA_NOCLDSTOP}, 8) =
> 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> nanosleep({1, 0}, {1, 0})               = 0
> connect(12, {sa_family=AF_FILE, path="/var/run/mdnsd"}, 110) = -1 ENOENT
> (No such file or directory)
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigaction(SIGCHLD, NULL, {0xb7683ee0, [], SA_RESTART|SA_NOCLDSTOP}, 8) =
> 0 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> nanosleep({1, 0}, {1, 0})               = 0

Yeah, it is libdns_sd doing idiotic thing - trying to connect to mdnsd over 
and over despite it is not running. I commited a fix to 3.5 branch (i will 
backport it to 3.4 too) that first checks if mdnsd is really running before 
trying to make any publishing.
As a workaround for users with kdelibs 3.4.0-3.4.2 you can use following code 
(from kdelibs/dnssd/servicebrowser.cpp) as a workaround:

bool dnssdAvailable() {
        QFile f("/var/run/mdnsd.pid");
        if (!f.open(IO_ReadOnly)) return false; // no pidfile
        QString line;
        if (f.readLine(line,16)<1) return false;
        unsigned int pid = line.toUInt();
        if (pid==0) return Stopped;           // not a pid
        return (kill(pid,0)==0 || errno==EPERM);
        // signal 0 only checks if process is running, mdnsd is probably 
owned // by 'nobody' so we will  get EPERM, if mdnsd is not running error 
will be ESRCH
}

if (dnssdAvailable) setDiscoveryInfo("_ksirk._tcp");