Re: [ntp:questions] nmea patch

2008-12-20 Thread Per Hedeland 
In article 6zydnasrfpna1dbunz2dnuvz_qrin...@megapath.net
hal-use...@ip-64-139-1-69.sjc.megapath.net (Hal Murray) writes:
In article ywn94p108yb7@ntp1.isc.org,
 Harlan Stenn st...@ntp.org writes:
I'm glad it is working for you and I'd be even happier if we could figure
out why the NULL string got where it did earlier, as ntpd should never drop
core like that.

It might be just a simple bug.  The code in that area says:

  if ((len = readlink(device,buffer,sizeof(buffer))) == -1)
return(0);
  buffer[len] = 0;

  if ((nmea_host = strtok(buffer,:)) == NULL)
return(0);

  nmea_port = atoi(strtok(NULL,:));

The idea is that if you are using the nmead, then /dev/gps0
will be a synbilic link to someting like server:port so
nmea_host will be the server and nmea_port will be the port number.

And if it isn't, but rather a link to (say) /dev/ttyS0, nmea_host will
get the whole /dev/ttyS0 (the first colon-separated token), the
second strtok() will return NULL since there are no more tokens, and
atoi(NULL) shouldn't be expected to do anything more meaningful than
crash. Better code would be

  char *p;
  ...
  if ((p = strtok(NULL,:)) == NULL)
 return 0;
  nmea_port = atoi(p);

--Per Hedeland
p...@hedeland.org

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[ntp:questions] 28 tjxzs.com.cn 52

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