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demo/cmd: bail out if fail to prepare command

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Check return value of prepare_cmd_lib() and exit if less than 0.

Also change prepare_cmd_lib() to write its error message to stderr
instead of stdout.
This commit is contained in:
Ian Abbott 2016-11-08 13:48:56 +00:00
parent 4329a08403
commit b7cb7f2331
1 changed files with 6 additions and 3 deletions
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9
demo/cmd.c
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@ -109,8 +109,11 @@ int main(int argc, char *argv[])
/* prepare_cmd_lib() uses a Comedilib routine to find a
* good command for the device. prepare_cmd() explicitly
* creates a command, which may not work for your device. */
prepare_cmd_lib(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
//prepare_cmd(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
ret = prepare_cmd_lib(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
//ret = prepare_cmd(dev, options.subdevice, options.n_scan, options.n_chan, 1e9 / options.freq, cmd);
if(ret < 0){
exit(1);
}
fprintf(stderr, "command before testing:\n");
dump_cmd(stderr, cmd);
@ -234,7 +237,7 @@ int prepare_cmd_lib(comedi_t *dev, int subdevice, int n_scan, int n_chan, unsign
* that's bad. */
ret = comedi_get_cmd_generic_timed(dev, subdevice, cmd, n_chan, scan_period_nanosec);
if(ret<0){
printf("comedi_get_cmd_generic_timed failed\n");
fprintf(stderr,"comedi_get_cmd_generic_timed failed\n");
return ret;
}