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doing a retry for the preload write is useless, since the command

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hasn't started yet.  Print a useful error message and exit instead.
This commit is contained in:
Frank Mori Hess 2004-01-02 01:16:00 +00:00
parent 054cade97f
commit 998c091e1e
1 changed files with 11 additions and 9 deletions
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20
demo/ao_waveform.c
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@ -178,16 +178,18 @@ int main(int argc, char *argv[])
}
dds_output(data,BUF_LEN);
n=BUF_LEN*sizeof(sampl_t);
while(n>0){
m=write(comedi_fileno(dev),(void *)data+(BUF_LEN*sizeof(sampl_t)-n),n);
if(m<0){
perror("write");
exit(0);
}
printf("m=%d\n",m);
n-=m;
n = BUF_LEN * sizeof(sampl_t);
m = write(comedi_fileno(dev), (void *)data, n);
if(m < 0){
perror("write");
exit(1);
}else if(m < n)
{
fprintf(stderr, "failed to preload output buffer with %i bytes, is it too small?\n"
"See the --write-buffer option of comedi_config\n", n);
exit(1);
}
printf("m=%d\n",m);
ret = comedi_internal_trigger(dev, subdevice, 0);
if(ret<0){