[rrd-users] Re: C calls in rrdtool
oetiker at ee.ethz.ch
Mon Sep 9 23:19:57 MEST 2002
Today tome anticic wrote:
> I probably have a rather naive question concerning rrdtool. I know it
> is possible to have rrdtool commands as system commands or as perl
> But is it possible to have rrdtool commands from a C program?
> I am developing a C (actually C++) monitoring program, and each time an
> rrdtool call is made I use the system("rrdtool update ...") calls.
> These system calls seem to me a waste of CPU, as I have to make hundreds
> of them every few seconds. Is it possble to link
> rrdtool libraries to have in my C program something like
> rrdtool_update(...) or rrdtool_fetch?
> Also, could there be any locking problems with different processes reading
> at the same time from the same rrd file, while one process writes to it?
> Any help would be greatly appreciated!
Sure you can call it from C ... look at rrd_cgi ...
make sure to reset error variables and getopt externals between
calls .. use rrd_cgi.c as sample
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