[Darshan-users] Problem with darshan_log_getmounts and darshan_log_getexe

[Phil Carns]

On 04/13/2013 07:15 PM, Matthieu Dorier wrote:
> Hi,
>
> I'm using the C API of Darshan and I have some problems with the two 
> functions mentioned in the title of this mail.
> I'm testing them using 10024744407537054797.bz2 
> (in http://ftp.mcs.anl.gov/pub/darshan/data/intrepid/2012/9/1/).
> This trace is supposed to show 4 mount points, which I see when using 
> the darshan-parse command line tool, yet darshan_log_getmounts gives 
> me 0 mount points.
> The "exe" field is supposed to contain "3979759305", but when 
> calling darshan_log_getexe I get the string "2.02".
> These functions do not return any error code.
>
> All other functions are working properly. I'm using version 2.2.5 of 
> Darshan.
>
> Just to check, here is how I use these functions:
>
> int64_t** devs;
> char*** mnt_pts;
> char*** fs_types;
> int count;
> int err = darshan_log_getmounts(fd,devs,mnt_pts,fs_types,&count);
> // here c = 0
> free(devs); free(mnt_pts); free(fs_types);
>
> char buffer[CP_EXE_LEN+2];
> darshan_log_getexe(fd, buffer);
>
> Is there a bug somewhere or am I misusing these functions?
> Thanks!

Hi Matthieu,

You'll need to make a slight change to the arguments to getmounts to 
pass in references to the pointers to be filled in, I think:

int64_t* devs;
char** mnt_pts;
char** fs_types;
int count;
int err = darshan_log_getmounts(fd,&devs,&mnt_pts,&fs_types,&count);

If that doesn't work, its also possible that the calls to getexe() and 
getmounts() may need to be in the opposite order, but I'll need to 
double-check on Monday.   From glancing at the code it looks like either 
way should be fine.

One other minor detail is that technically when free'ing mnt_pts and 
fs_types you need to loop from i=0 to i=count-1 and free mnt_pts[i] and 
fs_types[i] as well, though.

As you can see this API has not been used much beyond our own internal 
tools so far, so isn't as polished as it probably should be :)

thanks,
-Phil

>
> Matthieu Dorier
> PhD student at ENS Cachan Brittany and IRISA
> http://people.irisa.fr/Matthieu.Dorier
>
>
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