[petsc-users] Problem with options and PetscFOpen/fopen

[Oleksandr Koshkarov]

Hello all,

I am trying to read options using petsc capabilities and it is working fine.

However, if I open file to read with fopen/PetscFOpen some of options 
stopped being read.

I think It may be a bug or I am doing something very stupid and cannot 
see it.

Here is the snippets of what I do:

PetscBool flag;
int path_str_size = 100;
char str[path_str_size];
PetscOptionsGetString(NULL,NULL,"--config",str,path_str_size,&flag);
if (flag)
   PetscOptionsInsert(NULL,argc,args,str);
else
   try_again("Please specify input file: \"--config config_path\"\n");

// Loading options:
PetscOptionsGetReal(NULL,NULL,"--dt",&(env->dt),&flag);
if (!flag) try_again("Please specify dt: \"--dt value\"\n");

....

PetscOptionsGetInt(NULL,NULL,"--Ns",&(env->Ns),&flag);
if (!flag) try_again("Please specify Ns: \"--Ns value\"\n");

for (int s; s<env->Ns; s++) {

   sprintf(str,"--mass%d",s);
PetscOptionsGetReal(NULL,NULL,str,&(env->species[s].mass),&flag);
   if (!flag) try_again("Please specify all masses: \"--mass<N> value\" 
(N starts from 0)\n");

   ...
}


PetscOptionsGetString(NULL,NULL,"--grid",str,path_str_size,&flag);
if (!flag) try_again("Please specify grid file \"--grid path\"\n");


// This code alone works fine without a trouble!
// but if I add next three lines, options which are in the loop stopped 
being read (i.e., --mass0, --mass1, etc) (I am even getting a warning 
from petsc that they are not being used
// while other options (i.e., --dt, --Ns) are alright
FILE *fp;
PetscFOpen(PETSC_COMM_SELF,str,"r",&fp); // if I use fopen or different 
variable (not str) - the same effect.
PetscFClose(PETSC_COMM_SELF,fp);

It seems it is possible to avoid this problem if you wrap 3 last lines 
in the separate function.

p.s. Am I doing something stupid?

Best regards,
Alex.