PetscVFPrintfDefault#

All PETSc standard out and error messages are sent through this function; so, in theory, this can can be replaced with something that does not simply write to a file.

Synopsis#

PetscErrorCode PetscVFPrintfDefault(FILE *fd, const char *format, va_list Argp)

Input Parameters#

fd - the file descriptor to write to
format - the format string to write with
Argp - the variable argument list of items to format and write

Note#

For error messages this may be called by any MPI process, for regular standard out it is called only by MPI rank 0 of a given communicator

Example Usage#

To use, write your own function for example,

   PetscErrorCode mypetscvfprintf(FILE *fd, const char format[], va_list Argp)
   {
     PetscErrorCode ierr;

     PetscFunctionBegin;
      if (fd != stdout && fd != stderr) {  handle regular files
         CHKERR(PetscVFPrintfDefault(fd,format,Argp));
     } else {
        char   buff[BIG];
        size_t length;
        PetscCall(PetscVSNPrintf(buff,BIG,format,&length,Argp));
        now send buff to whatever stream or whatever you want
    }
    PetscFunctionReturn(PETSC_SUCCESS);
   }

then before the call to PetscInitialize() do the assignment PetscVFPrintf = mypetscvfprintf;

Developer Notes#

This could be called by an error handler, if that happens then a recursion of the error handler may occur and a resulting crash

Level#

developer

Location#

src/sys/fileio/mprint.c

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