petsc-3.4.5 2014-06-29

PetscPOpen

Runs a program on processor zero and sends either its input or output to a file.

PetscErrorCode  PetscPOpen(MPI_Comm comm,const char machine[],const char program[],const char mode[],FILE **fp)

Logically Collective on MPI_Comm, but only process 0 runs the command

	comm	- MPI communicator, only processor zero runs the program
	machine	- machine to run command on or NULL, or string with 0 in first location
	program	- name of program to run
	mode	- either r or w

fp -the file pointer where program input or output may be read or NULL if don't care

Use PetscPClose() to close the file pointer when you are finished with it Does not work under Windows

The program string may contain ${DISPLAY}, ${HOMEDIRECTORY} or ${WORKINGDIRECTORY}; these will be replaced with relevent values.