petsc-3.11.4 2019-09-28

PetscPOpen

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

Synopsis

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

Input Parameters

	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

Output Parameter

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

Notes

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

If machine is not provided will use the value set with PetsPOpenSetMachine() if that was provided, otherwise will use the machine running node zero of the communicator

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

Level

intermediate

Location

src/sys/fileio/mpiuopen.c
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages