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<A NAME="PetscPOpen"><H1>PetscPOpen</H1></A>
Runs a program on processor zero and sends either its input or output to a file.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
int PetscPOpen(MPI_Comm comm,char *machine,char *program,const char mode[],FILE **fp)
</PRE>
Collective on MPI_Comm, but only process 0 runs the command
<P>
<H3><FONT COLOR="#CC3333">Input Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B><A HREF="../Sys/comm.html#comm">comm</A> </B></TD><TD>- MPI communicator, only processor zero runs the program
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>machine </B></TD><TD>- machine to run command on or PETSC_NULL, or string with 0 in first location
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>program </B></TD><TD>- name of program to run
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mode </B></TD><TD>- either r or w
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>fp </B> -the file pointer where program input or output may be read or PETSC_NULL if don't care
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Does not work under Windows
<P>
The program string may contain ${DISPLAY}, ${HOMEDIRECTORY} or ${WORKINGDIRECTORY}; these
will be replaced with relevent values.
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscFOpen.html#PetscFOpen">PetscFOpen</A>(), <A HREF="../Sys/PetscFClose.html#PetscFClose">PetscFClose</A>(), PetscPClose()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>intermediate
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/src/fileio/mpiuopen.c.html#PetscPOpen">src/sys/src/fileio/mpiuopen.c</A>
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