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<div id="version" align=right><b>petsc-3.14.5 2021-03-03</b></div>
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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>
<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> <A HREF="../Sys/PetscPOpen.html#PetscPOpen">PetscPOpen</A>(<A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A> comm,const char machine[],const char program[],const char mode[],FILE **fp)
</PRE>
Logically Collective, 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>comm </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 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>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>fp </B></TD><TD>- the file pointer where program input or output may be read or NULL if don't care
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
Use <A HREF="../Sys/PetscPClose.html#PetscPClose">PetscPClose</A>() to close the file pointer when you are finished with it
Does not work under Windows
<P>
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
<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>(), <A HREF="../Sys/PetscPClose.html#PetscPClose">PetscPClose</A>(), <A HREF="../Sys/PetscPOpenSetMachine.html#PetscPOpenSetMachine">PetscPOpenSetMachine</A>()
<BR>
<P>
<P><B></B><H3><FONT COLOR="#CC3333">Level</FONT></H3>intermediate<BR>
<H3><FONT COLOR="#CC3333">Location</FONT></H3>
</B><A HREF="../../../src/sys/fileio/mpiuopen.c.html#PetscPOpen">src/sys/fileio/mpiuopen.c</A>
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