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<TITLE>PetscViewerBinaryGetDescriptor</TITLE>
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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/Viewer/PetscViewerBinaryGetDescriptor.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscViewerBinaryGetDescriptor"><H1>PetscViewerBinaryGetDescriptor</H1></A>
Extracts the file descriptor from a <A HREF="../Viewer/PetscViewer.html#PetscViewer">PetscViewer</A>.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscviewer.h"
PetscErrorCode PetscViewerBinaryGetDescriptor(PetscViewer viewer,int *fdes)
</PRE>
Collective On <A HREF="../Viewer/PetscViewer.html#PetscViewer">PetscViewer</A>
<P>
<H3><FONT COLOR="#CC3333">Input Parameter</FONT></H3>
<DT><B>viewer </B> -<A HREF="../Viewer/PetscViewer.html#PetscViewer">PetscViewer</A> context, obtained from <A HREF="../Viewer/PetscViewerBinaryOpen.html#PetscViewerBinaryOpen">PetscViewerBinaryOpen</A>()
<br>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>fdes </B> -file descriptor
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
For writable binary <A HREF="../Viewer/PetscViewers.html#PetscViewers">PetscViewers</A>, the descriptor will only be valid for the
first processor in the communicator that shares the <A HREF="../Viewer/PetscViewer.html#PetscViewer">PetscViewer</A>. For readable
files it will only be valid on nodes that have the file. If node 0 does not
have the file it generates an error even if another node does have the file.
<P>
<H3><FONT COLOR="#CC3333">Fortran Note</FONT></H3>
This routine is not supported in Fortran.
<P>
Developer Notes: This must be called on all processes because Dave May changed
the source code that this may be trigger a <A HREF="../Viewer/PetscViewerSetUp.html#PetscViewerSetUp">PetscViewerSetUp</A>() call if it was not previously triggered.
<P>
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Viewer/PetscViewerBinaryOpen.html#PetscViewerBinaryOpen">PetscViewerBinaryOpen</A>(),<A HREF="../Viewer/PetscViewerBinaryGetInfoPointer.html#PetscViewerBinaryGetInfoPointer">PetscViewerBinaryGetInfoPointer</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/classes/viewer/impls/binary/binv.c.html#PetscViewerBinaryGetDescriptor">src/sys/classes/viewer/impls/binary/binv.c</A>
<BR><A HREF="./index.html">Index of all Viewer routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/vec/vec/examples/tutorials/ex6.c.html">src/vec/vec/examples/tutorials/ex6.c.html</A><BR>
<A HREF="../../../src/mat/examples/tutorials/ex5.c.html">src/mat/examples/tutorials/ex5.c.html</A><BR>
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