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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/Sys/PetscFOpen.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscFOpen"><H1>PetscFOpen</H1></A>
Has the first process in the communicator open a file; all others do nothing.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
PetscErrorCode PetscFOpen(MPI_Comm comm,const char name[],const char mode[],FILE **fp)
</PRE>
Logically Collective on <A HREF="../Sys/MPI_Comm.html#MPI_Comm">MPI_Comm</A>
<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>- the communicator
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>name </B></TD><TD>- the filename
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>mode </B></TD><TD>- the mode for fopen(), usually "w"
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameter</FONT></H3>
<DT><B>fp </B> -the file pointer
<br>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
NULL (0), "stderr" or "stdout" may be passed in as the filename
<P>
<H3><FONT COLOR="#CC3333">Fortran Note</FONT></H3>
This routine is not supported in Fortran.
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscFClose.html#PetscFClose">PetscFClose</A>(), <A HREF="../Sys/PetscSynchronizedFGets.html#PetscSynchronizedFGets">PetscSynchronizedFGets</A>(), <A HREF="../Sys/PetscSynchronizedPrintf.html#PetscSynchronizedPrintf">PetscSynchronizedPrintf</A>(), <A HREF="../Sys/PetscSynchronizedFlush.html#PetscSynchronizedFlush">PetscSynchronizedFlush</A>(),
<BR><A HREF="../Sys/PetscFPrintf.html#PetscFPrintf">PetscFPrintf</A>()
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/fileio/mpiuopen.c.html#PetscFOpen">src/sys/fileio/mpiuopen.c</A>
<BR><A HREF="./index.html">Index of all Sys 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/sys/classes/random/examples/tutorials/ex2.c.html">src/sys/classes/random/examples/tutorials/ex2.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex43.c.html">src/ksp/ksp/examples/tutorials/ex43.c.html</A><BR>
<A HREF="../../../src/ksp/ksp/examples/tutorials/ex49.c.html">src/ksp/ksp/examples/tutorials/ex49.c.html</A><BR>
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