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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML3.2 EN">
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<TITLE>PetscVFPrintf</TITLE>
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<A NAME="PetscVFPrintf"><H1>PetscVFPrintf</H1></A>
All PETSc standard out and error messages are sent through this function; so, in theory, this can can be replaced with something that does not simply write to a file.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
PetscErrorCode PetscVFPrintfDefault(FILE *fd,const char *format,va_list Argp)
</PRE>
To use, write your own function for example,
.<A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> mypetscvfprintf(FILE *fd,const char format[],va_list Argp)
</pre>
.{ $ <A HREF="../Sys/PetscErrorCode.html#PetscErrorCode">PetscErrorCode</A> ierr;
</pre>
<pre>
</pre>
<pre>
<A HREF="../Sys/PetscFunctionBegin.html#PetscFunctionBegin">PetscFunctionBegin</A>;
</pre>
<pre>
if (fd != stdout && fd != stderr) { handle regular files
</pre>
<pre>
ierr = PetscVFPrintfDefault(fd,format,Argp); CHKERR(ierr);
</pre>
<pre>
} else {
</pre>
<pre>
char buff[BIG];
</pre>
<pre>
size_t length;
</pre>
<pre>
ierr = <A HREF="../Sys/PetscVSNPrintf.html#PetscVSNPrintf">PetscVSNPrintf</A>(buff,BIG,format,&length,Argp);<A HREF="../Sys/CHKERRQ.html#CHKERRQ">CHKERRQ</A>(ierr);
</pre>
<pre>
now send buff to whatever stream or whatever you want
</pre>
<pre>
}
</pre>
<pre>
<A HREF="../Sys/PetscFunctionReturn.html#PetscFunctionReturn">PetscFunctionReturn</A>(0);
</pre>
.} then before the call to <A HREF="../Sys/PetscInitialize.html#PetscInitialize">PetscInitialize</A>() do the assignment
</pre>
<pre>
<A HREF="../Sys/PetscVFPrintf.html#PetscVFPrintf">PetscVFPrintf</A> = mypetscvfprintf;
</pre>
<P>
Notes: For error messages this may be called by any process, for regular standard out it is
called only by process 0 of a given communicator
<P>
No error handling because may be called by error handler
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../Sys/PetscVSNPrintf.html#PetscVSNPrintf">PetscVSNPrintf</A>(), <A HREF="../Sys/PetscErrorPrintf.html#PetscErrorPrintf">PetscErrorPrintf</A>()
<BR>
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/fileio/mprint.c.html#PetscVFPrintf">src/sys/fileio/mprint.c</A>
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