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<TITLE>PetscOptionsGetenv</TITLE>
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<A NAME="PetscOptionsGetenv"><H1>PetscOptionsGetenv</H1></A>
Gets an environmental variable, broadcasts to all processors in communicator from first.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
#include "petscsys.h"
int PetscOptionsGetenv(MPI_Comm comm,const char *name,char env[],int len,PetscTruth *flag)
</PRE>
Collective on MPI_Comm
<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>- communicator to share variable
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>name </B></TD><TD>- name of environmental variable
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>len </B></TD><TD>- amount of space allocated to hold variable
</TD></TR></TABLE>
<P>
<H3><FONT COLOR="#CC3333">Output Parameters</FONT></H3>
<TABLE border="0" cellpadding="0" cellspacing="0">
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>flag </B></TD><TD>- if not PETSC_NULL tells if variable found or not
</TD></TR>
<TR><TD WIDTH=40></TD><TD ALIGN=LEFT VALIGN=TOP><B>env </B></TD><TD>- value of variable
</TD></TR></TABLE>
<P>
<P>
<H3><FONT COLOR="#CC3333">Notes</FONT></H3>
You can also "set" the environmental variable by setting the options database value
-name "stringvalue" (with name in lower case). If name begins with PETSC_ this is
discarded before checking the database. For example, PETSC_VIEWER_SOCKET_PORT would
be given as -viewer_socket_port 9000
<P>
If <A HREF="../Sys/comm.html#comm">comm</A> does not contain the 0th process in the MPIRUN it is likely on
many systems that the environmental variable will not be set unless you
put it in a universal location like a .chsrc file
<P>
<P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>advanced
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/sys/src/utils/pdisplay.c.html#PetscOptionsGetenv">src/sys/src/utils/pdisplay.c</A>
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