R devel - Jun 2014 - setting environmental variable inside R function to call C function

wrapper <- function(){
  Sys.setenv(TMP="A")
  print(Sys.getenv("TMP"))

  .C("c_fun")
}


As the example above, I hope to set an env var $TMP inside the R function
"wrapper", which affects the functionality of the C function call
"c_fun".
Also the print line shows that $TMP is set to be "A", but the function
call
of "c_fun" was not affected.

Does anyone know why and how to correctly set the env var for subsequent
functions?

Thanks,
BW

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