osf1 man page for clearenv

clearenv(3)						     Library Functions Manual						       clearenv(3)

NAME
       clearenv - Clears the process environment

LIBRARY
       Standard C Library (libc.a)

SYNOPSIS
       #include <stdlib.h>
       int clearenv ( void );

DESCRIPTION
       The  clearenv() function clears the process environment.  No environment variables are defined immediately after a call to clearenv().  The
       clearenv() function sets the value of the external variable environ to NULL.

NOTES
       Trial use

RETURN VALUES
       Upon successful completion, the clearenv() function returns 0 (zero).  Otherwise, it returns -1.

       If environ has been modified by anything other than the putenv() , getenv() , or clearenv() functions, then clearenv() will return an error
       and the process environment will remain unchanged.

RELATED INFORMATION
       Functions: exec(2), getenv(3), putenv(3) delim off

																       clearenv(3)