putenv(3C)                                                putenv(3C)


       NAME
             putenv - change or add value to environment

       SYNOPSIS
             #include <stdlib.h>
             int putenv (char *string);

       DESCRIPTION
             string points to a string of the form ``name=value.''  putenv
             makes the value of the environment variable name equal to
             value by altering an existing variable or creating a new one.
             In either case, the string pointed to by string becomes part
             of the environment, so altering the string will change the
             environment.  string should not be a local (stack allocated)
             variable, since returning from the current function and
             calling a new one will change the environment.  If name is
             later redefined by another putenv, string is no longer used.
             It may be altered or reused without affecting the environment.

          Return Values
             putenv returns non-zero if it was unable to obtain enough
             space via malloc for an expanded environment, otherwise zero.

       REFERENCES
             environ(5), exec(2), getenv(3C), malloc(3C)

       NOTICES
             putenv manipulates the environment pointed to by environ, and
             can be used in conjunction with getenv.  However, envp (the
             third argument to main) is not changed.
             This routine uses malloc(3C) to enlarge the environment.
             After putenv is called, environmental variables are not in
             alphabetical order.

             A potential error is to call the function putenv with a
             pointer to an automatic variable as the argument and to then
             exit the calling function while string is still part of the
             environment.










                           Copyright 1994 Novell, Inc.               Page 1