explain_putenv_or_die - change or add an environment variable and report errors

       libexplain version 1.4
       Copyright (C) 2010 Peter Miller

                                                                                        explain_putenv_or_die(3)

       The  explain_putenv_or_die  function is used to call the putenv(3) system call. On failure an explanation
       will be printed to stderr, obtained from the explain_putenv(3) function, and then the process  terminates
       by calling exit(EXIT_FAILURE).

       The explain_putenv_on_error function is used to call the putenv(3) system call. On failure an explanation
       will be printed to stderr, obtained from the explain_putenv(3) function, but still returns to the caller.

       string  The string, exactly as to be passed to the putenv(3) system call.

       The explain_putenv_or_die function is intended to be used in a fashion similar to the following example:
              explain_putenv_or_die(string);

       explain_putenv_or_die - change or add an environment variable and report errors

       The  explain_putenv_or_die  function  only  returns  on  success,  see putenv(3) for more information. On
       failure, prints an explanation and exits, it does not return.

       The explain_putenv_on_error function always returns the value return  by  the  wrapped  putenv(3)  system
       call.

putenv(3)
               change or add an environment variable

       explain_putenv(3)
               explain putenv(3) errors

       exit(2) terminate the calling process

       #include <libexplain/putenv.h>
       void explain_putenv_or_die(char *string);
       int explain_putenv_on_error(char *string);