NAME

       explain_unsetenv_or_die - remove an environment variable and report errors

SYNOPSIS

       #include <libexplain/unsetenv.h>
       void explain_unsetenv_or_die(const char *name);
       int explain_unsetenv_on_error(const char *name);

DESCRIPTION

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

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

       name    The name, exactly as to be passed to the unsetenv(3) system call.

RETURN VALUE

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

       The explain_unsetenv_on_error function always returns the  value  return  by  the  wrapped
       unsetenv(3) system call.

EXAMPLE

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

SEE ALSO

       unsetenv(3)
               change or add an environment variable

       explain_unsetenv(3)
               explain unsetenv(3) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2010 Peter Miller

                                                                       explain_unsetenv_or_die(3)