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: