void explain_setenv_or_die(const char *name, const char *value, int
overwrite);
int explain_setenv_on_error(const char *name, const char *value, int
overwrite);
DESCRIPTION
The explain_setenv_or_die function is used to call the
setenv(3) system call. On failure an explanation will be printed to
stderr, obtained from the explain_setenv(3) function, and
then the process terminates by calling exit(EXIT_FAILURE).
The explain_setenv_on_error function is used to call the
setenv(3) system call. On failure an explanation will be printed to
stderr, obtained from the explain_setenv(3) function, but
still returns to the caller.
name
The name, exactly as to be passed to the setenv(3) system call.
value
The value, exactly as to be passed to the setenv(3) system call.
overwrite
The overwrite, exactly as to be passed to the setenv(3) system
call.
RETURN VALUE
The explain_setenv_or_die function only returns on success, see
setenv(3) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_setenv_on_error function always returns the value
return by the wrapped setenv(3) system call.
EXAMPLE
The explain_setenv_or_die function is intended to be used in a
fashion similar to the following example: