zs_ctl_t
zs_ctl_t *g_zsctl;
zs_close(zs_ctl_t *ctl)
zs_usage_read_internal(zs_ctl_t *ctl, int init)
zs_usage_read(zs_ctl_t *ctl)
zs_ctl_t *
zs_ctl_t *ctl;
ctl = calloc(sizeof (zs_ctl_t), 1);
zs_ctl_t *zs_open();
void zs_close(zs_ctl_t *);
zs_usage_t *zs_usage_read(zs_ctl_t *);