log_open
if (log_open) {
log_open = 1;
log_open = 0;
if (!log_open)
int log_open; /* also used in log() */
extern int log_open;
(void)_vprintf(level, log_open ? TOLOG : TOCONS | TOLOG, fmt, ap);
void log_open (char const *prog, int32_t log2stderr);
log_open(SDPD, !detach);