int
main(int argc, char **argv)
{
int retval;
boolean_t tty;
/* Parse arguments. */
top_p_opts_parse(argc, argv);
tty = isatty(0);
/*
* Make sure the user doesn't mind logging mode, if not running on a
* tty.
*/
if (tty == FALSE && top_opt_L) {
fprintf(stderr, "top: Not running on a tty\n");
exit(1);
}
/* Determine whether to run interactively or in logging mode. */
if (tty && top_opt_l == FALSE) {
/* Run interactively. */
if (disp_run()) {
retval = 1;
goto RETURN;
}
} else {
/* Run in logging mode. */
if (log_run()) {
retval = 1;
goto RETURN;
}
}
retval = 0;
RETURN:
return retval;
}
int main(int argc, char** argv) {
int wstat, ret;
pid_t pid;
struct timeval tv;
service_t *svc;
// initialize wake structure, which is owned by main
memset(wake, 0, sizeof(*wake));
// just in case, but probably redundant
FD_ZERO(&wake->fd_read);
FD_ZERO(&wake->fd_write);
FD_ZERO(&wake->fd_err);
FD_ZERO(&wake->fd_ready_read);
FD_ZERO(&wake->fd_ready_write);
FD_ZERO(&wake->fd_ready_err);
// wake structure holds current time so we don't keep calling clock_gettime()
wake->now= gettime_mon_frac();
log_init();
svc_init();
fd_init();
ctl_init();
// Special defaults when running as init
if (getpid() == 1) {
opt_config_file= CONFIG_FILE_DEFAULT_PATH;
opt_terminate_guard= 1;
}
umask(077);
// parse arguments, overriding default values
parse_opts(argv+1);
// Check for required options
if (!opt_interactive && !opt_config_file && !opt_socket_path)
fatal(EXIT_BAD_OPTIONS, "require -i or -c or -S");
// Initialize file descriptor object pool
if (opt_fd_pool_count > 0 && opt_fd_pool_size_each > 0)
if (!fd_preallocate(opt_fd_pool_count, opt_fd_pool_size_each))
fatal(EXIT_INVALID_ENVIRONMENT, "Unable to preallocate file descriptor objects");
if (!fd_init_special_handles())
fatal(EXIT_BROKEN_PROGRAM_STATE, "Can't initialize all special handles");
if (!register_open_fds())
fatal(EXIT_BAD_OPTIONS, "Not enough FD objects to register all open FDs");
// Set up signal handlers and signal mask and signal self-pipe
// Do this AFTER registering all open FDs, because it creates a pipe
sig_init();
// Initialize service object pool
if (opt_svc_pool_count > 0 && opt_svc_pool_size_each > 0)
if (!svc_preallocate(opt_svc_pool_count, opt_svc_pool_size_each))
fatal(EXIT_INVALID_ENVIRONMENT, "Unable to preallocate service objects");
// Initialize controller object pool
control_socket_init();
if (opt_socket_path && !control_socket_start(STRSEG(opt_socket_path)))
fatal(EXIT_INVALID_ENVIRONMENT, "Can't create controller socket");
if (opt_interactive)
if (!setup_interactive_mode())
fatal(EXIT_INVALID_ENVIRONMENT, "stdin/stdout are not usable!");
if (opt_config_file)
if (!setup_config_file(opt_config_file))
fatal(EXIT_INVALID_ENVIRONMENT, "Unable to process config file");
if (opt_mlockall) {
// Lock all memory into ram. init should never be "swapped out".
if (mlockall(MCL_CURRENT | MCL_FUTURE))
log_error("mlockall: %s", strerror(errno));
}
// fork and setsid if requested, but not if PID 1 or interactive
if (opt_daemonize) {
if (getpid() == 1 || opt_interactive)
log_warn("Ignoring --daemonize (see manual)");
else
daemonize();
}
// terminate is disabled when running as init, so this is an infinite loop
// (except when debugging)
wake->now= gettime_mon_frac();
while (!main_terminate) {
// set our wait parameters so other methods can inject new wake reasons
wake->next= wake->now + (200LL<<32); // wake at least every 200 seconds
wake->max_fd= -1;
log_run();
// collect new signals since last iteration and set read-wake on signal fd
sig_run();
// reap all zombies, possibly waking services
while ((pid= waitpid(-1, &wstat, WNOHANG)) > 0) {
log_trace("waitpid found pid = %d", (int)pid);
if ((svc= svc_by_pid(pid)))
svc_handle_reaped(svc, wstat);
else
log_trace("pid does not belong to any service");
}
if (pid < 0)
log_trace("waitpid: %s", strerror(errno));
// run state machine of each service that is active.
svc_run_active();
// possibly accept new controller connections
control_socket_run();
// run controller state machines
ctl_run();
log_run();
// Wait until an event or the next time a state machine needs to run
// (state machines edit wake.next)
wake->now= gettime_mon_frac();
if (wake->next - wake->now > 0) {
tv.tv_sec= (long)((wake->next - wake->now) >> 32);
tv.tv_usec= (long)((((wake->next - wake->now)&0xFFFFFFFFLL) * 1000000) >> 32);
log_trace("wait up to %d.%d sec", tv.tv_sec, tv.tv_usec);
}
else
static void server_run(void)
{
analy_run();
monitor_run();
log_run();
}
