server/admin.c: Remove spurious `ping' in usage message.

[tripe] / server / tripe.c

/* -*-c-*-
 *
 * Main program
 *
 * (c) 2001 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of Trivial IP Encryption (TrIPE).
 *
 * TrIPE is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your
 * option) any later version.
 *
 * TrIPE is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with TrIPE.  If not, see <https://www.gnu.org/licenses/>.
 */

/*----- Header files ------------------------------------------------------*/

#include "tripe.h"

/*----- Global variables --------------------------------------------------*/

sel_state sel;

/*----- Static variables --------------------------------------------------*/

static sel_timer it;
#define T_INTERVAL MIN(1)

static unsigned iv_nreasons = 0;
static struct timeval iv_next = { 0, 0 };
static int lpdone = 0;

/*----- The interval timer ------------------------------------------------*/

/* --- @interval@ --- *
 *
 * Arguments:	@struct timeval *tv@ = time when called
 *		@void *v@ = boring pointer
 *
 * Returns:	---
 *
 * Use:		Called periodically to do housekeeping tasks.
 */

static void interval(struct timeval *tv, void *v)
{
  T( trace(T_PEER, "peer: interval timer"); )
  iv_next = *tv;
  rand_seed(RAND_GLOBAL, MAXHASHSZ);
  p_interval();
  iv_next.tv_sec += T_INTERVAL;
  sel_addtimer(&sel, &it, &iv_next, interval, v);
}

/* --- @iv_addreason@ --- *
 *
 * Arguments:	---
 *
 * Returns:	---
 *
 * Use:		Adds an `interval timer reason'; if there are no others, the
 *		interval timer is engaged.
 */

void iv_addreason(void)
{
  struct timeval tv;

  if (!iv_nreasons) {
    gettimeofday(&tv, 0);
    if (TV_CMP(&tv, >=, &iv_next)) interval(&tv, 0);
    else sel_addtimer(&sel, &it, &iv_next, interval, 0);
  }
  iv_nreasons++;
}

/* --- @iv_rmreason@ --- *
 *
 * Arguments:	---
 *
 * Returns:	---
 *
 * Use:		Removes an interval timer reason; if there are none left, the
 *		interval timer is disengaged.
 */

void iv_rmreason(void)
{
  assert(iv_nreasons); iv_nreasons--;
  if (!iv_nreasons) sel_rmtimer(&it);
}

/*----- The main loop -----------------------------------------------------*/

/* --- @lp_init@ --- *
 *
 * Arguments:	---
 *
 * Returns:	---
 *
 * Use:		Initializes the main loop.  Most importantly, this sets up
 *		the select multiplexor that everything else hooks onto.
 */

void lp_init(void)
{
  gettimeofday(&iv_next, 0); iv_next.tv_sec += T_INTERVAL;
  signal(SIGPIPE, SIG_IGN);
  sel_init(&sel);
  sig_init(&sel);
}

/* --- @lp_end@ --- *
 *
 * Arguments:	---
 *
 * Returns:	---
 *
 * Use:		Requests an exit from the main loop.
 */

void lp_end(void) { lpdone = 1; }

/* --- @lp_run@ --- *
 *
 * Arguments:	---
 *
 * Returns:	Zero on successful termination; @-1@ if things went wrong.
 *
 * Use:		Cranks the main loop until it should be cranked no more.
 */

int lp_run(void)
{
  int nerr = 0;

  for (;;) {
    a_preselect();
    if (lpdone) break;
    if (!sel_select(&sel)) nerr = 0;
    else if (errno != EINTR && errno != EAGAIN) {
      a_warn("SERVER", "select-error", "?ERRNO", A_END);
      nerr++;
      if (nerr > 8) {
	a_warn("ABORT", "repeated-select-errors", A_END);
	abort();
      }
    }
  }
  lpdone = 0;
  return (0);
}

/*----- That's all, folks -------------------------------------------------*/