signal_destroy.c

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/*
** Copyright (C) 2005 by Kevin L. Mitchell <klmitch@mit.edu>
**
** This program 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 2 of the License, or
** (at your option) any later version.
**
** This program 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 this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
**
** @(#)$Id: signal_destroy.c,v 1.1 2005/09/15 18:14:11 klmitch Exp $
*/
#include "engines_int.h"

RCSTAG("@(#)$Id: signal_destroy.c,v 1.1 2005/09/15 18:14:11 klmitch Exp $");

ev_err_t
signal_destroy(ev_ctx_t *ctx, ev_sig_t *sig)
{
  ev_engine_t *eng;
  ev_err_t err = 0, err2;

  ev_init(); /* make sure library is initialized... */

  /* sanity-check the arguments... */
  if (!ec_verify(ctx) || !si_verify(sig) || eg_context(sig) != ctx)
    ev_return(EINVAL);

  if (eg_flags(sig) & EV_GEN_DELETED) /* skip already deleted signals */
    ev_return(0);

  /* Walk through all the signal engines (last to first)... */
  for (eng = ctx->ec_signal.el_last; eng;
       eng = eng->eng_signal.esi_active.el_prev)
    if ((err2 = eng_sig_rem(ctx, eng, sig)) && !err) /* remove the signal... */
      err = err2; /* don't interrupt removal, but remember error code */

  eg_flags_set(sig, EV_GEN_DELETED); /* mark it as deleted */

  /* decrement the reference count */
  eg_ref_dec(ctx, sig);

  ev_return(err);
}

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