/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2020 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/calls/struct/sigset.h"
#include "libc/sysv/consts/limits.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"

/**
 * Adds signal to set.
 *
 * @return 0 on success, or -1 w/ errno
 * @raise EINVAL if `1 â¤ sig â¤ NSIG` isn't the case
 * @asyncsignalsafe
 */
int sigaddset(sigset_t *set, int sig) {
  _Static_assert(NSIG == sizeof(set->__bits) * CHAR_BIT, "");
  _Static_assert(sizeof(set->__bits[0]) * CHAR_BIT == 64, "");
  if (1 <= sig && sig <= NSIG) {
    if (1 <= sig && sig <= _NSIG) {
      set->__bits[(sig - 1) >> 6] |= 1ull << ((sig - 1) & 63);
    }
    return 0;
  } else {
    return einval();
  }
}
