/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
│                                                                              │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/calls/struct/sigset.h"

int sys_sigprocmask(int how, const sigset_t *opt_set,
                    sigset_t *opt_out_oldset) {
  int res, rc, arg1;
  sigset_t old = {0};
  const sigset_t *arg2;
  if (!IsOpenbsd()) {
    rc = __sys_sigprocmask(how, opt_set, opt_out_oldset ? &old : 0, 8);
  } else {
    if (opt_set) {
      // openbsd only supports 32 signals so it passses them in a reg
      arg1 = how;
      arg2 = (sigset_t *)(uintptr_t)(*(uint32_t *)opt_set);
    } else {
      arg1 = how;  // SIG_BLOCK
      arg2 = 0;    // changes nothing
    }
    if ((res = __sys_sigprocmask(arg1, arg2, 0, 0)) != -1) {
      memcpy(&old, &res, sizeof(res));
      rc = 0;
    } else {
      rc = -1;
    }
  }
  if (rc != -1 && opt_out_oldset) {
    *opt_out_oldset = old;
  }
  return rc;
}