cosmopolitan/libc/calls/sigcheck.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 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/sig.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/errfuns.h"

textwindows int __sigcheck(sigset_t waitmask, bool restartable) {
  int sig, handler_was_called = 0;
  if (_check_cancel() == -1)
    return -1;
  while (_weaken(__sig_get) && (sig = _weaken(__sig_get)(waitmask))) {
    handler_was_called |= _weaken(__sig_relay)(sig, SI_KERNEL, waitmask);
    if (_check_cancel() == -1)
      return -1;
  }
  if (handler_was_called & SIG_HANDLED_NO_RESTART)
    return eintr();
  if (handler_was_called & SIG_HANDLED_SA_RESTART)
    if (!restartable)
      return eintr();
  return 0;
}