/*-*- 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 2020 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/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/struct/sigset.h"
#include "libc/dce.h"
#include "libc/intrin/asan.internal.h"
#include "libc/sysv/errfuns.h"

/**
 * Blocks until SIG ∉ MASK is delivered to process.
 *
 * @param ignore is a bitset of signals to block temporarily
 * @return -1 w/ EINTR
 * @asyncsignalsafe
 */
int sigsuspend(const sigset_t *ignore) {
  int rc;
  char buf[41];
  if (!ignore || (IsAsan() && !__asan_is_valid(ignore, sizeof(*ignore)))) {
    rc = efault();
  } else if (!IsWindows()) {
    STRACE("sigsuspend(%s)", __strace_sigset(buf, sizeof(buf), 0, ignore));
    if (IsOpenbsd()) ignore = (sigset_t *)(uintptr_t)(*(uint32_t *)ignore);
    return sys_sigsuspend(ignore, 8);
  } else {
    rc = enosys(); /* TODO(jart): Implement me! */
  }
  STRACE("sigsuspend(%s) → %d% m", __strace_sigset(buf, sizeof(buf), 0, ignore),
         rc);
  return rc;
}