/*-*- 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/atomic.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/dce.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/subprocess.h"
#include "libc/testlib/testlib.h"

int i, *p;

void SetUp(void) {
  p = _mapshared(FRAMESIZE);
}

void TearDown(void) {
  munmap(p, FRAMESIZE);
}

void AtExit3(void) {
  p[i++] = 3;
}

void AtExit2(void) {
  p[i++] = 2;
  exit(2);
}

void AtExit1(void) {
  p[i++] = 1;
  atexit(AtExit2);
  exit(1);
}

// consistent with glibc, musl, freebsd, openbsd & netbsd
// please note posix says recursion is undefined behavior
// however, fifo ordering of atexit handlers is specified
TEST(exit, test) {
  SPAWN(fork);
  atexit(AtExit3);
  atexit(AtExit3);
  atexit(AtExit1);
  exit(0);
  EXITS(2);
  ASSERT_EQ(1, p[0]);
  ASSERT_EQ(2, p[1]);
  ASSERT_EQ(3, p[2]);
  ASSERT_EQ(3, p[3]);
}

TEST(exit, narrowing) {
  SPAWN(vfork);
  _Exit(31337);
  EXITS(IsWindows() || IsNetbsd() || IsOpenbsd() ? 31337 : 31337 & 255);
}

TEST(exit, exitCode259_wontCauseParentProcessToHangForever) {
  if (!IsWindows()) return;
  SPAWN(vfork);
  _Exit(259);
  EXITS(259);
}

TEST(exit, sigkill) {
  int ws, pid;
  atomic_int *ready = _mapshared(4);
  ASSERT_NE(-1, (pid = fork()));
  if (!pid) {
    for (*ready = 1;;) {
      pause();
    }
  }
  while (!*ready) donothing;
  ASSERT_EQ(0, kill(pid, SIGKILL));
  ASSERT_SYS(0, pid, wait(&ws));
  ASSERT_EQ(SIGKILL, ws);
  munmap(ready, 4);
}

// NetBSD is the only operating system that ignores SIGPWR by default

TEST(exit, sigalrm) {
  int ws, pid;
  sighandler_t oldint = signal(SIGALRM, SIG_DFL);
  atomic_int *ready = _mapshared(4);
  ASSERT_NE(-1, (pid = fork()));
  if (!pid) {
    for (*ready = 1;;) {
      pause();
    }
  }
  while (!*ready) donothing;
  ASSERT_EQ(0, kill(pid, SIGALRM));
  ASSERT_SYS(0, pid, wait(&ws));
  ASSERT_EQ(SIGALRM, ws);
  munmap(ready, 4);
  signal(SIGALRM, oldint);
}