Improve isystem includes and magic numbers

libc/calls/reboot.c

@@ -0,0 +1,93 @@
+/*-*- 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 2021 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/struct/framebuffervirtualscreeninfo.h"
+#include "libc/dce.h"
+#include "libc/nt/system.h"
+#include "libc/runtime/runtime.h"
+#include "libc/sysv/errfuns.h"
+
+#define kNtShutdownForceOthers   1
+#define kNtShutdownForceSelf     2
+#define kNtShutdownGraceOverride 0x20
+#define kNtShutdownHybrid        0x200
+
+int32_t sys_reboot_linux(int32_t, int32_t, int32_t) asm("sys_reboot");
+int32_t sys_reboot_bsd(int32_t, const char *) asm("sys_reboot");
+
+/**
+ * Reboots system.
+ *
+ * The `howto` argument may be one of the following:
+ *
+ * - `RB_AUTOBOOT`
+ * - `RB_POWER_OFF`
+ * - `RB_HALT_SYSTEM`
+ * - `RB_SW_SUSPEND` (linux and windows only)
+ * - `RB_KEXEC` (linux only)
+ * - `RB_ENABLE_CAD` (linux only)
+ * - `RB_DISABLE_CAD` (linux only)
+ *
+ * There's an implicit `sync()` operation before the reboot happens.
+ * This can be prevented by or'ing `howto` with `RB_NOSYNC`. Setting
+ * this option will also prevent apps on Windows from having time to
+ * close themselves.
+ */
+int reboot(int howto) {
+  bool ok, immediately;
+  if (howto != -1) {
+    if (!(howto & 0x20000000)) {
+      sync();
+      immediately = false;
+    } else {
+      howto &= ~0x20000000;
+      immediately = true;
+    }
+    if (!IsWindows()) {
+      if (IsLinux()) {
+        return sys_reboot_linux(0xFEE1DEAD, 0x28121969, howto);
+      } else {
+        return sys_reboot_bsd(howto, 0);
+      }
+    } else {
+      if (howto == 0xD000FCE2u) {
+        ok = !!SetSuspendState(0, 0, 0);
+      } else {
+        howto |= kNtShutdownForceOthers;
+        howto |= kNtShutdownForceSelf;
+        if (NtGetVersion() >= 8) {
+          howto |= kNtShutdownHybrid;
+        }
+        if (immediately) {
+          ok = !!InitiateShutdown(0, 0, 0, howto | kNtShutdownGraceOverride, 0);
+        } else {
+          ok = !!InitiateShutdown(0, 0, 20, howto, 0);
+        }
+      }
+      if (ok) {
+        return 0;
+      } else {
+        return -1;
+      }
+    }
+  } else {
+    return einval();
+  }
+}