libc/src/__support/OSUtil/linux/exit.cpp

   1 //===------------ Linux implementation of an exit function ------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/__support/common.h"
  10 #include "src/__support/macros/config.h"
  11 #include "syscall.h"     // For internal syscall function.
  12 #include <sys/syscall.h> // For syscall numbers.
  13
  14 namespace LIBC_NAMESPACE_DECL {
  15 namespace internal {
  16
  17 // mark as no_stack_protector for x86 since TLS can be torn down before calling
  18 // exit so that the stack protector canary cannot be loaded.
  19 #ifdef LIBC_TARGET_ARCH_IS_X86
  20 __attribute__((no_stack_protector))
  21 #endif
  22 __attribute__((noreturn)) void
  23 exit(int status) {
  24   for (;;) {
  25     LIBC_NAMESPACE::syscall_impl<long>(SYS_exit_group, status);
  26     LIBC_NAMESPACE::syscall_impl<long>(SYS_exit, status);
  27   }
  28 }
  29
  30 } // namespace internal
  31 } // namespace LIBC_NAMESPACE_DECL