libc/src/termios/linux/tcsendbreak.cpp

   1 //===-- Linux implementation of tcsendbreak -------------------------------===//
   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/termios/tcsendbreak.h"
  10
  11 #include "src/__support/OSUtil/syscall.h"
  12 #include "src/__support/common.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15
  16 #include <asm/ioctls.h> // Safe to include without the risk of name pollution.
  17 #include <sys/syscall.h> // For syscall numbers
  18 #include <termios.h>
  19
  20 namespace LIBC_NAMESPACE_DECL {
  21
  22 LLVM_LIBC_FUNCTION(pid_t, tcsendbreak, (int fd, int /* unused duration */)) {
  23   // POSIX leaves the behavior for non-zero duration implementation dependent.
  24   // Which means that the behavior can be the same as it is when duration is
  25   // zero. So, we just pass zero to the syscall.
  26   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCSBRK, 0);
  27   if (ret < 0) {
  28     libc_errno = -ret;
  29     return -1;
  30   }
  31   return 0;
  32 }
  33
  34 } // namespace LIBC_NAMESPACE_DECL