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 35