48 lines · cpp
1//===-- Linux implementation of tcgetattr ---------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/termios/tcgetattr.h"10#include "kernel_termios.h"11 12#include "src/__support/OSUtil/syscall.h"13#include "src/__support/common.h"14#include "src/__support/libc_errno.h"15#include "src/__support/macros/config.h"16 17#include <asm/ioctls.h> // Safe to include without the risk of name pollution.18#include <sys/syscall.h> // For syscall numbers19#include <termios.h>20 21namespace LIBC_NAMESPACE_DECL {22 23LLVM_LIBC_FUNCTION(int, tcgetattr, (int fd, struct termios *t)) {24 LIBC_NAMESPACE::kernel_termios kt;25 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, TCGETS, &kt);26 if (ret < 0) {27 libc_errno = -ret;28 return -1;29 }30 t->c_iflag = kt.c_iflag;31 t->c_oflag = kt.c_oflag;32 t->c_cflag = kt.c_cflag;33 t->c_lflag = kt.c_lflag;34 t->c_ispeed = kt.c_cflag & CBAUD;35 t->c_ospeed = kt.c_cflag & CBAUD;36 37 size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS;38 for (size_t i = 0; i < nccs; ++i)39 t->c_cc[i] = kt.c_cc[i];40 if (NCCS > nccs) {41 for (size_t i = nccs; i < NCCS; ++i)42 t->c_cc[i] = 0;43 }44 return 0;45}46 47} // namespace LIBC_NAMESPACE_DECL48