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-exception
6//
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 numbers
19#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_DECL
48

source code of libc/src/termios/linux/tcgetattr.cpp