1//===-- Linux implementation of tcsetattr ---------------------------------===//
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/tcsetattr.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, tcsetattr,
24 (int fd, int actions, const struct termios *t)) {
25 struct kernel_termios kt;
26 long cmd;
27
28 switch (actions) {
29 case TCSANOW:
30 cmd = TCSETS;
31 break;
32 case TCSADRAIN:
33 cmd = TCSETSW;
34 break;
35 case TCSAFLUSH:
36 cmd = TCSETSF;
37 break;
38 default:
39 libc_errno = EINVAL;
40 return -1;
41 }
42
43 kt.c_iflag = t->c_iflag;
44 kt.c_oflag = t->c_oflag;
45 kt.c_cflag = t->c_cflag;
46 kt.c_lflag = t->c_lflag;
47 size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS;
48 for (size_t i = 0; i < nccs; ++i)
49 kt.c_cc[i] = t->c_cc[i];
50 if (nccs < KERNEL_NCCS) {
51 for (size_t i = nccs; i < KERNEL_NCCS; ++i)
52 kt.c_cc[i] = 0;
53 }
54
55 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, cmd, &kt);
56 if (ret < 0) {
57 libc_errno = -ret;
58 return -1;
59 }
60 return 0;
61}
62
63} // namespace LIBC_NAMESPACE_DECL
64

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