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//===-- Linux implementation of tcsetattr ---------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/termios/tcsetattr.h"
#include "kernel_termios.h"
#include "src/__support/OSUtil/syscall.h"
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include <asm/ioctls.h> // Safe to include without the risk of name pollution.
#include <sys/syscall.h> // For syscall numbers
#include <termios.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, tcsetattr,
(int fd, int actions, const struct termios *t)) {
struct kernel_termios kt;
long cmd;
switch (actions) {
case TCSANOW:
cmd = TCSETS;
break;
case TCSADRAIN:
cmd = TCSETSW;
break;
case TCSAFLUSH:
cmd = TCSETSF;
break;
default:
libc_errno = EINVAL;
return -1;
}
kt.c_iflag = t->c_iflag;
kt.c_oflag = t->c_oflag;
kt.c_cflag = t->c_cflag;
kt.c_lflag = t->c_lflag;
size_t nccs = KERNEL_NCCS <= NCCS ? KERNEL_NCCS : NCCS;
for (size_t i = 0; i < nccs; ++i)
kt.c_cc[i] = t->c_cc[i];
if (nccs < KERNEL_NCCS) {
for (size_t i = nccs; i < KERNEL_NCCS; ++i)
kt.c_cc[i] = 0;
}
int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_ioctl, fd, cmd, &kt);
if (ret < 0) {
libc_errno = -ret;
return -1;
}
return 0;
}
} // namespace LIBC_NAMESPACE_DECL
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