tcseta(2const)

#include <asm/termbits.h>\n  /* Definition of \nTC*\n constants */
\n#include <sys/ioctl.h>

int ioctl(int \nfd\n, TCGETS, struct termios *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETS, const struct termios *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETSW, const struct termios *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETSF, const struct termios *\nargp\n);

int ioctl(int \nfd\n, TCGETS2, struct termios2 *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETS2, const struct termios2 *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETSW2, const struct termios2 *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETSF2, const struct termios2 *\nargp\n);

int ioctl(int \nfd\n, TCGETA, struct termio *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETA, const struct termio *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETAW, const struct termio *\nargp\n);\n
\nint ioctl(int \nfd\n, TCSETAF, const struct termio *\nargp\n);

#include <asm/termbits.h>

struct termios;\n
\nstruct termios2;\n
\nstruct termio;

/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <asm/termbits.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
#if !defined BOTHER
\n
    fprintf(stderr, "BOTHER is unsupported\n");
\n
    /* Program may fallback to TCGETS/TCSETS with Bnnn constants */
\n
    exit(EXIT_FAILURE);
#else
\n
    /* Declare tio structure, its type depends on supported ioctl */
# if defined TCGETS2
\n
    struct termios2 tio;
# else
\n
    struct termios tio;
# endif
\n
    int fd, rc;
\n
    if (argc != 2 && argc != 3 && argc != 4) {
\n
        fprintf(stderr, "Usage: %s device [output [input] ]\n", argv[0]);
\n
        exit(EXIT_FAILURE);
\n
    }
\n
    fd = open(argv[1], O_RDWR | O_NONBLOCK | O_NOCTTY);
\n
    if (fd < 0) {
\n
        perror("open");
\n
        exit(EXIT_FAILURE);
\n
    }
\n
    /* Get the current serial port settings via supported ioctl */
# if defined TCGETS2
\n
    rc = ioctl(fd, TCGETS2, &tio);
# else
\n
    rc = ioctl(fd, TCGETS, &tio);
# endif
\n
    if (rc) {
\n
        perror("TCGETS");
\n
        close(fd);
\n
        exit(EXIT_FAILURE);
\n
    }
\n
    /* Change baud rate when more arguments were provided */
\n
    if (argc == 3 || argc == 4) {
\n
        /* Clear the current output baud rate and fill a new value */
\n
        tio.c_cflag &= ~CBAUD;
\n
        tio.c_cflag |= BOTHER;
\n
        tio.c_ospeed = atoi(argv[2]);
\n
        /* Clear the current input baud rate and fill a new value */
\n
        tio.c_cflag &= ~(CBAUD << IBSHIFT);
\n
        tio.c_cflag |= BOTHER << IBSHIFT;
\n
        /* When 4th argument is not provided reuse output baud rate */
\n
        tio.c_ispeed = (argc == 4) ? atoi(argv[3]) : atoi(argv[2]);
\n
        /* Set new serial port settings via supported ioctl */
# if defined TCSETS2
\n
        rc = ioctl(fd, TCSETS2, &tio);
# else
\n
        rc = ioctl(fd, TCSETS, &tio);
# endif
\n
        if (rc) {
\n
            perror("TCSETS");
\n
            close(fd);
\n
            exit(EXIT_FAILURE);
\n
        }
\n
        /* And get new values which were really configured */
# if defined TCGETS2
\n
        rc = ioctl(fd, TCGETS2, &tio);
# else
\n
        rc = ioctl(fd, TCGETS, &tio);
# endif
\n
        if (rc) {
\n
            perror("TCGETS");
\n
            close(fd);
\n
            exit(EXIT_FAILURE);
\n
        }
\n
    }
\n
    close(fd);
\n
    printf("output baud rate: %u\n", tio.c_ospeed);
\n
    printf("input baud rate: %u\n", tio.c_ispeed);
\n
    exit(EXIT_SUCCESS);
#endif
}