linux 设备文件 读写

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

int main() {
    int fd = open("/dev/tty1", O_RDONLY);
    if (fd == -1) {
        perror("open");
        return 1;
    }

    char buffer[128];
    ssize_t bytesRead = read(fd, buffer, sizeof(buffer) - 1);
    if (bytesRead == -1) {
        perror("read");
        close(fd);
        return 1;
    }

    buffer[bytesRead] = '\0';
    printf("Read from device: %s\n", buffer);

    close(fd);
    return 0;
}

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

int main() {
    int fd = open("/dev/tty1", O_WRONLY);
    if (fd == -1) {
        perror("open");
        return 1;
    }

    const char *message = "Hello, Device!\n";
    ssize_t bytesWritten = write(fd, message, strlen(message));
    if (bytesWritten == -1) {
        perror("write");
        close(fd);
        return 1;
    }

    close(fd);
    return 0;
}