04clock_01misc_app_write

Posted 2020-08-31 莽莽丛林

 1 #include <stdio.h>
 2 #include <sys/stat.h>
 3 #include <fcntl.h>
 4 #include <unistd.h>
 5 
 6 #define DEV_NAME "/dev/my_led"
 7 
 8 int main(int argc, char const *argv[])
 9 {
10     
11     int  fd = open(DEV_NAME, O_RDWR);
12     if(fd < 0) {
13         perror("open");
14         return -1;
15     }
16 
17     char buf[10] = "1234567890";
18 
19     //int ret = read(fd, buf, 10);
20     //printf("buf = %s\n", buf);
21 
22     write(fd, buf, 10); 
23 
24     close(fd);
25     return 0;
26 }