main ()
{
int file_desc, ret_val;
char *msg = "Message passed by ioctl\n";
file_desc = open(DEVICE_FILE_NAME, 0);
if (file_desc < 0) {
printf("Can't open device file: %s\n", DEVICE_FILE_NAME);
exit(-1);
}
ioctl_get_nth_byte(file_desc);
ioctl_get_msg(file_desc);
ioctl_set_msg(file_desc, msg);
close(file_desc);
}
/*
main()
//*/
int main(void)
{
int fd=0, ret=0;
char* msg = "message passed by ioctl\n";
fd = open(DEVICE_FILE_NAME, 0);
if(0 > fd) {
printf("can't open device file: %s\n", DEVICE_FILE_NAME);
exit(EXIT_FAILURE);
}
ioctl_get_nth_byte(fd);
ioctl_get_msg(fd);
ioctl_set_msg(fd, msg);
close(fd);
}
/*
* Main - Call the ioctl functions
*/
int main(int argc, char *argv[])
{
int file_desc;
char buf[1024];
struct timeval tv;
file_desc = open(DEVICE_FILE_NAME, 0);
if (file_desc < 0) {
printf("Can't open device file: %s\n", DEVICE_FILE_NAME);
exit(-1);
}
gettimeofday(&tv, NULL);
snprintf(buf, 1024, "%ld.%06ld:Message passed by ioctl\n", tv.tv_sec, tv.tv_usec);
ioctl_get_nth_byte(file_desc);
ioctl_get_msg(file_desc);
ioctl_set_msg(file_desc, buf);
close(file_desc);
return 0;
}
int main(int argc,char **argv)
{
char msg[80];
int fd=-1;
if(argc!=2) {
printf("Usage <dev file name>\n");
return -1;
}
fd=open(argv[1],O_RDONLY|O_WRONLY);
if(fd < 0) {
printf("Unable to open the device file\n");
return -2;
}
printf("calling ioctl_get_msg function\n");
ioctl_get_msg(fd);
printf("calling ioctl_set_msg function\n");
strcpy(msg,"Hello world\n");
ioctl_set_msg(fd,msg);
printf("calling ioctl_get_nth_byte functio\n");
ioctl_get_nth_byte(fd);
close(fd);
}
