int main(int argc ,char*argv[])
{
int fd;
// int ret;
char*msg;
int choice;
int ret1;
int ret;
fd=open(argv[1],O_RDWR|O_CREAT,0666);
if(fd==-1)
{
perror(" ");
exit(1);
}
// ioctl(fd, IOCTL_SET_MSG,"vishnu");
// ret=ioctl(fd,IOCTL_SET,msg);
// printf("IOCTL_SET_MSG=%d\n",DN_SETCOUNT);
printf("1.WRITE\t 2.READ\t 3. EXIT\n");
while(1)
{
printf("enter choice\n");
scanf("%d",&choice);
__fpurge(stdin);;
switch(choice)
{
case 1:
printf("in user write\n");
ioctl(fd,IOCTL_SET_MSG,"prashant");
if(ret==-1)
{
perror(" ");
exit(2);
}
break;
case 2:
printf("in user read\n");
ret1=ioctl_get_msg(fd);
if(ret1==-1)
{
perror(" ");
exit(1);
}
break;
case 3:
exit(1);
}
}
}
int
main(int argc, char **argv)
{
int fd, error = 0;
char zvol_name[ZFS_MAXNAMELEN], zvol_name_part[ZFS_MAXNAMELEN];
char *dev_name;
struct stat statbuf;
int dev_minor, dev_part;
int i;
if (argc < 2) {
printf("Usage: %s /dev/zvol_device_node\n", argv[0]);
return (EINVAL);
}
dev_name = argv[1];
error = stat(dev_name, &statbuf);
if (error != 0) {
printf("Unable to access device file: %s\n", dev_name);
return (errno);
}
dev_minor = minor(statbuf.st_rdev);
dev_part = dev_minor % ZVOL_MINORS;
fd = open(dev_name, O_RDONLY);
if (fd < 0) {
printf("Unable to open device file: %s\n", dev_name);
return (errno);
}
error = ioctl_get_msg(zvol_name, fd);
if (error < 0) {
printf("ioctl_get_msg failed:%s\n", strerror(errno));
return (errno);
}
if (dev_part > 0)
snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s-part%d", zvol_name,
dev_part);
else
snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s", zvol_name);
for (i = 0; i < strlen(zvol_name_part); i++) {
if (isblank(zvol_name_part[i]))
zvol_name_part[i] = '+';
}
printf("%s\n", zvol_name_part);
close(fd);
return (error);
}
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);
}
int main() {
int fd, status;
printf("opening device %s\n", DEVICE_FILE_NAME);
while (1) {
fd = open(DEVICE_FILE_NAME, O_RDWR);
if (fd < 0) {
perror("file open faild");
exit(1);
}
ioctl_get_msg(fd);
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);
}
