How to pass IOCTL arguments from usespace ioctl call

devkpict · 12-06-2007, 11:50 PM

Hi All,

I am calling ext3_ioctl, using ioctl() call in userspace,

I need guidence for passing arguments with ioctl() from

userspace.

osor · 12-07-2007, 06:45 PM

Have you looked at man 2 ioctl? What exactly do you want to do? Something like the following?

Code:

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

#include <sys/ioctl.h>
#include <linux/fs.h>
#include <linux/ext3_fs.h>

int main(int argc, char *argv[])
{
	int fd, flags = EXT3_SYNC_FL;
	if(argc != 2) {
		fprintf(stderr, "Usage: %s filename\n", argv[0]);
		exit(EXIT_FAILURE);
	}
	if((fd = open(argv[1], O_RDWR)) == -1) {
		perror("open");
		exit(EXIT_FAILURE);
	}
	if(ioctl(fd, EXT3_IOC_SETFLAGS, &flags) == -1) {
		perror("ioctl");
		close(fd);
		exit(EXIT_FAILURE);
	}
	exit(EXIT_SUCCESS);
}