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Old 12-07-2007, 12:50 AM   #1
devkpict
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Registered: Oct 2007
Posts: 31

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Thumbs up How to pass IOCTL arguments from usespace ioctl call


Hi All,

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

I need guidence for passing arguments with ioctl() from

userspace.
 
Old 12-07-2007, 07:45 PM   #2
osor
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Registered: Jan 2006
Distribution: (H)LFS, Gentoo
Posts: 2,450

Rep: Reputation: 70
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);
}
 
  


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