LinuxQuestions.org - How to pass IOCTL arguments from usespace ioctl call

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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.

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);

}