How to use the mount(2) function to mount an hfs volume

After two days of searching through documents on the mount(2) function, I was finally relieved with the help of a forum poster Alex B on stackoverflow.

The particular need for my want to learn how to use mount(), opposed to just setting up a system() call, is quite odd and has to do with encryption algorithms temporarily writing to a disk... I won't get into that, but I will show you how to force an update on a volume that has already been mounted in single user mode as read only, in this case it will be "/"

#import //For mount()

#import //for hfs_mount_args

#import // for #define'd constants

// Outline of an hfs specific struct

/*

 struct hfs_mount_args {

 char     *fspec; ****name of the device e.g:"/dev/disk0s2"

uid_t     hfs_uid; 

gid_t     hfs_gid;

mode_t    hfs_mask;

u_int32_t hfs_encoding;

struct    timezone hfs_timezone;

int       flags;

int       journal_tbuffer_size;

int       journal_flags;

int       journal_disable;

};

*/

int main (int argc, const char * argv[]) {

struct hfs_mount_args some_data; //Declare your struct

int options = 0; //Declare your options variable

int result = 0 //Declare a return variable

some_data.fspec = strdup("/dev/disk0s2"); //Specify a device to be mounted

options = MNT_UPDATE | MNT_NOEXEC; //Forces the volume to not allow executables to run

result = mount("hfs", "/", options ,&some_data);//Mount it

NSLog(@"%d",result);//should return 0 on a successful mount

/* add some more code here*/

return 0;//exit

}