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Operating Systems Linux C++ Code to Access Linux Hard Disk Sectors (with a LoopBack Virtual Hard Disk) Post 302490917 by shen747 on Wednesday 26th of January 2011 06:17:37 AM
Old 01-26-2011
Question

Quote:
Originally Posted by dsw
Check the perms on /dev/loop0

Code:
ls -l /dev/loop0

HI dsw,

I changed the permissions of the /dev/loop0 to chmod 777 & then ran the command you gave and got the following results :

Code:
brw-rw---- 1 root disk 7, 0 2011-01-26 16:39 /dev/loop0

But now when I run the above Program I've written using the command prompt the following output appears :

Code:
Implementation of the File Handler Read Method...
Segmentation fault


Last edited by shen747; 01-26-2011 at 07:25 AM..
 

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DISKTYPE(1)						    BSD General Commands Manual 					       DISKTYPE(1)

NAME
disktype -- disk format detector SYNOPSIS
disktype file... DESCRIPTION
The purpose of disktype is to detect the content format of a disk or disk image. It knows about common file systems, partition tables, and boot codes. USAGE
disktype can be run with any number of regular files or device special files as arguments. They will be analyzed in the order given, and the results printed to standard output. There are no switches in this version. Note that running disktype on device files like your hard disk will likely require root rights. See the online documentation at <http://disktype.sourceforge.net/doc/> for some example command lines. RECOGNIZED FORMATS
The following formats are recognized by this version of disktype. File systems: FAT12/FAT16/FAT32, NTFS, HPFS, MFS, HFS, HFS Plus, ISO9660, ext2/ext3, Minix, ReiserFS, Reiser4, Linux romfs, Linux cramfs, Linux squashfs, UFS (some variations), SysV FS (some variations), JFS, XFS, Amiga FS/FFS, BeOS BFS, QNX4 FS, UDF, 3DO CD-ROM file system, Veritas VxFS, Xbox DVD file system. Partitioning: DOS/PC style, Apple, Amiga "Rigid Disk", ATARI ST (AHDI3), BSD disklabel, Linux RAID physical disks, Linux LVM1 physical volumes, Linux LVM2 physical volumes, Solaris x86 disklabel (vtoc), Solaris SPARC disklabel. Other structures: Debian split floppy header, Linux swap. Disk images: Raw CD image (.bin), Virtual PC hard disk image, Apple UDIF disk image (limited). Boot codes: LILO, GRUB, SYSLINUX, ISOLINUX, Linux kernel, FreeBSD loader, Sega Dreamcast (?). Compression formats: gzip, compress, bzip2. Archive formats: tar, cpio, bar, dump/restore. Compressed files (gzip, compress, bzip2 formats) will also have their contents analyzed using transparent decompression. The appropriate com- pression program must be installed on the system, i.e. gzip(1) for the gzip and compress formats, bzip2(1) for the bzip2 format. Disk images in general will also have their contents analyzed using the proper mapping, with the exception of the Apple UDIF format. See the online documentation at <http://disktype.sourceforge.net/doc/> for more details on the supported formats and their quirks. HOMEPAGE
http://disktype.sourceforge.net/ AUTHOR
Christoph Pfisterer <chrisp@users.sourceforge.net> SEE ALSO
file(1), gpart(8) Feb 21, 2005
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