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Operating Systems Linux C++ Code to Access Linux Hard Disk Sectors (with a LoopBack Virtual Hard Disk) Post 302490969 by Corona688 on Wednesday 26th of January 2011 10:17:20 AM
Old 01-26-2011
Personally I'd use the open()/read()/write() calls instead of the stdio fopen()/fread()/fwrite() calls. You'll get more direct, unbuffered access; more useful error messages via perror() or errno; and a real file descriptor to call ioctl() on should you end up needing it. (which you might, dealing with block devices.)
 

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FREAD(3S)																 FREAD(3S)

NAME
fread, fwrite - buffered binary input/output SYNOPSIS
#include <stdio.h> fread(ptr, sizeof(*ptr), nitems, stream) FILE *stream; fwrite(ptr, sizeof(*ptr), nitems, stream) FILE *stream; DESCRIPTION
Fread reads, into a block beginning at ptr, nitems of data of the type of *ptr from the named input stream. It returns the number of items actually read. If stream is stdin and the standard output is line buffered, then any partial output line will be flushed before any call to read(2) to satisfy the fread. Fwrite appends at most nitems of data of the type of *ptr beginning at ptr to the named output stream. It returns the number of items actually written. SEE ALSO
read(2), write(2), fopen(3S), getc(3S), putc(3S), gets(3S), puts(3S), printf(3S), scanf(3S) DIAGNOSTICS
Fread and fwrite return 0 upon end of file or error. 4th Berkeley Distribution May 15, 1985 FREAD(3S)
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