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From: jik@athena.mit.edu (Jonathan I. Kamens)
Newsgroups: comp.unix.wizards
Subject: Re: What, exactly, are stat.st_blocks, statfs.f_bsize?
Message-ID: <1991Feb26.010146.27490@athena.mit.edu>
Date: 26 Feb 91 01:01:46 GMT
References: <1991Feb25.205932.16587@athena.mit.edu> <10283@dog.ee.lbl.gov>
Sender: news@athena.mit.edu (News system)
Organization: Massachusetts Institute of Technology
Lines: 28


  Well, if there are systems that measure st_blocks in terms of 1k blocks, how
can I detect them in my source code?

  Assuming that it's always 512 bytes would leave me with the following code:

int actual_bytes;
struct stat statbuf;

... assume statbuf is initialized ...

#ifdef ST_BLOCKS_EXISTS
actual_bytes = statbuf.st_blocks * 512;
#else
actual_bytes = statbuf.st_size;
#endif /* ST_BLOCKS_EXISTS */

But this is going to lose on sites that have 1k blocks.  Is there any way to
detect them.

  And, on a historical note, what led to the decision to measure in terms of
512-byte blocks, and why do some sites measure in terms of 1k blocks instead?

-- 
Jonathan Kamens			              USnail:
MIT Project Athena				11 Ashford Terrace
jik@Athena.MIT.EDU				Allston, MA  02134
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