Mercurial > gnulib
view doc/stat-size.texi @ 40190:ef116535bf1a
relocatable-prog: Use $ORIGIN trick on more platforms.
* m4/relocatable.m4 (gl_RELOCATABLE_BODY): Use $ORIGIN trick also on
FreeBSD >= 7.3, DragonFly >= 3.0, NetBSD >= 8.0, OpenBSD >= 5.4,
Solaris >= 10, Haiku. But don't use it on Android.
* build-aux/reloc-ldflags: Allow the use of the $ORIGIN trick also on
Hurd, FreeBSD, DragonFly, NetBSD, OpenBSD, Solaris, Haiku.
author | Bruno Haible <bruno@clisp.org> |
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date | Wed, 20 Feb 2019 02:39:52 +0100 |
parents | 16c748720b01 |
children |
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@node stat-size @section stat-size The @code{stat-size} module provides a small number of macros intended for interpreting the file size information in an instance of @code{struct stat}. @c We deliberately don't document DEV_BSIZE (it looks to James @c Youngman as if the ST_NBLOCKSIZE macro should be used instead). @findex ST_NBLOCKS @findex ST_NBLOCKSIZE @cindex block size On POSIX systems, the @code{st_blocks} member of @code{struct stat} contains the number of disk blocks occupied by a file. The @code{ST_NBLOCKS} macro is used to estimate this quantity on systems which don't actually have @code{st_blocks}. Each of these blocks contains @code{ST_NBLOCKSIZE} bytes. @findex ST_BLKSIZE The value of @code{ST_NBLOCKSIZE} is often quite small, small enough that performing I/O in chunks that size would be inefficient. @code{ST_BLKSIZE} is the I/O block size recommended for I/O to this file. This is not guaranteed to give optimum performance, but it should be reasonably efficient.