[Rd] file.info() on file larger than 2GB
Roger D. Peng
rpeng at jhsph.edu
Wed Sep 1 04:05:12 CEST 2004
Indeed, when I tried the same on a 64-bit OS I got the usual
(correct) information from file.info(). The size is wrong in R
1.9.1 but that seems to have been fixed in R-devel.
Prof Brian Ripley wrote:
> This is a purely OS issue: your OS has not been set up so the fopen and
> stat calls handle > 2Gb files. There is one R issue: the size will
> overflow in file.info.
> For example, under Solaris 64-bit applications can handle such files
> whereas 32-bit ones need calls to stat64, fopen64 etc.
> It seems a very exotic need, but if someone wants to find out how to use
> the OS-specific ways to extend stat etc and supply patches, please do so.
> We don't put OS-specific limitations on help pages.
> On Tue, 31 Aug 2004, Roger D. Peng wrote:
>>I've got a file that's approximately 2.2GB and it seems to be foiling
>>file.info(). When I run `stat' from the shell I get
>>zooey:> stat data.csv
>> File: `data.csv'
>> Size: 2271197563 Blocks: 4440280 IO Block: 4096 regular file
>>Device: 342h/834d Inode: 9994308 Links: 1
>>Access: (0644/-rw-r--r--) Uid: ( 500/ rpeng) Gid: ( 500/ rpeng)
>>Access: 2004-08-31 09:50:04.000000000 -0400
>>Modify: 2004-08-26 19:09:42.000000000 -0400
>>Change: 2004-08-31 09:53:29.000000000 -0400
> Take a look at the source code for stat, in coreutils.
>>But, file.info() in R-devel gives me:
>> > file.info("data.csv")
>> size isdir mode mtime ctime atime uid gid uname grname
>>data.csv NA NA <NA> <NA> <NA> <NA> NA NA <NA> <NA>
>>I assume this has something to do with the underlying call to `stat'
>>This alone is not much of a problem but I also can't seem to be able
>>to open a file connection to the same file. For example,
>> > con <- file("data.csv")
>> > open(con, "r")
>>Error in open.connection(con, "r") : unable to open connection
>>In addition: Warning message:
>>cannot open file `data.csv'
>> > file.exists("data.csv")
>>I take it all these things are related.
>>Is it possible to fix this within R? Or should there be a note in the
>> > version
>>system i686, linux-gnu
>>status Under development (unstable)
>>R-devel at stat.math.ethz.ch mailing list
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