read() wont allow me to read files larger than 2 gig (on a 64bit)


 
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Top Forums UNIX for Advanced & Expert Users read() wont allow me to read files larger than 2 gig (on a 64bit)
# 15  
Old 01-11-2010
For the third time, I'm sure you have. I'm sure they must be working on correcting the problem that prevents two-gig reads, as well; the sticky issue is likely how to manage that on 32-bit systems.

You weren't the OP, though, and my question was what these enormous reads were for in the first place. 9 out of 10 times I see someone sucking an enormous wad of raw data into RAM, they're not doing it for performance reasons -- they just want it all in RAM to get at it without further system calls. An mmap gets them that without decimating the cache and squeezing frequently-used things into swap for no good reason, and avoids this problem entirely.
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read-notepad(1) 					      General Commands Manual						   read-notepad(1)

NAME
read-notepad - Connect to the Palm handheld device and list the record information found in the Notepad application. Alternately, if no options are given, each record's image will be converted to files, using Portable Network Graphic (.png) or Portable Pixmap (.ppm) format. The default type is ppm. SYNOPSIS
read-notepad -p <port> --list --type <type> DESCRIPTION
read-notepad allows a PalmOS 4.0 or later user to read the data stored in the Palm Notepad application and extract the data into images and convert them to Portable Network Graphics (.png) or Portable Pixmap (.ppm) files. OPTIONS -p --port <port> Use device file port to communicate with the Palm handheld device. If this is not specified, will look for the $PILOTPORT environ- ment variable. If both are not found, will fall back to /dev/pilot. -h --help Display help synopsis for read-notepad -v --version Display version of read-notepad -l --list List picture information found on the device instead of converting them to image files -t --type <type> Specify the output picture type. Can be either "png" or "ppm". USAGE
The program will connect to the target Palm handheld device, and list or convert the records and images found in the Palm Notepad applica- tion to Portable Network Graphic (.png) or Portable Pixmap (.ppm) files. KNOWN BUGS
read-notepad has no known bugs. REPORTING BUGS
Report bugs at http://bugs.pilot-link.org/ AUTHOR
read-notepad was written by Angus Ainslie <angusa@deltatee.com>. Free Software Foundation Palm Computing Device Tools read-notepad(1)