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Full Discussion: Change value for POSIX
Top Forums UNIX for Advanced & Expert Users Change value for POSIX Post 303002687 by Don Cragun on Wednesday 30th of August 2017 03:28:46 PM
Old 08-30-2017
You come up with a convincing argument explaining why no system conforming to the standard should be allowed to have an ARG_MAX limit less than 1048576, you come up with a convincing argument explaining why small memory model applications should not be allowed to run on standards-conforming systems on hardware using x86 compatible CPU architectures, you come up with convincing arguments why any other systems and features affected by your changes on those systems that currently conform to the standards should not be allowed to still be considered standard-conforming when a revision of the standard is approved that includes your desired changes, and then you file a change request for the standard at the POSIX Standards bug reporting site asking for the _POSIX_ARG_MAX limit in <limits.h> in the Base Definitions and Headers category to be changed whatever limit you think you can get the member companies of the Open Group's Base Working Group who will vote on the next revision of the Single UNIX Specification, the member countries of ISO who will vote on the next revision of ISO 9945 Standard, AND the individual members of the IEEE Standards Association who will vote on the next revision of the IEEE 1003.1 Standard will all approve.

The next revision of these three linked standards is expected to be approved sometime around 2020 or 2021. Then you will need to wait for companies who build operating systems to release updates that conform to the new standard and you will need to use one of those conforming products. Other operating systems might or might not increase the _POSIX_ARG_MAX limit even though they do not conform to other requirements of that standard. (Note that no Linux distribution has yet claimed to conform to any version of the POSIX standards.)
 

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LEARN ABOUT V7

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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