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Full Discussion: attach message at runtime
Top Forums Programming attach message at runtime Post 302653317 by chercheur857 on Friday 8th of June 2012 04:15:07 PM
Old 06-08-2012
Quote:
Why can't you just modify your original program to send headers?
i have juste the executable so i can't modify my original program

Quote:
But, if it's not your program, how do you know it calls send() once for per data item? What if it packs ten into one send()? Then you'll have to actually process the data yourself in your fake send() call, inserting 10 headers.
i'd like to use for example a library linked to my program , if there is a send or a receive it will redirect it and attach the couple

i want to do like that (i found it in a research)
Quote:
Therefore, we have developed a library which is dynamically loaded by each job using the library interposition mechanism available on Linux
systems during job submission. This mechanism works by initializing the LD PRELOAD environment variable with the desired shared library. Once submitted, all the job are dynamically linked against this library, and all communication-related system calls are redirected. In the used library we
currently redirect all the send() and receive() requests in
order to attach/extract the couple transparently and save it .
 

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LEARN ABOUT REDHAT

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)
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