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Full Discussion: mprotect fails with ENOMEM in text segment
Operating Systems AIX mprotect fails with ENOMEM in text segment Post 302520011 by manolo123 on Thursday 5th of May 2011 03:21:01 PM
Old 05-05-2011
Thank you for a quick reply.

Quote:
That is still an unsigned int pointer type, implying you are assigning only 32 bits.
I don't think that's the problem since the routine works well when performed on non-text segment (for example on page which contains area acquired via malloc).

Quote:
IBM says some pages are not mprotect friendly this way: pSeries and AIX Information Center You might need that env variable.
I have these in my ~/.profile:
Code:
MPROTECT_TXT=ON
XPG_SUS_ENV=ON

Is this enough for these env vars to be 'seen'? I tried different values of those, no effect.

Quote:
I am familiar with self-modifying code from machine language, what do you want it to do?
I am trying to write code to reload the program text from the original executable file in case an error occurs (e.g. a hardware error which scrambled some memory). Is there another way of doing it, instead of mprotect/memset ?
 

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LEARN ABOUT OSX

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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