Reading /proc/[nnn]/mem only gives ESRCH or EACCES

From: Scott A Crosby (crosby@qwes.math.cmu.edu)
Date: Fri Jul 14 2000 - 01:18:43 EST

I'm interested in looking at the memory of a process (running 'strings' on
it.) I expected that '/proc/[nnn]/mem' would be the logical choice to
give me the process image, but it doesn't let me.

If I run 'cat /proc/1/mem' as root, I get an ESRCH. Ditto trying to read
any other process.

If, instead I run 'cat /proc/self/mem', I get EACCES if I'm root or a
non-root user.

If /proc/[nnn]/mem isn't the way to get this information, and it only
gives errors, what good is it?

This seems true for both:

   Linux version 2.0.38 (root@qwe1) (gcc version 2.7.2.3)
             #2 Thu Aug 26 16:35:52 EDT 1999

AND

   Linux version 2.2.16 (root@wilson) (gcc version 2.95.2 20000313 (Debian
             GNU/Linux)) #18 SMP Mon Jun 12 23:22:31 EDT 2000

Thanks..
Scott 

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