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Query regarding /proc/<pid>/mem


Hi all,
        'man proc' suggests that via the /proc/<pid>/mem entry one can 
access the pages of a process's memory through open, read and fseek.

`strace'ing cat suggests that it uses open, read and fseek syscalls. But
when I do 'cat /proc/<pid>/mem' open works but read fails. Output says
mem: No such process.

I don't get this behavior. Somebody please explain.

Anupam




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