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reading /proc/self/mem fails

From: Jan Engelhardt
Subject: reading /proc/self/mem fails
Date: Wed, 1 Mar 2023 13:52:19 +0100 (CET)
User-agent: Alpine 2.25 (LSU 592 2021-09-18)


When using ddrescue to read a section of /proc/self/mem, it appears 
ddrescue uses lseek(SEEK_END) in an attempt to determine the file size. 
With procfs being special, that unfortunately fails.

$ strace -fe lseek ddrescue -f /proc/self/mem /dev/zero -s $[0x4040]
lseek(3, 0, SEEK_END) = -1 EINVAL (Invalid argument)

procfs is known to be... special. What is your opinion, is it worth 
making this work?

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