Hi Jan,
Jan Engelhardt wrote:
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?
Maybe it is worth, but I don't know how to make it work. 'dd' does not work
either:
$ dd if=/proc/self/mem of=/dev/zero
dd: error reading '/proc/self/mem': Input/output error
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.003608 s, 0.0 kB/s
In fact, nothing seems to work with /proc/self/mem:
$ cat /proc/self/mem > /dev/zero
cat: /proc/self/mem: Input/output error
$ wc /proc/self/mem
wc: /proc/self/mem: Input/output error
0 0 0 /proc/self/mem
$ file /proc/self/mem
/proc/self/mem: empty
Best regards,
Antonio.
