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1

Historically BSD offered memory-mapped I/O via mmap() and friends, while System V introduced shared memory segments as part of the new IPC package (shmget() and friends). Functionally the difference is that memory-mapped I/O is backed by a file while shared segments are not. Shared segments remain allocated after the creating process exits, which is why ...


2

I think the distinction is between C-standard memory management (malloc, free etc., which descend from Unix v6’s alloc etc.) and memory-mapped I/O, which came to the Unix family through BSD (although it was implemented in SunOS first, apparently, after being documented in 4.2BSD but not implemented there; ultimately the BSD implementation came from Mach). ...


10

On some Unix-style systems (BSDs and macOS), CtrlT sends SIGINFO to the running process. Some commands handle this directly; otherwise, it’s handled by the kernel, and that’s what produces the output you’re seeing. SIGINFO on GNU Linux (Arch Linux) missing has more on the topic.


0

The ACL is needed to set permissions sometimes. I found a related instruction. This document on web contents manual exlains about setting ACL for designated user. https://docs.moodle.org/37/en/Installing_Moodle#Download_and_copy_files_into_place


0

I just answered a similar question and noticed yours in "related" questions sidebar. You might find my answer helpful there: Recommendation for an eBook reader for GNOME.


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