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Bash's ulimit concerns about limits on different kinds of resources.

Is it correct a limit shown or set by ulimit is per-resource?

Is each such limit the sum of the resources available to all the processes, instead of the limit of the resource available to each process?

Or are some limits per-resource, and some limits per-resource and per-process? How can we tell which is which case?

Related http://forums.devshed.com/programming-42/whats-difference-sysconf-rlimit-955656.html Thanks.

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As you can read in the man page:

http://schillix.sourceforge.net/man/man2/getrlimit.2.html

or

http://pubs.opengroup.org/onlinepubs/9699919799/functions/setrlimit.html

these limits are per process

  • In more comprehensive user manuals from other operating systems one can read that only some of them are per process. (-: – JdeBP May 29 '18 at 7:53
  • The official limits are per process. I mentioned Solaris and POSIX ad this is from the inventor (BSD) and from the standard. If there is a specific operating system that added nonstandard resources, this may be different, but it seems that you don't know such a limit either. – schily May 29 '18 at 10:11
  • @schily “The maximum number of processes available to a single user” is obviously not per-process. – Stephen Kitt May 29 '18 at 14:41
  • This is a Linux extension and was neither in the BSD original implementation, nor is it in the POSIX standard. – schily May 29 '18 at 14:58
  • RLIMIT_NPROC (which isn't even the only one that is not per-process) has been in the BSDs for approaching a quarter of a century at this point, starting with 4.4BSD. It's definitely time to catch up with those manual pages that I mentioned. (-: – JdeBP May 30 '18 at 14:45

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