Re: maximum limit of files open with O_EXLOCK

[RVP <rvp%SDF.ORG@localhost>]

On Sat, 19 Jun 2021, nia wrote:

> There seems to be a limit somewhere that causes open() to return ENOMEM
> when 1000+ files are opened with O_EXLOCK, this is independent of any
> "open file" limits.

Seems tied to ulimit -n:

/tmp# ulimit -n
1024
/tmp# ./t; rm -f XXX[0-9]*
bleh 1021: Too many open files
/tmp# ulimit -n 512; ./t; rm -f XXX[0-9]*
bleh 509: Too many open files
/tmp# ulimit -n 256; ./t; rm -f XXX[0-9]*
bleh 253: Too many open files
/tmp# ulimit -n 703; ./t; rm -f XXX[0-9]*
bleh 700: Too many open files
/tmp#

Always 3 less than `ulimit -n' on:

NetBSD x202e.localdomain 9.99.82 NetBSD 9.99.82 (GENERIC) #0: Sat May  8 
19:36:28 UTC 2021 
mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64

-RVP