In reply to @artturin:matrix.org
It did not work before https://github.com/NixOS/nix/pull/6645 as shown by issue https://github.com/NixOS/nix/issues/6557

In reply to @emilazy:matrix.org
you definitely can't go above kern.maxfilesperproc so my expectation is that it's either doing nothing or getting silently capped

seems like it gets capped based on

include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>


int main(void)
{
    int count = 3;
    while (open("/dev/null", O_RDONLY) != -1) {
        count++;
    }
    printf("%s: %d\n", strerror(errno), count);
    return 0;
}

In reply to @paparodeo:matrix.org

seems like it gets capped based on

include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>


int main(void)
{
    int count = 3;
    while (open("/dev/null", O_RDONLY) != -1) {
        count++;
    }
    printf("%s: %d\n", strerror(errno), count);
    return 0;
}

In reply to @emilazy:matrix.org
you definitely can't go above kern.maxfilesperproc so my expectation is that it's either doing nothing or getting silently capped

seems like it gets capped based on

#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>


int main(void)
{
    int count = 3;
    while (open("/dev/null", O_RDONLY) != -1) {
        count++;
    }
    printf("%s: %d\n", strerror(errno), count);
    return 0;
}

In reply to @emilazy:matrix.org
with a launchd daemon?

emily@yuyuko ~> nix build --impure --expr 'with (builtins.getFlake "nixpkgs").legacyPackages.x86_64-darwin; runCommand "x" {} "ulimit -a > $out"' -L
emily@yuyuko ~> cat result
core file size              (blocks, -c) 0
data seg size               (kbytes, -d) unlimited
file size                   (blocks, -f) unlimited
max locked memory           (kbytes, -l) unlimited
max memory size             (kbytes, -m) unlimited
open files                          (-n) 1048576
pipe size                (512 bytes, -p) 1
stack size                  (kbytes, -s) 8192
cpu time                   (seconds, -t) unlimited
max user processes                  (-u) 5568
virtual memory              (kbytes, -v) unlimited