[ErenYeager1836]

What

getdtablesize (NID sZuwaDPATKs, aerolib) is a throwing export. FreeBSD 11.4 makes it system call 89, sys_getdtablesize (sys/kern/kern_descrip.c:338-355): min(lim_cur(RLIMIT_NOFILE), maxfilesperproc). Neither the console's RLIMIT_NOFILE soft limit nor kern.maxfilesperproc is published; getrlimit keeps throwing for RLIMIT_NOFILE for the same reason. Recorded in technical debt.

VLC (PPSA85300) and XPSemu (PPSA97358) import it and call it only from their own closefrom:

void closefrom(int lowfd)
{
    int max = getdtablesize();
    for (int fd = lowfd < 0 ? 0 : lowfd; fd < max; fd++) {
        close(fd);
    }
}

so the value decides how many close calls run. With the export, the unresolved import error is resolved.

Carried from @screamm / David with author attribution preserved.

Tested

• Windows 11: guest_getrlimit test suite passes.
• tools/check_conventions.py passes.
• tools/check_test_registration.py passes.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Unblocks: PPSA85300, PPSA97358
• AI-assisted: no

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
#3870	docs/dev/debt/libkernel.md L165
#4374	core/libs/prx/libkernel/System/src/Process.cpp L541 docs/dev/debt/libkernel.md L165
#4379	docs/dev/debt/libkernel.md L165
#4725	docs/dev/debt/libkernel.md L165
#4796	docs/dev/debt/libkernel.md L165
#4920	docs/dev/debt/libkernel.md L165
#4968	docs/dev/debt/libkernel.md L165
#5061	core/libs/prx/libkernel/System/src/Process.cpp L541 core/libs/tests/GuestGetrlimit.cpp L16, L125	getdtablesize_nid_postfix

[github-actions]

Progress report (c7632f0 → 79fcbf2)

➖ System libraries: 88.44% (+0.0%, +1 implemented functions)

✅ 1 implemented

Library	Name
libkernel	getdtablesize_nid_postfix

⚪ 1 behaviourally empty (constant return or throw)

Library	Name
libkernel	getdtablesize_nid_postfix

[adriadam10]

Closing as a duplicate: #5061 (opened earlier) adds the same getdtablesize export in the same three files (Process.cpp, GuestGetrlimit.cpp, docs/dev/debt/libkernel.md), and CONTRIBUTING asks that no two open PRs implement the same function. This PR also only adds a throwing body, so it resolves the import but gives no behaviour.

Feel free to reopen if #5061 is closed without merging, or if you add a real implementation backed by a measured value.