src/lib/libc, branch main

fts: fix fts_accpath regression after fts_children()

2026-08-06T22:51:25Z

When fts_children() is called, sp->fts_child is set. On the next fts_read() call, fts_safe_changedir() was incorrectly passed p->fts_dirfd (pointing to the parent directory) instead of -1. This caused fts to fchdir to the parent instead of the child directory, silently skipping the contents of 3rd-level subdirectories. This was observed as a failure in nmtree_test:mtree_create which calls fts_children() internally. Add regression test accpath_correct_after_descent that calls fts_children() on each directory entry and verifies files at depth 3 are still visited correctly. The test fails with the unfixed libc and passes with the fix. Reported by: Herbert J. Skuhra Sponsored by: Google LLC (GSoC 2026) Reviewed by: asomers Fixes: 4bd01d6ae01 ("fts: refactor to use fd-relative") Pull Request: https://github.com/freebsd/freebsd-src/pull/2354

kern/tty.c: Exterrorize returns

2026-08-05T14:46:45Z

Approved by: kib Pull Request: https://github.com/freebsd/freebsd-src/pull/2349

manuals: Fix more Fx and nearby mechanical typos

2026-08-04T14:04:23Z

Fix compiler warnings related to the Fx macro, as well as all other mechanical typos that were visible within one screenful of them. These cause rendering glitches on various toolchains with various of the five and a half decades of rich output formats and tooling manpages scale to. The *x macro set specifies operating systems. These macros take the rest of the line as an argument. Sometimes, a space was not used to separate the argument of Fx and the trailing period. Others had other parts of the sentence supplied as an argument to Fx. While here, fix the other mechanical typos visible on those specific screenfulls. Correct section typo AUTHOR to AUTHORS, markup utilities with Sy, and apply line break after the end of a sentence. PR: 297248 MFC after: 3 days Reported by: wosch (are you sure that's all of the broken Fx'es?) Fixes: ff2bc641599a ("Fix Fx and nearby mechanical typos") Fixes: d790b16bbf0c ("add man pages for stdbit functions") Fixes: 6c57e368eb17 ("implement C23 memalignment()") Fixes: b06338167d64 ("ROUTE_MPATH and FIB_ALGO") Fixes: 7e1affa242ca ("revise divert-to and divert-reply")

manuals: Fix Fx and nearby mechanical typos

2026-08-04T00:32:36Z

Fix compiler warnings related to the Fx macro, as well as all other mechanical typos that were visible within one screenful of them. These cause rendering glitches on various toolchains with various of the five and a half decades of rich output formats and tooling manpages scale to. The *x macro set specifies operating systems. These macros take the rest of the line as an argument. Sometimes, a space was not used to separate the argument of Fx and the trailing period. Another, FreeBSD Foundation was misrepresented as an operating system version instead of an author. Two more had other parts of the sentence supplied as an argument to Fx. While I had those open, fix the other mechancial typos visible on those specific screenfulls. Fix a list width glitch, correct section typo AUTHOR to AUTHORS, and switch AUTHORS sections containing prose to prose-mode so that they wrap freely when rendered. PR: 297248 MFC after: 3 days Fixes: d39e310c7d6a ("man/man3: add stdbit.3") Fixes: d790b16bbf0c ("add man pages for stdbit functions") Fixes: b61850c4e6f6 ("net.link.bridge.member_ifaddrs to false") Reported by: wosch (groff is complaining about incorrect Fx usage)

uexterr_gettext(3): support dynamic kernel categories

2026-08-03T21:43:23Z

Add an uncached sysctl based implementation which retrieves individual categories. A cache would be an obvious extension should this optional feature that can only be enabled by an environmental varible have a noticable performance impact in a case that matters. Reviewed by: kib Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D58238

exterror(9): split category into multiple sources

2026-08-03T21:43:22Z

The static, global index into an array of strings is simple, cheap, and works for the base kernel, but is unworkable for (potentially third-party) kernel modules or for arbitrary userspace code. Swipe a few of the top bits of category to indicate a source with all-zeros being the current model (EXTERR_CAT_SRC_KERN_STATIC). Add two additional sources EXTERR_CAT_SRC_KERN_DYNAMIC and EXTERR_CAT_SRC_USER with stub implementations. Reviewed by: kib Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D58236

fts: refactor to use fd-relative operations internally

2026-08-03T19:12:28Z

Replace all _open() calls with _openat() in __fts_open(), fts_read(), and fts_children(). Replace statfs() with _fstatfs(). Add fts_dirfd to struct _ftsent, set to the file descriptor of the parent directory. Callers can use openat(ent->fts_dirfd, ent->fts_name, ...) to access files safely without relying on fts_accpath, which enables programs in capability mode to open the files described by _ftsent. This is a preparatory change for fts_openat() which will allow callers to provide a pre-opened directory fd, enabling fts(3) traversal inside Capsicum capability mode. Mirror all fts_open() changes to fts_open_b(). As a result of expanding _ftsend, publish new ELF symbol versions for fts_openat and related functions. Sponsored by: Google LLC (GSoC 2026) Reviewed by: asomers Pull Request: https://github.com/freebsd/freebsd-src/pull/2303

libc: getopt{,_long}: Const correctness for C23

2026-08-03T14:02:51Z

On some platforms, e.g. Linux Clang 22.1.8 / glibc 2.43, strchr() now implements the C23 behaviour where passing a const pointer to strchr() also returns a const pointer. This breaks getopt during the bootstrap build, since it assumes the return value is always a mutable pointer. Since the pointed-to value is never modified, fix this by making the pointer const. MFC after: 1 week Reviewed by: emaste Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D58488

libc: Add strfromd, strfromf, and strfroml per C23

2026-08-02T12:10:02Z

strfromd(), strfromf(), and strfroml() are implemented directly in terms of gdtoa. If a non-conforming format string is passed, the string "EDOOFUS" is returned and errno set to EDOOFUS as an extension. Reviewed by: fuz MFC after: 1 month Pull-Request: https://github.com/freebsd/freebsd-src/pull/2301 Signed-off-by: Faraz Vahedi

libc/merge.c: use memcpy() for copying

2026-08-02T11:17:45Z

Currently mergesort() uses ICOPY_*() to copy data as four byte blocks instead of one byte. However, this is only achievable when both size and base arguments are aligned to four bytes. Use of memcpy() is ideal as 1) it is cleaner and 2) the library will use SIMD for copying when the hardware supports it. Compared to ICOPY_*(), SIMD can support up to 64 bytes. When the SIMD-backed memcpy() find the address is unaligned, it can first copy data up to the nearest aligned address, and then use SIMD operations for faster transfer. Thus memcpy() can give better performance than mergesort()'s own implementation. This is benchmarked on amd64 where there isn't a SIMD-backed implementation yet. However, the baseline implementation in assembly already delivers better performance in unaligned cases although there is some performance drops in aligned cases. The benchmark results and script is available in the Phabricator review. Ideally, more performance improvements will come when amd64 gets SIMD implementation of memcpy(). Signed-off-by: Minsoo Choo Reviewed by: fuz MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D58002