RustPython
diff --git a/scripts/libc_posix.py b/scripts/libc_posix.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+import collections
+import re
+import urllib.request
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from collections.abc import Iterator
+
+CONSTS_PAT = re.compile(r"\b_*[A-Z]+(?:_+[A-Z]+)*_*\b")
+OS_CONSTS_PAT = re.compile(
+    r"\bos\.(_*[A-Z]+(?:_+[A-Z]+)*_*)"
+)  # TODO: Exclude matches if they have `(` after (those are functions)
+
+
+LIBC_VERSION = "0.2.175"
+
+EXCLUDE = frozenset(
+    {
+        # Defined at `vm/src/stdlib/os.rs`
+        "O_APPEND",
+        "O_CREAT",
+        "O_EXCL",
+        "O_RDONLY",
+        "O_RDWR",
+        "O_TRUNC",
+        "O_WRONLY",
+        "SEEK_CUR",
+        "SEEK_END",
+        "SEEK_SET",
+        # Functions, not consts
+        "WCOREDUMP",
+        "WIFCONTINUED",
+        "WIFSTOPPED",
+        "WIFSIGNALED",
+        "WIFEXITED",
+        "WEXITSTATUS",
+        "WSTOPSIG",
+        "WTERMSIG",
+        # False positive
+        # "EOF",
+    }
+)
+
+EXTRAS = {
+    frozenset({"macos"}): {"COPYFILE_DATA"},
+}
+RENAMES = {"COPYFILE_DATA": "_COPYFILE_DATA"}
+
+
+def build_url(fname: str) -> str:
+    return f"https://raw.githubusercontent.com/rust-lang/libc/refs/tags/{LIBC_VERSION}/libc-test/semver/{fname}.txt"
+
+
+TARGET_OS = {
+    "android": "android",
+    "dragonfly": "dragonfly",
+    "freebsd": "freebsd",
+    "linux": "linux",
+    "macos": "apple",
+    "netbsd": "netbsd",
+    "openbsd": "openbsd",
+    "redox": "redox",
+    # solaris?
+    "unix": "unix",
+}
+
+
+def get_consts(url: str, pattern: re.Pattern = CONSTS_PAT) -> frozenset[str]:
+    with urllib.request.urlopen(url) as f:
+        resp = f.read().decode()
+
+    return frozenset(pattern.findall(resp)) - EXCLUDE
+
+
+def format_groups(groups: dict) -> "Iterator[tuple[str, str]]":
+    # sort by length, then alphabet. so we will have a consistent output
+    for targets, consts in sorted(
+        groups.items(), key=lambda t: (len(t[0]), sorted(t[0]))
+    ):
+        cond = ", ".join(
+            f'target_os = "{target_os}"' if target_os != "unix" else target_os
+            for target_os in sorted(targets)
+        )
+        if len(targets) > 1:
+            cond = f"any({cond})"
+        cfg = f"#[cfg({cond})]"
+
+        imports = ", ".join(
+            const if const not in RENAMES else f"{const} as {RENAMES[const]}"
+            for const in sorted(consts)
+        )
+        use = f"use libc::{{{imports}}};"
+        yield cfg, use
+
+
+def main():
+    wanted_consts = get_consts(
+        "https://docs.python.org/3.13/library/os.html",  # Should we read from https://github.com/python/cpython/blob/bcee1c322115c581da27600f2ae55e5439c027eb/Modules/posixmodule.c#L17023 instead?
+        pattern=OS_CONSTS_PAT,
+    )
+    available = {
+        target_os: get_consts(build_url(fname))
+        for target_os, fname in TARGET_OS.items()
+    }
+
+    group_consts = collections.defaultdict(set)
+    for const in wanted_consts:
+        target_oses = frozenset(
+            target_os for target_os, consts in available.items() if const in consts
+        )
+        if not target_oses:
+            continue
+
+        group_consts[target_oses].add(const)
+    group_consts = {grp: v | EXTRAS.get(grp, set()) for grp, v in group_consts.items()}
+
+    code = "\n\n".join(
+        f"""
+{cfg}
+#[pyattr]
+{use}
+""".strip()
+        for cfg, use in format_groups(group_consts)
+    )
+
+    print(code)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/vm/src/stdlib/posix.rs b/vm/src/stdlib/posix.rs
@@ -47,40 +47,177 @@ pub mod module {
     };
     use strum_macros::{EnumIter, EnumString};
 
+    #[cfg(target_os = "freebsd")]
     #[pyattr]
-    use libc::{PRIO_PGRP, PRIO_PROCESS, PRIO_USER};
+    use libc::{MFD_HUGE_MASK, SF_MNOWAIT, SF_NOCACHE, SF_NODISKIO, SF_SYNC};
+
+    #[cfg(target_os = "linux")]
+    #[pyattr]
+    use libc::PIDFD_NONBLOCK;
+
+    #[cfg(target_os = "macos")]
+    #[pyattr]
+    use libc::{
+        COPYFILE_DATA as _COPYFILE_DATA, O_EVTONLY, O_NOFOLLOW_ANY, PRIO_DARWIN_BG,
+        PRIO_DARWIN_NONUI, PRIO_DARWIN_PROCESS, PRIO_DARWIN_THREAD,
+    };
+
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[pyattr]
+    use libc::{
+        CLONE_FILES, CLONE_FS, CLONE_NEWCGROUP, CLONE_NEWIPC, CLONE_NEWNET, CLONE_NEWNS,
+        CLONE_NEWPID, CLONE_NEWUSER, CLONE_NEWUTS, CLONE_SIGHAND, CLONE_SYSVSEM, CLONE_THREAD,
+        CLONE_VM, EFD_CLOEXEC, EFD_NONBLOCK, EFD_SEMAPHORE, O_NOATIME, O_TMPFILE, P_PIDFD,
+        SCHED_BATCH, SCHED_IDLE, SCHED_RESET_ON_FORK, SPLICE_F_MORE, SPLICE_F_MOVE,
+        SPLICE_F_NONBLOCK,
+    };
+
+    #[cfg(any(target_os = "android", unix))]
+    #[pyattr]
+    use libc::{
+        F_OK, O_CLOEXEC, O_DIRECTORY, O_NOFOLLOW, O_NONBLOCK, PRIO_PGRP, PRIO_PROCESS, PRIO_USER,
+        R_OK, RTLD_GLOBAL, RTLD_LAZY, RTLD_LOCAL, RTLD_NOW, W_OK, WCONTINUED, WNOHANG, WUNTRACED,
+        X_OK,
+    };
+
+    #[cfg(any(target_os = "macos", target_os = "redox"))]
+    #[pyattr]
+    use libc::O_SYMLINK;
+
+    #[cfg(any(target_os = "android", target_os = "freebsd", target_os = "linux"))]
+    #[pyattr]
+    use libc::{
+        MFD_ALLOW_SEALING, MFD_CLOEXEC, MFD_HUGETLB, POSIX_FADV_DONTNEED, POSIX_FADV_NOREUSE,
+        POSIX_FADV_NORMAL, POSIX_FADV_RANDOM, POSIX_FADV_SEQUENTIAL, POSIX_FADV_WILLNEED,
+    };
+
+    #[cfg(any(target_os = "android", target_os = "linux", target_os = "netbsd"))]
+    #[pyattr]
+    use libc::{TFD_CLOEXEC, TFD_NONBLOCK, TFD_TIMER_ABSTIME, TFD_TIMER_CANCEL_ON_SET};
+
-    #[cfg(any(target_os = "android", target_os = "linux", target_os = "netbsd"))]
-    #[pyattr]
-    use libc::{TFD_CLOEXEC, TFD_NONBLOCK, TFD_TIMER_ABSTIME, TFD_TIMER_CANCEL_ON_SET};
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[pyattr]
+    use libc::{TFD_CLOEXEC, TFD_NONBLOCK, TFD_TIMER_ABSTIME, TFD_TIMER_CANCEL_ON_SET};
-    #[cfg(any(target_os = "android", target_os = "linux", target_os = "netbsd"))]
-    #[pyattr]
-    use libc::{TFD_CLOEXEC, TFD_NONBLOCK, TFD_TIMER_ABSTIME, TFD_TIMER_CANCEL_ON_SET};
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[pyattr]
+    use libc::{TFD_CLOEXEC, TFD_NONBLOCK, TFD_TIMER_ABSTIME, TFD_TIMER_CANCEL_ON_SET};
+    #[cfg(any(target_os = "linux", target_os = "macos", target_os = "netbsd"))]
+    #[pyattr]
+    use libc::{XATTR_CREATE, XATTR_REPLACE};
 
     #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "linux",
+        target_os = "netbsd"
+    ))]
+    #[pyattr]
+    use libc::{GRND_NONBLOCK, GRND_RANDOM};
+
+    #[cfg(any(
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "redox"
+    ))]
+    #[pyattr]
+    use libc::O_PATH;
+
-    #[cfg(any(
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "linux",
-        target_os = "redox"
-    ))]
-    #[pyattr]
-    use libc::O_PATH;
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[pyattr]
+    use libc::O_PATH;
-    #[cfg(any(
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "linux",
-        target_os = "redox"
-    ))]
-    #[pyattr]
-    use libc::O_PATH;
+    #[cfg(any(target_os = "android", target_os = "linux"))]
+    #[pyattr]
+    use libc::O_PATH;
+    #[cfg(any(
+        target_os = "android",
+        target_os = "linux",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))]
+    #[pyattr]
+    use libc::O_RSYNC;
+
-    #[cfg(any(
-        target_os = "android",
-        target_os = "linux",
-        target_os = "netbsd",
-        target_os = "openbsd"
-    ))]
-    #[pyattr]
-    use libc::O_RSYNC;
+     #[cfg(target_os = "linux")]
+     #[pyattr]
+     use libc::O_RSYNC;
-    #[cfg(any(
-        target_os = "android",
-        target_os = "linux",
-        target_os = "netbsd",
-        target_os = "openbsd"
-    ))]
-    #[pyattr]
-    use libc::O_RSYNC;
+     #[cfg(target_os = "linux")]
+     #[pyattr]
+     use libc::O_RSYNC;
+    #[cfg(any(
+        target_os = "android",
         target_os = "dragonfly",
         target_os = "freebsd",
         target_os = "linux",
         target_os = "macos"
     ))]
     #[pyattr]
-    use libc::{SEEK_DATA, SEEK_HOLE};
+    use libc::{RTLD_NODELETE, SEEK_DATA, SEEK_HOLE};
 
-    #[cfg(not(any(target_os = "redox", target_os = "freebsd")))]
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "netbsd"
+    ))]
     #[pyattr]
-    use libc::O_DSYNC;
+    use libc::O_DIRECT;
 
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "macos",
+        target_os = "netbsd"
+    ))]
     #[pyattr]
-    use libc::{O_CLOEXEC, O_NONBLOCK, WNOHANG};
+    use libc::RTLD_NOLOAD;
 
-    #[cfg(target_os = "macos")]
+    #[cfg(any(
+        target_os = "android",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))]
     #[pyattr]
-    use libc::{O_EVTONLY, O_FSYNC, O_NOFOLLOW_ANY, O_SYMLINK};
+    use libc::O_DSYNC;
 
-    #[cfg(not(target_os = "redox"))]
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))]
     #[pyattr]
-    use libc::{O_NDELAY, O_NOCTTY};
+    use libc::SCHED_OTHER;
 
+    #[cfg(any(
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox"
+    ))]
     #[pyattr]
-    use libc::{RTLD_GLOBAL, RTLD_LAZY, RTLD_LOCAL, RTLD_NOW};
+    use libc::{O_EXLOCK, O_FSYNC, O_SHLOCK};
 
-    #[cfg(target_os = "linux")]
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd"
+    ))]
     #[pyattr]
-    use libc::{GRND_NONBLOCK, GRND_RANDOM};
+    use libc::{
+        CLD_CONTINUED, CLD_DUMPED, CLD_EXITED, CLD_KILLED, CLD_STOPPED, CLD_TRAPPED, F_LOCK,
+        F_TEST, F_TLOCK, F_ULOCK, O_NDELAY, O_NOCTTY, O_SYNC, P_ALL, P_PGID, P_PID, SCHED_FIFO,
+        SCHED_RR,
+    };
 
+    #[cfg(any(
+        target_os = "android",
+        target_os = "dragonfly",
+        target_os = "freebsd",
+        target_os = "linux",
+        target_os = "macos",
+        target_os = "netbsd",
+        target_os = "openbsd",
+        target_os = "redox"
+    ))]
+    #[pyattr]
+    use libc::{O_ASYNC, WEXITED, WNOWAIT, WSTOPPED};
     #[pyattr]
     const EX_OK: i8 = exitcode::OK as i8;
 
@@ -129,49 +266,6 @@ pub mod module {
     #[pyattr]
     const EX_CONFIG: i8 = exitcode::CONFIG as i8;
 
-    #[cfg(any(
-        target_os = "macos",
-        target_os = "linux",
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "netbsd",
-        target_os = "macos"
-    ))]
-    #[pyattr]
-    const SCHED_RR: i32 = libc::SCHED_RR;
-
-    #[cfg(any(
-        target_os = "macos",
-        target_os = "linux",
-        target_os = "android",
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "netbsd",
-        target_os = "macos"
-    ))]
-    #[pyattr]
-    const SCHED_FIFO: i32 = libc::SCHED_FIFO;
-
-    #[cfg(any(
-        target_os = "macos",
-        target_os = "linux",
-        target_os = "freebsd",
-        target_os = "dragonfly",
-        target_os = "netbsd",
-        target_os = "macos"
-    ))]
-    #[pyattr]
-    const SCHED_OTHER: i32 = libc::SCHED_OTHER;
-
-    #[cfg(any(target_os = "linux", target_os = "android"))]
-    #[pyattr]
-    const SCHED_IDLE: i32 = libc::SCHED_IDLE;
-
-    #[cfg(any(target_os = "linux", target_os = "android"))]
-    #[pyattr]
-    const SCHED_BATCH: i32 = libc::SCHED_BATCH;
-
     #[cfg(any(target_os = "linux", target_os = "freebsd", target_os = "macos"))]
     #[pyattr]
     const POSIX_SPAWN_OPEN: i32 = PosixSpawnFileActionIdentifier::Open as i32;
@@ -184,10 +278,6 @@ pub mod module {
     #[pyattr]
     const POSIX_SPAWN_DUP2: i32 = PosixSpawnFileActionIdentifier::Dup2 as i32;
 
-    #[cfg(target_os = "macos")]
-    #[pyattr]
-    const _COPYFILE_DATA: u32 = 1 << 3;
-
     impl TryFromObject for BorrowedFd<'_> {
         fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
             let fd = i32::try_from_object(vm, obj)?;