add ptp_pin_function and most PTP_ constants

We cannot (apparently) use a type alias for `ptp_pin_function` because
CI is unhappy with that (e.g. https://github.com/rust-lang/libc/actions/runs/11921706273/job/33226419934?pr=4114)

We can always add that type alias later; it's not a breaking change

(backport <rust-lang#4114>)
(cherry picked from commit a2ec642)

libc-test/build.rs

@@ -3968,6 +3968,22 @@ fn test_linux(target: &str) {
             {
                 return true;
             }
+            // FIXME: Requires >= 4.20 kernel headers
+            if name == "PTP_SYS_OFFSET_EXTENDED" {
+                return true;
+            }
+            // FIXME: Requires >= 5.4 kernel headers
+            if name == "PTP_ENABLE_PPS2" 
+                || name == "PTP_EXTTS_REQUEST2"
+                || name == "PTP_PEROUT_REQUEST2"
+                || name == "PTP_PIN_GETFUNC2"
+                || name == "PTP_PIN_SETFUNC2"
+                || name == "PTP_SYS_OFFSET2"
+                || name == "PTP_SYS_OFFSET_PRECISE2"
+                || name == "PTP_SYS_OFFSET_EXTENDED2"
+            {
+                return true;
+            }
             // FIXME: Requires >= 5.4.1 kernel headers
             if name.starts_with("J1939")
                 || name.starts_with("RTEXT_FILTER_")

libc-test/semver/linux.txt

@@ -2252,7 +2252,27 @@ PTHREAD_PRIO_PROTECT
 PTHREAD_PROCESS_PRIVATE
 PTHREAD_PROCESS_SHARED
 PTHREAD_STACK_MIN
+PTP_ENABLE_PPS
+PTP_ENABLE_PPS2
+PTP_EXTTS_REQUEST
+PTP_EXTTS_REQUEST2
 PTP_MAX_SAMPLES
+PTP_PEROUT_REQUEST
+PTP_PEROUT_REQUEST2
+PTP_PF_EXTTS
+PTP_PF_NONE
+PTP_PF_PEROUT
+PTP_PF_PHYSYNC
+PTP_PIN_GETFUNC
+PTP_PIN_GETFUNC2
+PTP_PIN_SETFUNC
+PTP_PIN_SETFUNC2
+PTP_SYS_OFFSET
+PTP_SYS_OFFSET2
+PTP_SYS_OFFSET_EXTENDED
+PTP_SYS_OFFSET_EXTENDED2
+PTP_SYS_OFFSET_PRECISE
+PTP_SYS_OFFSET_PRECISE2
 PTRACE_ATTACH
 PTRACE_CONT
 PTRACE_DETACH

src/unix/linux_like/linux/mod.rs

@@ -4581,6 +4581,36 @@ pub const HWTSTAMP_FILTER_NTP_ALL: ::c_uint = 15;
 // linux/ptp_clock.h
 pub const PTP_MAX_SAMPLES: ::c_uint = 25; // Maximum allowed offset measurement samples.
 
+const PTP_CLK_MAGIC: u32 = b'=' as u32;
+
+// FIXME: needs the ptp_clock_caps struct
+// pub const PTP_CLOCK_GETCAPS: ::c_uint = _IOR::<ptp_clock_caps>(PTP_CLK_MAGIC, 1);
+pub const PTP_EXTTS_REQUEST: ::c_uint = _IOW::<ptp_extts_request>(PTP_CLK_MAGIC, 2);
+pub const PTP_PEROUT_REQUEST: ::c_uint = _IOW::<ptp_perout_request>(PTP_CLK_MAGIC, 3);
+pub const PTP_ENABLE_PPS: ::c_uint = _IOW::<::c_int>(PTP_CLK_MAGIC, 4);
+pub const PTP_SYS_OFFSET: ::c_uint = _IOW::<ptp_sys_offset>(PTP_CLK_MAGIC, 5);
+pub const PTP_PIN_GETFUNC: ::c_uint = _IOWR::<ptp_pin_desc>(PTP_CLK_MAGIC, 6);
+pub const PTP_PIN_SETFUNC: ::c_uint = _IOW::<ptp_pin_desc>(PTP_CLK_MAGIC, 7);
+pub const PTP_SYS_OFFSET_PRECISE: ::c_uint = _IOWR::<ptp_sys_offset_precise>(PTP_CLK_MAGIC, 8);
+pub const PTP_SYS_OFFSET_EXTENDED: ::c_uint = _IOWR::<ptp_sys_offset_extended>(PTP_CLK_MAGIC, 9);
+
+// FIXME: needs the ptp_clock_caps struct
+// pub const PTP_CLOCK_GETCAPS2: ::c_uint = _IOR::<ptp_clock_caps>(PTP_CLK_MAGIC, 10);
+pub const PTP_EXTTS_REQUEST2: ::c_uint = _IOW::<ptp_extts_request>(PTP_CLK_MAGIC, 11);
+pub const PTP_PEROUT_REQUEST2: ::c_uint = _IOW::<ptp_perout_request>(PTP_CLK_MAGIC, 12);
+pub const PTP_ENABLE_PPS2: ::c_uint = _IOW::<::c_int>(PTP_CLK_MAGIC, 13);
+pub const PTP_SYS_OFFSET2: ::c_uint = _IOW::<ptp_sys_offset>(PTP_CLK_MAGIC, 14);
+pub const PTP_PIN_GETFUNC2: ::c_uint = _IOWR::<ptp_pin_desc>(PTP_CLK_MAGIC, 15);
+pub const PTP_PIN_SETFUNC2: ::c_uint = _IOW::<ptp_pin_desc>(PTP_CLK_MAGIC, 16);
+pub const PTP_SYS_OFFSET_PRECISE2: ::c_uint = _IOWR::<ptp_sys_offset_precise>(PTP_CLK_MAGIC, 17);
+pub const PTP_SYS_OFFSET_EXTENDED2: ::c_uint = _IOWR::<ptp_sys_offset_extended>(PTP_CLK_MAGIC, 18);
+
+// enum ptp_pin_function
+pub const PTP_PF_NONE: ::c_uint = 0;
+pub const PTP_PF_EXTTS: ::c_uint = 1;
+pub const PTP_PF_PEROUT: ::c_uint = 2;
+pub const PTP_PF_PHYSYNC: ::c_uint = 3;
+
 // linux/tls.h
 pub const TLS_TX: ::c_int = 1;
 pub const TLS_RX: ::c_int = 2;
@@ -5635,6 +5665,86 @@ pub const SCHED_FLAG_ALL: ::c_int = SCHED_FLAG_RESET_ON_FORK
 pub const EPIOCSPARAMS: ::Ioctl = 0x40088a01;
 pub const EPIOCGPARAMS: ::Ioctl = 0x80088a02;
 
+const _IOC_NRBITS: u32 = 8;
+const _IOC_TYPEBITS: u32 = 8;
+
+// https://github.com/search?q=repo%3Atorvalds%2Flinux+%22%23define+_IOC_NONE%22&type=code
+cfg_if! {
+    if #[cfg(any(
+        any(target_arch = "powerpc", target_arch = "powerpc64"),
+        any(target_arch = "sparc", target_arch = "sparc64"),
+        any(target_arch = "mips", target_arch = "mips64"),
+    ))] {
+        // https://github.com/torvalds/linux/blob/b311c1b497e51a628aa89e7cb954481e5f9dced2/arch/powerpc/include/uapi/asm/ioctl.h
+        // https://github.com/torvalds/linux/blob/b311c1b497e51a628aa89e7cb954481e5f9dced2/arch/sparc/include/uapi/asm/ioctl.h
+        // https://github.com/torvalds/linux/blob/b311c1b497e51a628aa89e7cb954481e5f9dced2/arch/mips/include/uapi/asm/ioctl.h
+
+        const _IOC_SIZEBITS: u32 = 13;
+        const _IOC_DIRBITS: u32 = 3;
+
+        const _IOC_NONE: u32 = 1;
+        const _IOC_READ: u32 = 2;
+        const _IOC_WRITE: u32 = 4;
+    } else {
+        // https://github.com/torvalds/linux/blob/b311c1b497e51a628aa89e7cb954481e5f9dced2/include/uapi/asm-generic/ioctl.h
+
+        const _IOC_SIZEBITS: u32 = 14;
+        const _IOC_DIRBITS: u32 = 2;
+
+        const _IOC_NONE: u32 = 0;
+        const _IOC_WRITE: u32 = 1;
+        const _IOC_READ: u32 = 2;
+    }
+}
+
+const _IOC_NRMASK: u32 = (1 << _IOC_NRBITS) - 1;
+const _IOC_TYPEMASK: u32 = (1 << _IOC_TYPEBITS) - 1;
+const _IOC_SIZEMASK: u32 = (1 << _IOC_SIZEBITS) - 1;
+const _IOC_DIRMASK: u32 = (1 << _IOC_DIRBITS) - 1;
+
+const _IOC_NRSHIFT: u32 = 0;
+const _IOC_TYPESHIFT: u32 = _IOC_NRSHIFT + _IOC_NRBITS;
+const _IOC_SIZESHIFT: u32 = _IOC_TYPESHIFT + _IOC_TYPEBITS;
+const _IOC_DIRSHIFT: u32 = _IOC_SIZESHIFT + _IOC_SIZEBITS;
+
+// adapted from https://github.com/torvalds/linux/blob/8a696a29c6905594e4abf78eaafcb62165ac61f1/rust/kernel/ioctl.rs
+
+/// Build an ioctl number, analogous to the C macro of the same name.
+const fn _IOC(dir: u32, ty: u32, nr: u32, size: usize) -> u32 {
+    // FIXME(ctest) the `garando_syntax` crate (used by ctest2 in the CI test suite)
+    // cannot currently parse these `debug_assert!`s
+    //
+    // debug_assert!(dir <= _IOC_DIRMASK);
+    // debug_assert!(ty <= _IOC_TYPEMASK);
+    // debug_assert!(nr <= _IOC_NRMASK);
+    // debug_assert!(size <= (_IOC_SIZEMASK as usize));
+
+    (dir << _IOC_DIRSHIFT)
+        | (ty << _IOC_TYPESHIFT)
+        | (nr << _IOC_NRSHIFT)
+        | ((size as u32) << _IOC_SIZESHIFT)
+}
+
+/// Build an ioctl number for an argumentless ioctl.
+pub(crate) const fn _IO(ty: u32, nr: u32) -> u32 {
+    _IOC(_IOC_NONE, ty, nr, 0)
+}
+
+/// Build an ioctl number for an read-only ioctl.
+pub(crate) const fn _IOR<T>(ty: u32, nr: u32) -> u32 {
+    _IOC(_IOC_READ, ty, nr, core::mem::size_of::<T>())
+}
+
+/// Build an ioctl number for an write-only ioctl.
+pub(crate) const fn _IOW<T>(ty: u32, nr: u32) -> u32 {
+    _IOC(_IOC_WRITE, ty, nr, core::mem::size_of::<T>())
+}
+
+/// Build an ioctl number for a read-write ioctl.
+pub(crate) const fn _IOWR<T>(ty: u32, nr: u32) -> u32 {
+    _IOC(_IOC_READ | _IOC_WRITE, ty, nr, core::mem::size_of::<T>())
+}
+
 f! {
     pub fn NLA_ALIGN(len: ::c_int) -> ::c_int {
         return ((len) + NLA_ALIGNTO - 1) & !(NLA_ALIGNTO - 1);