pub type pthread_t = c_ulong;
pub type __priority_which_t = ::c_uint;
pub type __rlimit_resource_t = ::c_uint;
pub type Lmid_t = ::c_long;
pub type regoff_t = ::c_int;
pub type __kernel_rwf_t = ::c_int;

cfg_if! {
    if #[cfg(doc)] {
        // Used in `linux::arch` to define ioctl constants.
        pub(crate) type Ioctl = ::c_ulong;
    } else {
        #[doc(hidden)]
        pub type Ioctl = ::c_ulong;
    }
}

s! {
    pub struct statx {
        pub stx_mask: u32,
        pub stx_blksize: u32,
        pub stx_attributes: u64,
        pub stx_nlink: u32,
        pub stx_uid: u32,
        pub stx_gid: u32,
        pub stx_mode: u16,
        __statx_pad1: [u16; 1],
        pub stx_ino: u64,
        pub stx_size: u64,
        pub stx_blocks: u64,
        pub stx_attributes_mask: u64,
        pub stx_atime: ::statx_timestamp,
        pub stx_btime: ::statx_timestamp,
        pub stx_ctime: ::statx_timestamp,
        pub stx_mtime: ::statx_timestamp,
        pub stx_rdev_major: u32,
        pub stx_rdev_minor: u32,
        pub stx_dev_major: u32,
        pub stx_dev_minor: u32,
        pub stx_mnt_id: u64,
        pub stx_dio_mem_align: u32,
        pub stx_dio_offset_align: u32,
        __statx_pad3: [u64; 12],
    }

    pub struct statx_timestamp {
        pub tv_sec: i64,
        pub tv_nsec: u32,
        pub __statx_timestamp_pad1: [i32; 1],
    }

    pub struct aiocb {
        pub aio_fildes: ::c_int,
        pub aio_lio_opcode: ::c_int,
        pub aio_reqprio: ::c_int,
        pub aio_buf: *mut ::c_void,
        pub aio_nbytes: ::size_t,
        pub aio_sigevent: ::sigevent,
        __next_prio: *mut aiocb,
        __abs_prio: ::c_int,
        __policy: ::c_int,
        __error_code: ::c_int,
        __return_value: ::ssize_t,
        pub aio_offset: off_t,
        #[cfg(all(not(target_arch = "x86_64"), target_pointer_width = "32"))]
        __unused1: [::c_char; 4],
        __glibc_reserved: [::c_char; 32]
    }

    pub struct __exit_status {
        pub e_termination: ::c_short,
        pub e_exit: ::c_short,
    }

    pub struct __timeval {
        pub tv_sec: i32,
        pub tv_usec: i32,
    }

    pub struct glob64_t {
        pub gl_pathc: ::size_t,
        pub gl_pathv: *mut *mut ::c_char,
        pub gl_offs: ::size_t,
        pub gl_flags: ::c_int,

        __unused1: *mut ::c_void,
        __unused2: *mut ::c_void,
        __unused3: *mut ::c_void,
        __unused4: *mut ::c_void,
        __unused5: *mut ::c_void,
    }

    pub struct msghdr {
        pub msg_name: *mut ::c_void,
        pub msg_namelen: ::socklen_t,
        pub msg_iov: *mut ::iovec,
        pub msg_iovlen: ::size_t,
        pub msg_control: *mut ::c_void,
        pub msg_controllen: ::size_t,
        pub msg_flags: ::c_int,
    }

    pub struct cmsghdr {
        pub cmsg_len: ::size_t,
        pub cmsg_level: ::c_int,
        pub cmsg_type: ::c_int,
    }

    pub struct termios {
        pub c_iflag: ::tcflag_t,
        pub c_oflag: ::tcflag_t,
        pub c_cflag: ::tcflag_t,
        pub c_lflag: ::tcflag_t,
        pub c_line: ::cc_t,
        pub c_cc: [::cc_t; ::NCCS],
        #[cfg(not(any(
            target_arch = "sparc",
            target_arch = "sparc64",
            target_arch = "mips",
            target_arch = "mips32r6",
            target_arch = "mips64",
            target_arch = "mips64r6")))]
        pub c_ispeed: ::speed_t,
        #[cfg(not(any(
            target_arch = "sparc",
            target_arch = "sparc64",
            target_arch = "mips",
            target_arch = "mips32r6",
            target_arch = "mips64",
            target_arch = "mips64r6")))]
        pub c_ospeed: ::speed_t,
    }

    pub struct mallinfo {
        pub arena: ::c_int,
        pub ordblks: ::c_int,
        pub smblks: ::c_int,
        pub hblks: ::c_int,
        pub hblkhd: ::c_int,
        pub usmblks: ::c_int,
        pub fsmblks: ::c_int,
        pub uordblks: ::c_int,
        pub fordblks: ::c_int,
        pub keepcost: ::c_int,
    }

    pub struct mallinfo2 {
        pub arena: ::size_t,
        pub ordblks: ::size_t,
        pub smblks: ::size_t,
        pub hblks: ::size_t,
        pub hblkhd: ::size_t,
        pub usmblks: ::size_t,
        pub fsmblks: ::size_t,
        pub uordblks: ::size_t,
        pub fordblks: ::size_t,
        pub keepcost: ::size_t,
    }

    pub struct nl_pktinfo {
        pub group: u32,
    }

    pub struct nl_mmap_req {
        pub nm_block_size: ::c_uint,
        pub nm_block_nr: ::c_uint,
        pub nm_frame_size: ::c_uint,
        pub nm_frame_nr: ::c_uint,
    }

    pub struct nl_mmap_hdr {
        pub nm_status: ::c_uint,
        pub nm_len: ::c_uint,
        pub nm_group: u32,
        pub nm_pid: u32,
        pub nm_uid: u32,
        pub nm_gid: u32,
    }

    pub struct rtentry {
        pub rt_pad1: ::c_ulong,
        pub rt_dst: ::sockaddr,
        pub rt_gateway: ::sockaddr,
        pub rt_genmask: ::sockaddr,
        pub rt_flags: ::c_ushort,
        pub rt_pad2: ::c_short,
        pub rt_pad3: ::c_ulong,
        pub rt_tos: ::c_uchar,
        pub rt_class: ::c_uchar,
        #[cfg(target_pointer_width = "64")]
        pub rt_pad4: [::c_short; 3usize],
        #[cfg(not(target_pointer_width = "64"))]
        pub rt_pad4: ::c_short,
        pub rt_metric: ::c_short,
        pub rt_dev: *mut ::c_char,
        pub rt_mtu: ::c_ulong,
        pub rt_window: ::c_ulong,
        pub rt_irtt: ::c_ushort,
    }

    pub struct timex {
        pub modes: ::c_uint,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub offset: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub offset: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub freq: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub freq: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub maxerror: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub maxerror: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub esterror: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub esterror: ::c_long,
        pub status: ::c_int,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub constant: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub constant: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub precision: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub precision: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub tolerance: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub tolerance: ::c_long,
        pub time: ::timeval,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub tick: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub tick: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub ppsfreq: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub ppsfreq: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub jitter: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub jitter: ::c_long,
        pub shift: ::c_int,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub stabil: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub stabil: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub jitcnt: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub jitcnt: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub calcnt: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub calcnt: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub errcnt: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub errcnt: ::c_long,
        #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
        pub stbcnt: i64,
        #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
        pub stbcnt: ::c_long,
        pub tai: ::c_int,
        pub __unused1: i32,
        pub __unused2: i32,
        pub __unused3: i32,
        pub __unused4: i32,
        pub __unused5: i32,
        pub __unused6: i32,
        pub __unused7: i32,
        pub __unused8: i32,
        pub __unused9: i32,
        pub __unused10: i32,
        pub __unused11: i32,
    }

    pub struct ntptimeval {
        pub time: ::timeval,
        pub maxerror: ::c_long,
        pub esterror: ::c_long,
        pub tai: ::c_long,
        pub __glibc_reserved1: ::c_long,
        pub __glibc_reserved2: ::c_long,
        pub __glibc_reserved3: ::c_long,
        pub __glibc_reserved4: ::c_long,
    }

    pub struct regex_t {
        __buffer: *mut ::c_void,
        __allocated: ::size_t,
        __used: ::size_t,
        __syntax: ::c_ulong,
        __fastmap: *mut ::c_char,
        __translate: *mut ::c_char,
        __re_nsub: ::size_t,
        __bitfield: u8,
    }

    pub struct Elf64_Chdr {
        pub ch_type: ::Elf64_Word,
        pub ch_reserved: ::Elf64_Word,
        pub ch_size: ::Elf64_Xword,
        pub ch_addralign: ::Elf64_Xword,
    }

    pub struct Elf32_Chdr {
        pub ch_type: ::Elf32_Word,
        pub ch_size: ::Elf32_Word,
        pub ch_addralign: ::Elf32_Word,
    }

    pub struct seminfo {
        pub semmap: ::c_int,
        pub semmni: ::c_int,
        pub semmns: ::c_int,
        pub semmnu: ::c_int,
        pub semmsl: ::c_int,
        pub semopm: ::c_int,
        pub semume: ::c_int,
        pub semusz: ::c_int,
        pub semvmx: ::c_int,
        pub semaem: ::c_int,
    }

    pub struct ptrace_peeksiginfo_args {
        pub off: ::__u64,
        pub flags: ::__u32,
        pub nr: ::__s32,
    }

    pub struct __c_anonymous_ptrace_syscall_info_entry {
        pub nr: ::__u64,
        pub args: [::__u64; 6],
    }

    pub struct __c_anonymous_ptrace_syscall_info_exit {
        pub sval: ::__s64,
        pub is_error: ::__u8,
    }

    pub struct __c_anonymous_ptrace_syscall_info_seccomp {
        pub nr: ::__u64,
        pub args: [::__u64; 6],
        pub ret_data: ::__u32,
    }

    pub struct ptrace_syscall_info {
        pub op: ::__u8,
        pub pad: [::__u8; 3],
        pub arch: ::__u32,
        pub instruction_pointer: ::__u64,
        pub stack_pointer: ::__u64,
        #[cfg(libc_union)]
        pub u: __c_anonymous_ptrace_syscall_info_data,
    }

    // linux/if_xdp.h

    pub struct sockaddr_xdp {
        pub sxdp_family: ::__u16,
        pub sxdp_flags: ::__u16,
        pub sxdp_ifindex: ::__u32,
        pub sxdp_queue_id: ::__u32,
        pub sxdp_shared_umem_fd: ::__u32,
    }

    pub struct xdp_ring_offset {
        pub producer: ::__u64,
        pub consumer: ::__u64,
        pub desc: ::__u64,
        pub flags: ::__u64,
    }

    pub struct xdp_mmap_offsets {
        pub rx: xdp_ring_offset,
        pub tx: xdp_ring_offset,
        pub fr: xdp_ring_offset,
        pub cr: xdp_ring_offset,
    }

    pub struct xdp_ring_offset_v1 {
        pub producer: ::__u64,
        pub consumer: ::__u64,
        pub desc: ::__u64,
    }

    pub struct xdp_mmap_offsets_v1 {
        pub rx: xdp_ring_offset_v1,
        pub tx: xdp_ring_offset_v1,
        pub fr: xdp_ring_offset_v1,
        pub cr: xdp_ring_offset_v1,
    }

    pub struct xdp_umem_reg {
        pub addr: ::__u64,
        pub len: ::__u64,
        pub chunk_size: ::__u32,
        pub headroom: ::__u32,
        pub flags: ::__u32,
    }

    pub struct xdp_umem_reg_v1 {
        pub addr: ::__u64,
        pub len: ::__u64,
        pub chunk_size: ::__u32,
        pub headroom: ::__u32,
    }

    pub struct xdp_statistics {
        pub rx_dropped: ::__u64,
        pub rx_invalid_descs: ::__u64,
        pub tx_invalid_descs: ::__u64,
        pub rx_ring_full: ::__u64,
        pub rx_fill_ring_empty_descs: ::__u64,
        pub tx_ring_empty_descs: ::__u64,
    }

    pub struct xdp_statistics_v1 {
        pub rx_dropped: ::__u64,
        pub rx_invalid_descs: ::__u64,
        pub tx_invalid_descs: ::__u64,
    }

    pub struct xdp_options {
        pub flags: ::__u32,
    }

    pub struct xdp_desc {
        pub addr: ::__u64,
        pub len: ::__u32,
        pub options: ::__u32,
    }

    pub struct iocb {
        pub aio_data: ::__u64,
        #[cfg(target_endian = "little")]
        pub aio_key: ::__u32,
        #[cfg(target_endian = "little")]
        pub aio_rw_flags: ::__kernel_rwf_t,
        #[cfg(target_endian = "big")]
        pub aio_rw_flags: ::__kernel_rwf_t,
        #[cfg(target_endian = "big")]
        pub aio_key: ::__u32,
        pub aio_lio_opcode: ::__u16,
        pub aio_reqprio: ::__s16,
        pub aio_fildes: ::__u32,
        pub aio_buf: ::__u64,
        pub aio_nbytes: ::__u64,
        pub aio_offset: ::__s64,
        aio_reserved2: ::__u64,
        pub aio_flags: ::__u32,
        pub aio_resfd: ::__u32,
    }
}

impl siginfo_t {
    pub unsafe fn si_addr(&self) -> *mut ::c_void {
        #[repr(C)]
        struct siginfo_sigfault {
            _si_signo: ::c_int,
            _si_errno: ::c_int,
            _si_code: ::c_int,
            si_addr: *mut ::c_void,
        }
        (*(self as *const siginfo_t as *const siginfo_sigfault)).si_addr
    }

    pub unsafe fn si_value(&self) -> ::sigval {
        #[repr(C)]
        struct siginfo_timer {
            _si_signo: ::c_int,
            _si_errno: ::c_int,
            _si_code: ::c_int,
            _si_tid: ::c_int,
            _si_overrun: ::c_int,
            si_sigval: ::sigval,
        }
        (*(self as *const siginfo_t as *const siginfo_timer)).si_sigval
    }
}

cfg_if! {
    if #[cfg(libc_union)] {
        // Internal, for casts to access union fields
        #[repr(C)]
        struct sifields_sigchld {
            si_pid: ::pid_t,
            si_uid: ::uid_t,
            si_status: ::c_int,
            si_utime: ::c_long,
            si_stime: ::c_long,
        }
        impl ::Copy for sifields_sigchld {}
        impl ::Clone for sifields_sigchld {
            fn clone(&self) -> sifields_sigchld {
                *self
            }
        }

        // Internal, for casts to access union fields
        #[repr(C)]
        union sifields {
            _align_pointer: *mut ::c_void,
            sigchld: sifields_sigchld,
        }

        // Internal, for casts to access union fields. Note that some variants
        // of sifields start with a pointer, which makes the alignment of
        // sifields vary on 32-bit and 64-bit architectures.
        #[repr(C)]
        struct siginfo_f {
            _siginfo_base: [::c_int; 3],
            sifields: sifields,
        }

        impl siginfo_t {
            unsafe fn sifields(&self) -> &sifields {
                &(*(self as *const siginfo_t as *const siginfo_f)).sifields
            }

            pub unsafe fn si_pid(&self) -> ::pid_t {
                self.sifields().sigchld.si_pid
            }

            pub unsafe fn si_uid(&self) -> ::uid_t {
                self.sifields().sigchld.si_uid
            }

            pub unsafe fn si_status(&self) -> ::c_int {
                self.sifields().sigchld.si_status
            }

            pub unsafe fn si_utime(&self) -> ::c_long {
                self.sifields().sigchld.si_utime
            }

            pub unsafe fn si_stime(&self) -> ::c_long {
                self.sifields().sigchld.si_stime
            }
        }

        pub union __c_anonymous_ptrace_syscall_info_data {
            pub entry: __c_anonymous_ptrace_syscall_info_entry,
            pub exit: __c_anonymous_ptrace_syscall_info_exit,
            pub seccomp: __c_anonymous_ptrace_syscall_info_seccomp,
        }
        impl ::Copy for __c_anonymous_ptrace_syscall_info_data {}
        impl ::Clone for __c_anonymous_ptrace_syscall_info_data {
            fn clone(&self) -> __c_anonymous_ptrace_syscall_info_data {
                *self
            }
        }
    }
}

s_no_extra_traits! {
    pub struct utmpx {
        pub ut_type: ::c_short,
        pub ut_pid: ::pid_t,
        pub ut_line: [::c_char; __UT_LINESIZE],
        pub ut_id: [::c_char; 4],

        pub ut_user: [::c_char; __UT_NAMESIZE],
        pub ut_host: [::c_char; __UT_HOSTSIZE],
        pub ut_exit: __exit_status,

        #[cfg(any(target_arch = "aarch64",
                  target_arch = "s390x",
                  target_arch = "loongarch64",
                  all(target_pointer_width = "32",
                      not(target_arch = "x86_64"))))]
        pub ut_session: ::c_long,
        #[cfg(any(target_arch = "aarch64",
                  target_arch = "s390x",
                  target_arch = "loongarch64",
                  all(target_pointer_width = "32",
                      not(target_arch = "x86_64"))))]
        pub ut_tv: ::timeval,

        #[cfg(not(any(target_arch = "aarch64",
                      target_arch = "s390x",
                      target_arch = "loongarch64",
                      all(target_pointer_width = "32",
                          not(target_arch = "x86_64")))))]
        pub ut_session: i32,
        #[cfg(not(any(target_arch = "aarch64",
                      target_arch = "s390x",
                      target_arch = "loongarch64",
                      all(target_pointer_width = "32",
                          not(target_arch = "x86_64")))))]
        pub ut_tv: __timeval,

        pub ut_addr_v6: [i32; 4],
        __glibc_reserved: [::c_char; 20],
    }
}

cfg_if! {
    if #[cfg(feature = "extra_traits")] {
        impl PartialEq for utmpx {
            fn eq(&self, other: &utmpx) -> bool {
                self.ut_type == other.ut_type
                    && self.ut_pid == other.ut_pid
                    && self.ut_line == other.ut_line
                    && self.ut_id == other.ut_id
                    && self.ut_user == other.ut_user
                    && self
                    .ut_host
                    .iter()
                    .zip(other.ut_host.iter())
                    .all(|(a,b)| a == b)
                    && self.ut_exit == other.ut_exit
                    && self.ut_session == other.ut_session
                    && self.ut_tv == other.ut_tv
                    && self.ut_addr_v6 == other.ut_addr_v6
                    && self.__glibc_reserved == other.__glibc_reserved
            }
        }

        impl Eq for utmpx {}

        impl ::fmt::Debug for utmpx {
            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                f.debug_struct("utmpx")
                    .field("ut_type", &self.ut_type)
                    .field("ut_pid", &self.ut_pid)
                    .field("ut_line", &self.ut_line)
                    .field("ut_id", &self.ut_id)
                    .field("ut_user", &self.ut_user)
                // FIXME: .field("ut_host", &self.ut_host)
                    .field("ut_exit", &self.ut_exit)
                    .field("ut_session", &self.ut_session)
                    .field("ut_tv", &self.ut_tv)
                    .field("ut_addr_v6", &self.ut_addr_v6)
                    .field("__glibc_reserved", &self.__glibc_reserved)
                    .finish()
            }
        }

        impl ::hash::Hash for utmpx {
            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                self.ut_type.hash(state);
                self.ut_pid.hash(state);
                self.ut_line.hash(state);
                self.ut_id.hash(state);
                self.ut_user.hash(state);
                self.ut_host.hash(state);
                self.ut_exit.hash(state);
                self.ut_session.hash(state);
                self.ut_tv.hash(state);
                self.ut_addr_v6.hash(state);
                self.__glibc_reserved.hash(state);
            }
        }

        #[cfg(libc_union)]
        impl PartialEq for __c_anonymous_ptrace_syscall_info_data {
            fn eq(&self, other: &__c_anonymous_ptrace_syscall_info_data) -> bool {
                unsafe {
                self.entry == other.entry ||
                    self.exit == other.exit ||
                    self.seccomp == other.seccomp
                }
            }
        }

        #[cfg(libc_union)]
        impl Eq for __c_anonymous_ptrace_syscall_info_data {}

        #[cfg(libc_union)]
        impl ::fmt::Debug for __c_anonymous_ptrace_syscall_info_data {
            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                unsafe {
                f.debug_struct("__c_anonymous_ptrace_syscall_info_data")
                    .field("entry", &self.entry)
                    .field("exit", &self.exit)
                    .field("seccomp", &self.seccomp)
                    .finish()
                }
            }
        }

        #[cfg(libc_union)]
        impl ::hash::Hash for __c_anonymous_ptrace_syscall_info_data {
            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                unsafe {
                self.entry.hash(state);
                self.exit.hash(state);
                self.seccomp.hash(state);
                }
            }
        }
    }
}

// include/uapi/asm-generic/hugetlb_encode.h
pub const HUGETLB_FLAG_ENCODE_SHIFT: ::c_int = 26;
pub const HUGETLB_FLAG_ENCODE_MASK: ::c_int = 0x3f;

pub const HUGETLB_FLAG_ENCODE_64KB: ::c_int = 16 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_512KB: ::c_int = 19 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_1MB: ::c_int = 20 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_2MB: ::c_int = 21 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_8MB: ::c_int = 23 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_16MB: ::c_int = 24 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_32MB: ::c_int = 25 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_256MB: ::c_int = 28 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_512MB: ::c_int = 29 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_1GB: ::c_int = 30 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_2GB: ::c_int = 31 << HUGETLB_FLAG_ENCODE_SHIFT;
pub const HUGETLB_FLAG_ENCODE_16GB: ::c_int = 34 << HUGETLB_FLAG_ENCODE_SHIFT;

// include/uapi/linux/mman.h
/*
 * Huge page size encoding when MAP_HUGETLB is specified, and a huge page
 * size other than the default is desired.  See hugetlb_encode.h.
 * All known huge page size encodings are provided here.  It is the
 * responsibility of the application to know which sizes are supported on
 * the running system.  See mmap(2) man page for details.
 */
pub const MAP_HUGE_SHIFT: ::c_int = HUGETLB_FLAG_ENCODE_SHIFT;
pub const MAP_HUGE_MASK: ::c_int = HUGETLB_FLAG_ENCODE_MASK;

pub const MAP_HUGE_64KB: ::c_int = HUGETLB_FLAG_ENCODE_64KB;
pub const MAP_HUGE_512KB: ::c_int = HUGETLB_FLAG_ENCODE_512KB;
pub const MAP_HUGE_1MB: ::c_int = HUGETLB_FLAG_ENCODE_1MB;
pub const MAP_HUGE_2MB: ::c_int = HUGETLB_FLAG_ENCODE_2MB;
pub const MAP_HUGE_8MB: ::c_int = HUGETLB_FLAG_ENCODE_8MB;
pub const MAP_HUGE_16MB: ::c_int = HUGETLB_FLAG_ENCODE_16MB;
pub const MAP_HUGE_32MB: ::c_int = HUGETLB_FLAG_ENCODE_32MB;
pub const MAP_HUGE_256MB: ::c_int = HUGETLB_FLAG_ENCODE_256MB;
pub const MAP_HUGE_512MB: ::c_int = HUGETLB_FLAG_ENCODE_512MB;
pub const MAP_HUGE_1GB: ::c_int = HUGETLB_FLAG_ENCODE_1GB;
pub const MAP_HUGE_2GB: ::c_int = HUGETLB_FLAG_ENCODE_2GB;
pub const MAP_HUGE_16GB: ::c_int = HUGETLB_FLAG_ENCODE_16GB;

pub const PRIO_PROCESS: ::__priority_which_t = 0;
pub const PRIO_PGRP: ::__priority_which_t = 1;
pub const PRIO_USER: ::__priority_which_t = 2;

pub const MS_RMT_MASK: ::c_ulong = 0x02800051;

pub const __UT_LINESIZE: usize = 32;
pub const __UT_NAMESIZE: usize = 32;
pub const __UT_HOSTSIZE: usize = 256;
pub const EMPTY: ::c_short = 0;
pub const RUN_LVL: ::c_short = 1;
pub const BOOT_TIME: ::c_short = 2;
pub const NEW_TIME: ::c_short = 3;
pub const OLD_TIME: ::c_short = 4;
pub const INIT_PROCESS: ::c_short = 5;
pub const LOGIN_PROCESS: ::c_short = 6;
pub const USER_PROCESS: ::c_short = 7;
pub const DEAD_PROCESS: ::c_short = 8;
pub const ACCOUNTING: ::c_short = 9;

// dlfcn.h
pub const LM_ID_BASE: ::c_long = 0;
pub const LM_ID_NEWLM: ::c_long = -1;

pub const RTLD_DI_LMID: ::c_int = 1;
pub const RTLD_DI_LINKMAP: ::c_int = 2;
pub const RTLD_DI_CONFIGADDR: ::c_int = 3;
pub const RTLD_DI_SERINFO: ::c_int = 4;
pub const RTLD_DI_SERINFOSIZE: ::c_int = 5;
pub const RTLD_DI_ORIGIN: ::c_int = 6;
pub const RTLD_DI_PROFILENAME: ::c_int = 7;
pub const RTLD_DI_PROFILEOUT: ::c_int = 8;
pub const RTLD_DI_TLS_MODID: ::c_int = 9;
pub const RTLD_DI_TLS_DATA: ::c_int = 10;

pub const SOCK_NONBLOCK: ::c_int = O_NONBLOCK;
pub const PIDFD_NONBLOCK: ::c_uint = O_NONBLOCK as ::c_uint;

pub const SOL_RXRPC: ::c_int = 272;
pub const SOL_PPPOL2TP: ::c_int = 273;
pub const SOL_PNPIPE: ::c_int = 275;
pub const SOL_RDS: ::c_int = 276;
pub const SOL_IUCV: ::c_int = 277;
pub const SOL_CAIF: ::c_int = 278;
pub const SOL_NFC: ::c_int = 280;
pub const SOL_XDP: ::c_int = 283;

pub const MSG_TRYHARD: ::c_int = 4;

pub const LC_PAPER: ::c_int = 7;
pub const LC_NAME: ::c_int = 8;
pub const LC_ADDRESS: ::c_int = 9;
pub const LC_TELEPHONE: ::c_int = 10;
pub const LC_MEASUREMENT: ::c_int = 11;
pub const LC_IDENTIFICATION: ::c_int = 12;
pub const LC_PAPER_MASK: ::c_int = 1 << LC_PAPER;
pub const LC_NAME_MASK: ::c_int = 1 << LC_NAME;
pub const LC_ADDRESS_MASK: ::c_int = 1 << LC_ADDRESS;
pub const LC_TELEPHONE_MASK: ::c_int = 1 << LC_TELEPHONE;
pub const LC_MEASUREMENT_MASK: ::c_int = 1 << LC_MEASUREMENT;
pub const LC_IDENTIFICATION_MASK: ::c_int = 1 << LC_IDENTIFICATION;
pub const LC_ALL_MASK: ::c_int = ::LC_CTYPE_MASK
    | ::LC_NUMERIC_MASK
    | ::LC_TIME_MASK
    | ::LC_COLLATE_MASK
    | ::LC_MONETARY_MASK
    | ::LC_MESSAGES_MASK
    | LC_PAPER_MASK
    | LC_NAME_MASK
    | LC_ADDRESS_MASK
    | LC_TELEPHONE_MASK
    | LC_MEASUREMENT_MASK
    | LC_IDENTIFICATION_MASK;

pub const ENOTSUP: ::c_int = EOPNOTSUPP;

pub const SOCK_SEQPACKET: ::c_int = 5;
pub const SOCK_DCCP: ::c_int = 6;
pub const SOCK_PACKET: ::c_int = 10;

pub const AF_IB: ::c_int = 27;
pub const AF_MPLS: ::c_int = 28;
pub const AF_NFC: ::c_int = 39;
pub const AF_VSOCK: ::c_int = 40;
pub const AF_XDP: ::c_int = 44;
pub const PF_IB: ::c_int = AF_IB;
pub const PF_MPLS: ::c_int = AF_MPLS;
pub const PF_NFC: ::c_int = AF_NFC;
pub const PF_VSOCK: ::c_int = AF_VSOCK;
pub const PF_XDP: ::c_int = AF_XDP;

pub const SIGEV_THREAD_ID: ::c_int = 4;

pub const BUFSIZ: ::c_uint = 8192;
pub const TMP_MAX: ::c_uint = 238328;
pub const FOPEN_MAX: ::c_uint = 16;
pub const FILENAME_MAX: ::c_uint = 4096;
pub const POSIX_MADV_DONTNEED: ::c_int = 4;
pub const _CS_GNU_LIBC_VERSION: ::c_int = 2;
pub const _CS_GNU_LIBPTHREAD_VERSION: ::c_int = 3;
pub const _CS_PATH: ::c_int = 0;
pub const _SC_EQUIV_CLASS_MAX: ::c_int = 41;
pub const _SC_CHARCLASS_NAME_MAX: ::c_int = 45;
pub const _SC_PII: ::c_int = 53;
pub const _SC_PII_XTI: ::c_int = 54;
pub const _SC_PII_SOCKET: ::c_int = 55;
pub const _SC_PII_INTERNET: ::c_int = 56;
pub const _SC_PII_OSI: ::c_int = 57;
pub const _SC_POLL: ::c_int = 58;
pub const _SC_SELECT: ::c_int = 59;
pub const _SC_PII_INTERNET_STREAM: ::c_int = 61;
pub const _SC_PII_INTERNET_DGRAM: ::c_int = 62;
pub const _SC_PII_OSI_COTS: ::c_int = 63;
pub const _SC_PII_OSI_CLTS: ::c_int = 64;
pub const _SC_PII_OSI_M: ::c_int = 65;
pub const _SC_T_IOV_MAX: ::c_int = 66;
pub const _SC_2_C_VERSION: ::c_int = 96;
pub const _SC_CHAR_BIT: ::c_int = 101;
pub const _SC_CHAR_MAX: ::c_int = 102;
pub const _SC_CHAR_MIN: ::c_int = 103;
pub const _SC_INT_MAX: ::c_int = 104;
pub const _SC_INT_MIN: ::c_int = 105;
pub const _SC_LONG_BIT: ::c_int = 106;
pub const _SC_WORD_BIT: ::c_int = 107;
pub const _SC_MB_LEN_MAX: ::c_int = 108;
pub const _SC_SSIZE_MAX: ::c_int = 110;
pub const _SC_SCHAR_MAX: ::c_int = 111;
pub const _SC_SCHAR_MIN: ::c_int = 112;
pub const _SC_SHRT_MAX: ::c_int = 113;
pub const _SC_SHRT_MIN: ::c_int = 114;
pub const _SC_UCHAR_MAX: ::c_int = 115;
pub const _SC_UINT_MAX: ::c_int = 116;
pub const _SC_ULONG_MAX: ::c_int = 117;
pub const _SC_USHRT_MAX: ::c_int = 118;
pub const _SC_NL_ARGMAX: ::c_int = 119;
pub const _SC_NL_LANGMAX: ::c_int = 120;
pub const _SC_NL_MSGMAX: ::c_int = 121;
pub const _SC_NL_NMAX: ::c_int = 122;
pub const _SC_NL_SETMAX: ::c_int = 123;
pub const _SC_NL_TEXTMAX: ::c_int = 124;
pub const _SC_BASE: ::c_int = 134;
pub const _SC_C_LANG_SUPPORT: ::c_int = 135;
pub const _SC_C_LANG_SUPPORT_R: ::c_int = 136;
pub const _SC_DEVICE_IO: ::c_int = 140;
pub const _SC_DEVICE_SPECIFIC: ::c_int = 141;
pub const _SC_DEVICE_SPECIFIC_R: ::c_int = 142;
pub const _SC_FD_MGMT: ::c_int = 143;
pub const _SC_FIFO: ::c_int = 144;
pub const _SC_PIPE: ::c_int = 145;
pub const _SC_FILE_ATTRIBUTES: ::c_int = 146;
pub const _SC_FILE_LOCKING: ::c_int = 147;
pub const _SC_FILE_SYSTEM: ::c_int = 148;
pub const _SC_MULTI_PROCESS: ::c_int = 150;
pub const _SC_SINGLE_PROCESS: ::c_int = 151;
pub const _SC_NETWORKING: ::c_int = 152;
pub const _SC_REGEX_VERSION: ::c_int = 156;
pub const _SC_SIGNALS: ::c_int = 158;
pub const _SC_SYSTEM_DATABASE: ::c_int = 162;
pub const _SC_SYSTEM_DATABASE_R: ::c_int = 163;
pub const _SC_USER_GROUPS: ::c_int = 166;
pub const _SC_USER_GROUPS_R: ::c_int = 167;
pub const _SC_LEVEL1_ICACHE_SIZE: ::c_int = 185;
pub const _SC_LEVEL1_ICACHE_ASSOC: ::c_int = 186;
pub const _SC_LEVEL1_ICACHE_LINESIZE: ::c_int = 187;
pub const _SC_LEVEL1_DCACHE_SIZE: ::c_int = 188;
pub const _SC_LEVEL1_DCACHE_ASSOC: ::c_int = 189;
pub const _SC_LEVEL1_DCACHE_LINESIZE: ::c_int = 190;
pub const _SC_LEVEL2_CACHE_SIZE: ::c_int = 191;
pub const _SC_LEVEL2_CACHE_ASSOC: ::c_int = 192;
pub const _SC_LEVEL2_CACHE_LINESIZE: ::c_int = 193;
pub const _SC_LEVEL3_CACHE_SIZE: ::c_int = 194;
pub const _SC_LEVEL3_CACHE_ASSOC: ::c_int = 195;
pub const _SC_LEVEL3_CACHE_LINESIZE: ::c_int = 196;
pub const _SC_LEVEL4_CACHE_SIZE: ::c_int = 197;
pub const _SC_LEVEL4_CACHE_ASSOC: ::c_int = 198;
pub const _SC_LEVEL4_CACHE_LINESIZE: ::c_int = 199;
pub const O_ACCMODE: ::c_int = 3;
pub const ST_RELATIME: ::c_ulong = 4096;
pub const NI_MAXHOST: ::socklen_t = 1025;

// Most `*_SUPER_MAGIC` constants are defined at the `linux_like` level; the
// following are only available on newer Linux versions than the versions
// currently used in CI in some configurations, so we define them here.
cfg_if! {
    if #[cfg(not(target_arch = "s390x"))] {
        pub const BINDERFS_SUPER_MAGIC: ::c_long = 0x6c6f6f70;
        pub const XFS_SUPER_MAGIC: ::c_long = 0x58465342;
    } else if #[cfg(target_arch = "s390x")] {
        pub const BINDERFS_SUPER_MAGIC: ::c_uint = 0x6c6f6f70;
        pub const XFS_SUPER_MAGIC: ::c_uint = 0x58465342;
    }
}

pub const CPU_SETSIZE: ::c_int = 0x400;

pub const PTRACE_TRACEME: ::c_uint = 0;
pub const PTRACE_PEEKTEXT: ::c_uint = 1;
pub const PTRACE_PEEKDATA: ::c_uint = 2;
pub const PTRACE_PEEKUSER: ::c_uint = 3;
pub const PTRACE_POKETEXT: ::c_uint = 4;
pub const PTRACE_POKEDATA: ::c_uint = 5;
pub const PTRACE_POKEUSER: ::c_uint = 6;
pub const PTRACE_CONT: ::c_uint = 7;
pub const PTRACE_KILL: ::c_uint = 8;
pub const PTRACE_SINGLESTEP: ::c_uint = 9;
pub const PTRACE_ATTACH: ::c_uint = 16;
pub const PTRACE_SYSCALL: ::c_uint = 24;
pub const PTRACE_SETOPTIONS: ::c_uint = 0x4200;
pub const PTRACE_GETEVENTMSG: ::c_uint = 0x4201;
pub const PTRACE_GETSIGINFO: ::c_uint = 0x4202;
pub const PTRACE_SETSIGINFO: ::c_uint = 0x4203;
pub const PTRACE_GETREGSET: ::c_uint = 0x4204;
pub const PTRACE_SETREGSET: ::c_uint = 0x4205;
pub const PTRACE_SEIZE: ::c_uint = 0x4206;
pub const PTRACE_INTERRUPT: ::c_uint = 0x4207;
pub const PTRACE_LISTEN: ::c_uint = 0x4208;
pub const PTRACE_PEEKSIGINFO: ::c_uint = 0x4209;
pub const PTRACE_GETSIGMASK: ::c_uint = 0x420a;
pub const PTRACE_SETSIGMASK: ::c_uint = 0x420b;
pub const PTRACE_GET_SYSCALL_INFO: ::c_uint = 0x420e;
pub const PTRACE_SYSCALL_INFO_NONE: ::__u8 = 0;
pub const PTRACE_SYSCALL_INFO_ENTRY: ::__u8 = 1;
pub const PTRACE_SYSCALL_INFO_EXIT: ::__u8 = 2;
pub const PTRACE_SYSCALL_INFO_SECCOMP: ::__u8 = 3;

// linux/fs.h

// Flags for preadv2/pwritev2
pub const RWF_HIPRI: ::c_int = 0x00000001;
pub const RWF_DSYNC: ::c_int = 0x00000002;
pub const RWF_SYNC: ::c_int = 0x00000004;
pub const RWF_NOWAIT: ::c_int = 0x00000008;
pub const RWF_APPEND: ::c_int = 0x00000010;

// linux/rtnetlink.h
pub const TCA_PAD: ::c_ushort = 9;
pub const TCA_DUMP_INVISIBLE: ::c_ushort = 10;
pub const TCA_CHAIN: ::c_ushort = 11;
pub const TCA_HW_OFFLOAD: ::c_ushort = 12;

pub const RTM_DELNETCONF: u16 = 81;
pub const RTM_NEWSTATS: u16 = 92;
pub const RTM_GETSTATS: u16 = 94;
pub const RTM_NEWCACHEREPORT: u16 = 96;

pub const RTM_F_LOOKUP_TABLE: ::c_uint = 0x1000;
pub const RTM_F_FIB_MATCH: ::c_uint = 0x2000;

pub const RTA_VIA: ::c_ushort = 18;
pub const RTA_NEWDST: ::c_ushort = 19;
pub const RTA_PREF: ::c_ushort = 20;
pub const RTA_ENCAP_TYPE: ::c_ushort = 21;
pub const RTA_ENCAP: ::c_ushort = 22;
pub const RTA_EXPIRES: ::c_ushort = 23;
pub const RTA_PAD: ::c_ushort = 24;
pub const RTA_UID: ::c_ushort = 25;
pub const RTA_TTL_PROPAGATE: ::c_ushort = 26;

// linux/neighbor.h
pub const NTF_EXT_LEARNED: u8 = 0x10;
pub const NTF_OFFLOADED: u8 = 0x20;

pub const NDA_MASTER: ::c_ushort = 9;
pub const NDA_LINK_NETNSID: ::c_ushort = 10;
pub const NDA_SRC_VNI: ::c_ushort = 11;

// linux/personality.h
pub const UNAME26: ::c_int = 0x0020000;
pub const FDPIC_FUNCPTRS: ::c_int = 0x0080000;

// linux/if_addr.h
pub const IFA_FLAGS: ::c_ushort = 8;

pub const IFA_F_MANAGETEMPADDR: u32 = 0x100;
pub const IFA_F_NOPREFIXROUTE: u32 = 0x200;
pub const IFA_F_MCAUTOJOIN: u32 = 0x400;
pub const IFA_F_STABLE_PRIVACY: u32 = 0x800;

pub const MAX_LINKS: ::c_int = 32;

pub const GENL_UNS_ADMIN_PERM: ::c_int = 0x10;

pub const GENL_ID_VFS_DQUOT: ::c_int = ::NLMSG_MIN_TYPE + 1;
pub const GENL_ID_PMCRAID: ::c_int = ::NLMSG_MIN_TYPE + 2;

// linux/if_xdp.h
pub const XDP_SHARED_UMEM: ::__u16 = 1 << 0;
pub const XDP_COPY: ::__u16 = 1 << 1;
pub const XDP_ZEROCOPY: ::__u16 = 1 << 2;
pub const XDP_USE_NEED_WAKEUP: ::__u16 = 1 << 3;
pub const XDP_USE_SG: ::__u16 = 1 << 4;

pub const XDP_UMEM_UNALIGNED_CHUNK_FLAG: ::__u32 = 1 << 0;

pub const XDP_RING_NEED_WAKEUP: ::__u32 = 1 << 0;

pub const XDP_MMAP_OFFSETS: ::c_int = 1;
pub const XDP_RX_RING: ::c_int = 2;
pub const XDP_TX_RING: ::c_int = 3;
pub const XDP_UMEM_REG: ::c_int = 4;
pub const XDP_UMEM_FILL_RING: ::c_int = 5;
pub const XDP_UMEM_COMPLETION_RING: ::c_int = 6;
pub const XDP_STATISTICS: ::c_int = 7;
pub const XDP_OPTIONS: ::c_int = 8;

pub const XDP_OPTIONS_ZEROCOPY: ::__u32 = 1 << 0;

pub const XDP_PGOFF_RX_RING: ::off_t = 0;
pub const XDP_PGOFF_TX_RING: ::off_t = 0x80000000;
pub const XDP_UMEM_PGOFF_FILL_RING: ::c_ulonglong = 0x100000000;
pub const XDP_UMEM_PGOFF_COMPLETION_RING: ::c_ulonglong = 0x180000000;

pub const XSK_UNALIGNED_BUF_OFFSET_SHIFT: ::c_int = 48;
pub const XSK_UNALIGNED_BUF_ADDR_MASK: ::c_ulonglong = (1 << XSK_UNALIGNED_BUF_OFFSET_SHIFT) - 1;

pub const XDP_PKT_CONTD: ::__u32 = 1 << 0;

// elf.h
pub const NT_PRSTATUS: ::c_int = 1;
pub const NT_PRFPREG: ::c_int = 2;
pub const NT_FPREGSET: ::c_int = 2;
pub const NT_PRPSINFO: ::c_int = 3;
pub const NT_PRXREG: ::c_int = 4;
pub const NT_TASKSTRUCT: ::c_int = 4;
pub const NT_PLATFORM: ::c_int = 5;
pub const NT_AUXV: ::c_int = 6;
pub const NT_GWINDOWS: ::c_int = 7;
pub const NT_ASRS: ::c_int = 8;
pub const NT_PSTATUS: ::c_int = 10;
pub const NT_PSINFO: ::c_int = 13;
pub const NT_PRCRED: ::c_int = 14;
pub const NT_UTSNAME: ::c_int = 15;
pub const NT_LWPSTATUS: ::c_int = 16;
pub const NT_LWPSINFO: ::c_int = 17;
pub const NT_PRFPXREG: ::c_int = 20;

pub const ELFOSABI_ARM_AEABI: u8 = 64;

// linux/sched.h
pub const CLONE_NEWTIME: ::c_int = 0x80;
pub const CLONE_CLEAR_SIGHAND: ::c_int = 0x100000000;
pub const CLONE_INTO_CGROUP: ::c_int = 0x200000000;

// linux/keyctl.h
pub const KEYCTL_DH_COMPUTE: u32 = 23;
pub const KEYCTL_PKEY_QUERY: u32 = 24;
pub const KEYCTL_PKEY_ENCRYPT: u32 = 25;
pub const KEYCTL_PKEY_DECRYPT: u32 = 26;
pub const KEYCTL_PKEY_SIGN: u32 = 27;
pub const KEYCTL_PKEY_VERIFY: u32 = 28;
pub const KEYCTL_RESTRICT_KEYRING: u32 = 29;

pub const KEYCTL_SUPPORTS_ENCRYPT: u32 = 0x01;
pub const KEYCTL_SUPPORTS_DECRYPT: u32 = 0x02;
pub const KEYCTL_SUPPORTS_SIGN: u32 = 0x04;
pub const KEYCTL_SUPPORTS_VERIFY: u32 = 0x08;
cfg_if! {
    if #[cfg(not(any(target_arch = "mips",
                     target_arch = "mips32r6",
                     target_arch = "mips64",
                     target_arch = "mips64r6")))] {
        pub const KEYCTL_MOVE: u32 = 30;
        pub const KEYCTL_CAPABILITIES: u32 = 31;

        pub const KEYCTL_CAPS0_CAPABILITIES: u32 = 0x01;
        pub const KEYCTL_CAPS0_PERSISTENT_KEYRINGS: u32 = 0x02;
        pub const KEYCTL_CAPS0_DIFFIE_HELLMAN: u32 = 0x04;
        pub const KEYCTL_CAPS0_PUBLIC_KEY: u32 = 0x08;
        pub const KEYCTL_CAPS0_BIG_KEY: u32 = 0x10;
        pub const KEYCTL_CAPS0_INVALIDATE: u32 = 0x20;
        pub const KEYCTL_CAPS0_RESTRICT_KEYRING: u32 = 0x40;
        pub const KEYCTL_CAPS0_MOVE: u32 = 0x80;
        pub const KEYCTL_CAPS1_NS_KEYRING_NAME: u32 = 0x01;
        pub const KEYCTL_CAPS1_NS_KEY_TAG: u32 = 0x02;
    }
}

pub const M_MXFAST: ::c_int = 1;
pub const M_NLBLKS: ::c_int = 2;
pub const M_GRAIN: ::c_int = 3;
pub const M_KEEP: ::c_int = 4;
pub const M_TRIM_THRESHOLD: ::c_int = -1;
pub const M_TOP_PAD: ::c_int = -2;
pub const M_MMAP_THRESHOLD: ::c_int = -3;
pub const M_MMAP_MAX: ::c_int = -4;
pub const M_CHECK_ACTION: ::c_int = -5;
pub const M_PERTURB: ::c_int = -6;
pub const M_ARENA_TEST: ::c_int = -7;
pub const M_ARENA_MAX: ::c_int = -8;

pub const AT_STATX_SYNC_TYPE: ::c_int = 0x6000;
pub const AT_STATX_SYNC_AS_STAT: ::c_int = 0x0000;
pub const AT_STATX_FORCE_SYNC: ::c_int = 0x2000;
pub const AT_STATX_DONT_SYNC: ::c_int = 0x4000;
pub const STATX_TYPE: ::c_uint = 0x0001;
pub const STATX_MODE: ::c_uint = 0x0002;
pub const STATX_NLINK: ::c_uint = 0x0004;
pub const STATX_UID: ::c_uint = 0x0008;
pub const STATX_GID: ::c_uint = 0x0010;
pub const STATX_ATIME: ::c_uint = 0x0020;
pub const STATX_MTIME: ::c_uint = 0x0040;
pub const STATX_CTIME: ::c_uint = 0x0080;
pub const STATX_INO: ::c_uint = 0x0100;
pub const STATX_SIZE: ::c_uint = 0x0200;
pub const STATX_BLOCKS: ::c_uint = 0x0400;
pub const STATX_BASIC_STATS: ::c_uint = 0x07ff;
pub const STATX_BTIME: ::c_uint = 0x0800;
pub const STATX_MNT_ID: ::c_uint = 0x1000;
pub const STATX_DIOALIGN: ::c_uint = 0x2000;
pub const STATX_ALL: ::c_uint = 0x0fff;
pub const STATX__RESERVED: ::c_int = 0x80000000;
pub const STATX_ATTR_COMPRESSED: ::c_int = 0x0004;
pub const STATX_ATTR_IMMUTABLE: ::c_int = 0x0010;
pub const STATX_ATTR_APPEND: ::c_int = 0x0020;
pub const STATX_ATTR_NODUMP: ::c_int = 0x0040;
pub const STATX_ATTR_ENCRYPTED: ::c_int = 0x0800;
pub const STATX_ATTR_AUTOMOUNT: ::c_int = 0x1000;
pub const STATX_ATTR_MOUNT_ROOT: ::c_int = 0x2000;
pub const STATX_ATTR_VERITY: ::c_int = 0x00100000;
pub const STATX_ATTR_DAX: ::c_int = 0x00200000;

pub const SOMAXCONN: ::c_int = 4096;

// linux/mount.h
pub const MOVE_MOUNT_F_SYMLINKS: ::c_uint = 0x00000001;
pub const MOVE_MOUNT_F_AUTOMOUNTS: ::c_uint = 0x00000002;
pub const MOVE_MOUNT_F_EMPTY_PATH: ::c_uint = 0x00000004;
pub const MOVE_MOUNT_T_SYMLINKS: ::c_uint = 0x00000010;
pub const MOVE_MOUNT_T_AUTOMOUNTS: ::c_uint = 0x00000020;
pub const MOVE_MOUNT_T_EMPTY_PATH: ::c_uint = 0x00000040;
pub const MOVE_MOUNT_SET_GROUP: ::c_uint = 0x00000100;
pub const MOVE_MOUNT_BENEATH: ::c_uint = 0x00000200;

// sys/timex.h
pub const ADJ_OFFSET: ::c_uint = 0x0001;
pub const ADJ_FREQUENCY: ::c_uint = 0x0002;
pub const ADJ_MAXERROR: ::c_uint = 0x0004;
pub const ADJ_ESTERROR: ::c_uint = 0x0008;
pub const ADJ_STATUS: ::c_uint = 0x0010;
pub const ADJ_TIMECONST: ::c_uint = 0x0020;
pub const ADJ_TAI: ::c_uint = 0x0080;
pub const ADJ_SETOFFSET: ::c_uint = 0x0100;
pub const ADJ_MICRO: ::c_uint = 0x1000;
pub const ADJ_NANO: ::c_uint = 0x2000;
pub const ADJ_TICK: ::c_uint = 0x4000;
pub const ADJ_OFFSET_SINGLESHOT: ::c_uint = 0x8001;
pub const ADJ_OFFSET_SS_READ: ::c_uint = 0xa001;
pub const MOD_OFFSET: ::c_uint = ADJ_OFFSET;
pub const MOD_FREQUENCY: ::c_uint = ADJ_FREQUENCY;
pub const MOD_MAXERROR: ::c_uint = ADJ_MAXERROR;
pub const MOD_ESTERROR: ::c_uint = ADJ_ESTERROR;
pub const MOD_STATUS: ::c_uint = ADJ_STATUS;
pub const MOD_TIMECONST: ::c_uint = ADJ_TIMECONST;
pub const MOD_CLKB: ::c_uint = ADJ_TICK;
pub const MOD_CLKA: ::c_uint = ADJ_OFFSET_SINGLESHOT;
pub const MOD_TAI: ::c_uint = ADJ_TAI;
pub const MOD_MICRO: ::c_uint = ADJ_MICRO;
pub const MOD_NANO: ::c_uint = ADJ_NANO;
pub const STA_PLL: ::c_int = 0x0001;
pub const STA_PPSFREQ: ::c_int = 0x0002;
pub const STA_PPSTIME: ::c_int = 0x0004;
pub const STA_FLL: ::c_int = 0x0008;
pub const STA_INS: ::c_int = 0x0010;
pub const STA_DEL: ::c_int = 0x0020;
pub const STA_UNSYNC: ::c_int = 0x0040;
pub const STA_FREQHOLD: ::c_int = 0x0080;
pub const STA_PPSSIGNAL: ::c_int = 0x0100;
pub const STA_PPSJITTER: ::c_int = 0x0200;
pub const STA_PPSWANDER: ::c_int = 0x0400;
pub const STA_PPSERROR: ::c_int = 0x0800;
pub const STA_CLOCKERR: ::c_int = 0x1000;
pub const STA_NANO: ::c_int = 0x2000;
pub const STA_MODE: ::c_int = 0x4000;
pub const STA_CLK: ::c_int = 0x8000;
pub const STA_RONLY: ::c_int = STA_PPSSIGNAL
    | STA_PPSJITTER
    | STA_PPSWANDER
    | STA_PPSERROR
    | STA_CLOCKERR
    | STA_NANO
    | STA_MODE
    | STA_CLK;
pub const NTP_API: ::c_int = 4;
pub const TIME_OK: ::c_int = 0;
pub const TIME_INS: ::c_int = 1;
pub const TIME_DEL: ::c_int = 2;
pub const TIME_OOP: ::c_int = 3;
pub const TIME_WAIT: ::c_int = 4;
pub const TIME_ERROR: ::c_int = 5;
pub const TIME_BAD: ::c_int = TIME_ERROR;
pub const MAXTC: ::c_long = 6;

// Portable GLOB_* flags are defined at the `linux_like` level.
// The following are GNU extensions.
pub const GLOB_PERIOD: ::c_int = 1 << 7;
pub const GLOB_ALTDIRFUNC: ::c_int = 1 << 9;
pub const GLOB_BRACE: ::c_int = 1 << 10;
pub const GLOB_NOMAGIC: ::c_int = 1 << 11;
pub const GLOB_TILDE: ::c_int = 1 << 12;
pub const GLOB_ONLYDIR: ::c_int = 1 << 13;
pub const GLOB_TILDE_CHECK: ::c_int = 1 << 14;

pub const MADV_COLLAPSE: ::c_int = 25;

cfg_if! {
    if #[cfg(any(
        target_arch = "arm",
        target_arch = "x86",
        target_arch = "x86_64",
        target_arch = "s390x",
        target_arch = "riscv64",
        target_arch = "riscv32"
    ))] {
        pub const PTHREAD_STACK_MIN: ::size_t = 16384;
    } else if #[cfg(any(
               target_arch = "sparc",
               target_arch = "sparc64"
           ))] {
        pub const PTHREAD_STACK_MIN: ::size_t = 0x6000;
    } else {
        pub const PTHREAD_STACK_MIN: ::size_t = 131072;
    }
}
pub const PTHREAD_MUTEX_ADAPTIVE_NP: ::c_int = 3;

pub const REG_STARTEND: ::c_int = 4;

pub const REG_EEND: ::c_int = 14;
pub const REG_ESIZE: ::c_int = 15;
pub const REG_ERPAREN: ::c_int = 16;

extern "C" {
    pub fn fgetspent_r(
        fp: *mut ::FILE,
        spbuf: *mut ::spwd,
        buf: *mut ::c_char,
        buflen: ::size_t,
        spbufp: *mut *mut ::spwd,
    ) -> ::c_int;
    pub fn sgetspent_r(
        s: *const ::c_char,
        spbuf: *mut ::spwd,
        buf: *mut ::c_char,
        buflen: ::size_t,
        spbufp: *mut *mut ::spwd,
    ) -> ::c_int;
    pub fn getspent_r(
        spbuf: *mut ::spwd,
        buf: *mut ::c_char,
        buflen: ::size_t,
        spbufp: *mut *mut ::spwd,
    ) -> ::c_int;
    pub fn qsort_r(
        base: *mut ::c_void,
        num: ::size_t,
        size: ::size_t,
        compar: ::Option<
            unsafe extern "C" fn(*const ::c_void, *const ::c_void, *mut ::c_void) -> ::c_int,
        >,
        arg: *mut ::c_void,
    );
    pub fn sendmmsg(
        sockfd: ::c_int,
        msgvec: *mut ::mmsghdr,
        vlen: ::c_uint,
        flags: ::c_int,
    ) -> ::c_int;
    pub fn recvmmsg(
        sockfd: ::c_int,
        msgvec: *mut ::mmsghdr,
        vlen: ::c_uint,
        flags: ::c_int,
        timeout: *mut ::timespec,
    ) -> ::c_int;

    pub fn getrlimit64(resource: ::__rlimit_resource_t, rlim: *mut ::rlimit64) -> ::c_int;
    pub fn setrlimit64(resource: ::__rlimit_resource_t, rlim: *const ::rlimit64) -> ::c_int;
    pub fn getrlimit(resource: ::__rlimit_resource_t, rlim: *mut ::rlimit) -> ::c_int;
    pub fn setrlimit(resource: ::__rlimit_resource_t, rlim: *const ::rlimit) -> ::c_int;
    pub fn prlimit(
        pid: ::pid_t,
        resource: ::__rlimit_resource_t,
        new_limit: *const ::rlimit,
        old_limit: *mut ::rlimit,
    ) -> ::c_int;
    pub fn prlimit64(
        pid: ::pid_t,
        resource: ::__rlimit_resource_t,
        new_limit: *const ::rlimit64,
        old_limit: *mut ::rlimit64,
    ) -> ::c_int;
    pub fn utmpname(file: *const ::c_char) -> ::c_int;
    pub fn utmpxname(file: *const ::c_char) -> ::c_int;
    pub fn getutxent() -> *mut utmpx;
    pub fn getutxid(ut: *const utmpx) -> *mut utmpx;
    pub fn getutxline(ut: *const utmpx) -> *mut utmpx;
    pub fn pututxline(ut: *const utmpx) -> *mut utmpx;
    pub fn setutxent();
    pub fn endutxent();
    pub fn getpt() -> ::c_int;
    pub fn mallopt(param: ::c_int, value: ::c_int) -> ::c_int;
    pub fn gettimeofday(tp: *mut ::timeval, tz: *mut ::timezone) -> ::c_int;
    pub fn statx(
        dirfd: ::c_int,
        pathname: *const c_char,
        flags: ::c_int,
        mask: ::c_uint,
        statxbuf: *mut statx,
    ) -> ::c_int;
    pub fn getentropy(buf: *mut ::c_void, buflen: ::size_t) -> ::c_int;
    pub fn getrandom(buf: *mut ::c_void, buflen: ::size_t, flags: ::c_uint) -> ::ssize_t;
    pub fn getauxval(type_: ::c_ulong) -> ::c_ulong;

    pub fn adjtimex(buf: *mut timex) -> ::c_int;
    pub fn ntp_adjtime(buf: *mut timex) -> ::c_int;
    #[link_name = "ntp_gettimex"]
    pub fn ntp_gettime(buf: *mut ntptimeval) -> ::c_int;
    pub fn clock_adjtime(clk_id: ::clockid_t, buf: *mut ::timex) -> ::c_int;

    pub fn fanotify_mark(
        fd: ::c_int,
        flags: ::c_uint,
        mask: u64,
        dirfd: ::c_int,
        path: *const ::c_char,
    ) -> ::c_int;
    pub fn preadv2(
        fd: ::c_int,
        iov: *const ::iovec,
        iovcnt: ::c_int,
        offset: ::off_t,
        flags: ::c_int,
    ) -> ::ssize_t;
    pub fn pwritev2(
        fd: ::c_int,
        iov: *const ::iovec,
        iovcnt: ::c_int,
        offset: ::off_t,
        flags: ::c_int,
    ) -> ::ssize_t;
    pub fn preadv64v2(
        fd: ::c_int,
        iov: *const ::iovec,
        iovcnt: ::c_int,
        offset: ::off64_t,
        flags: ::c_int,
    ) -> ::ssize_t;
    pub fn pwritev64v2(
        fd: ::c_int,
        iov: *const ::iovec,
        iovcnt: ::c_int,
        offset: ::off64_t,
        flags: ::c_int,
    ) -> ::ssize_t;
    pub fn renameat2(
        olddirfd: ::c_int,
        oldpath: *const ::c_char,
        newdirfd: ::c_int,
        newpath: *const ::c_char,
        flags: ::c_uint,
    ) -> ::c_int;

    // Added in `glibc` 2.25
    pub fn explicit_bzero(s: *mut ::c_void, len: ::size_t);
    // Added in `glibc` 2.29
    pub fn reallocarray(ptr: *mut ::c_void, nmemb: ::size_t, size: ::size_t) -> *mut ::c_void;

    pub fn ctermid(s: *mut ::c_char) -> *mut ::c_char;
    pub fn ioctl(fd: ::c_int, request: ::c_ulong, ...) -> ::c_int;
    pub fn backtrace(buf: *mut *mut ::c_void, sz: ::c_int) -> ::c_int;
    pub fn glob64(
        pattern: *const ::c_char,
        flags: ::c_int,
        errfunc: ::Option<extern "C" fn(epath: *const ::c_char, errno: ::c_int) -> ::c_int>,
        pglob: *mut glob64_t,
    ) -> ::c_int;
    pub fn globfree64(pglob: *mut glob64_t);
    pub fn ptrace(request: ::c_uint, ...) -> ::c_long;
    pub fn pthread_attr_getaffinity_np(
        attr: *const ::pthread_attr_t,
        cpusetsize: ::size_t,
        cpuset: *mut ::cpu_set_t,
    ) -> ::c_int;
    pub fn pthread_attr_setaffinity_np(
        attr: *mut ::pthread_attr_t,
        cpusetsize: ::size_t,
        cpuset: *const ::cpu_set_t,
    ) -> ::c_int;
    pub fn getpriority(which: ::__priority_which_t, who: ::id_t) -> ::c_int;
    pub fn setpriority(which: ::__priority_which_t, who: ::id_t, prio: ::c_int) -> ::c_int;
    pub fn pthread_rwlockattr_getkind_np(
        attr: *const ::pthread_rwlockattr_t,
        val: *mut ::c_int,
    ) -> ::c_int;
    pub fn pthread_rwlockattr_setkind_np(
        attr: *mut ::pthread_rwlockattr_t,
        val: ::c_int,
    ) -> ::c_int;
    pub fn pthread_sigqueue(thread: ::pthread_t, sig: ::c_int, value: ::sigval) -> ::c_int;
    pub fn mallinfo() -> ::mallinfo;
    pub fn mallinfo2() -> ::mallinfo2;
    pub fn malloc_info(options: ::c_int, stream: *mut ::FILE) -> ::c_int;
    pub fn malloc_usable_size(ptr: *mut ::c_void) -> ::size_t;
    pub fn getpwent_r(
        pwd: *mut ::passwd,
        buf: *mut ::c_char,
        buflen: ::size_t,
        result: *mut *mut ::passwd,
    ) -> ::c_int;
    pub fn getgrent_r(
        grp: *mut ::group,
        buf: *mut ::c_char,
        buflen: ::size_t,
        result: *mut *mut ::group,
    ) -> ::c_int;
    pub fn fgetpwent_r(
        stream: *mut ::FILE,
        pwd: *mut ::passwd,
        buf: *mut ::c_char,
        buflen: ::size_t,
        result: *mut *mut ::passwd,
    ) -> ::c_int;
    pub fn fgetgrent_r(
        stream: *mut ::FILE,
        grp: *mut ::group,
        buf: *mut ::c_char,
        buflen: ::size_t,
        result: *mut *mut ::group,
    ) -> ::c_int;

    pub fn putpwent(p: *const ::passwd, stream: *mut ::FILE) -> ::c_int;
    pub fn putgrent(grp: *const ::group, stream: *mut ::FILE) -> ::c_int;

    pub fn sethostid(hostid: ::c_long) -> ::c_int;

    pub fn memfd_create(name: *const ::c_char, flags: ::c_uint) -> ::c_int;
    pub fn mlock2(addr: *const ::c_void, len: ::size_t, flags: ::c_uint) -> ::c_int;

    pub fn euidaccess(pathname: *const ::c_char, mode: ::c_int) -> ::c_int;
    pub fn eaccess(pathname: *const ::c_char, mode: ::c_int) -> ::c_int;

    pub fn asctime_r(tm: *const ::tm, buf: *mut ::c_char) -> *mut ::c_char;
    pub fn ctime_r(timep: *const time_t, buf: *mut ::c_char) -> *mut ::c_char;

    pub fn confstr(name: ::c_int, buf: *mut ::c_char, len: ::size_t) -> ::size_t;
    pub fn dirname(path: *mut ::c_char) -> *mut ::c_char;
    /// POSIX version of `basename(3)`, defined in `libgen.h`.
    #[link_name = "__xpg_basename"]
    pub fn posix_basename(path: *mut ::c_char) -> *mut ::c_char;
    /// GNU version of `basename(3)`, defined in `string.h`.
    #[link_name = "basename"]
    pub fn gnu_basename(path: *const ::c_char) -> *mut ::c_char;
    pub fn dlmopen(lmid: Lmid_t, filename: *const ::c_char, flag: ::c_int) -> *mut ::c_void;
    pub fn dlinfo(handle: *mut ::c_void, request: ::c_int, info: *mut ::c_void) -> ::c_int;
    pub fn dladdr1(
        addr: *const ::c_void,
        info: *mut ::Dl_info,
        extra_info: *mut *mut ::c_void,
        flags: ::c_int,
    ) -> ::c_int;
    pub fn malloc_trim(__pad: ::size_t) -> ::c_int;
    pub fn gnu_get_libc_release() -> *const ::c_char;
    pub fn gnu_get_libc_version() -> *const ::c_char;

    // posix/spawn.h
    // Added in `glibc` 2.29
    pub fn posix_spawn_file_actions_addchdir_np(
        actions: *mut ::posix_spawn_file_actions_t,
        path: *const ::c_char,
    ) -> ::c_int;
    // Added in `glibc` 2.29
    pub fn posix_spawn_file_actions_addfchdir_np(
        actions: *mut ::posix_spawn_file_actions_t,
        fd: ::c_int,
    ) -> ::c_int;
    // Added in `glibc` 2.34
    pub fn posix_spawn_file_actions_addclosefrom_np(
        actions: *mut ::posix_spawn_file_actions_t,
        from: ::c_int,
    ) -> ::c_int;
    // Added in `glibc` 2.35
    pub fn posix_spawn_file_actions_addtcsetpgrp_np(
        actions: *mut ::posix_spawn_file_actions_t,
        tcfd: ::c_int,
    ) -> ::c_int;

    // mntent.h
    pub fn getmntent_r(
        stream: *mut ::FILE,
        mntbuf: *mut ::mntent,
        buf: *mut ::c_char,
        buflen: ::c_int,
    ) -> *mut ::mntent;

    pub fn execveat(
        dirfd: ::c_int,
        pathname: *const ::c_char,
        argv: *const *mut c_char,
        envp: *const *mut c_char,
        flags: ::c_int,
    ) -> ::c_int;

    // Added in `glibc` 2.34
    pub fn close_range(first: ::c_uint, last: ::c_uint, flags: ::c_int) -> ::c_int;
}

cfg_if! {
    if #[cfg(any(target_arch = "x86",
                 target_arch = "arm",
                 target_arch = "m68k",
                 target_arch = "csky",
                 target_arch = "mips",
                 target_arch = "mips32r6",
                 target_arch = "powerpc",
                 target_arch = "sparc",
                 target_arch = "riscv32"))] {
        mod b32;
        pub use self::b32::*;
    } else if #[cfg(any(target_arch = "x86_64",
                        target_arch = "aarch64",
                        target_arch = "powerpc64",
                        target_arch = "mips64",
                        target_arch = "mips64r6",
                        target_arch = "s390x",
                        target_arch = "sparc64",
                        target_arch = "riscv64",
                        target_arch = "loongarch64"))] {
        mod b64;
        pub use self::b64::*;
    } else {
        // Unknown target_arch
    }
}

cfg_if! {
    if #[cfg(libc_align)] {
        mod align;
        pub use self::align::*;
    } else {
        mod no_align;
        pub use self::no_align::*;
    }
}