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    //! x86_64-specific definitions for 64-bit linux-like values

    pub type c_char = i8;
    pub type wchar_t = i32;
    pub type nlink_t = u64;
    pub type blksize_t = i64;
    pub type greg_t = i64;
    pub type suseconds_t = i64;
    pub type __u64 = ::c_ulonglong;
    pub type __s64 = ::c_longlong;

    s! {
        pub struct sigaction {
            pub sa_sigaction: ::sighandler_t,
            pub sa_mask: ::sigset_t,
            #[cfg(target_arch = "sparc64")]
            __reserved0: ::c_int,
            pub sa_flags: ::c_int,
            pub sa_restorer: ::Option<extern fn()>,
        }

        pub struct statfs {
            pub f_type: ::__fsword_t,
            pub f_bsize: ::__fsword_t,
            pub f_blocks: ::fsblkcnt_t,
            pub f_bfree: ::fsblkcnt_t,
            pub f_bavail: ::fsblkcnt_t,

            pub f_files: ::fsfilcnt_t,
            pub f_ffree: ::fsfilcnt_t,
            pub f_fsid: ::fsid_t,

            pub f_namelen: ::__fsword_t,
            pub f_frsize: ::__fsword_t,
            f_spare: [::__fsword_t; 5],
        }

        pub struct flock {
            pub l_type: ::c_short,
            pub l_whence: ::c_short,
            pub l_start: ::off_t,
            pub l_len: ::off_t,
            pub l_pid: ::pid_t,
        }

        pub struct flock64 {
            pub l_type: ::c_short,
            pub l_whence: ::c_short,
            pub l_start: ::off64_t,
            pub l_len: ::off64_t,
            pub l_pid: ::pid_t,
        }

        pub struct siginfo_t {
            pub si_signo: ::c_int,
            pub si_errno: ::c_int,
            pub si_code: ::c_int,
            #[doc(hidden)]
            #[deprecated(
                since="0.2.54",
                note="Please leave a comment on \
                      https://github.com/rust-lang/libc/pull/1316 if you're using \
                      this field"
            )]
            pub _pad: [::c_int; 29],
            _align: [u64; 0],
        }

        pub struct stack_t {
            pub ss_sp: *mut ::c_void,
            pub ss_flags: ::c_int,
            pub ss_size: ::size_t
        }

        pub struct stat {
            pub st_dev: ::dev_t,
            pub st_ino: ::ino_t,
            pub st_nlink: ::nlink_t,
            pub st_mode: ::mode_t,
            pub st_uid: ::uid_t,
            pub st_gid: ::gid_t,
            __pad0: ::c_int,
            pub st_rdev: ::dev_t,
            pub st_size: ::off_t,
            pub st_blksize: ::blksize_t,
            pub st_blocks: ::blkcnt_t,
            pub st_atime: ::time_t,
            pub st_atime_nsec: i64,
            pub st_mtime: ::time_t,
            pub st_mtime_nsec: i64,
            pub st_ctime: ::time_t,
            pub st_ctime_nsec: i64,
            __unused: [i64; 3],
        }

        pub struct stat64 {
            pub st_dev: ::dev_t,
            pub st_ino: ::ino64_t,
            pub st_nlink: ::nlink_t,
            pub st_mode: ::mode_t,
            pub st_uid: ::uid_t,
            pub st_gid: ::gid_t,
            __pad0: ::c_int,
            pub st_rdev: ::dev_t,
            pub st_size: ::off_t,
            pub st_blksize: ::blksize_t,
            pub st_blocks: ::blkcnt64_t,
            pub st_atime: ::time_t,
            pub st_atime_nsec: i64,
            pub st_mtime: ::time_t,
            pub st_mtime_nsec: i64,
            pub st_ctime: ::time_t,
            pub st_ctime_nsec: i64,
            __reserved: [i64; 3],
        }

        pub struct statfs64 {
            pub f_type: ::__fsword_t,
            pub f_bsize: ::__fsword_t,
            pub f_blocks: u64,
            pub f_bfree: u64,
            pub f_bavail: u64,
            pub f_files: u64,
            pub f_ffree: u64,
            pub f_fsid: ::fsid_t,
            pub f_namelen: ::__fsword_t,
            pub f_frsize: ::__fsword_t,
            pub f_flags: ::__fsword_t,
            pub f_spare: [::__fsword_t; 4],
        }

        pub struct statvfs64 {
            pub f_bsize: ::c_ulong,
            pub f_frsize: ::c_ulong,
            pub f_blocks: u64,
            pub f_bfree: u64,
            pub f_bavail: u64,
            pub f_files: u64,
            pub f_ffree: u64,
            pub f_favail: u64,
            pub f_fsid: ::c_ulong,
            pub f_flag: ::c_ulong,
            pub f_namemax: ::c_ulong,
            __f_spare: [::c_int; 6],
        }

        pub struct pthread_attr_t {
            #[cfg(target_pointer_width = "32")]
            __size: [u32; 8],
            #[cfg(target_pointer_width = "64")]
            __size: [u64; 7]
        }

        pub struct _libc_fpxreg {
            pub significand: [u16; 4],
            pub exponent: u16,
            __private: [u16; 3],
        }

        pub struct _libc_xmmreg {
            pub element: [u32; 4],
        }

        pub struct _libc_fpstate {
            pub cwd: u16,
            pub swd: u16,
            pub ftw: u16,
            pub fop: u16,
            pub rip: u64,
            pub rdp: u64,
            pub mxcsr: u32,
            pub mxcr_mask: u32,
            pub _st: [_libc_fpxreg; 8],
            pub _xmm: [_libc_xmmreg; 16],
            __private: [u64; 12],
        }

        pub struct user_regs_struct {
            pub r15: ::c_ulonglong,
            pub r14: ::c_ulonglong,
            pub r13: ::c_ulonglong,
            pub r12: ::c_ulonglong,
            pub rbp: ::c_ulonglong,
            pub rbx: ::c_ulonglong,
            pub r11: ::c_ulonglong,
            pub r10: ::c_ulonglong,
            pub r9: ::c_ulonglong,
            pub r8: ::c_ulonglong,
            pub rax: ::c_ulonglong,
            pub rcx: ::c_ulonglong,
            pub rdx: ::c_ulonglong,
            pub rsi: ::c_ulonglong,
            pub rdi: ::c_ulonglong,
            pub orig_rax: ::c_ulonglong,
            pub rip: ::c_ulonglong,
            pub cs: ::c_ulonglong,
            pub eflags: ::c_ulonglong,
            pub rsp: ::c_ulonglong,
            pub ss: ::c_ulonglong,
            pub fs_base: ::c_ulonglong,
            pub gs_base: ::c_ulonglong,
            pub ds: ::c_ulonglong,
            pub es: ::c_ulonglong,
            pub fs: ::c_ulonglong,
            pub gs: ::c_ulonglong,
        }

        pub struct user {
            pub regs: user_regs_struct,
            pub u_fpvalid: ::c_int,
            pub i387: user_fpregs_struct,
            pub u_tsize: ::c_ulonglong,
            pub u_dsize: ::c_ulonglong,
            pub u_ssize: ::c_ulonglong,
            pub start_code: ::c_ulonglong,
            pub start_stack: ::c_ulonglong,
            pub signal: ::c_longlong,
            __reserved: ::c_int,
            #[cfg(target_pointer_width = "32")]
            __pad1: u32,
            pub u_ar0: *mut user_regs_struct,
            #[cfg(target_pointer_width = "32")]
            __pad2: u32,
            pub u_fpstate: *mut user_fpregs_struct,
            pub magic: ::c_ulonglong,
            pub u_comm: [::c_char; 32],
            pub u_debugreg: [::c_ulonglong; 8],
        }

        pub struct mcontext_t {
            pub gregs: [greg_t; 23],
            pub fpregs: *mut _libc_fpstate,
            __private: [u64; 8],
        }

        pub struct ipc_perm {
            pub __key: ::key_t,
            pub uid: ::uid_t,
            pub gid: ::gid_t,
            pub cuid: ::uid_t,
            pub cgid: ::gid_t,
            pub mode: ::c_ushort,
            __pad1: ::c_ushort,
            pub __seq: ::c_ushort,
            __pad2: ::c_ushort,
            __unused1: u64,
            __unused2: u64
        }

        pub struct shmid_ds {
            pub shm_perm: ::ipc_perm,
            pub shm_segsz: ::size_t,
            pub shm_atime: ::time_t,
            pub shm_dtime: ::time_t,
            pub shm_ctime: ::time_t,
            pub shm_cpid: ::pid_t,
            pub shm_lpid: ::pid_t,
            pub shm_nattch: ::shmatt_t,
            __unused4: u64,
            __unused5: u64
        }

        pub struct seccomp_notif_sizes {
            pub seccomp_notif: ::__u16,
            pub seccomp_notif_resp: ::__u16,
            pub seccomp_data: ::__u16,
        }

        pub struct ptrace_rseq_configuration {
            pub rseq_abi_pointer: ::__u64,
            pub rseq_abi_size: ::__u32,
            pub signature: ::__u32,
            pub flags: ::__u32,
            pub pad: ::__u32,
        }
    }

    s_no_extra_traits! {
        pub struct user_fpregs_struct {
            pub cwd: ::c_ushort,
            pub swd: ::c_ushort,
            pub ftw: ::c_ushort,
            pub fop: ::c_ushort,
            pub rip: ::c_ulonglong,
            pub rdp: ::c_ulonglong,
            pub mxcsr: ::c_uint,
            pub mxcr_mask: ::c_uint,
            pub st_space: [::c_uint; 32],
            pub xmm_space: [::c_uint; 64],
            padding: [::c_uint; 24],
        }

        pub struct ucontext_t {
            pub uc_flags: ::c_ulong,
            pub uc_link: *mut ucontext_t,
            pub uc_stack: ::stack_t,
            pub uc_mcontext: mcontext_t,
            pub uc_sigmask: ::sigset_t,
            __private: [u8; 512],
            // FIXME: the shadow stack field requires glibc >= 2.28.
            // Re-add once we drop compatibility with glibc versions older than
            // 2.28.
            //
            // __ssp: [::c_ulonglong; 4],
        }
    }

    cfg_if! {
        if #[cfg(feature = "extra_traits")] {
            impl PartialEq for user_fpregs_struct {
                fn eq(&self, other: &user_fpregs_struct) -> bool {
                    self.cwd == other.cwd
                        && self.swd == other.swd
                        && self.ftw == other.ftw
                        && self.fop == other.fop
                        && self.rip == other.rip
                        && self.rdp == other.rdp
                        && self.mxcsr == other.mxcsr
                        && self.mxcr_mask == other.mxcr_mask
                        && self.st_space == other.st_space
                        && self
                        .xmm_space
                        .iter()
                        .zip(other.xmm_space.iter())
                        .all(|(a,b)| a == b)
                    // Ignore padding field
                }
            }

            impl Eq for user_fpregs_struct {}

            impl ::fmt::Debug for user_fpregs_struct {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("user_fpregs_struct")
                        .field("cwd", &self.cwd)
                        .field("ftw", &self.ftw)
                        .field("fop", &self.fop)
                        .field("rip", &self.rip)
                        .field("rdp", &self.rdp)
                        .field("mxcsr", &self.mxcsr)
                        .field("mxcr_mask", &self.mxcr_mask)
                        .field("st_space", &self.st_space)
                    // FIXME: .field("xmm_space", &self.xmm_space)
                    // Ignore padding field
                        .finish()
                }
            }

            impl ::hash::Hash for user_fpregs_struct {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.cwd.hash(state);
                    self.ftw.hash(state);
                    self.fop.hash(state);
                    self.rip.hash(state);
                    self.rdp.hash(state);
                    self.mxcsr.hash(state);
                    self.mxcr_mask.hash(state);
                    self.st_space.hash(state);
                    self.xmm_space.hash(state);
                    // Ignore padding field
                }
            }

            impl PartialEq for ucontext_t {
                fn eq(&self, other: &ucontext_t) -> bool {
                    self.uc_flags == other.uc_flags
                        && self.uc_link == other.uc_link
                        && self.uc_stack == other.uc_stack
                        && self.uc_mcontext == other.uc_mcontext
                        && self.uc_sigmask == other.uc_sigmask
                    // Ignore __private field
                }
            }

            impl Eq for ucontext_t {}

            impl ::fmt::Debug for ucontext_t {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("ucontext_t")
                        .field("uc_flags", &self.uc_flags)
                        .field("uc_link", &self.uc_link)
                        .field("uc_stack", &self.uc_stack)
                        .field("uc_mcontext", &self.uc_mcontext)
                        .field("uc_sigmask", &self.uc_sigmask)
                    // Ignore __private field
                        .finish()
                }
            }

            impl ::hash::Hash for ucontext_t {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.uc_flags.hash(state);
                    self.uc_link.hash(state);
                    self.uc_stack.hash(state);
                    self.uc_mcontext.hash(state);
                    self.uc_sigmask.hash(state);
                    // Ignore __private field
                }
            }
        }
    }

    pub const POSIX_FADV_DONTNEED: ::c_int = 4;
    pub const POSIX_FADV_NOREUSE: ::c_int = 5;

    pub const VEOF: usize = 4;
    pub const RTLD_DEEPBIND: ::c_int = 0x8;
    pub const RTLD_GLOBAL: ::c_int = 0x100;
    pub const RTLD_NOLOAD: ::c_int = 0x4;

    pub const O_APPEND: ::c_int = 1024;
    pub const O_CREAT: ::c_int = 64;
    pub const O_EXCL: ::c_int = 128;
    pub const O_NOCTTY: ::c_int = 256;
    pub const O_NONBLOCK: ::c_int = 2048;
    pub const O_SYNC: ::c_int = 1052672;
    pub const O_RSYNC: ::c_int = 1052672;
    pub const O_DSYNC: ::c_int = 4096;
    pub const O_FSYNC: ::c_int = 0x101000;
    pub const O_NOATIME: ::c_int = 0o1000000;
    pub const O_PATH: ::c_int = 0o10000000;
    pub const O_TMPFILE: ::c_int = 0o20000000 | O_DIRECTORY;

    pub const MADV_SOFT_OFFLINE: ::c_int = 101;
    pub const MAP_GROWSDOWN: ::c_int = 0x0100;

    pub const EDEADLK: ::c_int = 35;
    pub const ENAMETOOLONG: ::c_int = 36;
    pub const ENOLCK: ::c_int = 37;
    pub const ENOSYS: ::c_int = 38;
    pub const ENOTEMPTY: ::c_int = 39;
    pub const ELOOP: ::c_int = 40;
    pub const ENOMSG: ::c_int = 42;
    pub const EIDRM: ::c_int = 43;
    pub const ECHRNG: ::c_int = 44;
    pub const EL2NSYNC: ::c_int = 45;
    pub const EL3HLT: ::c_int = 46;
    pub const EL3RST: ::c_int = 47;
    pub const ELNRNG: ::c_int = 48;
    pub const EUNATCH: ::c_int = 49;
    pub const ENOCSI: ::c_int = 50;
    pub const EL2HLT: ::c_int = 51;
    pub const EBADE: ::c_int = 52;
    pub const EBADR: ::c_int = 53;
    pub const EXFULL: ::c_int = 54;
    pub const ENOANO: ::c_int = 55;
    pub const EBADRQC: ::c_int = 56;
    pub const EBADSLT: ::c_int = 57;
    pub const EMULTIHOP: ::c_int = 72;
    pub const EOVERFLOW: ::c_int = 75;
    pub const ENOTUNIQ: ::c_int = 76;
    pub const EBADFD: ::c_int = 77;
    pub const EBADMSG: ::c_int = 74;
    pub const EREMCHG: ::c_int = 78;
    pub const ELIBACC: ::c_int = 79;
    pub const ELIBBAD: ::c_int = 80;
    pub const ELIBSCN: ::c_int = 81;
    pub const ELIBMAX: ::c_int = 82;
    pub const ELIBEXEC: ::c_int = 83;
    pub const EILSEQ: ::c_int = 84;
    pub const ERESTART: ::c_int = 85;
    pub const ESTRPIPE: ::c_int = 86;
    pub const EUSERS: ::c_int = 87;
    pub const ENOTSOCK: ::c_int = 88;
    pub const EDESTADDRREQ: ::c_int = 89;
    pub const EMSGSIZE: ::c_int = 90;
    pub const EPROTOTYPE: ::c_int = 91;
    pub const ENOPROTOOPT: ::c_int = 92;
    pub const EPROTONOSUPPORT: ::c_int = 93;
    pub const ESOCKTNOSUPPORT: ::c_int = 94;
    pub const EOPNOTSUPP: ::c_int = 95;
    pub const EPFNOSUPPORT: ::c_int = 96;
    pub const EAFNOSUPPORT: ::c_int = 97;
    pub const EADDRINUSE: ::c_int = 98;
    pub const EADDRNOTAVAIL: ::c_int = 99;
    pub const ENETDOWN: ::c_int = 100;
    pub const ENETUNREACH: ::c_int = 101;
    pub const ENETRESET: ::c_int = 102;
    pub const ECONNABORTED: ::c_int = 103;
    pub const ECONNRESET: ::c_int = 104;
    pub const ENOBUFS: ::c_int = 105;
    pub const EISCONN: ::c_int = 106;
    pub const ENOTCONN: ::c_int = 107;
    pub const ESHUTDOWN: ::c_int = 108;
    pub const ETOOMANYREFS: ::c_int = 109;
    pub const ETIMEDOUT: ::c_int = 110;
    pub const ECONNREFUSED: ::c_int = 111;
    pub const EHOSTDOWN: ::c_int = 112;
    pub const EHOSTUNREACH: ::c_int = 113;
    pub const EALREADY: ::c_int = 114;
    pub const EINPROGRESS: ::c_int = 115;
    pub const ESTALE: ::c_int = 116;
    pub const EDQUOT: ::c_int = 122;
    pub const ENOMEDIUM: ::c_int = 123;
    pub const EMEDIUMTYPE: ::c_int = 124;
    pub const ECANCELED: ::c_int = 125;
    pub const ENOKEY: ::c_int = 126;
    pub const EKEYEXPIRED: ::c_int = 127;
    pub const EKEYREVOKED: ::c_int = 128;
    pub const EKEYREJECTED: ::c_int = 129;
    pub const EOWNERDEAD: ::c_int = 130;
    pub const ENOTRECOVERABLE: ::c_int = 131;
    pub const EHWPOISON: ::c_int = 133;
    pub const ERFKILL: ::c_int = 132;

    pub const SOCK_STREAM: ::c_int = 1;
    pub const SOCK_DGRAM: ::c_int = 2;

    pub const SA_ONSTACK: ::c_int = 0x08000000;
    pub const SA_SIGINFO: ::c_int = 0x00000004;
    pub const SA_NOCLDWAIT: ::c_int = 0x00000002;

    pub const SIGTTIN: ::c_int = 21;
    pub const SIGTTOU: ::c_int = 22;
    pub const SIGXCPU: ::c_int = 24;
    pub const SIGXFSZ: ::c_int = 25;
    pub const SIGVTALRM: ::c_int = 26;
    pub const SIGPROF: ::c_int = 27;
    pub const SIGWINCH: ::c_int = 28;
    pub const SIGCHLD: ::c_int = 17;
    pub const SIGBUS: ::c_int = 7;
    pub const SIGUSR1: ::c_int = 10;
    pub const SIGUSR2: ::c_int = 12;
    pub const SIGCONT: ::c_int = 18;
    pub const SIGSTOP: ::c_int = 19;
    pub const SIGTSTP: ::c_int = 20;
    pub const SIGURG: ::c_int = 23;
    pub const SIGIO: ::c_int = 29;
    pub const SIGSYS: ::c_int = 31;
    pub const SIGSTKFLT: ::c_int = 16;
    #[deprecated(since = "0.2.55", note = "Use SIGSYS instead")]
    pub const SIGUNUSED: ::c_int = 31;
    pub const SIGPOLL: ::c_int = 29;
    pub const SIGPWR: ::c_int = 30;
    pub const SIG_SETMASK: ::c_int = 2;
    pub const SIG_BLOCK: ::c_int = 0x000000;
    pub const SIG_UNBLOCK: ::c_int = 0x01;

    pub const POLLWRNORM: ::c_short = 0x100;
    pub const POLLWRBAND: ::c_short = 0x200;

    pub const O_ASYNC: ::c_int = 0x2000;
    pub const O_NDELAY: ::c_int = 0x800;

    pub const PTRACE_DETACH: ::c_uint = 17;
    pub const PTRACE_GET_RSEQ_CONFIGURATION: ::c_uint = 0x420f;

    pub const EFD_NONBLOCK: ::c_int = 0x800;

    pub const F_GETLK: ::c_int = 5;
    pub const F_GETOWN: ::c_int = 9;
    pub const F_SETOWN: ::c_int = 8;
    pub const F_SETLK: ::c_int = 6;
    pub const F_SETLKW: ::c_int = 7;
    pub const F_OFD_GETLK: ::c_int = 36;
    pub const F_OFD_SETLK: ::c_int = 37;
    pub const F_OFD_SETLKW: ::c_int = 38;

    pub const F_RDLCK: ::c_int = 0;
    pub const F_WRLCK: ::c_int = 1;
    pub const F_UNLCK: ::c_int = 2;

    pub const SFD_NONBLOCK: ::c_int = 0x0800;

    pub const TCSANOW: ::c_int = 0;
    pub const TCSADRAIN: ::c_int = 1;
    pub const TCSAFLUSH: ::c_int = 2;

    pub const SFD_CLOEXEC: ::c_int = 0x080000;

    pub const NCCS: usize = 32;

    pub const O_TRUNC: ::c_int = 512;

    pub const O_CLOEXEC: ::c_int = 0x80000;

    pub const EBFONT: ::c_int = 59;
    pub const ENOSTR: ::c_int = 60;
    pub const ENODATA: ::c_int = 61;
    pub const ETIME: ::c_int = 62;
    pub const ENOSR: ::c_int = 63;
    pub const ENONET: ::c_int = 64;
    pub const ENOPKG: ::c_int = 65;
    pub const EREMOTE: ::c_int = 66;
    pub const ENOLINK: ::c_int = 67;
    pub const EADV: ::c_int = 68;
    pub const ESRMNT: ::c_int = 69;
    pub const ECOMM: ::c_int = 70;
    pub const EPROTO: ::c_int = 71;
    pub const EDOTDOT: ::c_int = 73;

    pub const SA_NODEFER: ::c_int = 0x40000000;
    pub const SA_RESETHAND: ::c_int = 0x80000000;
    pub const SA_RESTART: ::c_int = 0x10000000;
    pub const SA_NOCLDSTOP: ::c_int = 0x00000001;

    pub const EPOLL_CLOEXEC: ::c_int = 0x80000;

    pub const EFD_CLOEXEC: ::c_int = 0x80000;

    pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
    pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;

    pub const O_DIRECT: ::c_int = 0x4000;
    pub const O_DIRECTORY: ::c_int = 0x10000;
    pub const O_NOFOLLOW: ::c_int = 0x20000;

    pub const MAP_HUGETLB: ::c_int = 0x040000;
    pub const MAP_LOCKED: ::c_int = 0x02000;
    pub const MAP_NORESERVE: ::c_int = 0x04000;
    pub const MAP_32BIT: ::c_int = 0x0040;
    pub const MAP_ANON: ::c_int = 0x0020;
    pub const MAP_ANONYMOUS: ::c_int = 0x0020;
    pub const MAP_DENYWRITE: ::c_int = 0x0800;
    pub const MAP_EXECUTABLE: ::c_int = 0x01000;
    pub const MAP_POPULATE: ::c_int = 0x08000;
    pub const MAP_NONBLOCK: ::c_int = 0x010000;
    pub const MAP_STACK: ::c_int = 0x020000;
    pub const MAP_SYNC: ::c_int = 0x080000;

    pub const EDEADLOCK: ::c_int = 35;
    pub const EUCLEAN: ::c_int = 117;
    pub const ENOTNAM: ::c_int = 118;
    pub const ENAVAIL: ::c_int = 119;
    pub const EISNAM: ::c_int = 120;
    pub const EREMOTEIO: ::c_int = 121;

    pub const PTRACE_GETFPREGS: ::c_uint = 14;
    pub const PTRACE_SETFPREGS: ::c_uint = 15;
    pub const PTRACE_GETFPXREGS: ::c_uint = 18;
    pub const PTRACE_SETFPXREGS: ::c_uint = 19;
    pub const PTRACE_GETREGS: ::c_uint = 12;
    pub const PTRACE_SETREGS: ::c_uint = 13;
    pub const PTRACE_PEEKSIGINFO_SHARED: ::c_uint = 1;
    pub const PTRACE_SYSEMU: ::c_uint = 31;
    pub const PTRACE_SYSEMU_SINGLESTEP: ::c_uint = 32;

    pub const PR_GET_SPECULATION_CTRL: ::c_int = 52;
    pub const PR_SET_SPECULATION_CTRL: ::c_int = 53;
    pub const PR_SPEC_NOT_AFFECTED: ::c_uint = 0;
    pub const PR_SPEC_PRCTL: ::c_uint = 1 << 0;
    pub const PR_SPEC_ENABLE: ::c_uint = 1 << 1;
    pub const PR_SPEC_DISABLE: ::c_uint = 1 << 2;
    pub const PR_SPEC_FORCE_DISABLE: ::c_uint = 1 << 3;
    pub const PR_SPEC_DISABLE_NOEXEC: ::c_uint = 1 << 4;
    pub const PR_SPEC_STORE_BYPASS: ::c_int = 0;
    pub const PR_SPEC_INDIRECT_BRANCH: ::c_int = 1;
    // FIXME: perharps for later
    //pub const PR_SPEC_L1D_FLUSH: ::c_int = 2;

    pub const MCL_CURRENT: ::c_int = 0x0001;
    pub const MCL_FUTURE: ::c_int = 0x0002;

    pub const SIGSTKSZ: ::size_t = 8192;
    pub const MINSIGSTKSZ: ::size_t = 2048;
    pub const CBAUD: ::tcflag_t = 0o0010017;
    pub const TAB1: ::tcflag_t = 0x00000800;
    pub const TAB2: ::tcflag_t = 0x00001000;
    pub const TAB3: ::tcflag_t = 0x00001800;
    pub const CR1: ::tcflag_t = 0x00000200;
    pub const CR2: ::tcflag_t = 0x00000400;
    pub const CR3: ::tcflag_t = 0x00000600;
    pub const FF1: ::tcflag_t = 0x00008000;
    pub const BS1: ::tcflag_t = 0x00002000;
    pub const VT1: ::tcflag_t = 0x00004000;
    pub const VWERASE: usize = 14;
    pub const VREPRINT: usize = 12;
    pub const VSUSP: usize = 10;
    pub const VSTART: usize = 8;
    pub const VSTOP: usize = 9;
    pub const VDISCARD: usize = 13;
    pub const VTIME: usize = 5;
    pub const IXON: ::tcflag_t = 0x00000400;
    pub const IXOFF: ::tcflag_t = 0x00001000;
    pub const ONLCR: ::tcflag_t = 0x4;
    pub const CSIZE: ::tcflag_t = 0x00000030;
    pub const CS6: ::tcflag_t = 0x00000010;
    pub const CS7: ::tcflag_t = 0x00000020;
    pub const CS8: ::tcflag_t = 0x00000030;
    pub const CSTOPB: ::tcflag_t = 0x00000040;
    pub const CREAD: ::tcflag_t = 0x00000080;
    pub const PARENB: ::tcflag_t = 0x00000100;
    pub const PARODD: ::tcflag_t = 0x00000200;
    pub const HUPCL: ::tcflag_t = 0x00000400;
    pub const CLOCAL: ::tcflag_t = 0x00000800;
    pub const ECHOKE: ::tcflag_t = 0x00000800;
    pub const ECHOE: ::tcflag_t = 0x00000010;
    pub const ECHOK: ::tcflag_t = 0x00000020;
    pub const ECHONL: ::tcflag_t = 0x00000040;
    pub const ECHOPRT: ::tcflag_t = 0x00000400;
    pub const ECHOCTL: ::tcflag_t = 0x00000200;
    pub const ISIG: ::tcflag_t = 0x00000001;
    pub const ICANON: ::tcflag_t = 0x00000002;
    pub const PENDIN: ::tcflag_t = 0x00004000;
    pub const NOFLSH: ::tcflag_t = 0x00000080;
    pub const CIBAUD: ::tcflag_t = 0o02003600000;
    pub const CBAUDEX: ::tcflag_t = 0o010000;
    pub const VSWTC: usize = 7;
    pub const OLCUC: ::tcflag_t = 0o000002;
    pub const NLDLY: ::tcflag_t = 0o000400;
    pub const CRDLY: ::tcflag_t = 0o003000;
    pub const TABDLY: ::tcflag_t = 0o014000;
    pub const BSDLY: ::tcflag_t = 0o020000;
    pub const FFDLY: ::tcflag_t = 0o100000;
    pub const VTDLY: ::tcflag_t = 0o040000;
    pub const XTABS: ::tcflag_t = 0o014000;

    pub const B0: ::speed_t = 0o000000;
    pub const B50: ::speed_t = 0o000001;
    pub const B75: ::speed_t = 0o000002;
    pub const B110: ::speed_t = 0o000003;
    pub const B134: ::speed_t = 0o000004;
    pub const B150: ::speed_t = 0o000005;
    pub const B200: ::speed_t = 0o000006;
    pub const B300: ::speed_t = 0o000007;
    pub const B600: ::speed_t = 0o000010;
    pub const B1200: ::speed_t = 0o000011;
    pub const B1800: ::speed_t = 0o000012;
    pub const B2400: ::speed_t = 0o000013;
    pub const B4800: ::speed_t = 0o000014;
    pub const B9600: ::speed_t = 0o000015;
    pub const B19200: ::speed_t = 0o000016;
    pub const B38400: ::speed_t = 0o000017;
    pub const EXTA: ::speed_t = B19200;
    pub const EXTB: ::speed_t = B38400;
    pub const B57600: ::speed_t = 0o010001;
    pub const B115200: ::speed_t = 0o010002;
    pub const B230400: ::speed_t = 0o010003;
    pub const B460800: ::speed_t = 0o010004;
    pub const B500000: ::speed_t = 0o010005;
    pub const B576000: ::speed_t = 0o010006;
    pub const B921600: ::speed_t = 0o010007;
    pub const B1000000: ::speed_t = 0o010010;
    pub const B1152000: ::speed_t = 0o010011;
    pub const B1500000: ::speed_t = 0o010012;
    pub const B2000000: ::speed_t = 0o010013;
    pub const B2500000: ::speed_t = 0o010014;
    pub const B3000000: ::speed_t = 0o010015;
    pub const B3500000: ::speed_t = 0o010016;
    pub const B4000000: ::speed_t = 0o010017;

    pub const VEOL: usize = 11;
    pub const VEOL2: usize = 16;
    pub const VMIN: usize = 6;
    pub const IEXTEN: ::tcflag_t = 0x00008000;
    pub const TOSTOP: ::tcflag_t = 0x00000100;
    pub const FLUSHO: ::tcflag_t = 0x00001000;
    pub const EXTPROC: ::tcflag_t = 0x00010000;

    // offsets in user_regs_structs, from sys/reg.h
    pub const R15: ::c_int = 0;
    pub const R14: ::c_int = 1;
    pub const R13: ::c_int = 2;
    pub const R12: ::c_int = 3;
    pub const RBP: ::c_int = 4;
    pub const RBX: ::c_int = 5;
    pub const R11: ::c_int = 6;
    pub const R10: ::c_int = 7;
    pub const R9: ::c_int = 8;
    pub const R8: ::c_int = 9;
    pub const RAX: ::c_int = 10;
    pub const RCX: ::c_int = 11;
    pub const RDX: ::c_int = 12;
    pub const RSI: ::c_int = 13;
    pub const RDI: ::c_int = 14;
    pub const ORIG_RAX: ::c_int = 15;
    pub const RIP: ::c_int = 16;
    pub const CS: ::c_int = 17;
    pub const EFLAGS: ::c_int = 18;
    pub const RSP: ::c_int = 19;
    pub const SS: ::c_int = 20;
    pub const FS_BASE: ::c_int = 21;
    pub const GS_BASE: ::c_int = 22;
    pub const DS: ::c_int = 23;
    pub const ES: ::c_int = 24;
    pub const FS: ::c_int = 25;
    pub const GS: ::c_int = 26;

    // offsets in mcontext_t.gregs from sys/ucontext.h
    pub const REG_R8: ::c_int = 0;
    pub const REG_R9: ::c_int = 1;
    pub const REG_R10: ::c_int = 2;
    pub const REG_R11: ::c_int = 3;
    pub const REG_R12: ::c_int = 4;
    pub const REG_R13: ::c_int = 5;
    pub const REG_R14: ::c_int = 6;
    pub const REG_R15: ::c_int = 7;
    pub const REG_RDI: ::c_int = 8;
    pub const REG_RSI: ::c_int = 9;
    pub const REG_RBP: ::c_int = 10;
    pub const REG_RBX: ::c_int = 11;
    pub const REG_RDX: ::c_int = 12;
    pub const REG_RAX: ::c_int = 13;
    pub const REG_RCX: ::c_int = 14;
    pub const REG_RSP: ::c_int = 15;
    pub const REG_RIP: ::c_int = 16;
    pub const REG_EFL: ::c_int = 17;
    pub const REG_CSGSFS: ::c_int = 18;
    pub const REG_ERR: ::c_int = 19;
    pub const REG_TRAPNO: ::c_int = 20;
    pub const REG_OLDMASK: ::c_int = 21;
    pub const REG_CR2: ::c_int = 22;

    pub const SECCOMP_SET_MODE_STRICT: ::c_uint = 0;
    pub const SECCOMP_SET_MODE_FILTER: ::c_uint = 1;
    pub const SECCOMP_GET_ACTION_AVAIL: ::c_uint = 2;
    pub const SECCOMP_GET_NOTIF_SIZES: ::c_uint = 3;

    extern "C" {
        pub fn getcontext(ucp: *mut ucontext_t) -> ::c_int;
        pub fn setcontext(ucp: *const ucontext_t) -> ::c_int;
        pub fn makecontext(ucp: *mut ucontext_t, func: extern "C" fn(), argc: ::c_int, ...);
        pub fn swapcontext(uocp: *mut ucontext_t, ucp: *const ucontext_t) -> ::c_int;
        pub fn iopl(level: ::c_int) -> ::c_int;
        pub fn ioperm(from: ::c_ulong, num: ::c_ulong, turn_on: ::c_int) -> ::c_int;
    }

    cfg_if! {
        if #[cfg(target_pointer_width = "32")] {
            mod x32;
            pub use self::x32::*;
        } else {
            mod not_x32;
            pub use self::not_x32::*;
        }
    }

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