diff --git a/build.rs b/build.rs
index fb0341ef88c11..eb602cd37a491 100644
--- a/build.rs
+++ b/build.rs
@@ -24,7 +24,9 @@ const ALLOWED_CFGS: &'static [&'static str] = &[
 const CHECK_CFG_EXTRA: &'static [(&'static str, &'static [&'static str])] = &[
     (
         "target_os",
-        &["switch", "aix", "ohos", "hurd", "rtems", "visionos"],
+        &[
+            "switch", "aix", "ohos", "hurd", "rtems", "visionos", "nuttx",
+        ],
     ),
     ("target_env", &["illumos", "wasi", "aix", "ohos"]),
     (
diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 1e6daface673a..6c1656b9a41d5 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -326,8 +326,11 @@ extern "C" {
 }
 
 cfg_if! {
-    if #[cfg(any(target_os = "l4re", target_os = "espidf"))] {
-        // required libraries for L4Re and the ESP-IDF framework are linked externally, ATM
+    if #[cfg(any(target_os = "l4re", target_os = "espidf", target_os = "nuttx"))] {
+        // required libraries are linked externally for these platforms:
+        // * L4Re
+        // * ESP-IDF
+        // * NuttX
     } else if #[cfg(feature = "std")] {
         // cargo build, don't pull in anything extra as the std dep
         // already pulls in all libs.
@@ -1610,6 +1613,9 @@ cfg_if! {
     } else if #[cfg(target_os = "hurd")] {
         mod hurd;
         pub use self::hurd::*;
+    } else if #[cfg(target_os = "nuttx")] {
+        mod nuttx;
+        pub use self::nuttx::*;
     } else {
         // Unknown target_os
     }
diff --git a/src/unix/nuttx/mod.rs b/src/unix/nuttx/mod.rs
new file mode 100644
index 0000000000000..e3a3c15b338cc
--- /dev/null
+++ b/src/unix/nuttx/mod.rs
@@ -0,0 +1,555 @@
+use c_void;
+use in6_addr;
+use in_addr_t;
+use timespec;
+use DIR;
+
+pub type nlink_t = u16;
+pub type ino_t = u16;
+pub type blkcnt_t = u64;
+pub type blksize_t = i16;
+pub type c_char = i8;
+pub type c_long = isize;
+pub type c_ulong = usize;
+pub type cc_t = u8;
+pub type clock_t = i64;
+pub type dev_t = i32;
+pub type fsblkcnt_t = u64;
+pub type locale_t = *mut i8;
+pub type mode_t = u32;
+pub type nfds_t = u32;
+pub type off_t = i64;
+pub type pthread_key_t = i32;
+pub type pthread_mutexattr_t = u8;
+pub type pthread_rwlockattr_t = i32;
+pub type pthread_t = i32;
+pub type rlim_t = i64;
+pub type sa_family_t = u16;
+pub type socklen_t = u32;
+pub type speed_t = usize;
+pub type suseconds_t = i32;
+pub type tcflag_t = u32;
+pub type clockid_t = i32;
+pub type time_t = i64;
+pub type wchar_t = i32;
+
+s! {
+    pub struct stat {
+        pub st_dev: dev_t,
+        pub st_ino: ino_t,
+        pub st_mode: mode_t,
+        pub st_nlink: u64,
+        pub st_uid: u32,
+        pub st_gid: u32,
+        pub st_rdev: dev_t,
+        pub st_size: off_t,
+        pub st_atim: timespec,
+        pub st_mtim: timespec,
+        pub st_ctim: timespec,
+        pub st_blksize: blksize_t,
+        pub st_blocks: i64,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct sockaddr {
+        pub sa_family: sa_family_t,
+        pub sa_data: [u8; 14],
+    }
+
+    pub struct passwd {
+        pub pw_name: *const c_char,
+        pub pw_uid: u32,
+        pub pw_gid: u32,
+        pub pw_gecos: *const c_char,
+        pub pw_dir: *const c_char,
+        pub pw_shell: *const c_char,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__]
+    }
+
+    pub struct sem_t { __val: [usize; __SEM_SIZE__] }
+
+    pub struct pthread_attr_t { __val: [usize; __PTHREAD_ATTR_SIZE__] }
+
+    pub struct pthread_mutex_t { __val: [usize; __PTHREAD_MUTEX_SIZE__] }
+
+    pub struct pthread_cond_t { __val: [usize; __PTHREAD_COND_SIZE__] }
+
+    pub struct pthread_condattr_t { __val: [usize; __PTHREAD_CONDATTR_SIZE__] }
+
+    pub struct Dl_info {
+        pub dli_fname: *const c_char,
+        pub dli_fbase: *mut c_void,
+        pub dli_sname: *const c_char,
+        pub dli_saddr: *mut c_void,
+    }
+
+    pub struct lconv {
+        pub decimal_point: *const c_char,
+        pub thousands_sep: *const c_char,
+        pub grouping: *const c_char,
+        pub int_curr_symbol: *const c_char,
+        pub currency_symbol: *const c_char,
+        pub mon_decimal_point: *const c_char,
+        pub mon_thousands_sep: *const c_char,
+        pub mon_grouping: *const c_char,
+        pub positive_sign: *const c_char,
+        pub negative_sign: *const c_char,
+        pub int_frac_digits: i8,
+        pub frac_digits: i8,
+        pub p_cs_precedes: i8,
+        pub p_sep_by_space: i8,
+        pub n_cs_precedes: i8,
+        pub n_sep_by_space: i8,
+        pub p_sign_posn: i8,
+        pub n_sign_posn: i8,
+        pub int_n_cs_precedes: i8,
+        pub int_n_sep_by_space: i8,
+        pub int_n_sign_posn: i8,
+        pub int_p_cs_precedes: i8,
+        pub int_p_sep_by_space: i8,
+        pub int_p_sign_posn: i8,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct tm {
+        pub tm_sec: i32,
+        pub tm_min: i32,
+        pub tm_hour: i32,
+        pub tm_mday: i32,
+        pub tm_mon: i32,
+        pub tm_year: i32,
+        pub tm_wday: i32,
+        pub tm_yday: i32,
+        pub tm_isdst: i32,
+        pub tm_gmtoff: isize,
+        pub tm_zone: *const i8,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct addrinfo {
+        pub ai_flags: i32,
+        pub ai_family: i32,
+        pub ai_socktype: i32,
+        pub ai_protocol: i32,
+        pub ai_addrlen: socklen_t,
+        pub ai_addr: *mut sockaddr,
+        pub ai_canonname: *mut c_char,
+        pub ai_next: *mut addrinfo,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct pthread_rwlock_t {
+        __val: [usize; __PTHREAD_RWLOCK_SIZE__],
+    }
+
+    pub struct statvfs {
+        pub f_bsize: usize,
+        pub f_frsize: usize,
+        pub f_blocks: fsblkcnt_t,
+        pub f_bfree: fsblkcnt_t,
+        pub f_bavail: fsblkcnt_t,
+        pub f_files: fsblkcnt_t,
+        pub f_ffree: fsblkcnt_t,
+        pub f_favail: fsblkcnt_t,
+        pub f_fsid: usize,
+        pub f_flag: usize,
+        pub f_namemax: usize,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct dirent {
+        pub d_type: u8,
+        pub d_name: [i8; __NAME_MAX__ + 1],
+    }
+
+    pub struct fd_set {
+        __val: [u32; __FDSET_SIZE__],
+    }
+
+    pub struct sigset_t {
+        __val: [u32; __SIGSET_SIZE__],
+    }
+
+    pub struct sigaction {
+        pub sa_handler: usize,
+        pub sa_mask: sigset_t,
+        pub sa_flags: i32,
+        pub sa_user: usize,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    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_cc: [cc_t; 12],
+        pub c_speed: speed_t,
+        __reserved: [usize; __DEFAULT_RESERVED_SIZE__],
+    }
+
+    pub struct in_addr {
+        pub s_addr: in_addr_t,
+    }
+
+    pub struct sockaddr_in {
+        pub sin_family: sa_family_t,
+        pub sin_port: ::in_port_t,
+        pub sin_addr: ::in_addr,
+        pub sin_zero: [u8; 8],
+    }
+
+    pub struct sockaddr_in6 {
+        pub sin6_family: sa_family_t,
+        pub sin6_port: ::in_port_t,
+        pub sin6_flowinfo: u32,
+        pub sin6_addr: ::in6_addr,
+        pub sin6_scope_id: u32,
+    }
+
+    pub struct sockaddr_un {
+        pub sun_family: sa_family_t,
+        pub sun_path: [c_char; 108],
+    }
+
+    pub struct sockaddr_storage {
+        pub ss_family: sa_family_t,
+        ss_data: [u32; __SOCKADDR_STORAGE_SIZE__],
+    }
+
+    pub struct ip_mreq {
+        pub imr_multiaddr: in_addr,
+        pub imr_interface: in_addr,
+    }
+
+    pub struct ipv6_mreq {
+        pub ipv6mr_multiaddr: in6_addr,
+        pub ipv6mr_interface: u32,
+    }
+
+    pub struct timeval {
+        pub tv_sec: time_t,
+        pub tv_usec: suseconds_t,
+    }
+}
+
+// Reserved two pointer size for reserved area for some structures.
+// This ensures that the size of these structures is large enough
+// if more fields are added in the NuttX side.
+//
+// These structures are that defined by POSIX but only necessary fields are included,
+// for example, struct passwd, https://pubs.opengroup.org/onlinepubs/009695399/basedefs/pwd.h.html,
+// POSIX only defines following fields in struct passwd:
+// char    *pw_name   User's login name.
+// uid_t    pw_uid    Numerical user ID.
+// gid_t    pw_gid    Numerical group ID.
+// char    *pw_dir    Initial working directory.
+// char    *pw_shell  Program to use as shell.
+// Other fields can be different depending on the implementation.
+
+const __DEFAULT_RESERVED_SIZE__: usize = 2;
+
+const __SOCKADDR_STORAGE_SIZE__: usize = 36;
+const __PTHREAD_ATTR_SIZE__: usize = 5;
+const __PTHREAD_MUTEX_SIZE__: usize = 9;
+const __PTHREAD_COND_SIZE__: usize = 7;
+const __PTHREAD_CONDATTR_SIZE__: usize = 5;
+const __PTHREAD_RWLOCK_SIZE__: usize = 17;
+const __SEM_SIZE__: usize = 6;
+const __NAME_MAX__: usize = 64;
+const __FDSET_SIZE__: usize = 10;
+const __SIGSET_SIZE__: usize = 8;
+
+pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
+    __val: [0; __PTHREAD_COND_SIZE__],
+};
+pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
+    __val: [0; __PTHREAD_MUTEX_SIZE__],
+};
+
+// dlfcn.h
+pub const RTLD_DEFAULT: *mut c_void = 0 as *mut c_void;
+
+// stdlib.h
+pub const EXIT_SUCCESS: i32 = 0;
+pub const EXIT_FAILURE: i32 = 1;
+
+// time.h
+pub const CLOCK_REALTIME: i32 = 0;
+pub const CLOCK_MONOTONIC: i32 = 1;
+
+// errno.h
+pub const EPERM: i32 = 1;
+pub const ENOENT: i32 = 2;
+pub const ESRCH: i32 = 3;
+pub const EINTR: i32 = 4;
+pub const EIO: i32 = 5;
+pub const ENXIO: i32 = 6;
+pub const E2BIG: i32 = 7;
+pub const ENOEXEC: i32 = 8;
+pub const EBADF: i32 = 9;
+pub const ECHILD: i32 = 10;
+pub const EAGAIN: i32 = 11;
+pub const ENOMEM: i32 = 12;
+pub const EACCES: i32 = 13;
+pub const EFAULT: i32 = 14;
+pub const ENOTBLK: i32 = 15;
+pub const EBUSY: i32 = 16;
+pub const EEXIST: i32 = 17;
+pub const EXDEV: i32 = 18;
+pub const ENODEV: i32 = 19;
+pub const ENOTDIR: i32 = 20;
+pub const EISDIR: i32 = 21;
+pub const EINVAL: i32 = 22;
+pub const ENFILE: i32 = 23;
+pub const EMFILE: i32 = 24;
+pub const ENOTTY: i32 = 25;
+pub const ETXTBSY: i32 = 26;
+pub const EFBIG: i32 = 27;
+pub const ENOSPC: i32 = 28;
+pub const ESPIPE: i32 = 29;
+pub const EROFS: i32 = 30;
+pub const EMLINK: i32 = 31;
+pub const EPIPE: i32 = 32;
+pub const EDOM: i32 = 33;
+pub const ERANGE: i32 = 34;
+pub const EDEADLK: i32 = 35;
+pub const ENAMETOOLONG: i32 = 36;
+pub const ENOLCK: i32 = 37;
+pub const ENOSYS: i32 = 38;
+pub const ENOTEMPTY: i32 = 39;
+pub const ELOOP: i32 = 40;
+pub const EWOULDBLOCK: i32 = EAGAIN;
+pub const ENOMSG: i32 = 42;
+pub const EIDRM: i32 = 43;
+pub const ECHRNG: i32 = 44;
+pub const EL2NSYNC: i32 = 45;
+pub const EL3HLT: i32 = 46;
+pub const EL3RST: i32 = 47;
+pub const ELNRNG: i32 = 48;
+pub const EUNATCH: i32 = 49;
+pub const ENOCSI: i32 = 50;
+pub const EL2HLT: i32 = 51;
+pub const EBADE: i32 = 52;
+pub const EBADR: i32 = 53;
+pub const EXFULL: i32 = 54;
+pub const ENOANO: i32 = 55;
+pub const EBADRQC: i32 = 56;
+pub const EBADSLT: i32 = 57;
+pub const EDEADLOCK: i32 = EDEADLK;
+pub const EBFONT: i32 = 59;
+pub const ENOSTR: i32 = 60;
+pub const ENODATA: i32 = 61;
+pub const ETIME: i32 = 62;
+pub const ENOSR: i32 = 63;
+pub const ENONET: i32 = 64;
+pub const ENOPKG: i32 = 65;
+pub const EREMOTE: i32 = 66;
+pub const ENOLINK: i32 = 67;
+pub const EADV: i32 = 68;
+pub const ESRMNT: i32 = 69;
+pub const ECOMM: i32 = 70;
+pub const EPROTO: i32 = 71;
+pub const EMULTIHOP: i32 = 72;
+pub const EDOTDOT: i32 = 73;
+pub const EBADMSG: i32 = 74;
+pub const EOVERFLOW: i32 = 75;
+pub const ENOTUNIQ: i32 = 76;
+pub const EBADFD: i32 = 77;
+pub const EREMCHG: i32 = 78;
+pub const ELIBACC: i32 = 79;
+pub const ELIBBAD: i32 = 80;
+pub const ELIBSCN: i32 = 81;
+pub const ELIBMAX: i32 = 82;
+pub const ELIBEXEC: i32 = 83;
+pub const EILSEQ: i32 = 84;
+pub const ERESTART: i32 = 85;
+pub const ESTRPIPE: i32 = 86;
+pub const EUSERS: i32 = 87;
+pub const ENOTSOCK: i32 = 88;
+pub const EDESTADDRREQ: i32 = 89;
+pub const EMSGSIZE: i32 = 90;
+pub const EPROTOTYPE: i32 = 91;
+pub const ENOPROTOOPT: i32 = 92;
+pub const EPROTONOSUPPORT: i32 = 93;
+pub const ESOCKTNOSUPPORT: i32 = 94;
+pub const EOPNOTSUPP: i32 = 95;
+pub const EPFNOSUPPORT: i32 = 96;
+pub const EAFNOSUPPORT: i32 = 97;
+pub const EADDRINUSE: i32 = 98;
+pub const EADDRNOTAVAIL: i32 = 99;
+pub const ENETDOWN: i32 = 100;
+pub const ENETUNREACH: i32 = 101;
+pub const ENETRESET: i32 = 102;
+pub const ECONNABORTED: i32 = 103;
+pub const ECONNRESET: i32 = 104;
+pub const ENOBUFS: i32 = 105;
+pub const EISCONN: i32 = 106;
+pub const ENOTCONN: i32 = 107;
+pub const ESHUTDOWN: i32 = 108;
+pub const ETOOMANYREFS: i32 = 109;
+pub const ETIMEDOUT: i32 = 110;
+pub const ECONNREFUSED: i32 = 111;
+pub const EHOSTDOWN: i32 = 112;
+pub const EHOSTUNREACH: i32 = 113;
+pub const EALREADY: i32 = 114;
+pub const EINPROGRESS: i32 = 115;
+pub const ESTALE: i32 = 116;
+pub const EUCLEAN: i32 = 117;
+pub const ENOTNAM: i32 = 118;
+pub const ENAVAIL: i32 = 119;
+pub const EISNAM: i32 = 120;
+pub const EREMOTEIO: i32 = 121;
+pub const EDQUOT: i32 = 122;
+pub const ENOMEDIUM: i32 = 123;
+pub const EMEDIUMTYPE: i32 = 124;
+pub const ECANCELED: i32 = 125;
+pub const ENOKEY: i32 = 126;
+pub const EKEYEXPIRED: i32 = 127;
+pub const EKEYREVOKED: i32 = 128;
+pub const EKEYREJECTED: i32 = 129;
+pub const EOWNERDEAD: i32 = 130;
+pub const ENOTRECOVERABLE: i32 = 131;
+pub const ERFKILL: i32 = 132;
+pub const EHWPOISON: i32 = 133;
+pub const ELBIN: i32 = 134;
+pub const EFTYPE: i32 = 135;
+pub const ENMFILE: i32 = 136;
+pub const EPROCLIM: i32 = 137;
+pub const ENOTSUP: i32 = 138;
+pub const ENOSHARE: i32 = 139;
+pub const ECASECLASH: i32 = 140;
+
+// fcntl.h
+pub const FIOCLEX: i32 = 0x30b;
+pub const F_SETFL: i32 = 0x9;
+pub const F_DUPFD_CLOEXEC: i32 = 0x12;
+pub const F_GETFD: i32 = 0x1;
+pub const F_GETFL: i32 = 0x2;
+pub const O_RDONLY: i32 = 0x1;
+pub const O_WRONLY: i32 = 0x2;
+pub const O_RDWR: i32 = 0x3;
+pub const O_CREAT: i32 = 0x4;
+pub const O_EXCL: i32 = 0x8;
+pub const O_NOCTTY: i32 = 0x0;
+pub const O_TRUNC: i32 = 0x20;
+pub const O_APPEND: i32 = 0x10;
+pub const O_NONBLOCK: i32 = 0x40;
+pub const O_DSYNC: i32 = 0x80;
+pub const O_DIRECT: i32 = 0x200;
+pub const O_LARGEFILE: i32 = 0x2000;
+pub const O_DIRECTORY: i32 = 0x800;
+pub const O_NOFOLLOW: i32 = 0x1000;
+pub const O_NOATIME: i32 = 0x40000;
+pub const O_CLOEXEC: i32 = 0x400;
+pub const O_ACCMODE: i32 = 0x0003;
+pub const AT_FDCWD: i32 = -100;
+pub const AT_REMOVEDIR: i32 = 0x200;
+
+// sys/types.h
+pub const SEEK_SET: i32 = 0;
+pub const SEEK_CUR: i32 = 1;
+pub const SEEK_END: i32 = 2;
+
+// sys/stat.h
+pub const S_IFDIR: u32 = 0x4000;
+pub const S_IFLNK: u32 = 0xA000;
+pub const S_IFREG: u32 = 0x8000;
+pub const S_IFMT: u32 = 0xF000;
+pub const S_IFIFO: u32 = 0x1000;
+pub const S_IFSOCK: u32 = 0xc000;
+pub const S_IFBLK: u32 = 0x6000;
+pub const S_IFCHR: u32 = 0x2000;
+pub const S_IRUSR: u32 = 0x100;
+pub const S_IWUSR: u32 = 0x80;
+pub const S_IXUSR: u32 = 0x40;
+pub const S_IRGRP: u32 = 0x20;
+pub const S_IWGRP: u32 = 0x10;
+pub const S_IXGRP: u32 = 0x8;
+pub const S_IROTH: u32 = 0x004;
+pub const S_IWOTH: u32 = 0x002;
+pub const S_IXOTH: u32 = 0x001;
+
+// sys/poll.h
+pub const POLLIN: i16 = 0x01;
+pub const POLLOUT: i16 = 0x04;
+pub const POLLHUP: i16 = 0x10;
+pub const POLLERR: i16 = 0x08;
+pub const POLLNVAL: i16 = 0x20;
+
+// sys/socket.h
+pub const AF_UNIX: i32 = 1;
+pub const SOCK_DGRAM: i32 = 2;
+pub const SOCK_STREAM: i32 = 1;
+pub const AF_INET: i32 = 2;
+pub const AF_INET6: i32 = 10;
+pub const MSG_PEEK: i32 = 0x02;
+pub const SOL_SOCKET: i32 = 1;
+pub const SHUT_WR: i32 = 2;
+pub const SHUT_RD: i32 = 1;
+pub const SHUT_RDWR: i32 = 3;
+pub const SO_ERROR: i32 = 4;
+pub const SO_REUSEADDR: i32 = 11;
+pub const SOMAXCONN: i32 = 8;
+pub const SO_LINGER: i32 = 6;
+pub const SO_RCVTIMEO: i32 = 0xa;
+pub const SO_SNDTIMEO: i32 = 0xe;
+pub const SO_BROADCAST: i32 = 1;
+
+// netinet/tcp.h
+pub const TCP_NODELAY: i32 = 0x10;
+
+// nuttx/fs/ioctl.h
+pub const FIONBIO: i32 = 0x30a;
+
+// unistd.h
+pub const STDIN_FILENO: i32 = 0;
+pub const STDOUT_FILENO: i32 = 1;
+pub const STDERR_FILENO: i32 = 2;
+pub const _SC_PAGESIZE: i32 = 0x36;
+pub const _SC_THREAD_STACK_MIN: i32 = 0x58;
+pub const _SC_GETPW_R_SIZE_MAX: i32 = 0x25;
+
+// signal.h
+pub const SIGPIPE: i32 = 13;
+
+// pthread.h
+pub const PTHREAD_MUTEX_NORMAL: i32 = 0;
+
+// netinet/in.h
+pub const IP_TTL: i32 = 0x1e;
+pub const IPV6_V6ONLY: i32 = 0x17;
+pub const IPV6_JOIN_GROUP: i32 = 0x11;
+pub const IPV6_LEAVE_GROUP: i32 = 0x12;
+pub const IP_MULTICAST_LOOP: i32 = 0x13;
+pub const IPV6_MULTICAST_LOOP: i32 = 0x15;
+pub const IP_MULTICAST_TTL: i32 = 0x12;
+pub const IP_ADD_MEMBERSHIP: i32 = 0x14;
+pub const IP_DROP_MEMBERSHIP: i32 = 0x15;
+
+extern "C" {
+    pub fn bind(sockfd: i32, addr: *const sockaddr, addrlen: socklen_t) -> i32;
+    pub fn ioctl(fd: i32, request: i32, ...) -> i32;
+    pub fn dirfd(dirp: *mut DIR) -> i32;
+    pub fn recvfrom(
+        sockfd: i32,
+        buf: *mut c_void,
+        len: usize,
+        flags: i32,
+        src_addr: *mut sockaddr,
+        addrlen: *mut socklen_t,
+    ) -> i32;
+
+    pub fn pthread_create(
+        thread: *mut pthread_t,
+        attr: *const pthread_attr_t,
+        start_routine: extern "C" fn(*mut c_void) -> *mut c_void,
+        arg: *mut c_void,
+    ) -> i32;
+
+    pub fn clock_gettime(clockid: clockid_t, tp: *mut timespec) -> i32;
+    pub fn futimens(fd: i32, times: *const timespec) -> i32;
+    pub fn pthread_condattr_setclock(attr: *mut pthread_condattr_t, clock_id: clockid_t) -> i32;
+    pub fn pthread_set_name_np(thread: pthread_t, name: *const c_char) -> i32;
+    pub fn getrandom(buf: *mut c_void, buflen: usize, flags: u32) -> isize;
+}