Auto merge of #646 - FenrirWolf:newlib, r=alexcrichton

Add experimental newlib bindings

I'm not sure how much desire there is for something like this in the libc crate, but I've been working with a newlib-based toolchain for a while and thought I'd throw this PR up and see what happens.

These bindings are more specifically targeted towards the devkitARM toolchain from http://devkitpro.org rather than newlib in general. I'd be happy to try making things more platform and toolchain-agnostic, but I'm not completely sure what the best way to do that is. I can move more of the arch-specific bindings to the `arm` folder, but should there also be a `devkitarm` subdirectory to further separate specific bindings from other newlib implementations?

There's also the question of if the bindings should live in the `unix` directory in the first place. Newlib aims to provide a unix/posix-like environment and it would be nice to inherit common unix definitions by default, but it can target anything from embedded devices to custom userlands, and as such it often lacks APIs that are common in other libc variants, such as pthreads.

3 files changed, 616 insertions, 0 deletions

diff --git a/src/unix/mod.rs b/src/unix/mod.rs
index 82583b8523..2e6aae4bbd 100644
--- a/src/unix/mod.rs
+++ b/src/unix/mod.rs
@@ -252,6 +252,10 @@ cfg_if! {
         #[link(name = "c")]
         #[link(name = "mxio")]
         extern {}
+    } else if #[cfg(target_env = "newlib")] {
+        #[link(name = "c")]
+        #[link(name = "m")]
+        extern {}
     } else {
         #[link(name = "c")]
         #[link(name = "m")]
@@ -888,6 +892,9 @@ cfg_if! {
     if #[cfg(target_env = "uclibc")] {
         mod uclibc;
         pub use self::uclibc::*;
+    } else if #[cfg(target_env = "newlib")] {
+        mod newlib;
+        pub use self::newlib::*;
     } else if #[cfg(any(target_os = "linux",
                         target_os = "android",
                         target_os = "emscripten",
diff --git a/src/unix/newlib/arm/mod.rs b/src/unix/newlib/arm/mod.rs
new file mode 100644
index 0000000000..372a48c4b4
--- /dev/null
+++ b/src/unix/newlib/arm/mod.rs
@@ -0,0 +1,5 @@
+pub type c_char = u8;
+pub type wchar_t = u32;
+
+pub type c_long = i32;
+pub type c_ulong = u32;
diff --git a/src/unix/newlib/mod.rs b/src/unix/newlib/mod.rs
new file mode 100644
index 0000000000..1929bb795f
--- /dev/null
+++ b/src/unix/newlib/mod.rs
@@ -0,0 +1,604 @@
+use dox::mem;
+
+pub type blkcnt_t = i32;
+pub type blksize_t = i32;
+pub type clock_t = i32;
+pub type clockid_t = ::c_ulong;
+pub type dev_t = u32;
+pub type fsblkcnt_t = u64;
+pub type fsfilcnt_t = u32;
+pub type id_t = u32;
+pub type ino_t = u32;
+pub type key_t = ::c_int;
+pub type loff_t = ::c_longlong;
+pub type mode_t = ::c_uint;
+pub type nfds_t = u32;
+pub type nlink_t = ::c_ushort;
+pub type off_t = i64;
+pub type pthread_t = ::c_ulong;
+pub type pthread_key_t = ::c_uint;
+pub type rlim_t = u32;
+pub type sa_family_t = u8;
+pub type socklen_t = u32;
+pub type speed_t = u32;
+pub type suseconds_t = i32;
+pub type tcflag_t = ::c_uint;
+pub type time_t = i32;
+pub type useconds_t = u32;
+
+s! {
+    pub struct sockaddr {
+        pub sa_family: sa_family_t,
+        pub sa_data: [::c_char; 14],
+    }
+
+    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 { // Unverified
+        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_storage {
+        pub ss_family: sa_family_t,
+        pub __ss_padding: [u8; 26],
+    }
+
+    pub struct addrinfo {
+        pub ai_flags: ::c_int,
+        pub ai_family: ::c_int,
+        pub ai_socktype: ::c_int,
+        pub ai_protocol: ::c_int,
+        pub ai_addrlen: socklen_t,
+        pub ai_canonname: *mut ::c_char,
+        pub ai_addr: *mut sockaddr,
+        pub ai_next: *mut addrinfo,
+    }
+
+    pub struct ip_mreq {
+        pub imr_multiaddr: in_addr,
+        pub imr_interface: in_addr,
+    }
+
+    pub struct linger {
+        pub l_onoff: ::c_int,
+        pub l_linger: ::c_int,
+    }
+
+    pub struct in_addr {
+            pub s_addr: ::in_addr_t,
+    }
+
+    pub struct hostent {
+            pub h_name: *mut ::c_char,
+            pub h_aliases: *mut *mut ::c_char,
+            pub h_addrtype: ::c_int,
+            pub h_length: ::c_int,
+            pub h_addr_list: *mut *mut ::c_char,
+            pub h_addr: *mut ::c_char,
+    }
+
+    pub struct pollfd {
+        pub fd: ::c_int,
+        pub events: ::c_int,
+        pub revents: ::c_int,
+    }
+
+    pub struct lconv {
+        pub decimal_point: *mut ::c_char,
+        pub thousands_sep: *mut ::c_char,
+        pub grouping: *mut ::c_char,
+        pub int_curr_symbol: *mut ::c_char,
+        pub currency_symbol: *mut ::c_char,
+        pub mon_decimal_point: *mut ::c_char,
+        pub mon_thousands_sep: *mut ::c_char,
+        pub mon_grouping: *mut ::c_char,
+        pub positive_sign: *mut ::c_char,
+        pub negative_sign: *mut ::c_char,
+        pub int_frac_digits: ::c_char,
+        pub frac_digits: ::c_char,
+        pub p_cs_precedes: ::c_char,
+        pub p_sep_by_space: ::c_char,
+        pub n_cs_precedes: ::c_char,
+        pub n_sep_by_space: ::c_char,
+        pub p_sign_posn: ::c_char,
+        pub n_sign_posn: ::c_char,
+        pub int_n_cs_precedes: ::c_char,
+        pub int_n_sep_by_space: ::c_char,
+        pub int_n_sign_posn: ::c_char,
+        pub int_p_cs_precedes: ::c_char,
+        pub int_p_sep_by_space: ::c_char,
+        pub int_p_sign_posn: ::c_char,
+    }
+
+    pub struct tm {
+        pub tm_sec: ::c_int,
+        pub tm_min: ::c_int,
+        pub tm_hour: ::c_int,
+        pub tm_mday: ::c_int,
+        pub tm_mon: ::c_int,
+        pub tm_year: ::c_int,
+        pub tm_wday: ::c_int,
+        pub tm_yday: ::c_int,
+        pub tm_isdst: ::c_int,
+    }
+
+    pub struct stat {
+        pub st_dev: ::dev_t,
+        pub st_ino: ::ino_t,
+        pub st_mode: ::mode_t,
+        pub st_nlink: ::nlink_t,
+        pub st_uid: ::uid_t,
+        pub st_gid: ::gid_t,
+        pub st_rdev: dev_t,
+        pub st_size: off_t,
+        pub st_atime: time_t,
+        pub st_spare1: ::c_long,
+        pub st_mtime: time_t,
+        pub st_spare2: ::c_long,
+        pub st_ctime: time_t,
+        pub st_spare3: ::c_long,
+        pub st_blksize: blksize_t,
+        pub st_blocks: blkcnt_t,
+        pub st_spare4: [::c_long; 2usize],
+    }
+
+    pub struct statvfs {
+        pub f_bsize: ::c_ulong,
+        pub f_frsize: ::c_ulong,
+        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_favail: fsfilcnt_t,
+        pub f_fsid: ::c_ulong,
+        pub f_flag: ::c_ulong,
+        pub f_namemax: ::c_ulong,
+    }
+
+    pub struct sigset_t {
+        __val: [::c_ulong; 16],
+    }
+
+    pub struct sigaction {
+        pub sa_handler: extern fn(arg1: ::c_int),
+        pub sa_mask: sigset_t,
+        pub sa_flags: ::c_int,
+    }
+
+    pub struct dirent {
+        pub d_ino: ino_t,
+        pub d_type: ::c_uchar,
+        pub d_name: [::c_char; 256usize],
+    }
+
+    pub struct stack_t {
+        pub ss_sp: *mut ::c_void,
+        pub ss_flags: ::c_int,
+        pub ss_size: usize,
+    }
+
+    pub struct fd_set { // Unverified
+        fds_bits: [::c_ulong; FD_SETSIZE / ULONG_SIZE],
+    }
+
+    pub struct passwd { // Unverified
+        pub pw_name: *mut ::c_char,
+        pub pw_passwd: *mut ::c_char,
+        pub pw_uid: ::uid_t,
+        pub pw_gid: ::gid_t,
+        pub pw_gecos: *mut ::c_char,
+        pub pw_dir: *mut ::c_char,
+        pub pw_shell: *mut ::c_char,
+    }
+
+    pub struct termios { // Unverified
+        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],
+    }
+
+    pub struct sem_t { // Unverified
+        __size: [::c_char; 16],
+    }
+
+    pub struct Dl_info { // Unverified
+        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 utsname { // Unverified
+        pub sysname: [::c_char; 65],
+        pub nodename: [::c_char; 65],
+        pub release: [::c_char; 65],
+        pub version: [::c_char; 65],
+        pub machine: [::c_char; 65],
+        pub domainname: [::c_char; 65]
+    }
+
+    pub struct cpu_set_t { // Unverified
+        bits: [u32; 32],
+    }
+
+    pub struct pthread_attr_t { // Unverified
+        __size: [u64; 7]
+    }
+
+    pub struct pthread_mutex_t { // Unverified
+        #[cfg(any(target_arch = "mips", target_arch = "arm",
+                  target_arch = "powerpc"))]
+        __align: [::c_long; 0],
+        #[cfg(not(any(target_arch = "mips", target_arch = "arm",
+                      target_arch = "powerpc")))]
+        __align: [::c_longlong; 0],
+        size: [u8; __SIZEOF_PTHREAD_MUTEX_T],
+    }
+
+    pub struct pthread_rwlock_t { // Unverified
+        #[cfg(any(target_arch = "mips", target_arch = "arm",
+                  target_arch = "powerpc"))]
+        __align: [::c_long; 0],
+        #[cfg(not(any(target_arch = "mips", target_arch = "arm",
+                      target_arch = "powerpc")))]
+        __align: [::c_longlong; 0],
+        size: [u8; __SIZEOF_PTHREAD_RWLOCK_T],
+    }
+
+    pub struct pthread_mutexattr_t { // Unverified
+        #[cfg(any(target_arch = "x86_64", target_arch = "powerpc64",
+                  target_arch = "mips64", target_arch = "s390x",
+                  target_arch = "sparc64"))]
+        __align: [::c_int; 0],
+        #[cfg(not(any(target_arch = "x86_64", target_arch = "powerpc64",
+                      target_arch = "mips64", target_arch = "s390x",
+                      target_arch = "sparc64")))]
+        __align: [::c_long; 0],
+        size: [u8; __SIZEOF_PTHREAD_MUTEXATTR_T],
+    }
+
+    pub struct pthread_rwlockattr_t { // Unverified
+        __lockkind: ::c_int,
+        __pshared: ::c_int,
+    }
+
+    pub struct pthread_cond_t { // Unverified
+        __align: [::c_longlong; 0],
+        size: [u8; __SIZEOF_PTHREAD_COND_T],
+    }
+
+    pub struct pthread_condattr_t { // Unverified
+        __align: [::c_int; 0],
+        size: [u8; __SIZEOF_PTHREAD_CONDATTR_T],
+    }
+
+}
+
+// unverified constants
+pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
+    __align: [],
+    size: [0; __SIZEOF_PTHREAD_MUTEX_T],
+};
+pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
+    __align: [],
+    size: [0; __SIZEOF_PTHREAD_COND_T],
+};
+pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
+    __align: [],
+    size: [0; __SIZEOF_PTHREAD_RWLOCK_T],
+};
+pub const NCCS: usize = 32;
+pub const __SIZEOF_PTHREAD_ATTR_T: usize = 56;
+pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
+pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
+pub const __SIZEOF_PTHREAD_COND_T: usize = 48;
+pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
+pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
+pub const __SIZEOF_PTHREAD_BARRIER_T: usize = 32;
+pub const __SIZEOF_PTHREAD_BARRIERATTR_T: usize = 4;
+pub const __PTHREAD_MUTEX_HAVE_PREV: usize = 1;
+pub const __PTHREAD_RWLOCK_INT_FLAGS_SHARED: usize = 1;
+pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
+pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
+pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 2;
+pub const FD_SETSIZE: usize = 1024;
+// intentionally not public, only used for fd_set
+const ULONG_SIZE: usize = 32;
+
+// Other constants
+pub const EPERM: ::c_int = 1;
+pub const ENOENT: ::c_int = 2;
+pub const ESRCH: ::c_int = 3;
+pub const EINTR: ::c_int = 4;
+pub const EIO: ::c_int = 5;
+pub const ENXIO: ::c_int = 6;
+pub const E2BIG: ::c_int = 7;
+pub const ENOEXEC: ::c_int = 8;
+pub const EBADF: ::c_int = 9;
+pub const ECHILD: ::c_int = 10;
+pub const EAGAIN: ::c_int = 11;
+pub const ENOMEM: ::c_int = 12;
+pub const EACCES: ::c_int = 13;
+pub const EFAULT: ::c_int = 14;
+pub const EBUSY: ::c_int = 16;
+pub const EEXIST: ::c_int = 17;
+pub const EXDEV: ::c_int = 18;
+pub const ENODEV: ::c_int = 19;
+pub const ENOTDIR: ::c_int = 20;
+pub const EISDIR: ::c_int = 21;
+pub const EINVAL: ::c_int = 22;
+pub const ENFILE: ::c_int = 23;
+pub const EMFILE: ::c_int = 24;
+pub const ENOTTY: ::c_int = 25;
+pub const ETXTBSY: ::c_int = 26;
+pub const EFBIG: ::c_int = 27;
+pub const ENOSPC: ::c_int = 28;
+pub const ESPIPE: ::c_int = 29;
+pub const EROFS: ::c_int = 30;
+pub const EMLINK: ::c_int = 31;
+pub const EPIPE: ::c_int = 32;
+pub const EDOM: ::c_int = 33;
+pub const ERANGE: ::c_int = 34;
+pub const ENOMSG: ::c_int = 35;
+pub const EIDRM: ::c_int = 36;
+pub const EDEADLK: ::c_int = 45;
+pub const ENOLCK: ::c_int = 46;
+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 ENOLINK: ::c_int = 67;
+pub const EPROTO: ::c_int = 71;
+pub const EMULTIHOP: ::c_int = 74;
+pub const EBADMSG: ::c_int = 77;
+pub const EFTYPE: ::c_int = 79;
+pub const ENOSYS: ::c_int = 88;
+pub const ENOTEMPTY: ::c_int = 90;
+pub const ENAMETOOLONG: ::c_int = 91;
+pub const ELOOP: ::c_int = 92;
+pub const EOPNOTSUPP: ::c_int = 95;
+pub const EPFNOSUPPORT: ::c_int = 96;
+pub const ECONNRESET: ::c_int = 104;
+pub const ENOBUFS: ::c_int = 105;
+pub const EAFNOSUPPORT: ::c_int = 106;
+pub const EPROTOTYPE: ::c_int = 107;
+pub const ENOTSOCK: ::c_int = 108;
+pub const ENOPROTOOPT: ::c_int = 109;
+pub const ECONNREFUSED: ::c_int = 111;
+pub const EADDRINUSE: ::c_int = 112;
+pub const ECONNABORTED: ::c_int = 113;
+pub const ENETUNREACH: ::c_int = 114;
+pub const ENETDOWN: ::c_int = 115;
+pub const ETIMEDOUT: ::c_int = 116;
+pub const EHOSTDOWN: ::c_int = 117;
+pub const EHOSTUNREACH: ::c_int = 118;
+pub const EINPROGRESS: ::c_int = 119;
+pub const EALREADY: ::c_int = 120;
+pub const EDESTADDRREQ: ::c_int = 121;
+pub const EMSGSIZE: ::c_int = 122;
+pub const EPROTONOSUPPORT: ::c_int = 123;
+pub const EADDRNOTAVAIL: ::c_int = 125;
+pub const ENETRESET: ::c_int = 126;
+pub const EISCONN: ::c_int = 127;
+pub const ENOTCONN: ::c_int = 128;
+pub const ETOOMANYREFS: ::c_int = 129;
+pub const EDQUOT: ::c_int = 132;
+pub const ESTALE: ::c_int = 133;
+pub const ENOTSUP: ::c_int = 134;
+pub const EILSEQ: ::c_int = 138;
+pub const EOVERFLOW: ::c_int = 139;
+pub const ECANCELED: ::c_int = 140;
+pub const ENOTRECOVERABLE: ::c_int = 141;
+pub const EOWNERDEAD: ::c_int = 142;
+pub const EWOULDBLOCK: ::c_int = 11;
+
+pub const F_DUPFD: ::c_int = 0;
+pub const F_GETFD: ::c_int = 1;
+pub const F_SETFD: ::c_int = 2;
+pub const F_GETFL: ::c_int = 3;
+pub const F_SETFL: ::c_int = 4;
+pub const F_GETOWN: ::c_int = 5;
+pub const F_SETOWN: ::c_int = 6;
+pub const F_GETLK: ::c_int = 7;
+pub const F_SETLK: ::c_int = 8;
+pub const F_SETLKW: ::c_int = 9;
+pub const F_RGETLK: ::c_int = 10;
+pub const F_RSETLK: ::c_int = 11;
+pub const F_CNVT: ::c_int = 12;
+pub const F_RSETLKW: ::c_int = 13;
+pub const F_DUPFD_CLOEXEC: ::c_int = 14;
+
+pub const O_RDONLY: ::c_int = 0;
+pub const O_WRONLY: ::c_int = 1;
+pub const O_RDWR: ::c_int = 2;
+pub const O_APPEND: ::c_int = 8;
+pub const O_CREAT: ::c_int = 512;
+pub const O_TRUNC: ::c_int = 1024;
+pub const O_EXCL: ::c_int = 2048;
+pub const O_SYNC: ::c_int = 8192;
+pub const O_NONBLOCK: ::c_int = 16384;
+
+pub const O_ACCMODE: ::c_int = 3;
+pub const O_CLOEXEC: ::c_int = 0x80000;
+
+pub const STDIN_FILENO: ::c_int = 0;
+pub const STDOUT_FILENO: ::c_int = 1;
+pub const STDERR_FILENO: ::c_int = 2;
+
+pub const SEEK_SET: ::c_int = 0;
+pub const SEEK_CUR: ::c_int = 1;
+pub const SEEK_END: ::c_int = 2;
+
+pub const FIONBIO: ::c_int = 1;
+
+pub const S_BLKSIZE: ::mode_t = 1024;
+pub const S_IREAD: ::mode_t = 256;
+pub const S_IWRITE: ::mode_t = 128;
+pub const S_IEXEC: ::mode_t = 64;
+pub const S_ENFMT: ::mode_t = 1024;
+pub const S_IFMT: ::mode_t = 61440;
+pub const S_IFDIR: ::mode_t = 16384;
+pub const S_IFCHR: ::mode_t = 8192;
+pub const S_IFBLK: ::mode_t = 24576;
+pub const S_IFREG: ::mode_t = 32768;
+pub const S_IFLNK: ::mode_t = 40960;
+pub const S_IFSOCK: ::mode_t = 49152;
+pub const S_IFIFO: ::mode_t = 4096;
+pub const S_IRUSR: ::mode_t = 256;
+pub const S_IWUSR: ::mode_t = 128;
+pub const S_IXUSR: ::mode_t = 64;
+pub const S_IRGRP: ::mode_t = 32;
+pub const S_IWGRP: ::mode_t = 16;
+pub const S_IXGRP: ::mode_t = 8;
+pub const S_IROTH: ::mode_t = 4;
+pub const S_IWOTH: ::mode_t = 2;
+pub const S_IXOTH: ::mode_t = 1;
+
+pub const SOL_SOCKET: ::c_int = 65535;
+pub const SOL_TCP: ::c_int = 6;
+
+pub const PF_UNSPEC: ::c_int = 0;
+pub const PF_INET: ::c_int = 2;
+pub const PF_INET6: ::c_int = 23;
+
+pub const AF_UNSPEC: ::c_int = 0;
+pub const AF_INET: ::c_int = 2;
+pub const AF_INET6: ::c_int = 23;
+
+pub const SOCK_STREAM: ::c_int = 1;
+pub const SOCK_DGRAM: ::c_int = 2;
+
+pub const MSG_OOB: ::c_int = 1;
+pub const MSG_PEEK: ::c_int = 2;
+pub const MSG_DONTWAIT: ::c_int = 4;
+pub const MSG_DONTROUTE: ::c_int = 0;
+pub const MSG_WAITALL: ::c_int = 0;
+pub const MSG_MORE: ::c_int = 0;
+pub const MSG_NOSIGNAL: ::c_int = 0;
+
+pub const SHUT_RD: ::c_int = 0;
+pub const SHUT_WR: ::c_int = 1;
+pub const SHUT_RDWR: ::c_int = 2;
+
+pub const SO_REUSEADDR: ::c_int = 4;
+pub const SO_LINGER: ::c_int = 128;
+pub const SO_OOBINLINE: ::c_int = 256;
+pub const SO_SNDBUF: ::c_int = 4097;
+pub const SO_RCVBUF: ::c_int = 4098;
+pub const SO_SNDLOWAT: ::c_int = 4099;
+pub const SO_RCVLOWAT: ::c_int = 4100;
+pub const SO_TYPE: ::c_int = 4104;
+pub const SO_ERROR: ::c_int = 4105;
+
+pub const SOCK_CLOEXEC: ::c_int = O_CLOEXEC;
+
+pub const INADDR_LOOPBACK: ::c_int = 2130706433;
+pub const INADDR_ANY: ::c_int = 0;
+pub const INADDR_BROADCAST: ::c_int = 4294967295;
+pub const INADDR_NONE: ::c_int = 4294967295;
+
+pub const INET_ADDRSTRLEN: ::c_int = 16;
+
+pub const IPPROTO_IP: ::c_int = 0;
+pub const IPPROTO_UDP: ::c_int = 17;
+pub const IPPROTO_TCP: ::c_int = 6;
+
+pub const TCP_NODELAY: ::c_int = 8193;
+pub const TCP_MAXSEG: ::c_int = 8194;
+
+pub const IP_TOS: ::c_int = 7;
+pub const IP_TTL: ::c_int = 8;
+pub const IP_MULTICAST_LOOP: ::c_int = 9;
+pub const IP_MULTICAST_TTL: ::c_int = 10;
+pub const IP_ADD_MEMBERSHIP: ::c_int = 11;
+pub const IP_DROP_MEMBERSHIP: ::c_int = 12;
+
+pub const HOST_NOT_FOUND: ::c_int = 1;
+pub const NO_DATA: ::c_int = 2;
+pub const NO_ADDRESS: ::c_int = 2;
+pub const NO_RECOVERY: ::c_int = 3;
+pub const TRY_AGAIN: ::c_int = 4;
+
+pub const AI_PASSIVE: ::c_int = 1;
+pub const AI_CANONNAME: ::c_int = 2;
+pub const AI_NUMERICHOST: ::c_int = 4;
+pub const AI_NUMERICSERV: ::c_int = 0;
+pub const AI_ADDRCONFIG: ::c_int = 0;
+
+pub const NI_MAXHOST: ::c_int = 1025;
+pub const NI_MAXSERV: ::c_int = 32;
+pub const NI_NOFQDN: ::c_int = 1;
+pub const NI_NUMERICHOST: ::c_int = 2;
+pub const NI_NAMEREQD: ::c_int = 4;
+pub const NI_NUMERICSERV: ::c_int = 0;
+pub const NI_DGRAM: ::c_int = 0;
+
+pub const EAI_FAMILY: ::c_int = -303;
+pub const EAI_MEMORY: ::c_int = -304;
+pub const EAI_NONAME: ::c_int = -305;
+pub const EAI_SOCKTYPE: ::c_int = -307;
+
+f! {
+    pub fn FD_CLR(fd: ::c_int, set: *mut fd_set) -> () {
+        let bits = mem::size_of_val(&(*set).fds_bits[0]) * 8;
+        let fd = fd as usize;
+        (*set).fds_bits[fd / bits] &= !(1 << (fd % bits));
+        return
+    }
+
+    pub fn FD_ISSET(fd: ::c_int, set: *mut fd_set) -> bool {
+        let bits = mem::size_of_val(&(*set).fds_bits[0]) * 8;
+        let fd = fd as usize;
+        return ((*set).fds_bits[fd / bits] & (1 << (fd % bits))) != 0
+    }
+
+    pub fn FD_SET(fd: ::c_int, set: *mut fd_set) -> () {
+        let bits = mem::size_of_val(&(*set).fds_bits[0]) * 8;
+        let fd = fd as usize;
+        (*set).fds_bits[fd / bits] |= 1 << (fd % bits);
+        return
+    }
+
+    pub fn FD_ZERO(set: *mut fd_set) -> () {
+        for slot in (*set).fds_bits.iter_mut() {
+            *slot = 0;
+        }
+    }
+}
+
+extern {
+    pub fn bind(fd: ::c_int, addr: *const sockaddr, len: socklen_t) -> ::c_int;
+    pub fn closesocket(sockfd: ::c_int) -> ::c_int;
+    pub fn ioctl(fd: ::c_int, request: ::c_ulong, ...) -> ::c_int;
+    pub fn recvfrom(fd: ::c_int, buf: *mut ::c_void, n: usize, flags: ::c_int,
+                    addr: *mut sockaddr, addr_len: *mut socklen_t) -> isize;
+    pub fn getnameinfo(sa: *const sockaddr, salen: socklen_t,
+                       host: *mut ::c_char, hostlen: socklen_t,
+                       serv: *mut ::c_char, servlen: socklen_t,
+                       flags: ::c_int) -> ::c_int;
+}
+
+cfg_if! {
+    if #[cfg(target_arch = "arm")] {
+        mod arm;
+        pub use self::arm::*;
+    } else {
+        // Only tested on ARM so far. Other platforms might have different
+        // definitions for types and constants.
+        pub use target_arch_not_implemented;
+    }
+}