Merge branch 'master' into translate-c-userland

1 files changed, 159 insertions, 955 deletions

diff --git a/std/os/linux.zig b/std/os/linux.zig
index ecbbf72d42..282aa19bf1 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -1,709 +1,61 @@
+// This file provides the system interface functions for Linux matching those
+// that are provided by libc, whether or not libc is linked. The following
+// abstractions are made:
+// * Work around kernel bugs and limitations. For example, see sendmmsg.
+// * Implement all the syscalls in the same way that libc functions will
+//   provide `rename` when only the `renameat` syscall exists.
+// * Does not support POSIX thread cancellation.
 const std = @import("../std.zig");
-const assert = std.debug.assert;
 const builtin = @import("builtin");
+const assert = std.debug.assert;
 const maxInt = std.math.maxInt;
 const elf = std.elf;
-pub const tls = @import("linux/tls.zig");
 const vdso = @import("linux/vdso.zig");
 const dl = @import("../dynamic_library.zig");
+
+pub const is_the_target = builtin.os == .linux;
 pub use switch (builtin.arch) {
-    builtin.Arch.x86_64 => @import("linux/x86_64.zig"),
-    builtin.Arch.i386 => @import("linux/i386.zig"),
-    builtin.Arch.aarch64 => @import("linux/arm64.zig"),
-    else => @compileError("unsupported arch"),
+    .x86_64 => @import("linux/x86_64.zig"),
+    .aarch64 => @import("linux/arm64.zig"),
+    else => struct {},
 };
-pub use @import("linux/errno.zig");
-
-pub const PATH_MAX = 4096;
-pub const IOV_MAX = 1024;
-
-pub const STDIN_FILENO = 0;
-pub const STDOUT_FILENO = 1;
-pub const STDERR_FILENO = 2;
-
-pub const FUTEX_WAIT = 0;
-pub const FUTEX_WAKE = 1;
-pub const FUTEX_FD = 2;
-pub const FUTEX_REQUEUE = 3;
-pub const FUTEX_CMP_REQUEUE = 4;
-pub const FUTEX_WAKE_OP = 5;
-pub const FUTEX_LOCK_PI = 6;
-pub const FUTEX_UNLOCK_PI = 7;
-pub const FUTEX_TRYLOCK_PI = 8;
-pub const FUTEX_WAIT_BITSET = 9;
-
-pub const FUTEX_PRIVATE_FLAG = 128;
-
-pub const FUTEX_CLOCK_REALTIME = 256;
-
-pub const PROT_NONE = 0;
-pub const PROT_READ = 1;
-pub const PROT_WRITE = 2;
-pub const PROT_EXEC = 4;
-pub const PROT_GROWSDOWN = 0x01000000;
-pub const PROT_GROWSUP = 0x02000000;
-
-pub const MAP_FAILED = maxInt(usize);
-pub const MAP_SHARED = 0x01;
-pub const MAP_PRIVATE = 0x02;
-pub const MAP_TYPE = 0x0f;
-pub const MAP_FIXED = 0x10;
-pub const MAP_ANONYMOUS = 0x20;
-pub const MAP_NORESERVE = 0x4000;
-pub const MAP_GROWSDOWN = 0x0100;
-pub const MAP_DENYWRITE = 0x0800;
-pub const MAP_EXECUTABLE = 0x1000;
-pub const MAP_LOCKED = 0x2000;
-pub const MAP_POPULATE = 0x8000;
-pub const MAP_NONBLOCK = 0x10000;
-pub const MAP_STACK = 0x20000;
-pub const MAP_HUGETLB = 0x40000;
-pub const MAP_FILE = 0;
-
-pub const F_OK = 0;
-pub const X_OK = 1;
-pub const W_OK = 2;
-pub const R_OK = 4;
-
-pub const WNOHANG = 1;
-pub const WUNTRACED = 2;
-pub const WSTOPPED = 2;
-pub const WEXITED = 4;
-pub const WCONTINUED = 8;
-pub const WNOWAIT = 0x1000000;
-
-pub const SA_NOCLDSTOP = 1;
-pub const SA_NOCLDWAIT = 2;
-pub const SA_SIGINFO = 4;
-pub const SA_ONSTACK = 0x08000000;
-pub const SA_RESTART = 0x10000000;
-pub const SA_NODEFER = 0x40000000;
-pub const SA_RESETHAND = 0x80000000;
-pub const SA_RESTORER = 0x04000000;
-
-pub const SIGHUP = 1;
-pub const SIGINT = 2;
-pub const SIGQUIT = 3;
-pub const SIGILL = 4;
-pub const SIGTRAP = 5;
-pub const SIGABRT = 6;
-pub const SIGIOT = SIGABRT;
-pub const SIGBUS = 7;
-pub const SIGFPE = 8;
-pub const SIGKILL = 9;
-pub const SIGUSR1 = 10;
-pub const SIGSEGV = 11;
-pub const SIGUSR2 = 12;
-pub const SIGPIPE = 13;
-pub const SIGALRM = 14;
-pub const SIGTERM = 15;
-pub const SIGSTKFLT = 16;
-pub const SIGCHLD = 17;
-pub const SIGCONT = 18;
-pub const SIGSTOP = 19;
-pub const SIGTSTP = 20;
-pub const SIGTTIN = 21;
-pub const SIGTTOU = 22;
-pub const SIGURG = 23;
-pub const SIGXCPU = 24;
-pub const SIGXFSZ = 25;
-pub const SIGVTALRM = 26;
-pub const SIGPROF = 27;
-pub const SIGWINCH = 28;
-pub const SIGIO = 29;
-pub const SIGPOLL = 29;
-pub const SIGPWR = 30;
-pub const SIGSYS = 31;
-pub const SIGUNUSED = SIGSYS;
-
-pub const O_RDONLY = 0o0;
-pub const O_WRONLY = 0o1;
-pub const O_RDWR = 0o2;
-
-pub const SEEK_SET = 0;
-pub const SEEK_CUR = 1;
-pub const SEEK_END = 2;
-
-pub const SIG_BLOCK = 0;
-pub const SIG_UNBLOCK = 1;
-pub const SIG_SETMASK = 2;
-
-pub const PROTO_ip = 0o000;
-pub const PROTO_icmp = 0o001;
-pub const PROTO_igmp = 0o002;
-pub const PROTO_ggp = 0o003;
-pub const PROTO_ipencap = 0o004;
-pub const PROTO_st = 0o005;
-pub const PROTO_tcp = 0o006;
-pub const PROTO_egp = 0o010;
-pub const PROTO_pup = 0o014;
-pub const PROTO_udp = 0o021;
-pub const PROTO_hmp = 0o024;
-pub const PROTO_xns_idp = 0o026;
-pub const PROTO_rdp = 0o033;
-pub const PROTO_iso_tp4 = 0o035;
-pub const PROTO_xtp = 0o044;
-pub const PROTO_ddp = 0o045;
-pub const PROTO_idpr_cmtp = 0o046;
-pub const PROTO_ipv6 = 0o051;
-pub const PROTO_ipv6_route = 0o053;
-pub const PROTO_ipv6_frag = 0o054;
-pub const PROTO_idrp = 0o055;
-pub const PROTO_rsvp = 0o056;
-pub const PROTO_gre = 0o057;
-pub const PROTO_esp = 0o062;
-pub const PROTO_ah = 0o063;
-pub const PROTO_skip = 0o071;
-pub const PROTO_ipv6_icmp = 0o072;
-pub const PROTO_ipv6_nonxt = 0o073;
-pub const PROTO_ipv6_opts = 0o074;
-pub const PROTO_rspf = 0o111;
-pub const PROTO_vmtp = 0o121;
-pub const PROTO_ospf = 0o131;
-pub const PROTO_ipip = 0o136;
-pub const PROTO_encap = 0o142;
-pub const PROTO_pim = 0o147;
-pub const PROTO_raw = 0o377;
-
-pub const SHUT_RD = 0;
-pub const SHUT_WR = 1;
-pub const SHUT_RDWR = 2;
-
-pub const SOCK_STREAM = 1;
-pub const SOCK_DGRAM = 2;
-pub const SOCK_RAW = 3;
-pub const SOCK_RDM = 4;
-pub const SOCK_SEQPACKET = 5;
-pub const SOCK_DCCP = 6;
-pub const SOCK_PACKET = 10;
-pub const SOCK_CLOEXEC = 0o2000000;
-pub const SOCK_NONBLOCK = 0o4000;
-
-pub const PF_UNSPEC = 0;
-pub const PF_LOCAL = 1;
-pub const PF_UNIX = PF_LOCAL;
-pub const PF_FILE = PF_LOCAL;
-pub const PF_INET = 2;
-pub const PF_AX25 = 3;
-pub const PF_IPX = 4;
-pub const PF_APPLETALK = 5;
-pub const PF_NETROM = 6;
-pub const PF_BRIDGE = 7;
-pub const PF_ATMPVC = 8;
-pub const PF_X25 = 9;
-pub const PF_INET6 = 10;
-pub const PF_ROSE = 11;
-pub const PF_DECnet = 12;
-pub const PF_NETBEUI = 13;
-pub const PF_SECURITY = 14;
-pub const PF_KEY = 15;
-pub const PF_NETLINK = 16;
-pub const PF_ROUTE = PF_NETLINK;
-pub const PF_PACKET = 17;
-pub const PF_ASH = 18;
-pub const PF_ECONET = 19;
-pub const PF_ATMSVC = 20;
-pub const PF_RDS = 21;
-pub const PF_SNA = 22;
-pub const PF_IRDA = 23;
-pub const PF_PPPOX = 24;
-pub const PF_WANPIPE = 25;
-pub const PF_LLC = 26;
-pub const PF_IB = 27;
-pub const PF_MPLS = 28;
-pub const PF_CAN = 29;
-pub const PF_TIPC = 30;
-pub const PF_BLUETOOTH = 31;
-pub const PF_IUCV = 32;
-pub const PF_RXRPC = 33;
-pub const PF_ISDN = 34;
-pub const PF_PHONET = 35;
-pub const PF_IEEE802154 = 36;
-pub const PF_CAIF = 37;
-pub const PF_ALG = 38;
-pub const PF_NFC = 39;
-pub const PF_VSOCK = 40;
-pub const PF_KCM = 41;
-pub const PF_QIPCRTR = 42;
-pub const PF_SMC = 43;
-pub const PF_MAX = 44;
-
-pub const AF_UNSPEC = PF_UNSPEC;
-pub const AF_LOCAL = PF_LOCAL;
-pub const AF_UNIX = AF_LOCAL;
-pub const AF_FILE = AF_LOCAL;
-pub const AF_INET = PF_INET;
-pub const AF_AX25 = PF_AX25;
-pub const AF_IPX = PF_IPX;
-pub const AF_APPLETALK = PF_APPLETALK;
-pub const AF_NETROM = PF_NETROM;
-pub const AF_BRIDGE = PF_BRIDGE;
-pub const AF_ATMPVC = PF_ATMPVC;
-pub const AF_X25 = PF_X25;
-pub const AF_INET6 = PF_INET6;
-pub const AF_ROSE = PF_ROSE;
-pub const AF_DECnet = PF_DECnet;
-pub const AF_NETBEUI = PF_NETBEUI;
-pub const AF_SECURITY = PF_SECURITY;
-pub const AF_KEY = PF_KEY;
-pub const AF_NETLINK = PF_NETLINK;
-pub const AF_ROUTE = PF_ROUTE;
-pub const AF_PACKET = PF_PACKET;
-pub const AF_ASH = PF_ASH;
-pub const AF_ECONET = PF_ECONET;
-pub const AF_ATMSVC = PF_ATMSVC;
-pub const AF_RDS = PF_RDS;
-pub const AF_SNA = PF_SNA;
-pub const AF_IRDA = PF_IRDA;
-pub const AF_PPPOX = PF_PPPOX;
-pub const AF_WANPIPE = PF_WANPIPE;
-pub const AF_LLC = PF_LLC;
-pub const AF_IB = PF_IB;
-pub const AF_MPLS = PF_MPLS;
-pub const AF_CAN = PF_CAN;
-pub const AF_TIPC = PF_TIPC;
-pub const AF_BLUETOOTH = PF_BLUETOOTH;
-pub const AF_IUCV = PF_IUCV;
-pub const AF_RXRPC = PF_RXRPC;
-pub const AF_ISDN = PF_ISDN;
-pub const AF_PHONET = PF_PHONET;
-pub const AF_IEEE802154 = PF_IEEE802154;
-pub const AF_CAIF = PF_CAIF;
-pub const AF_ALG = PF_ALG;
-pub const AF_NFC = PF_NFC;
-pub const AF_VSOCK = PF_VSOCK;
-pub const AF_KCM = PF_KCM;
-pub const AF_QIPCRTR = PF_QIPCRTR;
-pub const AF_SMC = PF_SMC;
-pub const AF_MAX = PF_MAX;
-
-pub const SO_DEBUG = 1;
-pub const SO_REUSEADDR = 2;
-pub const SO_TYPE = 3;
-pub const SO_ERROR = 4;
-pub const SO_DONTROUTE = 5;
-pub const SO_BROADCAST = 6;
-pub const SO_SNDBUF = 7;
-pub const SO_RCVBUF = 8;
-pub const SO_KEEPALIVE = 9;
-pub const SO_OOBINLINE = 10;
-pub const SO_NO_CHECK = 11;
-pub const SO_PRIORITY = 12;
-pub const SO_LINGER = 13;
-pub const SO_BSDCOMPAT = 14;
-pub const SO_REUSEPORT = 15;
-pub const SO_PASSCRED = 16;
-pub const SO_PEERCRED = 17;
-pub const SO_RCVLOWAT = 18;
-pub const SO_SNDLOWAT = 19;
-pub const SO_RCVTIMEO = 20;
-pub const SO_SNDTIMEO = 21;
-pub const SO_ACCEPTCONN = 30;
-pub const SO_SNDBUFFORCE = 32;
-pub const SO_RCVBUFFORCE = 33;
-pub const SO_PROTOCOL = 38;
-pub const SO_DOMAIN = 39;
-
-pub const SO_SECURITY_AUTHENTICATION = 22;
-pub const SO_SECURITY_ENCRYPTION_TRANSPORT = 23;
-pub const SO_SECURITY_ENCRYPTION_NETWORK = 24;
-
-pub const SO_BINDTODEVICE = 25;
-
-pub const SO_ATTACH_FILTER = 26;
-pub const SO_DETACH_FILTER = 27;
-pub const SO_GET_FILTER = SO_ATTACH_FILTER;
-
-pub const SO_PEERNAME = 28;
-pub const SO_TIMESTAMP = 29;
-pub const SCM_TIMESTAMP = SO_TIMESTAMP;
-
-pub const SO_PEERSEC = 31;
-pub const SO_PASSSEC = 34;
-pub const SO_TIMESTAMPNS = 35;
-pub const SCM_TIMESTAMPNS = SO_TIMESTAMPNS;
-pub const SO_MARK = 36;
-pub const SO_TIMESTAMPING = 37;
-pub const SCM_TIMESTAMPING = SO_TIMESTAMPING;
-pub const SO_RXQ_OVFL = 40;
-pub const SO_WIFI_STATUS = 41;
-pub const SCM_WIFI_STATUS = SO_WIFI_STATUS;
-pub const SO_PEEK_OFF = 42;
-pub const SO_NOFCS = 43;
-pub const SO_LOCK_FILTER = 44;
-pub const SO_SELECT_ERR_QUEUE = 45;
-pub const SO_BUSY_POLL = 46;
-pub const SO_MAX_PACING_RATE = 47;
-pub const SO_BPF_EXTENSIONS = 48;
-pub const SO_INCOMING_CPU = 49;
-pub const SO_ATTACH_BPF = 50;
-pub const SO_DETACH_BPF = SO_DETACH_FILTER;
-pub const SO_ATTACH_REUSEPORT_CBPF = 51;
-pub const SO_ATTACH_REUSEPORT_EBPF = 52;
-pub const SO_CNX_ADVICE = 53;
-pub const SCM_TIMESTAMPING_OPT_STATS = 54;
-pub const SO_MEMINFO = 55;
-pub const SO_INCOMING_NAPI_ID = 56;
-pub const SO_COOKIE = 57;
-pub const SCM_TIMESTAMPING_PKTINFO = 58;
-pub const SO_PEERGROUPS = 59;
-pub const SO_ZEROCOPY = 60;
-
-pub const SOL_SOCKET = 1;
-
-pub const SOL_IP = 0;
-pub const SOL_IPV6 = 41;
-pub const SOL_ICMPV6 = 58;
-
-pub const SOL_RAW = 255;
-pub const SOL_DECNET = 261;
-pub const SOL_X25 = 262;
-pub const SOL_PACKET = 263;
-pub const SOL_ATM = 264;
-pub const SOL_AAL = 265;
-pub const SOL_IRDA = 266;
-pub const SOL_NETBEUI = 267;
-pub const SOL_LLC = 268;
-pub const SOL_DCCP = 269;
-pub const SOL_NETLINK = 270;
-pub const SOL_TIPC = 271;
-pub const SOL_RXRPC = 272;
-pub const SOL_PPPOL2TP = 273;
-pub const SOL_BLUETOOTH = 274;
-pub const SOL_PNPIPE = 275;
-pub const SOL_RDS = 276;
-pub const SOL_IUCV = 277;
-pub const SOL_CAIF = 278;
-pub const SOL_ALG = 279;
-pub const SOL_NFC = 280;
-pub const SOL_KCM = 281;
-pub const SOL_TLS = 282;
-
-pub const SOMAXCONN = 128;
-
-pub const MSG_OOB = 0x0001;
-pub const MSG_PEEK = 0x0002;
-pub const MSG_DONTROUTE = 0x0004;
-pub const MSG_CTRUNC = 0x0008;
-pub const MSG_PROXY = 0x0010;
-pub const MSG_TRUNC = 0x0020;
-pub const MSG_DONTWAIT = 0x0040;
-pub const MSG_EOR = 0x0080;
-pub const MSG_WAITALL = 0x0100;
-pub const MSG_FIN = 0x0200;
-pub const MSG_SYN = 0x0400;
-pub const MSG_CONFIRM = 0x0800;
-pub const MSG_RST = 0x1000;
-pub const MSG_ERRQUEUE = 0x2000;
-pub const MSG_NOSIGNAL = 0x4000;
-pub const MSG_MORE = 0x8000;
-pub const MSG_WAITFORONE = 0x10000;
-pub const MSG_BATCH = 0x40000;
-pub const MSG_ZEROCOPY = 0x4000000;
-pub const MSG_FASTOPEN = 0x20000000;
-pub const MSG_CMSG_CLOEXEC = 0x40000000;
-
-pub const DT_UNKNOWN = 0;
-pub const DT_FIFO = 1;
-pub const DT_CHR = 2;
-pub const DT_DIR = 4;
-pub const DT_BLK = 6;
-pub const DT_REG = 8;
-pub const DT_LNK = 10;
-pub const DT_SOCK = 12;
-pub const DT_WHT = 14;
-
-pub const TCGETS = 0x5401;
-pub const TCSETS = 0x5402;
-pub const TCSETSW = 0x5403;
-pub const TCSETSF = 0x5404;
-pub const TCGETA = 0x5405;
-pub const TCSETA = 0x5406;
-pub const TCSETAW = 0x5407;
-pub const TCSETAF = 0x5408;
-pub const TCSBRK = 0x5409;
-pub const TCXONC = 0x540A;
-pub const TCFLSH = 0x540B;
-pub const TIOCEXCL = 0x540C;
-pub const TIOCNXCL = 0x540D;
-pub const TIOCSCTTY = 0x540E;
-pub const TIOCGPGRP = 0x540F;
-pub const TIOCSPGRP = 0x5410;
-pub const TIOCOUTQ = 0x5411;
-pub const TIOCSTI = 0x5412;
-pub const TIOCGWINSZ = 0x5413;
-pub const TIOCSWINSZ = 0x5414;
-pub const TIOCMGET = 0x5415;
-pub const TIOCMBIS = 0x5416;
-pub const TIOCMBIC = 0x5417;
-pub const TIOCMSET = 0x5418;
-pub const TIOCGSOFTCAR = 0x5419;
-pub const TIOCSSOFTCAR = 0x541A;
-pub const FIONREAD = 0x541B;
-pub const TIOCINQ = FIONREAD;
-pub const TIOCLINUX = 0x541C;
-pub const TIOCCONS = 0x541D;
-pub const TIOCGSERIAL = 0x541E;
-pub const TIOCSSERIAL = 0x541F;
-pub const TIOCPKT = 0x5420;
-pub const FIONBIO = 0x5421;
-pub const TIOCNOTTY = 0x5422;
-pub const TIOCSETD = 0x5423;
-pub const TIOCGETD = 0x5424;
-pub const TCSBRKP = 0x5425;
-pub const TIOCSBRK = 0x5427;
-pub const TIOCCBRK = 0x5428;
-pub const TIOCGSID = 0x5429;
-pub const TIOCGRS485 = 0x542E;
-pub const TIOCSRS485 = 0x542F;
-pub const TIOCGPTN = 0x80045430;
-pub const TIOCSPTLCK = 0x40045431;
-pub const TIOCGDEV = 0x80045432;
-pub const TCGETX = 0x5432;
-pub const TCSETX = 0x5433;
-pub const TCSETXF = 0x5434;
-pub const TCSETXW = 0x5435;
-pub const TIOCSIG = 0x40045436;
-pub const TIOCVHANGUP = 0x5437;
-pub const TIOCGPKT = 0x80045438;
-pub const TIOCGPTLCK = 0x80045439;
-pub const TIOCGEXCL = 0x80045440;
-
-pub const EPOLL_CLOEXEC = O_CLOEXEC;
-
-pub const EPOLL_CTL_ADD = 1;
-pub const EPOLL_CTL_DEL = 2;
-pub const EPOLL_CTL_MOD = 3;
-
-pub const EPOLLIN = 0x001;
-pub const EPOLLPRI = 0x002;
-pub const EPOLLOUT = 0x004;
-pub const EPOLLRDNORM = 0x040;
-pub const EPOLLRDBAND = 0x080;
-pub const EPOLLWRNORM = 0x100;
-pub const EPOLLWRBAND = 0x200;
-pub const EPOLLMSG = 0x400;
-pub const EPOLLERR = 0x008;
-pub const EPOLLHUP = 0x010;
-pub const EPOLLRDHUP = 0x2000;
-pub const EPOLLEXCLUSIVE = (u32(1) << 28);
-pub const EPOLLWAKEUP = (u32(1) << 29);
-pub const EPOLLONESHOT = (u32(1) << 30);
-pub const EPOLLET = (u32(1) << 31);
-
-pub const CLOCK_REALTIME = 0;
-pub const CLOCK_MONOTONIC = 1;
-pub const CLOCK_PROCESS_CPUTIME_ID = 2;
-pub const CLOCK_THREAD_CPUTIME_ID = 3;
-pub const CLOCK_MONOTONIC_RAW = 4;
-pub const CLOCK_REALTIME_COARSE = 5;
-pub const CLOCK_MONOTONIC_COARSE = 6;
-pub const CLOCK_BOOTTIME = 7;
-pub const CLOCK_REALTIME_ALARM = 8;
-pub const CLOCK_BOOTTIME_ALARM = 9;
-pub const CLOCK_SGI_CYCLE = 10;
-pub const CLOCK_TAI = 11;
-
-pub const CSIGNAL = 0x000000ff;
-pub const CLONE_VM = 0x00000100;
-pub const CLONE_FS = 0x00000200;
-pub const CLONE_FILES = 0x00000400;
-pub const CLONE_SIGHAND = 0x00000800;
-pub const CLONE_PTRACE = 0x00002000;
-pub const CLONE_VFORK = 0x00004000;
-pub const CLONE_PARENT = 0x00008000;
-pub const CLONE_THREAD = 0x00010000;
-pub const CLONE_NEWNS = 0x00020000;
-pub const CLONE_SYSVSEM = 0x00040000;
-pub const CLONE_SETTLS = 0x00080000;
-pub const CLONE_PARENT_SETTID = 0x00100000;
-pub const CLONE_CHILD_CLEARTID = 0x00200000;
-pub const CLONE_DETACHED = 0x00400000;
-pub const CLONE_UNTRACED = 0x00800000;
-pub const CLONE_CHILD_SETTID = 0x01000000;
-pub const CLONE_NEWCGROUP = 0x02000000;
-pub const CLONE_NEWUTS = 0x04000000;
-pub const CLONE_NEWIPC = 0x08000000;
-pub const CLONE_NEWUSER = 0x10000000;
-pub const CLONE_NEWPID = 0x20000000;
-pub const CLONE_NEWNET = 0x40000000;
-pub const CLONE_IO = 0x80000000;
-
-pub const EFD_SEMAPHORE = 1;
-pub const EFD_CLOEXEC = O_CLOEXEC;
-pub const EFD_NONBLOCK = O_NONBLOCK;
-
-pub const MS_RDONLY = 1;
-pub const MS_NOSUID = 2;
-pub const MS_NODEV = 4;
-pub const MS_NOEXEC = 8;
-pub const MS_SYNCHRONOUS = 16;
-pub const MS_REMOUNT = 32;
-pub const MS_MANDLOCK = 64;
-pub const MS_DIRSYNC = 128;
-pub const MS_NOATIME = 1024;
-pub const MS_NODIRATIME = 2048;
-pub const MS_BIND = 4096;
-pub const MS_MOVE = 8192;
-pub const MS_REC = 16384;
-pub const MS_SILENT = 32768;
-pub const MS_POSIXACL = (1 << 16);
-pub const MS_UNBINDABLE = (1 << 17);
-pub const MS_PRIVATE = (1 << 18);
-pub const MS_SLAVE = (1 << 19);
-pub const MS_SHARED = (1 << 20);
-pub const MS_RELATIME = (1 << 21);
-pub const MS_KERNMOUNT = (1 << 22);
-pub const MS_I_VERSION = (1 << 23);
-pub const MS_STRICTATIME = (1 << 24);
-pub const MS_LAZYTIME = (1 << 25);
-pub const MS_NOREMOTELOCK = (1 << 27);
-pub const MS_NOSEC = (1 << 28);
-pub const MS_BORN = (1 << 29);
-pub const MS_ACTIVE = (1 << 30);
-pub const MS_NOUSER = (1 << 31);
-
-pub const MS_RMT_MASK = (MS_RDONLY | MS_SYNCHRONOUS | MS_MANDLOCK | MS_I_VERSION | MS_LAZYTIME);
-
-pub const MS_MGC_VAL = 0xc0ed0000;
-pub const MS_MGC_MSK = 0xffff0000;
-
-pub const MNT_FORCE = 1;
-pub const MNT_DETACH = 2;
-pub const MNT_EXPIRE = 4;
-pub const UMOUNT_NOFOLLOW = 8;
-
-pub const IN_CLOEXEC = O_CLOEXEC;
-pub const IN_NONBLOCK = O_NONBLOCK;
-
-pub const IN_ACCESS = 0x00000001;
-pub const IN_MODIFY = 0x00000002;
-pub const IN_ATTRIB = 0x00000004;
-pub const IN_CLOSE_WRITE = 0x00000008;
-pub const IN_CLOSE_NOWRITE = 0x00000010;
-pub const IN_CLOSE = IN_CLOSE_WRITE | IN_CLOSE_NOWRITE;
-pub const IN_OPEN = 0x00000020;
-pub const IN_MOVED_FROM = 0x00000040;
-pub const IN_MOVED_TO = 0x00000080;
-pub const IN_MOVE = IN_MOVED_FROM | IN_MOVED_TO;
-pub const IN_CREATE = 0x00000100;
-pub const IN_DELETE = 0x00000200;
-pub const IN_DELETE_SELF = 0x00000400;
-pub const IN_MOVE_SELF = 0x00000800;
-pub const IN_ALL_EVENTS = 0x00000fff;
-
-pub const IN_UNMOUNT = 0x00002000;
-pub const IN_Q_OVERFLOW = 0x00004000;
-pub const IN_IGNORED = 0x00008000;
-
-pub const IN_ONLYDIR = 0x01000000;
-pub const IN_DONT_FOLLOW = 0x02000000;
-pub const IN_EXCL_UNLINK = 0x04000000;
-pub const IN_MASK_ADD = 0x20000000;
-
-pub const IN_ISDIR = 0x40000000;
-pub const IN_ONESHOT = 0x80000000;
-
-pub const S_IFMT = 0o170000;
-
-pub const S_IFDIR = 0o040000;
-pub const S_IFCHR = 0o020000;
-pub const S_IFBLK = 0o060000;
-pub const S_IFREG = 0o100000;
-pub const S_IFIFO = 0o010000;
-pub const S_IFLNK = 0o120000;
-pub const S_IFSOCK = 0o140000;
-
-pub const S_ISUID = 0o4000;
-pub const S_ISGID = 0o2000;
-pub const S_ISVTX = 0o1000;
-pub const S_IRUSR = 0o400;
-pub const S_IWUSR = 0o200;
-pub const S_IXUSR = 0o100;
-pub const S_IRWXU = 0o700;
-pub const S_IRGRP = 0o040;
-pub const S_IWGRP = 0o020;
-pub const S_IXGRP = 0o010;
-pub const S_IRWXG = 0o070;
-pub const S_IROTH = 0o004;
-pub const S_IWOTH = 0o002;
-pub const S_IXOTH = 0o001;
-pub const S_IRWXO = 0o007;
-
-pub fn S_ISREG(m: u32) bool {
-    return m & S_IFMT == S_IFREG;
-}
-
-pub fn S_ISDIR(m: u32) bool {
-    return m & S_IFMT == S_IFDIR;
-}
-
-pub fn S_ISCHR(m: u32) bool {
-    return m & S_IFMT == S_IFCHR;
-}
-
-pub fn S_ISBLK(m: u32) bool {
-    return m & S_IFMT == S_IFBLK;
-}
-
-pub fn S_ISFIFO(m: u32) bool {
-    return m & S_IFMT == S_IFIFO;
-}
-
-pub fn S_ISLNK(m: u32) bool {
-    return m & S_IFMT == S_IFLNK;
-}
-
-pub fn S_ISSOCK(m: u32) bool {
-    return m & S_IFMT == S_IFSOCK;
-}
-
-pub const TFD_NONBLOCK = O_NONBLOCK;
-pub const TFD_CLOEXEC = O_CLOEXEC;
+pub use @import("bits.zig");
+pub const tls = @import("linux/tls.zig");
 
-pub const TFD_TIMER_ABSTIME = 1;
-pub const TFD_TIMER_CANCEL_ON_SET = (1 << 1);
+/// Set by startup code, used by `getauxval`.
+pub var elf_aux_maybe: ?[*]std.elf.Auxv = null;
 
-fn unsigned(s: i32) u32 {
-    return @bitCast(u32, s);
-}
-fn signed(s: u32) i32 {
-    return @bitCast(i32, s);
-}
-pub fn WEXITSTATUS(s: i32) i32 {
-    return signed((unsigned(s) & 0xff00) >> 8);
-}
-pub fn WTERMSIG(s: i32) i32 {
-    return signed(unsigned(s) & 0x7f);
-}
-pub fn WSTOPSIG(s: i32) i32 {
-    return WEXITSTATUS(s);
-}
-pub fn WIFEXITED(s: i32) bool {
-    return WTERMSIG(s) == 0;
-}
-pub fn WIFSTOPPED(s: i32) bool {
-    return @intCast(u16, ((unsigned(s) & 0xffff) *% 0x10001) >> 8) > 0x7f00;
-}
-pub fn WIFSIGNALED(s: i32) bool {
-    return (unsigned(s) & 0xffff) -% 1 < 0xff;
+/// See `std.elf` for the constants.
+pub fn getauxval(index: usize) usize {
+    const auxv = elf_aux_maybe orelse return 0;
+    var i: usize = 0;
+    while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
+        if (auxv[i].a_type == index)
+            return auxv[i].a_un.a_val;
+    }
+    return 0;
 }
 
-pub const winsize = extern struct {
-    ws_row: u16,
-    ws_col: u16,
-    ws_xpixel: u16,
-    ws_ypixel: u16,
-};
-
 /// Get the errno from a syscall return value, or 0 for no error.
-pub fn getErrno(r: usize) usize {
+pub fn getErrno(r: usize) u12 {
     const signed_r = @bitCast(isize, r);
-    return if (signed_r > -4096 and signed_r < 0) @intCast(usize, -signed_r) else 0;
+    return if (signed_r > -4096 and signed_r < 0) @intCast(u12, -signed_r) else 0;
 }
 
 pub fn dup2(old: i32, new: i32) usize {
-    return dup3(old, new, 0);
+    if (@hasDecl(@This(), "SYS_dup2")) {
+        return syscall2(SYS_dup2, @bitCast(usize, isize(old)), @bitCast(usize, isize(new)));
+    } else {
+        if (old == new) {
+            if (std.debug.runtime_safety) {
+                const rc = syscall2(SYS_fcntl, @bitCast(usize, isize(old)), F_GETFD);
+                if (@bitCast(isize, rc) < 0) return rc;
+            }
+            return @intCast(usize, old);
+        } else {
+            return syscall3(SYS_dup3, @bitCast(usize, isize(old)), @bitCast(usize, isize(new)), 0);
+        }
+    }
 }
 
 pub fn dup3(old: i32, new: i32, flags: u32) usize {
@@ -726,7 +78,11 @@ pub fn execve(path: [*]const u8, argv: [*]const ?[*]const u8, envp: [*]const ?[*
 }
 
 pub fn fork() usize {
-    return clone2(SIGCHLD, 0);
+    if (@hasDecl(@This(), "SYS_fork")) {
+        return syscall0(SYS_fork);
+    } else {
+        return syscall2(SYS_clone, SIGCHLD, 0);
+    }
 }
 
 /// This must be inline, and inline call the syscall function, because if the
@@ -750,6 +106,10 @@ pub fn getcwd(buf: [*]u8, size: usize) usize {
     return syscall2(SYS_getcwd, @ptrToInt(buf), size);
 }
 
+pub fn getdents(fd: i32, dirp: [*]u8, count: usize) usize {
+    return syscall3(SYS_getdents, @bitCast(usize, isize(fd)), @ptrToInt(dirp), count);
+}
+
 pub fn getdents64(fd: i32, dirp: [*]u8, count: usize) usize {
     return syscall3(SYS_getdents64, @bitCast(usize, isize(fd)), @ptrToInt(dirp), count);
 }
@@ -766,14 +126,13 @@ pub fn inotify_rm_watch(fd: i32, wd: i32) usize {
     return syscall2(SYS_inotify_rm_watch, @bitCast(usize, isize(fd)), @bitCast(usize, isize(wd)));
 }
 
-pub fn isatty(fd: i32) bool {
-    var wsz: winsize = undefined;
-    return syscall3(SYS_ioctl, @bitCast(usize, isize(fd)), TIOCGWINSZ, @ptrToInt(&wsz)) == 0;
-}
-
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn readlink(noalias path: [*]const u8, noalias buf_ptr: [*]u8, buf_len: usize) usize {
-    return readlinkat(AT_FDCWD, path, buf_ptr, buf_len);
+    if (@hasDecl(@This(), "SYS_readlink")) {
+        return syscall3(SYS_readlink, @ptrToInt(path), @ptrToInt(buf_ptr), buf_len);
+    } else {
+        return syscall4(SYS_readlinkat, AT_FDCWD, @ptrToInt(path), @ptrToInt(buf_ptr), buf_len);
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -783,7 +142,11 @@ pub fn readlinkat(dirfd: i32, noalias path: [*]const u8, noalias buf_ptr: [*]u8,
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn mkdir(path: [*]const u8, mode: u32) usize {
-    return mkdirat(AT_FDCWD, path, mode);
+    if (@hasDecl(@This(), "SYS_mkdir")) {
+        return syscall2(SYS_mkdir, @ptrToInt(path), mode);
+    } else {
+        return syscall3(SYS_mkdirat, AT_FDCWD, @ptrToInt(path), mode);
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -810,12 +173,12 @@ pub fn mmap(address: ?[*]u8, length: usize, prot: usize, flags: u32, fd: i32, of
     return syscall6(SYS_mmap, @ptrToInt(address), length, prot, flags, @bitCast(usize, isize(fd)), @bitCast(usize, offset));
 }
 
-pub fn mprotect(address: usize, length: usize, protection: usize) usize {
-    return syscall3(SYS_mprotect, address, length, protection);
+pub fn mprotect(address: [*]const u8, length: usize, protection: usize) usize {
+    return syscall3(SYS_mprotect, @ptrToInt(address), length, protection);
 }
 
-pub fn munmap(address: usize, length: usize) usize {
-    return syscall2(SYS_munmap, address, length);
+pub fn munmap(address: [*]const u8, length: usize) usize {
+    return syscall2(SYS_munmap, @ptrToInt(address), length);
 }
 
 pub fn read(fd: i32, buf: [*]u8, count: usize) usize {
@@ -840,12 +203,20 @@ pub fn pwritev(fd: i32, iov: [*]const iovec_const, count: usize, offset: u64) us
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn rmdir(path: [*]const u8) usize {
-    return unlinkat(AT_FDCWD, path, AT_REMOVEDIR);
+    if (@hasDecl(@This(), "SYS_rmdir")) {
+        return syscall1(SYS_rmdir, @ptrToInt(path));
+    } else {
+        return syscall3(SYS_unlinkat, AT_FDCWD, @ptrToInt(path), AT_REMOVEDIR);
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn symlink(existing: [*]const u8, new: [*]const u8) usize {
-    return symlinkat(existing, AT_FDCWD, new);
+    if (@hasDecl(@This(), "SYS_symlink")) {
+        return syscall2(SYS_symlink, @ptrToInt(existing), @ptrToInt(new));
+    } else {
+        return syscall3(SYS_symlinkat, @ptrToInt(existing), AT_FDCWD, @ptrToInt(new));
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -860,15 +231,20 @@ pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: usize) usize {
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn access(path: [*]const u8, mode: u32) usize {
-    return faccessat(AT_FDCWD, path, mode);
+    return syscall2(SYS_access, @ptrToInt(path), mode);
 }
 
+// TODO https://github.com/ziglang/zig/issues/265
 pub fn faccessat(dirfd: i32, path: [*]const u8, mode: u32) usize {
     return syscall3(SYS_faccessat, @bitCast(usize, isize(dirfd)), @ptrToInt(path), mode);
 }
 
 pub fn pipe(fd: *[2]i32) usize {
-    return pipe2(fd, 0);
+    if (@hasDecl(@This(), "SYS_pipe")) {
+        return syscall1(SYS_pipe, @ptrToInt(fd));
+    } else {
+        return syscall2(SYS_pipe2, @ptrToInt(fd), 0);
+    }
 }
 
 pub fn pipe2(fd: *[2]i32, flags: u32) usize {
@@ -885,17 +261,51 @@ pub fn pwrite(fd: i32, buf: [*]const u8, count: usize, offset: usize) usize {
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn rename(old: [*]const u8, new: [*]const u8) usize {
-    return renameat2(AT_FDCWD, old, AT_FDCWD, new, 0);
+    if (@hasDecl(@This(), "SYS_rename")) {
+        return syscall2(SYS_rename, @ptrToInt(old), @ptrToInt(new));
+    } else if (@hasDecl(@This(), "SYS_renameat")) {
+        return syscall4(SYS_renameat, AT_FDCWD, @ptrToInt(old), AT_FDCWD, @ptrToInt(new));
+    } else {
+        return syscall5(SYS_renameat2, AT_FDCWD, @ptrToInt(old), AT_FDCWD, @ptrToInt(new), 0);
+    }
+}
+
+pub fn renameat(oldfd: i32, oldpath: [*]const u8, newfd: i32, newpath: [*]const u8) usize {
+    if (@hasDecl(@This(), "SYS_renameat")) {
+        return syscall4(
+            SYS_renameat,
+            @bitCast(usize, isize(oldfd)),
+            @ptrToInt(old),
+            @bitCast(usize, isize(newfd)),
+            @ptrToInt(new),
+        );
+    } else {
+        return syscall5(
+            SYS_renameat2,
+            @bitCast(usize, isize(oldfd)),
+            @ptrToInt(old),
+            @bitCast(usize, isize(newfd)),
+            @ptrToInt(new),
+            0,
+        );
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn renameat2(oldfd: i32, oldpath: [*]const u8, newfd: i32, newpath: [*]const u8, flags: u32) usize {
-    return syscall5(SYS_renameat2, @bitCast(usize, isize(oldfd)), @ptrToInt(oldpath), @bitCast(usize, isize(newfd)), @ptrToInt(newpath), flags);
+    return syscall5(
+        SYS_renameat2,
+        @bitCast(usize, isize(oldfd)),
+        @ptrToInt(oldpath),
+        @bitCast(usize, isize(newfd)),
+        @ptrToInt(newpath),
+        flags,
+    );
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn open(path: [*]const u8, flags: u32, perm: usize) usize {
-    return openat(AT_FDCWD, path, flags, perm);
+    return syscall3(SYS_open, @ptrToInt(path), flags, perm);
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -923,8 +333,21 @@ pub fn close(fd: i32) usize {
     return syscall1(SYS_close, @bitCast(usize, isize(fd)));
 }
 
-pub fn lseek(fd: i32, offset: isize, ref_pos: usize) usize {
-    return syscall3(SYS_lseek, @bitCast(usize, isize(fd)), @bitCast(usize, offset), ref_pos);
+/// Can only be called on 32 bit systems. For 64 bit see `lseek`.
+pub fn llseek(fd: i32, offset: u64, result: ?*u64, whence: usize) usize {
+    return syscall5(
+        SYS__llseek,
+        @bitCast(usize, isize(fd)),
+        @truncate(usize, offset >> 32),
+        @truncate(usize, offset),
+        @ptrToInt(result),
+        whence,
+    );
+}
+
+/// Can only be called on 64 bit systems. For 32 bit see `llseek`.
+pub fn lseek(fd: i32, offset: i64, whence: usize) usize {
+    return syscall3(SYS_lseek, @bitCast(usize, isize(fd)), @bitCast(usize, offset), whence);
 }
 
 pub fn exit(status: i32) noreturn {
@@ -947,7 +370,11 @@ pub fn kill(pid: i32, sig: i32) usize {
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn unlink(path: [*]const u8) usize {
-    return unlinkat(AT_FDCWD, path, 0);
+    if (@hasDecl(@This(), "SYS_unlink")) {
+        return syscall1(SYS_unlink, @ptrToInt(path));
+    } else {
+        return syscall3(SYS_unlinkat, AT_FDCWD, @ptrToInt(path), 0);
+    }
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -955,8 +382,8 @@ pub fn unlinkat(dirfd: i32, path: [*]const u8, flags: u32) usize {
     return syscall3(SYS_unlinkat, @bitCast(usize, isize(dirfd)), @ptrToInt(path), flags);
 }
 
-pub fn waitpid(pid: i32, status: *i32, options: i32) usize {
-    return syscall4(SYS_wait4, @bitCast(usize, isize(pid)), @ptrToInt(status), @bitCast(usize, isize(options)), 0);
+pub fn waitpid(pid: i32, status: *u32, flags: u32) usize {
+    return syscall4(SYS_wait4, @bitCast(usize, isize(pid)), @ptrToInt(status), flags, 0);
 }
 
 var vdso_clock_gettime = @ptrCast(?*const c_void, init_vdso_clock_gettime);
@@ -1113,48 +540,15 @@ pub fn sigaction(sig: u6, noalias act: *const Sigaction, noalias oact: ?*Sigacti
     return 0;
 }
 
-const NSIG = 65;
-const sigset_t = [128 / @sizeOf(usize)]usize;
-const all_mask = []u32{ 0xffffffff, 0xffffffff };
-const app_mask = []u32{ 0xfffffffc, 0x7fffffff };
-
-const k_sigaction = extern struct {
-    handler: extern fn (i32) void,
-    flags: usize,
-    restorer: extern fn () void,
-    mask: [2]u32,
-};
-
-/// Renamed from `sigaction` to `Sigaction` to avoid conflict with the syscall.
-pub const Sigaction = struct {
-    handler: extern fn (i32) void,
-    mask: sigset_t,
-    flags: u32,
-};
-
-pub const SIG_ERR = @intToPtr(extern fn (i32) void, maxInt(usize));
-pub const SIG_DFL = @intToPtr(extern fn (i32) void, 0);
-pub const SIG_IGN = @intToPtr(extern fn (i32) void, 1);
-pub const empty_sigset = []usize{0} ** sigset_t.len;
-
-pub fn raise(sig: i32) usize {
-    var set: sigset_t = undefined;
-    blockAppSignals(&set);
-    const tid = syscall0(SYS_gettid);
-    const ret = syscall2(SYS_tkill, tid, @bitCast(usize, isize(sig)));
-    restoreSignals(&set);
-    return ret;
-}
-
-fn blockAllSignals(set: *sigset_t) void {
+pub fn blockAllSignals(set: *sigset_t) void {
     _ = syscall4(SYS_rt_sigprocmask, SIG_BLOCK, @ptrToInt(&all_mask), @ptrToInt(set), NSIG / 8);
 }
 
-fn blockAppSignals(set: *sigset_t) void {
+pub fn blockAppSignals(set: *sigset_t) void {
     _ = syscall4(SYS_rt_sigprocmask, SIG_BLOCK, @ptrToInt(&app_mask), @ptrToInt(set), NSIG / 8);
 }
 
-fn restoreSignals(set: *sigset_t) void {
+pub fn restoreSignals(set: *sigset_t) void {
     _ = syscall4(SYS_rt_sigprocmask, SIG_SETMASK, @ptrToInt(set), 0, NSIG / 8);
 }
 
@@ -1168,56 +562,6 @@ pub fn sigismember(set: *const sigset_t, sig: u6) bool {
     return ((set.*)[@intCast(usize, s) / usize.bit_count] & (@intCast(usize, 1) << (s & (usize.bit_count - 1)))) != 0;
 }
 
-pub const in_port_t = u16;
-pub const sa_family_t = u16;
-pub const socklen_t = u32;
-
-/// This intentionally only has ip4 and ip6
-pub const sockaddr = extern union {
-    in: sockaddr_in,
-    in6: sockaddr_in6,
-};
-
-pub const sockaddr_in = extern struct {
-    family: sa_family_t,
-    port: in_port_t,
-    addr: u32,
-    zero: [8]u8,
-};
-
-pub const sockaddr_in6 = extern struct {
-    family: sa_family_t,
-    port: in_port_t,
-    flowinfo: u32,
-    addr: [16]u8,
-    scope_id: u32,
-};
-
-pub const sockaddr_un = extern struct {
-    family: sa_family_t,
-    path: [108]u8,
-};
-
-pub const iovec = extern struct {
-    iov_base: [*]u8,
-    iov_len: usize,
-};
-
-pub const iovec_const = extern struct {
-    iov_base: [*]const u8,
-    iov_len: usize,
-};
-
-pub const mmsghdr = extern struct {
-    msg_hdr: msghdr,
-    msg_len: u32,
-};
-
-pub const mmsghdr_const = extern struct {
-    msg_hdr: msghdr_const,
-    msg_len: u32,
-};
-
 pub fn getsockname(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t) usize {
     return syscall3(SYS_getsockname, @bitCast(usize, isize(fd)), @ptrToInt(addr), @ptrToInt(len));
 }
@@ -1328,12 +672,12 @@ pub fn fstat(fd: i32, stat_buf: *Stat) usize {
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn stat(pathname: [*]const u8, statbuf: *Stat) usize {
-    return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT);
+    return syscall2(SYS_stat, @ptrToInt(pathname), @ptrToInt(statbuf));
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
 pub fn lstat(pathname: [*]const u8, statbuf: *Stat) usize {
-    return fstatat(AF_FDCWD, pathname, statbuf, AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT);
+    return syscall2(SYS_lstat, @ptrToInt(pathname), @ptrToInt(statbuf));
 }
 
 // TODO https://github.com/ziglang/zig/issues/265
@@ -1400,30 +744,13 @@ pub fn fremovexattr(fd: usize, name: [*]const u8) usize {
     return syscall2(SYS_fremovexattr, fd, @ptrToInt(name));
 }
 
-pub fn sched_getaffinity(pid: i32, set: []usize) usize {
-    return syscall3(SYS_sched_getaffinity, @bitCast(usize, isize(pid)), set.len * @sizeOf(usize), @ptrToInt(set.ptr));
+pub fn sched_getaffinity(pid: i32, size: usize, set: *cpu_set_t) usize {
+    const rc = syscall3(SYS_sched_getaffinity, @bitCast(usize, isize(pid)), size, @ptrToInt(set));
+    if (@bitCast(isize, rc) < 0) return rc;
+    if (rc < size) @memset(@ptrCast([*]u8, set) + rc, 0, size - rc);
+    return 0;
 }
 
-pub const epoll_data = extern union {
-    ptr: usize,
-    fd: i32,
-    @"u32": u32,
-    @"u64": u64,
-};
-
-// On x86_64 the structure is packed so that it matches the definition of its
-// 32bit counterpart
-pub const epoll_event = if (builtin.arch != .x86_64)
-    extern struct {
-        events: u32,
-        data: epoll_data,
-    }
-else
-    packed struct {
-        events: u32,
-        data: epoll_data,
-    };
-
 pub fn epoll_create() usize {
     return epoll_create1(0);
 }
@@ -1437,7 +764,13 @@ pub fn epoll_ctl(epoll_fd: i32, op: u32, fd: i32, ev: *epoll_event) usize {
 }
 
 pub fn epoll_wait(epoll_fd: i32, events: [*]epoll_event, maxevents: u32, timeout: i32) usize {
-    return epoll_pwait(epoll_fd, events, maxevents, timeout, null);
+    return syscall4(
+        SYS_epoll_wait,
+        @bitCast(usize, isize(epoll_fd)),
+        @ptrToInt(events),
+        maxevents,
+        @bitCast(usize, isize(timeout)),
+    );
 }
 
 pub fn epoll_pwait(epoll_fd: i32, events: [*]epoll_event, maxevents: u32, timeout: i32, sigmask: ?*sigset_t) usize {
@@ -1473,112 +806,6 @@ pub fn timerfd_settime(fd: i32, flags: u32, new_value: *const itimerspec, old_va
     return syscall4(SYS_timerfd_settime, @bitCast(usize, isize(fd)), flags, @ptrToInt(new_value), @ptrToInt(old_value));
 }
 
-pub const _LINUX_CAPABILITY_VERSION_1 = 0x19980330;
-pub const _LINUX_CAPABILITY_U32S_1 = 1;
-
-pub const _LINUX_CAPABILITY_VERSION_2 = 0x20071026;
-pub const _LINUX_CAPABILITY_U32S_2 = 2;
-
-pub const _LINUX_CAPABILITY_VERSION_3 = 0x20080522;
-pub const _LINUX_CAPABILITY_U32S_3 = 2;
-
-pub const VFS_CAP_REVISION_MASK = 0xFF000000;
-pub const VFS_CAP_REVISION_SHIFT = 24;
-pub const VFS_CAP_FLAGS_MASK = ~VFS_CAP_REVISION_MASK;
-pub const VFS_CAP_FLAGS_EFFECTIVE = 0x000001;
-
-pub const VFS_CAP_REVISION_1 = 0x01000000;
-pub const VFS_CAP_U32_1 = 1;
-pub const XATTR_CAPS_SZ_1 = @sizeOf(u32) * (1 + 2 * VFS_CAP_U32_1);
-
-pub const VFS_CAP_REVISION_2 = 0x02000000;
-pub const VFS_CAP_U32_2 = 2;
-pub const XATTR_CAPS_SZ_2 = @sizeOf(u32) * (1 + 2 * VFS_CAP_U32_2);
-
-pub const XATTR_CAPS_SZ = XATTR_CAPS_SZ_2;
-pub const VFS_CAP_U32 = VFS_CAP_U32_2;
-pub const VFS_CAP_REVISION = VFS_CAP_REVISION_2;
-
-pub const vfs_cap_data = extern struct {
-    //all of these are mandated as little endian
-    //when on disk.
-    const Data = struct {
-        permitted: u32,
-        inheritable: u32,
-    };
-
-    magic_etc: u32,
-    data: [VFS_CAP_U32]Data,
-};
-
-pub const CAP_CHOWN = 0;
-pub const CAP_DAC_OVERRIDE = 1;
-pub const CAP_DAC_READ_SEARCH = 2;
-pub const CAP_FOWNER = 3;
-pub const CAP_FSETID = 4;
-pub const CAP_KILL = 5;
-pub const CAP_SETGID = 6;
-pub const CAP_SETUID = 7;
-pub const CAP_SETPCAP = 8;
-pub const CAP_LINUX_IMMUTABLE = 9;
-pub const CAP_NET_BIND_SERVICE = 10;
-pub const CAP_NET_BROADCAST = 11;
-pub const CAP_NET_ADMIN = 12;
-pub const CAP_NET_RAW = 13;
-pub const CAP_IPC_LOCK = 14;
-pub const CAP_IPC_OWNER = 15;
-pub const CAP_SYS_MODULE = 16;
-pub const CAP_SYS_RAWIO = 17;
-pub const CAP_SYS_CHROOT = 18;
-pub const CAP_SYS_PTRACE = 19;
-pub const CAP_SYS_PACCT = 20;
-pub const CAP_SYS_ADMIN = 21;
-pub const CAP_SYS_BOOT = 22;
-pub const CAP_SYS_NICE = 23;
-pub const CAP_SYS_RESOURCE = 24;
-pub const CAP_SYS_TIME = 25;
-pub const CAP_SYS_TTY_CONFIG = 26;
-pub const CAP_MKNOD = 27;
-pub const CAP_LEASE = 28;
-pub const CAP_AUDIT_WRITE = 29;
-pub const CAP_AUDIT_CONTROL = 30;
-pub const CAP_SETFCAP = 31;
-pub const CAP_MAC_OVERRIDE = 32;
-pub const CAP_MAC_ADMIN = 33;
-pub const CAP_SYSLOG = 34;
-pub const CAP_WAKE_ALARM = 35;
-pub const CAP_BLOCK_SUSPEND = 36;
-pub const CAP_AUDIT_READ = 37;
-pub const CAP_LAST_CAP = CAP_AUDIT_READ;
-
-pub fn cap_valid(u8: x) bool {
-    return x >= 0 and x <= CAP_LAST_CAP;
-}
-
-pub fn CAP_TO_MASK(cap: u8) u32 {
-    return u32(1) << u5(cap & 31);
-}
-
-pub fn CAP_TO_INDEX(cap: u8) u8 {
-    return cap >> 5;
-}
-
-pub const cap_t = extern struct {
-    hdrp: *cap_user_header_t,
-    datap: *cap_user_data_t,
-};
-
-pub const cap_user_header_t = extern struct {
-    version: u32,
-    pid: usize,
-};
-
-pub const cap_user_data_t = extern struct {
-    effective: u32,
-    permitted: u32,
-    inheritable: u32,
-};
-
 pub fn unshare(flags: usize) usize {
     return syscall1(SYS_unshare, flags);
 }
@@ -1591,29 +818,6 @@ pub fn capset(hdrp: *cap_user_header_t, datap: *const cap_user_data_t) usize {
     return syscall2(SYS_capset, @ptrToInt(hdrp), @ptrToInt(datap));
 }
 
-pub const inotify_event = extern struct {
-    wd: i32,
-    mask: u32,
-    cookie: u32,
-    len: u32,
-    //name: [?]u8,
-};
-
-pub const dirent64 = extern struct {
-    d_ino: u64,
-    d_off: u64,
-    d_reclen: u16,
-    d_type: u8,
-    d_name: u8, // field address is the address of first byte of name https://github.com/ziglang/zig/issues/173
-};
-
-pub const dl_phdr_info = extern struct {
-    dlpi_addr: usize,
-    dlpi_name: ?[*]const u8,
-    dlpi_phdr: [*]elf.Phdr,
-    dlpi_phnum: u16,
-};
-
 // XXX: This should be weak
 extern const __ehdr_start: elf.Ehdr = undefined;
 
@@ -1671,8 +875,8 @@ pub fn dl_iterate_phdr(comptime T: type, callback: extern fn (info: *dl_phdr_inf
     return last_r;
 }
 
-test "import" {
-    if (builtin.os == builtin.Os.linux) {
+test "" {
+    if (is_the_target) {
         _ = @import("linux/test.zig");
     }
 }