diff --git a/arch/x64/linux/syscall.S b/arch/x64/linux/syscall.S
index 3d7f0b8..e69bd30 100644
--- a/arch/x64/linux/syscall.S
+++ b/arch/x64/linux/syscall.S
@@ -34,6 +34,18 @@ _D5tanya3sys5linux7syscallQiFNbNilllZl:
 	ret
 
 
+// 3 parameters.
+	.globl _D5tanya3sys5linux7syscallQiFNbNillllZl
+	.type _D5tanya3sys5linux7syscallQiFNbNillllZl, @function
+
+_D5tanya3sys5linux7syscallQiFNbNillllZl:
+	movq %rcx, %rax
+
+	syscall
+
+	ret
+
+
 // 6 parameters.
 	.globl _D5tanya3sys5linux7syscallQiFNbNilllllllZl
 	.type _D5tanya3sys5linux7syscallQiFNbNilllllllZl, @function
diff --git a/source/tanya/sys/linux/syscall.d b/source/tanya/sys/linux/syscall.d
index 64d2cd4..fab77cf 100644
--- a/source/tanya/sys/linux/syscall.d
+++ b/source/tanya/sys/linux/syscall.d
@@ -17,6 +17,9 @@ version (TanyaNative):
 extern ptrdiff_t syscall(ptrdiff_t, ptrdiff_t, ptrdiff_t)
 @nogc nothrow @system;
 
+extern ptrdiff_t syscall(ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t)
+@nogc nothrow @system;
+
 extern ptrdiff_t syscall(ptrdiff_t,
                          ptrdiff_t,
                          ptrdiff_t,
@@ -38,6 +41,10 @@ extern ptrdiff_t syscall_(ptrdiff_t, ptrdiff_t, ptrdiff_t)
 @nogc nothrow pure @system;
 
 pragma(mangle, getOverloadMangling!1)
+extern ptrdiff_t syscall(ptrdiff_t, ptrdiff_t, ptrdiff_t, ptrdiff_t)
+@nogc nothrow pure @system;
+
+pragma(mangle, getOverloadMangling!2)
 extern ptrdiff_t syscall_(ptrdiff_t,
                           ptrdiff_t,
                           ptrdiff_t,
diff --git a/source/tanya/sys/posix/ioctl.d b/source/tanya/sys/posix/ioctl.d
new file mode 100644
index 0000000..abd8f84
--- /dev/null
+++ b/source/tanya/sys/posix/ioctl.d
@@ -0,0 +1,78 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Copyright: Eugene Wissner 2018.
+ * License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
+ *                  Mozilla Public License, v. 2.0).
+ * Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
+ * Source: $(LINK2 https://github.com/caraus-ecms/tanya/blob/master/source/tanya/sys/posix/ioctl.d,
+ *                 tanya/sys/posix/ioctl.d)
+ */
+module tanya.sys.posix.ioctl;
+
+version (TanyaNative):
+
+enum
+{
+    SIOCADDRT = 0x890B, // Add routing table entry.
+    SIOCDELRT = 0x890C, // Delete routing table entry.
+    SIOCRTMSG = 0x890D, // Call to routing system.
+
+    SIOCGIFNAME = 0x8910, // Get iface name.
+    SIOCSIFLINK = 0x8911, // Set iface channel.
+    SIOCGIFCONF = 0x8912, // Get iface list.
+    SIOCGIFFLAGS = 0x8913, // Get flags.
+    SIOCSIFFLAGS = 0x8914, // Set flags.
+    SIOCGIFADDR = 0x8915, // Get PA address.
+    SIOCSIFADDR = 0x8916, // Set PA address.
+    SIOCGIFDSTADDR = 0x8917, // Get remote PA address.
+    SIOCSIFDSTADDR = 0x8918, // Set remote PA address.
+    SIOCGIFBRDADDR = 0x8919, // Get broadcast PA address.
+    SIOCSIFBRDADDR = 0x891a, // Set broadcast PA address.
+    SIOCGIFNETMASK = 0x891b, // Get network PA mask.
+    SIOCSIFNETMASK = 0x891c, // Set network PA mask.
+    SIOCGIFMETRIC = 0x891d, // Get metric.
+    SIOCSIFMETRIC = 0x891e, // Set metric.
+    SIOCGIFMEM = 0x891f, // Get memory address (BSD).
+    SIOCSIFMEM = 0x8920, // Set memory address (BSD).
+    SIOCGIFMTU = 0x8921, // Get MTU size.
+    SIOCSIFMTU = 0x8922, // Set MTU size.
+    SIOCSIFNAME = 0x8923, // Set interface name.
+    SIOCSIFHWADDR = 0x8924, // Set hardware address.
+    SIOCGIFENCAP = 0x8925, // Get/set encapsulations.
+    SIOCSIFENCAP = 0x8926,
+    SIOCGIFHWADDR = 0x8927, // Get hardware address.
+    SIOCGIFSLAVE = 0x8929, // Driver slaving support.
+    SIOCSIFSLAVE = 0x8930,
+    SIOCADDMULTI = 0x8931, // Multicast address lists.
+    SIOCDELMULTI = 0x8932,
+    SIOCGIFINDEX = 0x8933, // Name -> if_index mapping.
+    SIOGIFINDEX = SIOCGIFINDEX, // Misprint compatibility.
+    SIOCSIFPFLAGS = 0x8934, // Set/get extended flags set.
+    SIOCGIFPFLAGS = 0x8935,
+    SIOCDIFADDR = 0x8936, // Delete PA address.
+    SIOCSIFHWBROADCAST = 0x8937, // Set hardware broadcast address.
+    SIOCGIFCOUNT = 0x8938, // Get number of devices.
+
+    SIOCGIFBR = 0x8940, // Bridging support.
+    SIOCSIFBR = 0x8941, // Set bridging options.
+
+    SIOCGIFTXQLEN = 0x8942, // Get the tx queue length.
+    SIOCSIFTXQLEN = 0x8943, // Set the tx queue length.
+
+    SIOCDARP = 0x8953, // Delete ARP table entry.
+    SIOCGARP = 0x8954, // Get ARP table entry.
+    SIOCSARP = 0x8955, // Set ARP table entry.
+
+    SIOCDRARP = 0x8960, // Delete RARP table entry.
+    SIOCGRARP = 0x8961, // Get RARP table entry.
+    SIOCSRARP = 0x8962, // Set RARP table entry.
+
+    SIOCGIFMAP = 0x8970, // Get device parameters.
+    SIOCSIFMAP = 0x8971, // Set device parameters.
+
+    SIOCADDDLCI = 0x8980, // Create new DLCI device.
+    SIOCDELDLCI = 0x8981, // Delete DLCI device.
+}
diff --git a/source/tanya/sys/posix/net/if_.d b/source/tanya/sys/posix/net/if_.d
new file mode 100644
index 0000000..e72cc04
--- /dev/null
+++ b/source/tanya/sys/posix/net/if_.d
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Copyright: Eugene Wissner 2018.
+ * License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
+ *                  Mozilla Public License, v. 2.0).
+ * Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
+ * Source: $(LINK2 https://github.com/caraus-ecms/tanya/blob/master/source/tanya/sys/posix/net/if_.d,
+ *                 tanya/sys/posix/net/if_.d)
+ */
+module tanya.sys.posix.net.if_;
+
+version (TanyaNative):
+
+enum size_t IF_NAMESIZE = 16;
+
+struct ifreq
+{
+    char[IF_NAMESIZE] ifr_name;
+
+    union
+    {
+        int ifr_ifindex;
+    }
+}
diff --git a/source/tanya/sys/posix/socket.d b/source/tanya/sys/posix/socket.d
new file mode 100644
index 0000000..9708f04
--- /dev/null
+++ b/source/tanya/sys/posix/socket.d
@@ -0,0 +1,152 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * Copyright: Eugene Wissner 2018.
+ * License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
+ *                  Mozilla Public License, v. 2.0).
+ * Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
+ * Source: $(LINK2 https://github.com/caraus-ecms/tanya/blob/master/source/tanya/sys/posix/socket.d,
+ *                 tanya/sys/posix/socket.d)
+ */
+module tanya.sys.posix.socket;
+
+version (TanyaNative):
+
+/*
+ * Protocol families.
+ */
+enum
+{
+    PF_UNSPEC = 0, // Unspecified.
+    PF_LOCAL = 1, // Local to host (pipes and file-domain).
+    PF_UNIX = PF_LOCAL, // POSIX name for PF_LOCAL.
+    PF_FILE = PF_LOCAL, // Another non-standard name for PF_LOCAL.
+    PF_INET = 2, // IP protocol family.
+    PF_AX25 = 3, // Amateur Radio AX.25.
+    PF_IPX = 4, // Novell Internet Protocol.
+    PF_APPLETALK = 5, // Appletalk DDP.
+    PF_NETROM = 6, // Amateur radio NetROM.
+    PF_BRIDGE = 7, // Multiprotocol bridge.
+    PF_ATMPVC = 8, // ATM PVCs.
+    PF_X25 = 9, // Reserved for X.25 project.
+    PF_INET6 = 10, // IP version 6.
+    PF_ROSE = 11, // Amateur Radio X.25 PLP.
+    PF_DECnet = 12, // Reserved for DECnet project.
+    PF_NETBEUI = 13, // Reserved for 802.2LLC project.
+    PF_SECURITY = 14, // Security callback pseudo AF.
+    PF_KEY = 15, // PF_KEY key management API.
+    PF_NETLINK = 16, // Kernel user interface device.
+    PF_ROUTE = PF_NETLINK, // Alias to emulate 4.4BSD.
+    PF_PACKET = 17, // Packet family.
+    PF_ASH = 18, // Ash.
+    PF_ECONET = 19, // Acorn Econet.
+    PF_ATMSVC = 20, // ATM SVCs.
+    PF_RDS = 21, // RDS sockets.
+    PF_SNA = 22, // Linux SNA Project.
+    PF_IRDA = 23, // IRDA sockets.
+    PF_PPPOX = 24, // PPPoX sockets.
+    PF_WANPIPE = 25, // Wanpipe API sockets.
+    PF_LLC = 26, // Linux LLC.
+    PF_IB = 27, // Native InfiniBand address.
+    PF_MPLS = 28, // MPLS.
+    PF_CAN = 29, // Controller Area Network.
+    PF_TIPC = 30, // TIPC sockets.
+    PF_BLUETOOTH = 31, // Bluetooth sockets.
+    PF_IUCV = 32, // IUCV sockets.
+    PF_RXRPC = 33, // RxRPC sockets.
+    PF_ISDN = 34, // mISDN sockets.
+    PF_PHONET = 35, // Phonet sockets.
+    PF_IEEE802154 = 36, // IEEE 802.15.4 sockets.
+    PF_CAIF = 37, // CAIF sockets.
+    PF_ALG = 38, // Algorithm sockets.
+    PF_NFC = 39, // NFC sockets.
+    PF_VSOCK = 40, // vSockets.
+    PF_MAX = 41, // For now.
+}
+
+/*
+ * Address families.
+ */
+enum
+{
+    AF_UNSPEC = PF_UNSPEC,
+    AF_LOCAL = PF_LOCAL,
+    AF_UNIX = PF_UNIX,
+    AF_FILE = PF_FILE,
+    AF_INET = PF_INET,
+    AF_AX25 = PF_AX25,
+    AF_IPX = PF_IPX,
+    AF_APPLETALK = PF_APPLETALK,
+    AF_NETROM = PF_NETROM,
+    AF_BRIDGE = PF_BRIDGE,
+    AF_ATMPVC = PF_ATMPVC,
+    AF_X25 = PF_X25,
+    AF_INET6 = PF_INET6,
+    AF_ROSE = PF_ROSE,
+    AF_DECnet = PF_DECnet,
+    AF_NETBEUI = PF_NETBEUI,
+    AF_SECURITY = PF_SECURITY,
+    AF_KEY = PF_KEY,
+    AF_NETLINK = PF_NETLINK,
+    AF_ROUTE = PF_ROUTE,
+    AF_PACKET = PF_PACKET,
+    AF_ASH = PF_ASH,
+    AF_ECONET = PF_ECONET,
+    AF_ATMSVC = PF_ATMSVC,
+    AF_RDS = PF_RDS,
+    AF_SNA = PF_SNA,
+    AF_IRDA = PF_IRDA,
+    AF_PPPOX = PF_PPPOX,
+    AF_WANPIPE = PF_WANPIPE,
+    AF_LLC = PF_LLC,
+    AF_IB = PF_IB,
+    AF_MPLS = PF_MPLS,
+    AF_CAN = PF_CAN,
+    AF_TIPC = PF_TIPC,
+    AF_BLUETOOTH = PF_BLUETOOTH,
+    AF_IUCV = PF_IUCV,
+    AF_RXRPC = PF_RXRPC,
+    AF_ISDN = PF_ISDN,
+    AF_PHONET = PF_PHONET,
+    AF_IEEE802154 = PF_IEEE802154,
+    AF_CAIF = PF_CAIF,
+    AF_ALG = PF_ALG,
+    AF_NFC = PF_NFC,
+    AF_VSOCK = PF_VSOCK,
+    AF_MAX = PF_MAX,
+}
+
+/*
+ * Types of sockets.
+ */
+enum
+{
+    // Sequenced, reliable, connection-based byte streams.
+    SOCK_STREAM = 1,
+    // Connectionless, unreliable datagrams of fixed maximum length.
+    SOCK_DGRAM = 2,
+    // Raw protocol interface.
+    SOCK_RAW = 3,
+    // Reliably-delivered messages.
+    SOCK_RDM = 4,
+    // Sequenced, reliable, connection-based, datagrams of fixed maximum
+    // length.
+    SOCK_SEQPACKET = 5,
+    // Datagram Congestion Control Protocol.
+    SOCK_DCCP = 6,
+    // Linux specific way of getting packets at the dev level. For writing rarp
+    // and other similar things on the user level.
+    SOCK_PACKET = 10,
+}
+
+/*
+ * Flags to be ORed into the type parameter of socket and socketpair and used
+ * for the flags parameter of paccept.
+ */
+enum
+{
+    SOCK_CLOEXEC = 0x80000, // Atomically set close-on-exec flag for the new descriptor(s).
+    SOCK_NONBLOCK = 0x800, // Atomically mark descriptor(s) as non-blocking.
+}