diff --git a/unix/linux/types.go b/unix/linux/types.go
index 56eb4c1..c129086 100644
--- a/unix/linux/types.go
+++ b/unix/linux/types.go
@@ -344,6 +344,7 @@
 	SizeofSockaddrALG       = C.sizeof_struct_sockaddr_alg
 	SizeofSockaddrVM        = C.sizeof_struct_sockaddr_vm
 	SizeofLinger            = C.sizeof_struct_linger
+	SizeofIovec             = C.sizeof_struct_iovec
 	SizeofIPMreq            = C.sizeof_struct_ip_mreq
 	SizeofIPMreqn           = C.sizeof_struct_ip_mreqn
 	SizeofIPv6Mreq          = C.sizeof_struct_ipv6_mreq
diff --git a/unix/ztypes_linux_386.go b/unix/ztypes_linux_386.go
index fe539a0..5a316ac 100644
--- a/unix/ztypes_linux_386.go
+++ b/unix/ztypes_linux_386.go
@@ -373,6 +373,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x8
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_amd64.go b/unix/ztypes_linux_amd64.go
index e99cd79..f6b704e 100644
--- a/unix/ztypes_linux_amd64.go
+++ b/unix/ztypes_linux_amd64.go
@@ -377,6 +377,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_arm.go b/unix/ztypes_linux_arm.go
index 0857aa6..15104b7 100644
--- a/unix/ztypes_linux_arm.go
+++ b/unix/ztypes_linux_arm.go
@@ -377,6 +377,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x8
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_arm64.go b/unix/ztypes_linux_arm64.go
index fb1c90a..cbc4669 100644
--- a/unix/ztypes_linux_arm64.go
+++ b/unix/ztypes_linux_arm64.go
@@ -378,6 +378,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_mips.go b/unix/ztypes_linux_mips.go
index d15c9f4..ef7dd12 100644
--- a/unix/ztypes_linux_mips.go
+++ b/unix/ztypes_linux_mips.go
@@ -376,6 +376,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x8
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_mips64.go b/unix/ztypes_linux_mips64.go
index a39d362..b7e9ffd 100644
--- a/unix/ztypes_linux_mips64.go
+++ b/unix/ztypes_linux_mips64.go
@@ -378,6 +378,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_mips64le.go b/unix/ztypes_linux_mips64le.go
index a05f082..1b24caf 100644
--- a/unix/ztypes_linux_mips64le.go
+++ b/unix/ztypes_linux_mips64le.go
@@ -378,6 +378,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_mipsle.go b/unix/ztypes_linux_mipsle.go
index 2ecdddc..d49dfff 100644
--- a/unix/ztypes_linux_mipsle.go
+++ b/unix/ztypes_linux_mipsle.go
@@ -376,6 +376,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x8
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_ppc64.go b/unix/ztypes_linux_ppc64.go
index 33b8e55..ffe60bf 100644
--- a/unix/ztypes_linux_ppc64.go
+++ b/unix/ztypes_linux_ppc64.go
@@ -379,6 +379,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_ppc64le.go b/unix/ztypes_linux_ppc64le.go
index 987d481..4deb1e8 100644
--- a/unix/ztypes_linux_ppc64le.go
+++ b/unix/ztypes_linux_ppc64le.go
@@ -379,6 +379,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14
diff --git a/unix/ztypes_linux_s390x.go b/unix/ztypes_linux_s390x.go
index cf539ca..ba15cd4 100644
--- a/unix/ztypes_linux_s390x.go
+++ b/unix/ztypes_linux_s390x.go
@@ -378,6 +378,7 @@
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14