diff --git a/unix/linux/types.go b/unix/linux/types.go
index 56eb4c12..c1290869 100644
--- a/unix/linux/types.go
+++ b/unix/linux/types.go
@@ -344,6 +344,7 @@ const (
 	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 fe539a06..5a316acf 100644
--- a/unix/ztypes_linux_386.go
+++ b/unix/ztypes_linux_386.go
@@ -373,6 +373,7 @@ const (
 	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 e99cd797..f6b704e7 100644
--- a/unix/ztypes_linux_amd64.go
+++ b/unix/ztypes_linux_amd64.go
@@ -377,6 +377,7 @@ const (
 	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 0857aa6e..15104b70 100644
--- a/unix/ztypes_linux_arm.go
+++ b/unix/ztypes_linux_arm.go
@@ -377,6 +377,7 @@ const (
 	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 fb1c90a9..cbc46691 100644
--- a/unix/ztypes_linux_arm64.go
+++ b/unix/ztypes_linux_arm64.go
@@ -378,6 +378,7 @@ const (
 	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 d15c9f4a..ef7dd122 100644
--- a/unix/ztypes_linux_mips.go
+++ b/unix/ztypes_linux_mips.go
@@ -376,6 +376,7 @@ const (
 	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 a39d3624..b7e9ffdb 100644
--- a/unix/ztypes_linux_mips64.go
+++ b/unix/ztypes_linux_mips64.go
@@ -378,6 +378,7 @@ const (
 	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 a05f082e..1b24cafe 100644
--- a/unix/ztypes_linux_mips64le.go
+++ b/unix/ztypes_linux_mips64le.go
@@ -378,6 +378,7 @@ const (
 	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 2ecdddcd..d49dfff2 100644
--- a/unix/ztypes_linux_mipsle.go
+++ b/unix/ztypes_linux_mipsle.go
@@ -376,6 +376,7 @@ const (
 	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 33b8e55c..ffe60bf4 100644
--- a/unix/ztypes_linux_ppc64.go
+++ b/unix/ztypes_linux_ppc64.go
@@ -379,6 +379,7 @@ const (
 	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 987d4814..4deb1e8d 100644
--- a/unix/ztypes_linux_ppc64le.go
+++ b/unix/ztypes_linux_ppc64le.go
@@ -379,6 +379,7 @@ const (
 	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 cf539ca9..ba15cd41 100644
--- a/unix/ztypes_linux_s390x.go
+++ b/unix/ztypes_linux_s390x.go
@@ -378,6 +378,7 @@ const (
 	SizeofSockaddrALG       = 0x58
 	SizeofSockaddrVM        = 0x10
 	SizeofLinger            = 0x8
+	SizeofIovec             = 0x10
 	SizeofIPMreq            = 0x8
 	SizeofIPMreqn           = 0xc
 	SizeofIPv6Mreq          = 0x14