diff --git a/lib/wasix/src/net/socket.rs b/lib/wasix/src/net/socket.rs
index 86a336371b93..df3570b7ce4f 100644
--- a/lib/wasix/src/net/socket.rs
+++ b/lib/wasix/src/net/socket.rs
@@ -1227,6 +1227,7 @@ impl InodeSocket {
                     let mut inner = self.inner.protected.write().unwrap();
                     let res = match &mut inner.kind {
                         InodeSocketKind::Icmp(socket) => socket.try_send_to(self.data, self.addr),
+                        InodeSocketKind::TcpStream { socket, .. } => socket.try_send(self.data),
                         InodeSocketKind::UdpSocket { socket, .. } => {
                             socket.try_send_to(self.data, self.addr)
                         }
diff --git a/tests/c-wasi-tests/sock_send_to.c b/tests/c-wasi-tests/sock_send_to.c
new file mode 100644
index 000000000000..226ff7743543
--- /dev/null
+++ b/tests/c-wasi-tests/sock_send_to.c
@@ -0,0 +1,376 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <wasi/api.h>
+#include <wasi/api_wasix.h>
+
+#ifndef __WASI_SOCK_RECV_INPUT_DONT_WAIT
+#define __WASI_SOCK_RECV_INPUT_DONT_WAIT ((__wasi_riflags_t)(1 << 3))
+#endif
+
+static int failures = 0;
+
+static void expect_errno(const char* name, __wasi_errno_t got,
+                         __wasi_errno_t expect) {
+  if (got != expect) {
+    fprintf(stderr, "%s: expected %u, got %u\n", name, expect, got);
+    failures++;
+  }
+}
+
+static void set_ipv4_addr_port_le(__wasi_addr_port_t* addr, uint16_t port,
+                                  uint8_t a, uint8_t b, uint8_t c, uint8_t d) {
+  memset(addr, 0, sizeof(*addr));
+  addr->tag = __WASI_ADDRESS_FAMILY_INET4;
+  unsigned char* octs = (unsigned char*)&addr->u;
+  octs[0] = (unsigned char)(port & 0xff);
+  octs[1] = (unsigned char)((port >> 8) & 0xff);
+  octs[2] = a;
+  octs[3] = b;
+  octs[4] = c;
+  octs[5] = d;
+}
+
+static uint16_t port_from_addr_be(const __wasi_addr_port_t* addr) {
+  const unsigned char* octs = (const unsigned char*)&addr->u;
+  return (uint16_t)(((uint16_t)octs[0] << 8) | (uint16_t)octs[1]);
+}
+
+static __wasi_errno_t recv_from_retry(__wasi_fd_t fd, __wasi_iovec_t* iov,
+                                      __wasi_size_t iov_len,
+                                      __wasi_riflags_t flags,
+                                      __wasi_size_t* nread,
+                                      __wasi_roflags_t* roflags,
+                                      __wasi_addr_port_t* peer) {
+  for (int i = 0; i < 1000; i++) {
+    __wasi_errno_t err = __wasi_sock_recv_from(
+        fd, iov, iov_len, flags | __WASI_SOCK_RECV_INPUT_DONT_WAIT, nread,
+        roflags, peer);
+    if (err == __WASI_ERRNO_AGAIN) {
+      continue;
+    }
+    return err;
+  }
+  return __WASI_ERRNO_AGAIN;
+}
+
+static __wasi_errno_t send_to_retry(__wasi_fd_t fd, const __wasi_ciovec_t* iov,
+                                    __wasi_size_t iov_len,
+                                    __wasi_siflags_t flags,
+                                    const __wasi_addr_port_t* addr,
+                                    __wasi_size_t* nsent) {
+  for (int i = 0; i < 100; i++) {
+    __wasi_errno_t err =
+        __wasi_sock_send_to(fd, iov, iov_len, flags, addr, nsent);
+    if (err == __WASI_ERRNO_INTR) {
+      continue;
+    }
+    return err;
+  }
+  return __WASI_ERRNO_INTR;
+}
+
+static void open_udp_server(__wasi_fd_t* server_fd, __wasi_addr_port_t* addr) {
+  __wasi_errno_t err = __wasi_sock_open(__WASI_ADDRESS_FAMILY_INET4,
+                                        __WASI_SOCK_TYPE_SOCKET_DGRAM,
+                                        __WASI_SOCK_PROTO_UDP, server_fd);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  __wasi_addr_port_t bind_addr;
+  set_ipv4_addr_port_le(&bind_addr, 0, 127, 0, 0, 1);
+  err = __wasi_sock_bind(*server_fd, &bind_addr);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  err = __wasi_sock_addr_local(*server_fd, addr);
+  assert(err == __WASI_ERRNO_SUCCESS);
+  assert(addr->tag == __WASI_ADDRESS_FAMILY_INET4);
+  assert(port_from_addr_be(addr) != 0);
+}
+
+static void open_udp_client(__wasi_fd_t* client_fd) {
+  __wasi_errno_t err = __wasi_sock_open(__WASI_ADDRESS_FAMILY_INET4,
+                                        __WASI_SOCK_TYPE_SOCKET_DGRAM,
+                                        __WASI_SOCK_PROTO_UDP, client_fd);
+  assert(err == __WASI_ERRNO_SUCCESS);
+}
+
+static void open_connected_tcp(__wasi_fd_t* client_fd, __wasi_fd_t* server_fd,
+                               __wasi_fd_t* accepted_fd,
+                               __wasi_addr_port_t* server_addr) {
+  __wasi_errno_t err = __wasi_sock_open(__WASI_ADDRESS_FAMILY_INET4,
+                                        __WASI_SOCK_TYPE_SOCKET_STREAM,
+                                        __WASI_SOCK_PROTO_TCP, server_fd);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  __wasi_addr_port_t bind_addr;
+  set_ipv4_addr_port_le(&bind_addr, 0, 127, 0, 0, 1);
+  err = __wasi_sock_bind(*server_fd, &bind_addr);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  err = __wasi_sock_listen(*server_fd, 1);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  err = __wasi_sock_addr_local(*server_fd, server_addr);
+  assert(err == __WASI_ERRNO_SUCCESS);
+  assert(server_addr->tag == __WASI_ADDRESS_FAMILY_INET4);
+  uint16_t port = port_from_addr_be(server_addr);
+  assert(port != 0);
+
+  err = __wasi_sock_open(__WASI_ADDRESS_FAMILY_INET4,
+                         __WASI_SOCK_TYPE_SOCKET_STREAM, __WASI_SOCK_PROTO_TCP,
+                         client_fd);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  __wasi_addr_port_t connect_addr;
+  set_ipv4_addr_port_le(&connect_addr, port, 127, 0, 0, 1);
+  err = __wasi_sock_connect(*client_fd, &connect_addr);
+  assert(err == __WASI_ERRNO_SUCCESS);
+
+  __wasi_addr_port_t accepted_addr;
+  err = __wasi_sock_accept_v2(*server_fd, 0, accepted_fd, &accepted_addr);
+  assert(err == __WASI_ERRNO_SUCCESS);
+}
+
+static void recv_exact(__wasi_fd_t fd, void* out, size_t len) {
+  uint8_t* bytes = (uint8_t*)out;
+  size_t offset = 0;
+  while (offset < len) {
+    __wasi_iovec_t iov = {
+        .buf = bytes + offset,
+        .buf_len = len - offset,
+    };
+    __wasi_size_t nread = 0;
+    __wasi_roflags_t roflags = 0;
+    __wasi_errno_t err = __wasi_sock_recv(fd, &iov, 1, 0, &nread, &roflags);
+    assert(err == __WASI_ERRNO_SUCCESS);
+    assert(nread > 0);
+    offset += nread;
+  }
+}
+
+static void test_invalid_fd(void) {
+  printf("Test 1: invalid fd\n");
+  const uint8_t msg[] = "x";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t nsent = 0;
+  __wasi_addr_port_t addr;
+  set_ipv4_addr_port_le(&addr, 1234, 127, 0, 0, 1);
+
+  __wasi_errno_t err = __wasi_sock_send_to(9999, &iov, 1, 0, &addr, &nsent);
+  expect_errno("invalid fd", err, __WASI_ERRNO_BADF);
+}
+
+static void test_not_socket(void) {
+  printf("Test 2: not a socket\n");
+  int fd = open("sock_send_to_file", O_CREAT | O_RDWR, 0644);
+  assert(fd >= 0);
+
+  const uint8_t msg[] = "x";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t nsent = 0;
+  __wasi_addr_port_t addr;
+  set_ipv4_addr_port_le(&addr, 1234, 127, 0, 0, 1);
+
+  __wasi_errno_t err =
+      __wasi_sock_send_to((__wasi_fd_t)fd, &iov, 1, 0, &addr, &nsent);
+  expect_errno("not socket", err, __WASI_ERRNO_NOTSOCK);
+
+  close(fd);
+  assert(unlink("sock_send_to_file") == 0);
+}
+
+static void test_invalid_iovec(void) {
+  printf("Test 3: invalid iovec pointer\n");
+  __wasi_fd_t fd = 0;
+  open_udp_client(&fd);
+
+  __wasi_ciovec_t* bad_iov = (__wasi_ciovec_t*)(uintptr_t)0xFFFFFFFFu;
+  __wasi_size_t nsent = 0;
+  __wasi_addr_port_t addr;
+  set_ipv4_addr_port_le(&addr, 1234, 127, 0, 0, 1);
+
+  __wasi_errno_t err = __wasi_sock_send_to(fd, bad_iov, 1, 0, &addr, &nsent);
+  expect_errno("invalid iovec", err, __WASI_ERRNO_MEMVIOLATION);
+
+  close(fd);
+}
+
+static void test_invalid_buffer(void) {
+  printf("Test 4: invalid buffer\n");
+  __wasi_fd_t fd = 0;
+  open_udp_client(&fd);
+
+  __wasi_ciovec_t iov = {
+      .buf = (const uint8_t*)0xFFFFF000u,
+      .buf_len = 4,
+  };
+  __wasi_size_t nsent = 0;
+  __wasi_addr_port_t addr;
+  set_ipv4_addr_port_le(&addr, 1234, 127, 0, 0, 1);
+
+  __wasi_errno_t err = __wasi_sock_send_to(fd, &iov, 1, 0, &addr, &nsent);
+  expect_errno("invalid buffer", err, __WASI_ERRNO_MEMVIOLATION);
+
+  close(fd);
+}
+
+static void test_invalid_addr(void) {
+  printf("Test 5: invalid addr pointer\n");
+  __wasi_fd_t fd = 0;
+  open_udp_client(&fd);
+
+  const uint8_t msg[] = "x";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t nsent = 0;
+  __wasi_addr_port_t* bad_addr = (__wasi_addr_port_t*)(uintptr_t)0xFFFFFFFFu;
+
+  __wasi_errno_t err = __wasi_sock_send_to(fd, &iov, 1, 0, bad_addr, &nsent);
+  expect_errno("invalid addr", err, __WASI_ERRNO_MEMVIOLATION);
+
+  close(fd);
+}
+
+static void test_invalid_addr_family(void) {
+  printf("Test 6: invalid addr family\n");
+  __wasi_fd_t fd = 0;
+  open_udp_client(&fd);
+
+  const uint8_t msg[] = "x";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t nsent = 0;
+  __wasi_addr_port_t addr;
+  memset(&addr, 0, sizeof(addr));
+  addr.tag = __WASI_ADDRESS_FAMILY_UNIX;
+
+  __wasi_errno_t err = __wasi_sock_send_to(fd, &iov, 1, 0, &addr, &nsent);
+  expect_errno("invalid addr family", err, __WASI_ERRNO_INVAL);
+
+  close(fd);
+}
+
+static void test_basic_sendto(void) {
+  printf("Test 7: UDP sendto + recvfrom\n");
+  __wasi_fd_t server_fd = 0, client_fd = 0;
+  __wasi_addr_port_t server_addr;
+  open_udp_server(&server_fd, &server_addr);
+  open_udp_client(&client_fd);
+
+  __wasi_addr_port_t dest_addr;
+  uint16_t port = port_from_addr_be(&server_addr);
+  set_ipv4_addr_port_le(&dest_addr, port, 127, 0, 0, 1);
+
+  const uint8_t msg[] = "hello";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t nsent = 0;
+
+  __wasi_errno_t err = send_to_retry(client_fd, &iov, 1, 0, &dest_addr, &nsent);
+  assert(err == __WASI_ERRNO_SUCCESS);
+  assert(nsent == sizeof(msg));
+
+  uint8_t buf[8] = {0};
+  __wasi_iovec_t riov = {.buf = buf, .buf_len = sizeof(buf)};
+  __wasi_size_t nread = 0;
+  __wasi_roflags_t roflags = 0;
+  __wasi_addr_port_t peer;
+  err = recv_from_retry(server_fd, &riov, 1, 0, &nread, &roflags, &peer);
+  assert(err == __WASI_ERRNO_SUCCESS);
+  assert(nread == sizeof(msg));
+  assert(memcmp(buf, msg, sizeof(msg)) == 0);
+
+  close(server_fd);
+  close(client_fd);
+}
+
+static void test_udp_message_too_big(void) {
+  printf("Test 8: UDP message too big\n");
+  __wasi_fd_t server_fd = 0, client_fd = 0;
+  __wasi_addr_port_t server_addr;
+  open_udp_server(&server_fd, &server_addr);
+  open_udp_client(&client_fd);
+
+  __wasi_addr_port_t dest_addr;
+  uint16_t port = port_from_addr_be(&server_addr);
+  set_ipv4_addr_port_le(&dest_addr, port, 127, 0, 0, 1);
+
+  static uint8_t bigbuf[128 * 1024];
+  memset(bigbuf, 0x42, sizeof(bigbuf));
+
+  __wasi_ciovec_t iov = {.buf = bigbuf, .buf_len = sizeof(bigbuf)};
+  __wasi_size_t nsent = 0;
+  __wasi_errno_t err = send_to_retry(client_fd, &iov, 1, 0, &dest_addr, &nsent);
+  expect_errno("udp msg too big", err, __WASI_ERRNO_MSGSIZE);
+
+  close(server_fd);
+  close(client_fd);
+}
+
+static void test_invalid_ro_data_len(void) {
+  printf("Test 9: invalid ro_data_len pointer\n");
+  __wasi_fd_t server_fd = 0, client_fd = 0;
+  __wasi_addr_port_t server_addr;
+  open_udp_server(&server_fd, &server_addr);
+  open_udp_client(&client_fd);
+
+  const uint8_t msg[] = "x";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t* bad_len = (__wasi_size_t*)(uintptr_t)0xFFFFFFFFu;
+
+  __wasi_errno_t err =
+      __wasi_sock_send_to(client_fd, &iov, 1, 0, &server_addr, bad_len);
+  expect_errno("invalid ro_data_len", err, __WASI_ERRNO_MEMVIOLATION);
+
+  close(server_fd);
+  close(client_fd);
+}
+
+static void test_connected_tcp_sendto(void) {
+  printf("Test 10: connected TCP sendto behaves like send\n");
+  __wasi_fd_t server_fd = 0, client_fd = 0, accepted_fd = 0;
+  __wasi_addr_port_t server_addr;
+  open_connected_tcp(&client_fd, &server_fd, &accepted_fd, &server_addr);
+
+  const uint8_t msg[] = "hello";
+  __wasi_ciovec_t iov = {.buf = msg, .buf_len = sizeof(msg)};
+  __wasi_size_t nsent = 0;
+
+  __wasi_errno_t err =
+      __wasi_sock_send_to(client_fd, &iov, 1, 0, &server_addr, &nsent);
+  expect_errno("connected tcp sendto", err, __WASI_ERRNO_SUCCESS);
+  if (err == __WASI_ERRNO_SUCCESS) {
+    assert(nsent == sizeof(msg));
+
+    uint8_t buf[sizeof(msg)] = {0};
+    recv_exact(accepted_fd, buf, sizeof(buf));
+    assert(memcmp(buf, msg, sizeof(msg)) == 0);
+  }
+
+  close(accepted_fd);
+  close(server_fd);
+  close(client_fd);
+}
+
+int main(void) {
+  printf("WASIX sock_send_to integration tests\n");
+
+  test_invalid_fd();
+  test_not_socket();
+  test_invalid_iovec();
+  test_invalid_buffer();
+  test_invalid_addr();
+  test_invalid_addr_family();
+  test_basic_sendto();
+  test_udp_message_too_big();
+  test_invalid_ro_data_len();
+  test_connected_tcp_sendto();
+
+  if (failures) {
+    fprintf(stderr, "%d test(s) failed\n", failures);
+    return 1;
+  }
+
+  printf("All tests passed!\n");
+  return 0;
+}