[PATCH v4 18/40] bsd-user: Add FreeBSD socket system calls

Complete os-socket.h with setfib, bindat, connectat, and accept4.

Signed-off-by: Stacey Son <[email protected]>
Assisted-by: Claude Opus 4.6 (1M context)
Reviewed-by: Pierrick Bouvier <[email protected]>
Acked-by: Richard Henderson <[email protected]>
Signed-off-by: Warner Losh <[email protected]>
---
 bsd-user/freebsd/os-socket.h | 83 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/bsd-user/freebsd/os-socket.h b/bsd-user/freebsd/os-socket.h
index 126e49b282..b0f2498ff7 100644
--- a/bsd-user/freebsd/os-socket.h
+++ b/bsd-user/freebsd/os-socket.h
@@ -336,5 +336,88 @@ done:
     return ret;
 }
 
+/* setfib(2) */
+static inline abi_long do_freebsd_setfib(abi_long fib)
+{
+
+    return get_errno(setfib(fib));
+}
+
+/* bindat(2) */
+static inline abi_long do_freebsd_bindat(int fd, int sockfd,
+        abi_ulong target_addr, socklen_t addrlen)
+{
+    abi_long ret;
+    void *addr;
+
+    if ((int)addrlen < 0) {
+        return -TARGET_EINVAL;
+    }
+
+    addr = alloca(addrlen + 1);
+    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+    if (is_error(ret)) {
+        return ret;
+    }
+
+    return get_errno(bindat(fd, sockfd, addr, addrlen));
+}
+
+/* connectat(2) */
+static inline abi_long do_freebsd_connectat(int fd, int sockfd,
+        abi_ulong target_addr, socklen_t addrlen)
+{
+    abi_long ret;
+    void *addr;
+
+    if ((int)addrlen < 0) {
+        return -TARGET_EINVAL;
+    }
+    addr = alloca(addrlen + 1);
+
+    ret = target_to_host_sockaddr(addr, target_addr, addrlen);
+
+    if (is_error(ret)) {
+        return ret;
+    }
+
+    return get_errno(connectat(fd, sockfd, addr, addrlen));
+}
+
+/* accept4(2) */
+static inline abi_long do_freebsd_accept4(int fd, abi_ulong target_addr,
+        abi_ulong target_addrlen_addr, int flags)
+{
+    socklen_t addrlen;
+    void *addr;
+    abi_long ret;
+
+    if (target_addr == 0) {
+        return get_errno(accept(fd, NULL, NULL));
+    }
+    /* return EINVAL if addrlen pointer is invalid */
+    if (get_user_u32(addrlen, target_addrlen_addr)) {
+        return -TARGET_EINVAL;
+    }
+    if ((int)addrlen < 0) {
+        return -TARGET_EINVAL;
+    }
+    if (!access_ok(VERIFY_WRITE, target_addr, addrlen)) {
+        return -TARGET_EINVAL;
+    }
+    addr = alloca(addrlen);
+
+    ret = get_errno(accept4(fd, addr, &addrlen, flags));
+    if (!is_error(ret)) {
+        if (is_error(host_to_target_sockaddr(target_addr, addr, addrlen))) {
+            close(ret);
+            ret = -TARGET_EFAULT;
+        } else if (put_user_u32(addrlen, target_addrlen_addr)) {
+            close(ret);
+            ret = -TARGET_EFAULT;
+        }
+    }
+    return ret;
+}
 
 #endif /* BSD_USER_FREEBSD_OS_SOCKET_H */

-- 
2.55.0