Kernel/LibC/Networking: Be able to send UDP messages

Now it can send UDP messages to a specific IP address and libc has
enough to create a basic UDP ECHO server, that is kinda cool.

1 files changed, 16 insertions, 0 deletions

diff --git a/userland/libc/sys/socket/sendto.c b/userland/libc/sys/socket/sendto.c
new file mode 100644
index 0000000..73437ab
--- /dev/null
+++ b/userland/libc/sys/socket/sendto.c
@@ -0,0 +1,16 @@
+#include <sys/socket.h>
+#include <syscall.h>
+
+struct two_args {
+  uint32_t a;
+  uint32_t b;
+};
+
+size_t sendto(int socket, const void *message, size_t length, int flags,
+               const struct sockaddr *dest_addr, socklen_t dest_len) {
+  struct two_args extra = {
+      .a = dest_addr,
+      .b = dest_len,
+  };
+  return syscall(SYS_SENDTO, socket, message, length, flags, &extra);
+}