Kernel/Networking/LibC: Add syscalls and libc functions for UDP

This allows a UDP server to be created in userland and read data.
Currently it can't send data and is very very simplistic.

Code is horrible and probably needs some fixing until it can be further built
upon.

2 files changed, 19 insertions, 0 deletions

diff --git a/scalls/recvfrom.c b/scalls/recvfrom.c
new file mode 100644
index 0000000..0e37153
--- /dev/null
+++ b/scalls/recvfrom.c
@@ -0,0 +1,15 @@
+#include <fs/vfs.h>
+#include <poll.h>
+#include <scalls/recvfrom.h>
+
+size_t syscall_recvfrom(int socket, void *buffer, size_t length, int flags,
+                        struct sockaddr *address, socklen_t *address_len) {
+  if (flags & MSG_WAITALL) {
+    struct pollfd fds[1];
+    fds[0].fd = socket;
+    fds[0].events = POLLIN;
+    poll(fds, 1, 0);
+  }
+  kprintf("got event\n");
+  return vfs_pread(socket, buffer, length, 0);
+}
diff --git a/scalls/recvfrom.h b/scalls/recvfrom.h
new file mode 100644
index 0000000..9897899
--- /dev/null
+++ b/scalls/recvfrom.h
@@ -0,0 +1,4 @@
+#include <socket.h>
+
+size_t syscall_recvfrom(int socket, void *buffer, size_t length, int flags,
+                         struct sockaddr *address, socklen_t *address_len);