1 files changed, 48 insertions, 0 deletions
diff --git a/libc-bottom-half/cloudlibc/src/libc/sys/socket/getsockopt.c b/libc-bottom-half/cloudlibc/src/libc/sys/socket/getsockopt.c
new file mode 100644
index 0000000..1fe41c4
--- /dev/null
+++ b/libc-bottom-half/cloudlibc/src/libc/sys/socket/getsockopt.c
@@ -0,0 +1,48 @@
+// Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/
+//
+// SPDX-License-Identifier: BSD-2-Clause
+
+#include <sys/socket.h>
+
+#include <wasi/api.h>
+#include <errno.h>
+#include <string.h>
+
+int getsockopt(int socket, int level, int option_name,
+               void *restrict option_value, socklen_t *restrict option_len) {
+  // Only support SOL_SOCKET options for now.
+  if (level != SOL_SOCKET) {
+    errno = ENOPROTOOPT;
+    return -1;
+  }
+
+  int value;
+  switch (option_name) {
+    case SO_TYPE: {
+      // Return the type of the socket. This information can simply be
+      // obtained by looking at the file descriptor type.
+      __wasi_fdstat_t fsb;
+      if (__wasi_fd_fdstat_get(socket, &fsb) != 0) {
+        errno = EBADF;
+        return -1;
+      }
+      if (fsb.fs_filetype != __WASI_FILETYPE_SOCKET_DGRAM &&
+          fsb.fs_filetype != __WASI_FILETYPE_SOCKET_STREAM) {
+        errno = ENOTSOCK;
+        return -1;
+      }
+      value = fsb.fs_filetype;
+      break;
+    }
+    default: {
+      errno = ENOPROTOOPT;
+      return -1;
+    }
+  }
+
+  // Copy out integer value.
+  memcpy(option_value, &value,
+         *option_len < sizeof(int) ? *option_len : sizeof(int));
+  *option_len = sizeof(int);
+  return 0;
+}