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diff --git a/src/tailer/tailer.c b/src/tailer/tailer.c
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+++ b/src/tailer/tailer.c
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+/**
+ * Copyright (c) 2021, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __COSMOPOLITAN__
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h>
+#endif
+
+#include "sha-256.h"
+#include "tailer.h"
+
+ssize_t send_packet(int fd,
+ tailer_packet_type_t tpt,
+ tailer_packet_payload_type_t payload_type,
+ ...)
+{
+ va_list args;
+ int done = 0;
+
+ va_start(args, payload_type);
+ write(fd, &tpt, sizeof(tpt));
+ do {
+ write(fd, &payload_type, sizeof(payload_type));
+ switch (payload_type) {
+ case TPPT_STRING: {
+ char *str = va_arg(args, char *);
+ uint32_t length = strlen(str);
+
+ write(fd, &length, sizeof(length));
+ write(fd, str, length);
+ break;
+ }
+ case TPPT_HASH: {
+ const char *hash = va_arg(args, const char *);
+
+ write(fd, hash, SHA256_BLOCK_SIZE);
+ break;
+ }
+ case TPPT_INT64: {
+ int64_t i = va_arg(args, int64_t);
+
+ write(fd, &i, sizeof(i));
+ break;
+ }
+ case TPPT_BITS: {
+ int32_t length = va_arg(args, int32_t);
+ const char *bits = va_arg(args, const char *);
+
+ write(fd, &length, sizeof(length));
+ write(fd, bits, length);
+ break;
+ }
+ case TPPT_DONE: {
+ done = 1;
+ break;
+ }
+ default: {
+ assert(0);
+ break;
+ }
+ }
+
+ if (!done) {
+ payload_type = va_arg(args, tailer_packet_payload_type_t);
+ }
+ } while (!done);
+ va_end(args);
+
+ return 0;
+}