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/* Copyright 2015-present Facebook, Inc.
* Licensed under the Apache License, Version 2.0 */
#include "watchman.h"
/* Periodically connect to our endpoint and verify that we're talking
* to ourselves. This is normally a sign of madness, but if we don't
* get an answer, or get a reply from someone else, we know things
* are bad; someone removed our socket file or there was some kind of
* race condition that resulted in multiple instances starting up.
*/
static void check_my_sock() {
auto cmd = json_array({typed_string_to_json("get-pid", W_STRING_UNICODE)});
w_jbuffer_t buf;
json_error_t jerr;
json_int_t remote_pid = 0;
pid_t my_pid = getpid();
w_set_thread_name("sockcheck");
auto client = w_stm_connect(get_sock_name(), 6000);
if (!client) {
w_log(W_LOG_FATAL, "Failed to connect to myself for get-pid check: %s\n",
strerror(errno));
/* NOTREACHED */
}
client->setNonBlock(false);
if (!buf.pduEncodeToStream(is_bser, 0, cmd, client.get())) {
w_log(W_LOG_FATAL, "Failed to send get-pid PDU: %s\n",
strerror(errno));
/* NOTREACHED */
}
buf.clear();
auto result = buf.decodeNext(client.get(), &jerr);
if (!result) {
w_log(W_LOG_FATAL, "Failed to decode get-pid response: %s %s\n",
jerr.text, strerror(errno));
/* NOTREACHED */
}
if (json_unpack_ex(result, &jerr, 0, "{s:i}",
"pid", &remote_pid) != 0) {
w_log(W_LOG_FATAL, "Failed to extract pid from get-pid response: %s\n",
jerr.text);
/* NOTREACHED */
}
if (remote_pid != my_pid) {
w_log(W_LOG_FATAL,
"remote pid from get-pid (%ld) doesn't match my pid (%ld)\n",
(long)remote_pid, (long)my_pid);
/* NOTREACHED */
}
}
void w_check_my_sock(void) {
std::thread thr(check_my_sock);
thr.detach();
}
/* vim:ts=2:sw=2:et:
*/
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