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/* Copyright 2012-present Facebook, Inc.
* Licensed under the Apache License, Version 2.0 */
#include "watchman.h"
#ifdef __APPLE__
#include <launch.h>
using watchman::FileDescriptor;
/* When running under launchd, we prefer to obtain our listening
* socket from it. We don't strictly need to run this way, but if we didn't,
* when the user runs `watchman shutdown-server` the launchd job is left in
* a waiting state and needs to be explicitly triggered to get it working
* again.
* By having the socket registered in our job description, launchd knows
* that we want to be activated in this way and takes care of it for us.
*
* This is made more fun because Yosemite introduces launch_activate_socket()
* as a shortcut for this flow and deprecated pretty much everything else
* in launch.h. We use the deprecated functions so that we can run on
* older releases.
* */
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
FileDescriptor w_get_listener_socket_from_launchd() {
launch_data_t req, resp, socks;
req = launch_data_new_string(LAUNCH_KEY_CHECKIN);
if (req == NULL) {
w_log(W_LOG_ERR, "unable to create LAUNCH_KEY_CHECKIN\n");
return FileDescriptor();
}
resp = launch_msg(req);
launch_data_free(req);
if (resp == NULL) {
w_log(W_LOG_ERR, "launchd checkin failed %s\n", strerror(errno));
return FileDescriptor();
}
if (launch_data_get_type(resp) == LAUNCH_DATA_ERRNO) {
w_log(W_LOG_ERR, "launchd checkin failed: %s\n",
strerror(launch_data_get_errno(resp)));
launch_data_free(resp);
return FileDescriptor();
}
socks = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_SOCKETS);
if (socks == NULL) {
w_log(W_LOG_ERR, "launchd didn't provide any sockets\n");
launch_data_free(resp);
return FileDescriptor();
}
// the "sock" name here is coupled with the plist in main.c
socks = launch_data_dict_lookup(socks, "sock");
if (socks == NULL) {
w_log(W_LOG_ERR, "launchd: \"sock\" wasn't present in Sockets\n");
launch_data_free(resp);
return FileDescriptor();
}
return FileDescriptor(
launch_data_get_fd(launch_data_array_get_index(socks, 0)));
}
#endif
/* vim:ts=2:sw=2:et:
*/
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