src/system/libroot/os/launch.cpp

   1 /*
   2  * Copyright 2015, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <launch.h>
   8
   9 #include <TokenSpace.h>
  10 #include <util/KMessage.h>
  11
  12
  13 static port_id sLaunchDaemonPort = -1;
  14
  15
  16 port_id
  17 BPrivate::get_launch_daemon_port()
  18 {
  19         if (sLaunchDaemonPort < 0) {
  20                 sLaunchDaemonPort = find_port(B_LAUNCH_DAEMON_PORT_NAME);
  21
  22                 port_info info;
  23                 if (get_port_info(sLaunchDaemonPort, &info) == B_OK
  24                         && info.team == find_thread(NULL)) {
  25                         // Make sure that the launch_daemon doesn't wait on itself
  26                         sLaunchDaemonPort = -1;
  27                         return -1;
  28                 }
  29         }
  30
  31         return sLaunchDaemonPort;
  32 }
  33
  34
  35 status_t
  36 BPrivate::send_request_to_launch_daemon(KMessage& request, KMessage& reply)
  37 {
  38         status_t status = request.SendTo(get_launch_daemon_port(),
  39                 B_PREFERRED_TOKEN, &reply);
  40         if (status != B_OK)
  41                 return status;
  42
  43         return (status_t)reply.What();
  44 }
  45
  46
  47 status_t
  48 BPrivate::get_launch_data(const char* signature, KMessage& data)
  49 {
  50         BPrivate::KMessage request(B_GET_LAUNCH_DATA);
  51         request.AddString("name", signature);
  52
  53         return BPrivate::send_request_to_launch_daemon(request, data);
  54 }