libustcomm/ustcomm.h

   1 /* Copyright (C) 2009  Pierre-Marc Fournier
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 #ifndef USTCOMM_H
  19 #define USTCOMM_H
  20
  21 #include <sys/types.h>
  22 #include <sys/un.h>
  23 #include <urcu/list.h>
  24
  25 #include <ust/kcompat/kcompat.h>
  26 #include "multipoll.h"
  27
  28 #define SOCK_DIR "/tmp/ust-app-socks"
  29 #define UST_SIGNAL SIGIO
  30
  31 struct ustcomm_connection {
  32         struct list_head list;
  33         int fd;
  34         /* Data that has not yet been consumed: */
  35         char *recv_buf;
  36         int recv_buf_size;
  37         int recv_buf_alloc;
  38 };
  39
  40 /* ustcomm_server must be shallow-copyable */
  41 struct ustcomm_server {
  42         /* the "server" socket for serving the external requests */
  43         int listen_fd;
  44         char *socketpath;
  45
  46         struct list_head connections;
  47 };
  48
  49 struct ustcomm_ustd {
  50         struct ustcomm_server server;
  51 };
  52
  53 struct ustcomm_app {
  54         struct ustcomm_server server;
  55 };
  56
  57 /* ustcomm_source must be shallow-copyable */
  58 struct ustcomm_source {
  59         int fd;
  60         void *priv;
  61 };
  62
  63 struct ustcomm_multipoll_conn_info {
  64         struct ustcomm_connection *conn;
  65         int (*cb)(char *msg, struct ustcomm_source *src);
  66 };
  67
  68 //int send_message_pid(pid_t pid, const char *msg, char **reply);
  69 extern int ustcomm_request_consumer(pid_t pid, const char *channel);
  70
  71 extern int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout);
  72 extern int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout);
  73
  74 extern int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle);
  75 extern void ustcomm_fini_app(struct ustcomm_app *handle, int keep_socket_file);
  76 extern void ustcomm_fini_ustd(struct ustcomm_ustd *handle);
  77
  78 extern int ustcomm_init_ustd(struct ustcomm_ustd *handle, const char *sock_path);
  79
  80 extern int ustcomm_connect_app(pid_t pid, struct ustcomm_connection *conn);
  81 extern int ustcomm_close_app(struct ustcomm_connection *conn);
  82 extern int ustcomm_connect_path(const char *path, struct ustcomm_connection *conn, pid_t signalpid);
  83 extern int ustcomm_send_request(struct ustcomm_connection *conn, const char *req, char **reply);
  84 extern int ustcomm_send_reply(struct ustcomm_server *server, char *msg, struct ustcomm_source *src);
  85 extern int ustcomm_disconnect(struct ustcomm_connection *conn);
  86 extern int ustcomm_close_all_connections(struct ustcomm_server *server);
  87 extern void ustcomm_mp_add_app_clients(struct mpentries *ent, struct ustcomm_app *app, int (*cb)(char *recvbuf, struct ustcomm_source *src));
  88
  89 extern int nth_token_is(const char *str, const char *token, int tok_no);
  90
  91 extern char *nth_token(const char *str, int tok_no);
  92
  93 extern int pid_is_online(pid_t);
  94
  95 #endif /* USTCOMM_H */