src/common/sessiond-comm/inet.hpp

   1 /*
   2  * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef _LTTCOMM_INET_H
   9 #define _LTTCOMM_INET_H
  10
  11 #include "sessiond-comm.hpp"
  12
  13 #include <lttng/lttng-export.h>
  14
  15 #include <limits.h>
  16 #include <sys/types.h>
  17
  18 /* See man tcp(7) for more detail about this value. */
  19 #define LTTCOMM_INET_PROC_SYN_RETRIES_PATH "/proc/sys/net/ipv4/tcp_syn_retries"
  20 #define LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH "/proc/sys/net/ipv4/tcp_fin_timeout"
  21
  22 /*
  23  * The timeout value of a connect() is computed with an algorithm inside the
  24  * kernel using the defined TCP SYN retries so the end value in time is
  25  * approximative. According to tcp(7) man page, a value of 5 is roughly 180
  26  * seconds of timeout. With that information, we've computed a factor of 36
  27  * (180/5) by considering that it grows linearly. This is of course uncertain
  28  * but this is the best approximation we can do at runtime.
  29  */
  30 #define LTTCOMM_INET_SYN_TIMEOUT_FACTOR 36
  31
  32 /*
  33  * Maximum timeout value in seconds of a TCP connection for both send/recv and
  34  * connect operations.
  35  */
  36 LTTNG_EXPORT extern unsigned long lttcomm_inet_tcp_timeout;
  37
  38 /* Stub */
  39 struct lttcomm_sock;
  40
  41 /* Net family callback */
  42 extern int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type, int proto);
  43
  44 extern struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock);
  45 extern int lttcomm_bind_inet_sock(struct lttcomm_sock *sock);
  46 extern int lttcomm_close_inet_sock(struct lttcomm_sock *sock);
  47 extern int lttcomm_connect_inet_sock(struct lttcomm_sock *sock);
  48 extern int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog);
  49
  50 extern ssize_t
  51 lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf, size_t len, int flags);
  52 extern ssize_t
  53 lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, const void *buf, size_t len, int flags);
  54
  55 /* Initialize inet communication layer. */
  56 extern void lttcomm_inet_init();
  57
  58 #endif /* _LTTCOMM_INET_H */