src/common/sessiond-comm/inet.h

   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 <limits.h>
  12
  13 #include "sessiond-comm.h"
  14
  15 #ifdef __cplusplus
  16 extern "C" {
  17 #endif
  18
  19 /* See man tcp(7) for more detail about this value. */
  20 #define LTTCOMM_INET_PROC_SYN_RETRIES_PATH "/proc/sys/net/ipv4/tcp_syn_retries"
  21 #define LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH "/proc/sys/net/ipv4/tcp_fin_timeout"
  22
  23 /*
  24  * The timeout value of a connect() is computed with an algorithm inside the
  25  * kernel using the defined TCP SYN retries so the end value in time is
  26  * approximative. According to tcp(7) man page, a value of 5 is roughly 180
  27  * seconds of timeout. With that information, we've computed a factor of 36
  28  * (180/5) by considering that it grows linearly. This is of course uncertain
  29  * but this is the best approximation we can do at runtime.
  30  */
  31 #define LTTCOMM_INET_SYN_TIMEOUT_FACTOR         36
  32
  33 /*
  34  * Maximum timeout value in seconds of a TCP connection for both send/recv and
  35  * connect operations.
  36  */
  37 LTTNG_EXPORT extern unsigned long lttcomm_inet_tcp_timeout;
  38
  39 /* Stub */
  40 struct lttcomm_sock;
  41
  42 /* Net family callback */
  43 extern int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type,
  44                 int proto);
  45
  46 extern struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock);
  47 extern int lttcomm_bind_inet_sock(struct lttcomm_sock *sock);
  48 extern int lttcomm_close_inet_sock(struct lttcomm_sock *sock);
  49 extern int lttcomm_connect_inet_sock(struct lttcomm_sock *sock);
  50 extern int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog);
  51
  52 extern ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
  53                 size_t len, int flags);
  54 extern ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock,
  55                 const void *buf, size_t len, int flags);
  56
  57 /* Initialize inet communication layer. */
  58 extern void lttcomm_inet_init(void);
  59
  60 #ifdef __cplusplus
  61 }
  62 #endif
  63
  64 #endif  /* _LTTCOMM_INET_H */