Remove extern "C" from internal headers

[lttng-tools.git] / src / common / sessiond-comm / inet.h

diff --git a/src/common/sessiond-comm/inet.h b/src/common/sessiond-comm/inet.h
index 89716b8bafdb0b19cfaa1cca503e34af140711dc..fd7cffedef1c11edb6d615e05b30f855365800cf 100644 (file)
--- a/src/common/sessiond-comm/inet.h
+++ b/src/common/sessiond-comm/inet.h
@@ -1,28 +1,37 @@
 /*
- * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
+ * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #ifndef _LTTCOMM_INET_H
 #define _LTTCOMM_INET_H
 
-#define _GNU_SOURCE
 #include <limits.h>
 
 #include "sessiond-comm.h"
 
+/* See man tcp(7) for more detail about this value. */
+#define LTTCOMM_INET_PROC_SYN_RETRIES_PATH "/proc/sys/net/ipv4/tcp_syn_retries"
+#define LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH "/proc/sys/net/ipv4/tcp_fin_timeout"
+
+/*
+ * The timeout value of a connect() is computed with an algorithm inside the
+ * kernel using the defined TCP SYN retries so the end value in time is
+ * approximative. According to tcp(7) man page, a value of 5 is roughly 180
+ * seconds of timeout. With that information, we've computed a factor of 36
+ * (180/5) by considering that it grows linearly. This is of course uncertain
+ * but this is the best approximation we can do at runtime.
+ */
+#define LTTCOMM_INET_SYN_TIMEOUT_FACTOR                36
+
+/*
+ * Maximum timeout value in seconds of a TCP connection for both send/recv and
+ * connect operations.
+ */
+LTTNG_EXPORT extern unsigned long lttcomm_inet_tcp_timeout;
+
 /* Stub */
 struct lttcomm_sock;
 
@@ -38,7 +47,10 @@ extern int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog);
 
 extern ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
                size_t len, int flags);
-extern ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
-               size_t len, int flags);
+extern ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock,
+               const void *buf, size_t len, int flags);
+
+/* Initialize inet communication layer. */
+extern void lttcomm_inet_init(void);
 
 #endif /* _LTTCOMM_INET_H */